:root {
  --ak-sidebar: #222e3c;
  --ak-sidebar-dark: #1b2531;
  --ak-sidebar-link: rgba(233, 236, 239, .72);
  --ak-sidebar-active: #f8f9fa;
  --ak-primary: #3b7ddd;
  --ak-body: #f5f7fb;
  --ak-card: #fff;
  --ak-border: #dee2e6;
  --ak-heading: #495057;
  --ak-text: #6c757d;
  --ak-success: #1cbb8c;
  --ak-warning: #fcb92c;
  --ak-danger: #dc3545;
  --ak-radius: .25rem;
  --ak-shadow: 0 0 .875rem 0 rgba(33, 37, 41, .05);
}

* { box-sizing: border-box; }

html,
body {
  min-height: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  font-size: .875rem;
  color: var(--ak-text);
  background: var(--ak-body);
  background-image:
    radial-gradient(ellipse at 10% 0, rgba(59,130,246,.04) 0%, transparent 50%),
    radial-gradient(ellipse at 90% 100%, rgba(16,185,129,.04) 0%, transparent 50%);
}

a { text-decoration: none; }
p { color: var(--ak-text); line-height: 1.6; }
h1, h2, h3, h4, h5 { color: var(--ak-heading); font-weight: 600; letter-spacing: -.02em; }

/* AdminKit shell */
.wrapper,
.portal-shell {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  background: var(--ak-body);
  overflow-x: hidden;
}

.sidebar,
.portal-sidebar {
  width: 260px;
  min-width: 260px;
  max-width: 260px;
  flex: 0 0 260px;
  min-height: 100vh;
  color: var(--ak-sidebar-link);
  background: linear-gradient(180deg, var(--ak-sidebar), var(--ak-sidebar-dark));
  box-shadow: 0 0 2rem 0 rgba(33, 37, 41, .1);
}

.sidebar-content {
  min-height: 100vh;
  background: inherit;
}

.sidebar-brand,
.brand-line {
  min-height: 70px;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1.15rem 1.35rem;
  color: #fff;
}

.sidebar-brand:hover,
.brand-line:hover { color: #fff; }
.sidebar-brand img,
.brand-icon img { width: 34px; height: 34px; object-fit: contain; border-radius: .25rem; background: #fff; }
.sidebar-brand span { color: #fff; font-size: 1.05rem; font-weight: 600; }
.brand-copy strong { display: block; color: #fff; font-size: 1.05rem; font-weight: 600; line-height: 1.1; }
.brand-copy small { display: block; color: rgba(255,255,255,.55); font-size: .7rem; font-weight: 500; }

.sidebar-nav,
.portal-nav {
  display: flex;
  flex-direction: column;
  padding: .75rem 0 1.25rem;
}

.sidebar-header,
.nav-section {
  padding: 1.5rem 1.5rem .375rem;
  color: #ced4da;
  font-size: .6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.sidebar-link,
.portal-nav a {
  position: relative;
  display: flex;
  align-items: center;
  gap: .75rem;
  min-height: 44px;
  padding: .625rem 1.5rem;
  color: var(--ak-sidebar-link);
  font-weight: 400;
  border-left: 3px solid transparent;
}

.sidebar-link i,
.portal-nav a i { width: 20px; color: rgba(233,236,239,.55); font-size: 1.15rem; }
.sidebar-link:hover,
.portal-nav a:hover { color: #e9ecef; background: rgba(255,255,255,.04); }
.sidebar-item.active > .sidebar-link,
.portal-nav a.active { color: var(--ak-sidebar-active); background: linear-gradient(90deg, rgba(59,125,221,.16), transparent); border-left-color: var(--ak-primary); }
.sidebar-item.active > .sidebar-link i,
.portal-nav a.active i { color: var(--ak-primary); }

.sidebar-nav { list-style: none; margin: 0; }
.sidebar-item { margin: 0; }

.main,
.portal-main {
  flex: 1;
  min-width: 0;
  width: calc(100% - 260px);
  max-width: calc(100% - 260px);
  display: flex;
  flex-direction: column;
  padding: 0;
  background: var(--ak-body);
}

.navbar-bg,
.portal-topbar {
  min-height: 70px;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .875rem 1.5rem;
  background: #fff;
  border-bottom: 0 solid transparent;
  box-shadow: var(--ak-shadow);
}

.js-sidebar-toggle,
.sidebar-toggle {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #495057;
  border: 0;
  border-radius: .25rem;
  background: transparent;
  font-size: 1.35rem;
}

.js-sidebar-toggle:hover,
.sidebar-toggle:hover { background: #f5f7fb; }

.navbar-title { min-width: 0; flex: 1; }
.navbar-title strong { display: block; color: #495057; font-size: 1rem; font-weight: 600; line-height: 1.2; }
.navbar-title span { display: block; color: #6c757d; font-size: .8125rem; }
.navbar-align { margin-left: auto; display: flex; align-items: center; gap: .5rem; }
.navbar-collapse { flex: 1; }
.content { flex: 1; width: 100%; padding: 1.5rem; }
.container-fluid { width: 100%; }

.wrapper.sidebar-collapsed .sidebar { display: none; }
.wrapper.sidebar-collapsed .main { width: 100%; max-width: 100%; }

.portal-title { min-width: 0; flex: 1; }
.portal-title h1 { margin: 0; color: #495057; font-size: 1.35rem; font-weight: 600; }
.portal-title p { margin: .125rem 0 0; color: #6c757d; font-size: .8125rem; }
.portal-actions { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.portal-user { color: #495057; font-size: .8125rem; font-weight: 500; display: inline-flex; align-items: center; gap: .35rem; }

.portal-main > .stat-grid,
.portal-main > .dashboard-grid,
.portal-main > .filter-bar,
.portal-main > .table-panel,
.portal-main > .premium-panel,
.portal-main > .admin-material-grid,
.portal-main > .message-list-panel,
.portal-main > .flash,
.portal-main > .d-flex {
  margin-left: 1.5rem;
  margin-right: 1.5rem;
}

.portal-main > .stat-grid:first-of-type,
.portal-main > .filter-bar:first-of-type,
.portal-main > .premium-panel:first-of-type,
.portal-main > .message-list-panel:first-of-type {
  margin-top: 1.5rem;
}

/* Bootstrap-like components */
.btn {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  border-radius: .2rem;
  font-size: .8125rem;
  font-weight: 500;
}

.btn-primary,
.btn-royal { color: #fff; background: var(--ak-primary); border-color: var(--ak-primary); box-shadow: none; }
.btn-primary:hover,
.btn-royal:hover { color: #fff; background: #326abc; border-color: #2f64b1; }

.btn-success { color: #fff; background: #1cbb8c; border-color: #1cbb8c; }
.btn-success:hover { color: #fff; background: #17a37a; border-color: #14916d; }

.btn-danger { color: #fff; background: #dc3545; border-color: #dc3545; }
.btn-danger:hover { color: #fff; background: #c82333; border-color: #bd2130; }

.btn-warning { color: #fff; background: #fcb92c; border-color: #fcb92c; }
.btn-warning:hover { color: #fff; background: #f0a91a; border-color: #e89f14; }

.btn-info { color: #fff; background: #17a2b8; border-color: #17a2b8; }
.btn-info:hover { color: #fff; background: #138496; border-color: #117a8b; }

.btn-outline,
.btn-outline-secondary { color: #495057; background: #fff; border-color: #ced4da; }
.btn-outline:hover,
.btn-outline-secondary:hover { color: #495057; background: #f8f9fa; border-color: #adb5bd; }
.btn-light { color: #495057; background: #f8f9fa; border-color: #f8f9fa; }

label,
.form-label { color: #495057; font-size: .8125rem; font-weight: 500; margin-bottom: .35rem; }

input, select, textarea,
.form-control,
.form-select {
  min-height: 38px;
  color: #495057;
  border: 1px solid #ced4da;
  border-radius: .2rem;
  background-color: #fff;
  font-size: .875rem;
  box-shadow: none;
}

textarea.form-control { min-height: 96px; }
select[multiple] { min-height: 130px; }
input:focus, select:focus, textarea:focus,
.form-control:focus,
.form-select:focus { border-color: #9dbff2; box-shadow: 0 0 0 .2rem rgba(59,125,221,.25); }

.flash {
  padding: .75rem 1rem;
  margin-bottom: 1rem;
  border-radius: .2rem;
  font-weight: 500;
}
.flash.success { color: #0f5132; background: #d1e7dd; border: 1px solid #badbcc; }
.flash.error { color: #842029; background: #f8d7da; border: 1px solid #f5c2c7; }

.stat-grid,
.student-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.5rem; margin-bottom: 1.5rem; }
.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr); gap: 1.5rem; margin-bottom: 1.5rem; }

.stat-card,
.premium-panel,
.table-panel,
.admin-material-card,
.message-list-panel,
.student-card,
.course-panel,
.material-card,
.doubt-card,
.member-form,
.student-email-card,
.notice-item,
.member-status-card,
.member-learning-strip > div {
  background: var(--ak-card);
  border: 0;
  border-radius: var(--ak-radius);
  box-shadow: var(--ak-shadow);
}

.stat-card { padding: 1.25rem; min-height: 132px; }
.stat-card span { display: block; color: #6c757d; font-size: .8125rem; }
.stat-card strong { display: block; margin: .5rem 0 .25rem; color: #495057; font-size: 1.9rem; font-weight: 600; }
.premium-panel { padding: 1.25rem; }

.royal-hero { min-height: 260px; color: #495057; background: #fff; }
.royal-hero h2 { color: #495057; font-family: inherit; font-size: 2rem; font-weight: 600; }
.royal-hero p { color: #6c757d; }
.metric-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1rem; }
.metric-strip div { padding: 1rem; border-radius: .2rem; background: #f8f9fa; }
.metric-strip strong { display: block; color: #495057; font-size: 1.25rem; }
.metric-strip span { color: #6c757d; font-size: .8125rem; }

.progress-premium { height: .65rem; overflow: hidden; border-radius: .2rem; background: #e9ecef; }
.progress-premium span { display: block; height: 100%; background: var(--ak-primary); }

.filter-bar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 220px auto auto;
  gap: 1rem;
  align-items: end;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  background: #fff;
  border-radius: var(--ak-radius);
  box-shadow: var(--ak-shadow);
}

.table-panel { max-width: 100%; overflow: auto; margin-bottom: 1.5rem; }
.table { min-width: 920px; margin-bottom: 0; color: #495057; }
.table thead th { color: #495057; background: #fff; border-bottom: 1px solid #dee2e6; font-size: .75rem; font-weight: 600; text-transform: uppercase; }
.table td { color: #495057; font-size: .875rem; vertical-align: middle; padding: .9rem .75rem; }
.table small { color: #6c757d; }
.table tbody tr:hover { background: #f8f9fa; }

.badge { border-radius: .2rem; padding: .35em .55em; font-size: .7rem; font-weight: 600; }
.badge-new, .badge-open, .badge-frozen { color: #664d03; background: #fff3cd; }
.badge-accepted, .badge-active, .badge-resolved { color: #0f5132; background: #d1e7dd; }
.badge-rejected, .badge-blocked, .badge-breached { color: #842029; background: #f8d7da; }
.badge-archived, .badge-closed { color: #41464b; background: #e2e3e5; }
.badge-completed, .badge-in_progress { color: #084298; background: #cfe2ff; }
.badge-waiting_student { color: #432874; background: #e2d9f3; }

.action-menu { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .5rem; }
.empty-state { color: #6c757d; padding: 1.5rem; text-align: center; }
.avatar-premium { width: 42px; height: 42px; object-fit: cover; border-radius: .2rem; border: 1px solid #dee2e6; }

.activity-list { display: grid; gap: .75rem; }
.activity-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem 0; border-bottom: 1px solid #f1f3f5; }
.activity-row:last-child { border-bottom: 0; }
.activity-row strong { display: block; color: #495057; }
.activity-row span:not(.badge) { color: #6c757d; font-size: .8125rem; }

.inline-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.inline-form-grid .span-2 { grid-column: 1 / -1; }

.choice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.choice-tile { margin: 0; cursor: pointer; }
.choice-tile input { position: absolute; opacity: 0; pointer-events: none; }
.choice-tile span { min-height: 42px; display: flex; align-items: center; gap: .5rem; padding: .55rem .75rem; border: 1px solid #dee2e6; border-radius: .2rem; color: #495057; background: #fff; }
.choice-tile input:checked + span { color: #fff; background: var(--ak-primary); border-color: var(--ak-primary); }

/* Modern course tags */
.s-course-grid { display:flex; flex-wrap:wrap; gap:.45rem; }
.s-course-tag { margin:0; cursor:pointer; }
.s-course-tag input { position:absolute; opacity:0; pointer-events:none; }
.s-course-tag span {
  display:inline-flex; align-items:center; gap:.35rem;
  padding:.3rem .7rem; border-radius:999px;
  font-size:.75rem; font-weight:500; white-space:nowrap;
  border:1.5px solid #e2e8f0; background:#fff; color:#475569;
  transition:all .15s ease;
}
.s-course-tag input:checked + span {
  background:#eef2ff; border-color:#6366f1; color:#4338ca; font-weight:600;
  box-shadow:0 0 0 1px rgba(99,102,241,.2);
}
.s-course-tag:hover span { border-color:#c7d2fe; background:#f8faff; }

/* Course pill selection */
.course-pill { margin:0; cursor:pointer; }
.course-pill input { position:absolute; opacity:0; pointer-events:none; }
.course-pill span {
  display:inline-flex; align-items:center;
  padding:.2rem .55rem; border-radius:999px;
  font-size:.7rem; font-weight:500;
  border:1.5px solid #e2e8f0; background:#fff; color:#475569;
  transition:all .12s ease; line-height:1.6;
}
.course-pill input:checked + span {
  background:#eef2ff; border-color:#6366f1; color:#4338ca; font-weight:600;
}
.course-pill:hover span { border-color:#a5b4fc; }

/* Rich text editor */
.editor-tb { background:#fff; border-bottom:1px solid #e2e8f0; }
.editor-tb-row { display:flex; flex-wrap:wrap; align-items:center; gap:3px; padding:4px 6px; border-bottom:1px solid #f1f5f9; }
.editor-tb-row:last-child { border-bottom:0; }
.editor-btn {
  width:30px; height:28px; display:inline-flex; align-items:center; justify-content:center;
  border:1px solid transparent; background:#f8fafc; border-radius:5px; cursor:pointer;
  font-size:.75rem; color:#374151; transition:all .12s;
}
.editor-btn:hover { background:#eef2ff; border-color:#c7d2fe; color:#4338ca; }
.editor-btn-danger { color:#ef4444; }
.editor-btn-danger:hover { background:#fef2f2; border-color:#fecaca; color:#dc2626; }
.editor-div { width:1px; height:20px; background:#e2e8f0; margin:0 4px; flex-shrink:0; }
.editor-sel {
  height:28px; font-size:.72rem; border:1px solid #e2e8f0; border-radius:5px;
  background:#f8fafc; color:#374151; padding:0 6px; cursor:pointer; outline:none;
}
.editor-sel:hover { border-color:#c7d2fe; }
.editor-clr { width:22px; height:22px; padding:0; border:1px solid #e2e8f0; border-radius:4px; cursor:pointer; background:#fff; }
.editor-clr-lbl { font-size:.68rem; color:#6b7280; cursor:pointer; margin-right:6px; font-weight:500; }
.editor-clr-lbl:hover { color:#374151; }

.switch-toggle { display: inline-flex; align-items: center; gap: .6rem; cursor: pointer; }
.switch-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.switch-toggle > span { position: relative; width: 44px; height: 24px; border-radius: 999px; background: #ced4da; }
.switch-toggle > span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 18px; height: 18px; border-radius: 999px; background: #fff; transition: .15s ease; }
.switch-toggle input:checked + span { background: var(--ak-primary); }
.switch-toggle input:checked + span::after { transform: translateX(20px); }
.switch-toggle strong { color: #495057; font-size: .875rem; }

.toggle-button { min-height: 32px; display: inline-flex; align-items: center; gap: .4rem; padding: .35rem .6rem; border: 1px solid #ced4da; border-radius: .2rem; background: #fff; color: #495057; font-size: .8125rem; }
.toggle-button > span { width: 10px; height: 10px; border-radius: 50%; background: #adb5bd; }
.toggle-button.is-on { color: #0f5132; background: #d1e7dd; border-color: #badbcc; }
.toggle-button.is-on > span { background: var(--ak-success); }

.admin-material-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; margin-bottom: 1.5rem; }
.admin-material-card { padding: 1.25rem; }
.admin-material-card h3 { margin: .75rem 0 .35rem; font-size: 1.05rem; }
.material-type, .material-deadline, .course-panel > span { display: inline-flex; padding: .3rem .5rem; border-radius: .2rem; color: #084298; background: #cfe2ff; font-size: .7rem; font-weight: 600; }
.compact-meta { display: grid; gap: .5rem; margin: 1rem 0; }
.compact-meta div { display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: .75rem; padding-top: .5rem; border-top: 1px solid #f1f3f5; }
.compact-meta dt { color: #6c757d; font-size: .75rem; font-weight: 600; text-transform: uppercase; }
.compact-meta dd { margin: 0; color: #495057; }

.message-list-panel { display: grid; gap: 1rem; padding: 1rem; margin-bottom: 1.5rem; }
.email-row { display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 1rem; padding: 1rem; border-bottom: 1px solid #f1f3f5; }
.email-row:last-child { border-bottom: 0; }
.email-avatar { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--ak-primary); font-weight: 600; }
.email-status-dot { width: 10px; height: 10px; margin: 1rem; border-radius: 50%; background: #adb5bd; }
.email-status-dot.is-active { background: var(--ak-success); }
.email-row-head { display: flex; justify-content: space-between; gap: 1rem; }
.email-row-head h3 { margin: 0; font-size: 1rem; }
.email-row-head span, .email-meta span { color: #6c757d; font-size: .8125rem; }
.email-meta { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0; }
.email-message { padding: .75rem; border-radius: .2rem; background: #f8f9fa; }
.email-message.from-me { background: #e7f1ff; }
.email-message strong { color: #495057; }
.email-message small { color: #6c757d; }
.email-message p { color: #495057; margin: .35rem 0 0; }
.reply-form { display: grid; gap: .75rem; }

/* Student portal in AdminKit style */
.student-welcome { min-height: 100vh; padding: 0; background: var(--ak-body); }
.student-shell { width: min(100%, 1320px); margin: 0 auto; padding: 1.5rem; }
.student-header { min-height: 70px; display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin: -1.5rem -1.5rem 1.5rem; padding: .875rem 1.5rem; background: #fff; box-shadow: var(--ak-shadow); }
.student-header .auth-brand { color: #495057; }
.student-header .auth-brand img { width: 34px; height: 34px; border-radius: .2rem; background: #fff; }
.student-header .auth-brand strong { color: #495057; }
.student-header .text-white-50 { color: #6c757d !important; }
.student-nav { display: flex; flex-wrap: wrap; gap: .35rem; }
.student-nav a { padding: .5rem .65rem; color: #6c757d; border-radius: .2rem; }
.student-nav a.active, .student-nav a:hover { color: var(--ak-primary); background: #e7f1ff; }
.student-hero { padding: 0; color: #495057; background: transparent; box-shadow: none; }
.student-hero h1 { color: #495057; font-family: inherit; font-size: 1.75rem; font-weight: 600; }
.student-hero .text-white-50, .student-profile-strip .text-white-50 { color: #6c757d !important; }
.student-profile-strip { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.student-profile-strip img { width: 64px; height: 64px; object-fit: cover; border-radius: .2rem; border: 1px solid #dee2e6; background: #fff; }
.member-kicker { color: var(--ak-primary); font-size: .75rem; font-weight: 600; text-transform: uppercase; }
.member-command-grid { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 1.5rem; margin-bottom: 1.5rem; }
.course-panel, .member-form, .student-email-card, .material-card, .doubt-card { padding: 1.25rem; }
.member-course-suite { min-height: 220px; display: flex; flex-direction: column; justify-content: space-between; }
.member-course-suite h2 { color: #495057; font-family: inherit; font-size: 1.5rem; font-weight: 600; }
.member-course-suite p, .student-card p, .notice-item p, .material-card p, .doubt-card p { color: #6c757d; }
.member-status-card { min-height: 220px; display: flex; flex-direction: column; justify-content: flex-end; padding: 1.25rem; }
.member-status-card strong, .student-card h3, .notice-item strong, .material-card h3, .doubt-card h3 { color: #495057; }
.member-status-card span, .member-status-card p, .student-card > span, .notice-item small, .member-learning-strip span { color: #6c757d; }
.member-learning-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; margin-bottom: 1.5rem; }
.member-learning-strip > div { display: grid; grid-template-columns: 38px minmax(0, 1fr); gap: .25rem .75rem; padding: 1rem; }
.member-learning-strip i { grid-row: span 2; width: 38px; height: 38px; display: grid; place-items: center; color: var(--ak-primary); background: #e7f1ff; border-radius: .2rem; }
.member-learning-strip strong { color: #495057; }
.student-card { padding: 1.25rem; }
.student-card i { color: var(--ak-primary); font-size: 1.45rem; }
.member-dashboard-feed { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
.notice-panel { display: grid; gap: .75rem; }
.notice-heading { display: flex; justify-content: space-between; color: #495057; font-weight: 600; }
.notice-heading i { color: var(--ak-primary); }
.notice-item { padding: 1rem; }
.material-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
.material-section { margin-top: 1.5rem; }
.section-title-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.section-title-row h2 { color: #495057; font-size: 1.2rem; margin: 0; }
.section-title-row > span { min-width: 30px; height: 30px; display: grid; place-items: center; color: #fff; background: var(--ak-primary); border-radius: 50%; }
.student-email-list { display: grid; gap: 1rem; }
.student-email-card .email-row-head h3 { color: #495057; }
.closed-note { display: inline-flex; gap: .4rem; color: #6c757d; padding: .75rem; background: #f8f9fa; border-radius: .2rem; }
.member-form .text-white { color: #495057 !important; }

/* Login pages */
.portal-auth { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1fr) 440px; background: var(--ak-body); }
.portal-auth-visual { min-height: 100vh; display: flex; flex-direction: column; justify-content: space-between; padding: 3rem; color: #fff; background: linear-gradient(135deg, var(--ak-sidebar), var(--ak-sidebar-dark)); }
.portal-auth-panel { min-height: 100vh; display: grid; place-items: center; padding: 2rem; background: #fff; }
.portal-card { width: min(100%, 420px); padding: 1.5rem; }
.portal-card h2 { font-size: 1.35rem; }
.auth-brand, .brand-line { display: flex; align-items: center; gap: .75rem; }
.portal-auth-visual .auth-brand img, .portal-card .brand-line img { width: 38px; height: 38px; object-fit: contain; border-radius: .2rem; background: #fff; }
.auth-statement h1 { color: #fff; font-family: inherit; font-size: 2.5rem; font-weight: 600; }
.auth-statement p { color: rgba(255,255,255,.7); }
.auth-stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.auth-stat-row > div { padding: 1rem; border-radius: .2rem; background: rgba(255,255,255,.08); }
.auth-stat-row strong { display: block; color: #fff; }
.auth-stat-row span { color: rgba(255,255,255,.65); font-size: .75rem; }
.auth-switch { display: grid; grid-template-columns: repeat(2, 1fr); gap: .25rem; padding: .25rem; margin-bottom: 1rem; background: #f1f3f5; border-radius: .2rem; }
.auth-switch a { padding: .5rem; text-align: center; color: #6c757d; border-radius: .2rem; }
.auth-switch a.active { color: #fff; background: var(--ak-primary); }

/* Animations */
@keyframes fadeInUp {
  from { opacity:0; transform:translateY(24px); }
  to { opacity:1; transform:translateY(0); }
}
@keyframes shimmer {
  0% { transform:translateX(-100%) skewX(-15deg); }
  100% { transform:translateX(200%) skewX(-15deg); }
}
@keyframes pulse-glow {
  0%,100% { box-shadow:0 8px 32px rgba(59,130,246,.35); }
  50% { box-shadow:0 8px 40px rgba(59,130,246,.5),0 0 60px rgba(59,130,246,.15); }
}
.fade-in-up { animation:fadeInUp .6s ease both; }

.hover-lift { transition:transform .25s ease,box-shadow .25s ease; }
.hover-lift:hover { transform:translateY(-3px); box-shadow:0 12px 40px rgba(0,0,0,.1) !important; }

.stat-card { position:relative; overflow:hidden; border:0 !important; border-radius:.75rem !important; min-height:150px; padding:1.5rem; }
.stat-card .stat-icon { width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(255,255,255,.18);font-size:1.3rem;margin-bottom:.75rem;backdrop-filter:blur(8px); }
.stat-card strong { font-size:2.4rem;font-weight:700;letter-spacing:-.03em;line-height:1.1;margin:.25rem 0; }
.stat-card::after,.stat-card::before { display:none; }

.stat-shimmer {
  position:absolute;
  top:0;left:0;width:100%;height:100%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent);
  transform:translateX(-100%) skewX(-15deg);
  animation:shimmer 3s ease-in-out infinite;
  pointer-events:none;
}

.metric-item { background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:.5rem;padding:.85rem;transition:background .2s ease; }
.metric-item:hover { background:rgba(255,255,255,.1); }

.progress-fill { transition:width 1.2s ease; }

.card-header { background:transparent; }

.activity-row {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:.75rem 0;
  border-bottom:1px solid #f1f3f5;
  animation:fadeInUp .4s ease both;
}
.activity-row:last-child { border-bottom:0; }

/* Viewer */
.material-fullscreen { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; background: #212529; color: #fff; }
.viewer-topbar { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.5rem; background: var(--ak-sidebar); }
.viewer-topbar a { color: #fff; font-weight: 500; }
.viewer-topbar h1 { color: #fff; margin: .25rem 0; font-size: 1.25rem; }
.viewer-topbar p { color: rgba(255,255,255,.65); margin: 0; }
.viewer-topbar > span { color: #fff; background: var(--ak-primary); padding: .35rem .55rem; border-radius: .2rem; }
.protected-viewer { min-height: 68vh; background: #111; }
.protected-viewer.fullscreen { height: calc(100vh - 104px); }
.protected-viewer iframe, .protected-viewer img { width: 100%; height: 100%; border: 0; object-fit: contain; }
.fullscreen-note { margin: 0; padding: .5rem 1.5rem; color: rgba(255,255,255,.65); background: #212529; }
.no-copy { user-select: none; }

.admin-toast-stack { position: fixed; right: 1rem; top: 1rem; z-index: 1080; display: grid; gap: .75rem; }
.admin-toast { width: min(380px, calc(100vw - 2rem)); padding: .85rem 1rem; color: #fff; background: #212529; border-radius: .2rem; box-shadow: var(--ak-shadow); }
.admin-toast.success { background: var(--ak-success); }
.admin-toast.error { background: var(--ak-danger); }
.confirm-backdrop { position: fixed; inset: 0; z-index: 1075; display: none; place-items: center; padding: 1rem; background: rgba(0,0,0,.45); }
.confirm-backdrop.is-open { display: grid; }
.confirm-dialog { width: min(100%, 430px); padding: 1.25rem; background: #fff; border-radius: .2rem; box-shadow: var(--ak-shadow); }
.confirm-actions { display: flex; justify-content: flex-end; gap: .5rem; margin-top: 1rem; }
.field-error { display: block; color: var(--ak-danger); font-size: .75rem; margin-top: .25rem; }
.is-invalid, .has-error input, .has-error select, .has-error textarea { border-color: var(--ak-danger) !important; }

/* Notes modal */
.note-card {
  border-radius:.5rem;
  margin-bottom:.85rem;
  overflow:hidden;
}
.note-system {
  background:#fef2f2;
  border:1px solid #fecaca;
  border-left:3px solid #dc2626;
}
.note-user {
  background:#f8fafc;
  border:1px solid #e2e8f0;
  border-left:3px solid #3b82f6;
}
.note-header {
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:.65rem .85rem .35rem;
  gap:.5rem;
}
.note-author {
  display:flex;
  align-items:center;
  gap:.5rem;
}
.note-badge {
  display:inline-flex;
  align-items:center;
  padding:.2rem .55rem;
  border-radius:4px;
  font-size:.65rem;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.03em;
}
.badge-system { color:#991b1b; background:#fee2e2; }
.badge-user { color:#1e40af; background:#dbeafe; }
.note-time { color:#6b7280; font-size:.7rem; font-weight:500; }
.note-actions { display:flex; gap:.25rem; }
.note-body { padding:0 .85rem .75rem; }
.note-body p { margin:0;font-size:.875rem;line-height:1.55; }
.note-system .note-body p { color:#991b1b; }
.note-user .note-body p { color:#1e293b; }

@media (max-width: 1100px) {
  .stat-grid, .student-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dashboard-grid, .admin-material-grid, .member-command-grid, .member-learning-strip, .member-dashboard-feed { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .wrapper,
  .portal-shell { display: block; }
  .sidebar,
  .portal-sidebar { width: 100%; min-width: 0; max-width: none; min-height: auto; flex: none; }
  .sidebar-content { min-height: auto; }
  .main,
  .portal-main { width: 100%; max-width: 100%; }
  .sidebar-nav,
  .portal-nav { flex-direction: row; overflow-x: auto; padding: .5rem; }
  .sidebar-header,
  .nav-section { display: none; }
  .sidebar-link,
  .portal-nav a { border-left: 0; border-bottom: 3px solid transparent; white-space: nowrap; }
  .sidebar-item.active > .sidebar-link,
  .portal-nav a.active { border-left: 0; border-bottom-color: var(--ak-primary); }
  .navbar-bg,
  .portal-topbar { align-items: flex-start; flex-wrap: wrap; }
  .portal-title { flex-basis: 100%; order: 3; }
  .filter-bar, .inline-form-grid, .choice-grid, .material-grid { grid-template-columns: 1fr !important; }
  .table-panel { overflow-x: auto; }
  .portal-auth { grid-template-columns: 1fr; }
  .portal-auth-visual { min-height: auto; padding: 2rem; }
  .portal-auth-panel { min-height: auto; }
  .auth-stat-row { display: none; }
}

@media (max-width: 560px) {
  .portal-main > .stat-grid,
  .portal-main > .dashboard-grid,
  .portal-main > .filter-bar,
  .portal-main > .table-panel,
  .portal-main > .premium-panel,
  .portal-main > .admin-material-grid,
  .portal-main > .message-list-panel,
  .portal-main > .flash,
  .portal-main > .d-flex { margin-left: 1rem; margin-right: 1rem; }
  .stat-grid, .metric-strip { grid-template-columns: 1fr; }
  .student-shell { padding: 1rem; }
  .student-header { margin: -1rem -1rem 1rem; flex-direction: column; align-items: flex-start; }
  .student-nav { overflow-x: auto; width: 100%; flex-wrap: nowrap; }
  .student-profile-strip { flex-direction: column; align-items: flex-start; }
  .email-row { grid-template-columns: 1fr; }
  .email-row-head { flex-direction: column; }
}

/* ===== Student Portal (Fresh Design) ===== */
:root {
  --s-primary: #6366f1;
  --s-primary-dark: #4f46e5;
  --s-primary-light: #eef2ff;
  --s-accent: #ec4899;
  --s-emerald: #10b981;
  --s-amber: #f59e0b;
  --s-rose: #ef4444;
  --s-hero: #1e293b;
  --s-hero-2: #334155;
  --s-bg: #f8fafc;
  --s-card: #ffffff;
  --s-text: #1e293b;
  --s-text-secondary: #64748b;
  --s-text-muted: #94a3b8;
  --s-border: #f1f5f9;
}

.s-page {
  min-height: 100vh;
  background: var(--s-bg);
  padding: 1rem;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
}
.s-has-bottom-nav { padding-bottom: 5rem; }
.s-page a { color: inherit; }

/* Header */
.s-header {
  background: var(--s-card);
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--s-border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.s-top { display:flex; align-items:center; justify-content:space-between; }
.s-logo { display:flex; align-items:center; gap:.5rem; text-decoration:none; }
.s-logo img { width:32px; height:32px; border-radius:8px; }
.s-logo span { font-weight:700; font-size:1rem; color:var(--s-text); }
.s-greeting { font-size:.75rem; color:var(--s-text-muted); font-weight:500; }
.s-header-right { display:flex; align-items:center; gap:.5rem; }
.s-mobile-logout {
  display:flex; align-items:center; justify-content:center;
  width:34px; height:34px; border-radius:10px;
  color:var(--s-text-muted); font-size:1.15rem;
  transition:all .2s; text-decoration:none;
}
.s-mobile-logout:hover { background:#fee2e2; color:var(--s-rose); }

/* Bottom Nav */
.s-bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 30;
  display:flex;
  background:var(--s-card);
  border-top:1px solid var(--s-border);
  padding:.35rem 0 env(safe-area-inset-bottom,0);
  box-shadow:0 -4px 20px rgba(0,0,0,.06);
}
.s-bottom-nav a {
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
  padding:.35rem 0 .25rem;
  color:var(--s-text-muted);
  text-decoration:none;
  font-size:.6rem;
  font-weight:600;
  transition:color .2s;
  position:relative;
}
.s-bottom-nav a i { font-size:1.3rem; transition:transform .2s; }
.s-bottom-nav a.active i { transform:translateY(-2px); }
.s-bottom-nav a span { transition:color .2s; }
.s-bottom-nav a.active { color:var(--s-primary); }
.s-bottom-nav a.active i { color:var(--s-primary); }

/* Hero */
.s-hero {
  background:linear-gradient(135deg,var(--s-hero),var(--s-hero-2));
  border-radius:20px;
  padding:1.5rem;
  color:#fff;
  margin-bottom:1.25rem;
  position:relative; overflow:hidden;
}
.s-hero::before {
  content:''; position:absolute; top:-40%; right:-15%;
  width:300px; height:300px; border-radius:50%;
  background:radial-gradient(circle,rgba(99,102,241,.12),transparent);
  pointer-events:none;
}
.s-hero::after {
  content:''; position:absolute; bottom:-30%; left:-10%;
  width:240px; height:240px; border-radius:50%;
  background:radial-gradient(circle,rgba(236,73,153,.08),transparent);
  pointer-events:none;
}
.s-hero-top { display:flex; align-items:center; gap:1rem; position:relative; z-index:1; }
.s-avatar {
  width:56px; height:56px; border-radius:16px;
  display:grid; place-items:center;
  background:linear-gradient(135deg,var(--s-primary),var(--s-accent));
  color:#fff; font-size:1.4rem; font-weight:700;
  flex:0 0 56px;
  overflow:hidden;
  animation:float 4s ease-in-out infinite;
}
.s-avatar img { width:100%; height:100%; object-fit:cover; }
.s-hero h1 { font-size:1.35rem; font-weight:700; margin:0; color:#fff; }
.s-hero p { font-size:.8rem; color:rgba(255,255,255,.6); margin:0; }
.s-hero .s-badge { background:rgba(255,255,255,.12); color:#fff; }

/* Badge */
.s-badge {
  display:inline-flex; padding:.2rem .6rem; border-radius:999px;
  font-size:.6rem; font-weight:700; text-transform:uppercase;
  letter-spacing:.04em;
  background:rgba(255,255,255,.15); color:#fff;
}
.s-badge-new, .s-badge-open { background:#fef3c7; color:#92400e; }
.s-badge-accepted, .s-badge-active, .s-badge-resolved { background:#d1fae5; color:#065f46; }
.s-badge-rejected, .s-badge-blocked, .s-badge-closed { background:#fee2e2; color:#991b1b; }
.s-badge-in_progress, .s-badge-waiting_student { background:#dbeafe; color:#1e40af; }

/* Stats */
.s-stats { display:grid; grid-template-columns:repeat(2,1fr); gap:.75rem; margin-bottom:1.25rem; }
.s-stat-card {
  border-radius:16px; padding:1rem;
  display:flex; flex-direction:column; gap:2px;
  transition:transform .3s ease, box-shadow .3s ease;
}
.s-stat-card:hover { transform:translateY(-3px) scale(1.02); box-shadow:0 12px 30px rgba(0,0,0,.08); }
.s-stat-card i { font-size:1.4rem; opacity:.9; }
.s-stat-card strong { font-size:1.6rem; font-weight:700; line-height:1.1; }
.s-stat-card span { font-size:.65rem; opacity:.8; font-weight:600; letter-spacing:.02em; text-transform:uppercase; }

/* Hover lift for cards */
.s-hover-lift { transition:transform .3s ease, box-shadow .3s ease; }
.s-hover-lift:hover { transform:translateY(-3px); box-shadow:0 12px 32px rgba(0,0,0,.1); }

/* Hero avatar float */
.s-avatar { animation:float 4s ease-in-out infinite; }

/* Sections */
.s-section { margin-bottom:1.25rem; }
.s-section-head {
  display:flex; align-items:center; justify-content:space-between; gap:.75rem;
  margin-bottom:.75rem;
}
.s-section-head h1 { font-size:1.25rem; font-weight:700; margin:0; color:var(--s-text); }
.s-section-head h2 { font-size:.95rem; font-weight:700; margin:0; color:var(--s-text); display:flex; align-items:center; gap:.35rem; }
.s-section-head h2 i { color:var(--s-primary); }
.s-section-head p { font-size:.75rem; color:var(--s-text-secondary); margin:0; }
.s-count { min-width:26px; height:26px; display:grid; place-items:center; border-radius:999px; background:var(--s-primary-light); color:var(--s-primary); font-size:.7rem; font-weight:700; }

/* Cards */
.s-card {
  background:var(--s-card); border-radius:16px; padding:1.25rem;
  box-shadow:0 2px 12px rgba(0,0,0,.04);
  margin-bottom:1rem;
}
.s-empty { color:var(--s-text-muted); font-size:.85rem; text-align:center; padding:1rem 0; margin:0; }

/* Announcements */
.s-announcement {
  background:var(--s-card); border-radius:14px; padding:1rem;
  margin-bottom:.65rem; box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.s-announcement strong { display:block; color:var(--s-text); font-size:.85rem; margin-bottom:4px; }
.s-announcement p { color:var(--s-text-secondary); font-size:.8rem; margin:0 0 4px; line-height:1.5; }
.s-announcement small { color:var(--s-text-muted); font-size:.65rem; }

/* Messages */
.s-message {
  background:var(--s-card); border-radius:14px; padding:1rem;
  margin-bottom:.65rem; border-left:3px solid var(--s-primary);
  box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.s-message strong { display:block; color:var(--s-text); font-size:.85rem; }
.s-message p { color:var(--s-text-secondary); font-size:.8rem; margin:4px 0; }
.s-message small { color:var(--s-text-muted); font-size:.65rem; }

/* Quick Links */
.s-quick-links { display:grid; grid-template-columns:repeat(3,1fr); gap:.65rem; }
.s-quick-card {
  border-radius:14px; padding:1rem .75rem; color:#fff; text-decoration:none;
  display:flex; flex-direction:column; align-items:center; gap:.35rem;
  text-align:center; font-size:.7rem; font-weight:600;
}
.s-quick-card i { font-size:1.3rem; }

/* Materials */
.s-material-card {
  display:flex; align-items:center; gap:.85rem;
  background:#fff; border-radius:14px; padding:.85rem;
  margin-bottom:.65rem; text-decoration:none;
  box-shadow:0 2px 8px rgba(0,0,0,.04);
  transition:transform .2s;
}
.s-material-card:active { transform:scale(.98); }
.s-material-icon {
  width:44px; height:44px; border-radius:12px;
  display:grid; place-items:center; color:#fff;
  flex:0 0 44px; font-size:1.2rem;
}
.s-material-info { flex:1; min-width:0; }
.s-material-info strong { display:block; color:var(--s-text); font-size:.85rem; }
.s-material-info span { display:block; color:var(--s-text-secondary); font-size:.72rem; margin-top:2px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.s-material-info small { color:var(--s-text-muted); font-size:.6rem; }
.s-arrow { color:#cbd5e1; font-size:1.1rem; }

/* Auth */
.s-auth {
  background:linear-gradient(135deg,#eef2ff,#fdf2f8);
  display:grid; place-items:center; min-height:100vh;
  padding:1.5rem;
}
.s-auth-box {
  width:min(100%,400px);
  background:var(--s-card); border-radius:24px; padding:2rem;
  box-shadow:0 24px 80px rgba(0,0,0,.08);
}
.s-auth-brand { text-align:center; margin-bottom:1.5rem; }
.s-auth-brand img { width:56px;height:56px;border-radius:14px;margin-bottom:.5rem; }
.s-auth-brand h1 { font-size:1.35rem;font-weight:700;color:var(--s-text);margin:0; }
.s-auth-brand p { font-size:.8rem;color:var(--s-text-secondary);margin:.25rem 0 0; }
.s-auth-footer { text-align:center; font-size:.8rem; color:var(--s-text-secondary); margin-top:1rem; }
.s-auth-footer a { color:var(--s-primary); font-weight:600; }
.s-back { display:block; text-align:center; font-size:.75rem; color:var(--s-text-muted); margin-top:.75rem; }

/* Flash */
.s-flash {
  padding:.65rem .85rem; border-radius:12px; font-size:.8rem; font-weight:600;
  margin-bottom:1rem;
}
.s-flash-success { background:#d1fae5; color:#065f46; }
.s-flash-error { background:#fee2e2; color:#991b1b; }
.s-flash-info { background:#eef2ff; color:#4338ca; }

/* Fields */
.s-field { margin-bottom:1rem; }
.s-field label { display:block; font-size:.75rem; font-weight:600; color:#374151; margin-bottom:.3rem; }
.s-field input, .s-field select, .s-field textarea {
  width:100%; min-height:42px; border:1.5px solid #e2e8f0;
  border-radius:12px; padding:.5rem .75rem; font-size:.85rem;
  background:var(--s-card); color:var(--s-text); outline:none;
}
.s-field input:focus, .s-field select:focus, .s-field textarea:focus {
  border-color:var(--s-primary); box-shadow:0 0 0 3px rgba(26,86,219,.12);
}

/* Buttons */
.s-btn {
  min-height:42px; display:inline-flex; align-items:center; justify-content:center;
  gap:.35rem; padding:.5rem 1.25rem; border-radius:999px;
  font-size:.8rem; font-weight:600; border:0; cursor:pointer;
  text-decoration:none; transition:all .25s ease;
}
.s-btn:active { transform:scale(.97); }
.s-btn-primary { background:var(--s-primary); color:#fff; }
.s-btn-primary:hover { background:var(--s-primary-dark); transform:translateY(-2px); box-shadow:0 8px 24px rgba(37,99,235,.2); }
.s-btn-sm { min-height:34px; padding:.3rem .85rem; font-size:.75rem; }
.s-btn-outline { background:var(--s-card); color:var(--s-text-secondary); border:1.5px solid #e2e8f0; }
.s-btn-outline:hover { border-color:var(--s-primary); color:var(--s-primary); }

/* Tickets/Doubts */
.s-ticket {
  background:var(--s-card); border-radius:16px; padding:1rem;
  margin-bottom:.75rem; box-shadow:0 2px 8px rgba(0,0,0,.04);
}
.s-ticket-head { display:flex; justify-content:space-between; align-items:center; gap:.5rem; margin-bottom:.35rem; }
.s-ticket-head strong { color:var(--s-text); font-size:.9rem; }
.s-ticket-id { color:var(--s-text-muted); font-size:.65rem; font-weight:500; }
.s-ticket-meta { display:flex; gap:.75rem; margin-bottom:.75rem; }
.s-ticket-meta span { color:var(--s-text-muted); font-size:.65rem; }
.s-ticket-thread { display:grid; gap:.65rem; margin-bottom:.75rem; }
.s-msg { padding:.75rem; border-radius:12px; background:#f8fafc; max-width:90%; }
.s-msg-mine { margin-left:auto; background:#eff6ff; }
.s-msg-head { display:flex; justify-content:space-between; gap:.5rem; margin-bottom:.25rem; }
.s-msg-head strong { font-size:.75rem; color:var(--s-text); }
.s-msg-head small { font-size:.6rem; color:var(--s-text-muted); }
.s-msg p { font-size:.8rem; color:#334155; margin:0; line-height:1.5; }
.s-reply { display:flex; gap:.5rem; }
.s-reply textarea { flex:1; min-height:36px; border:1.5px solid #e2e8f0; border-radius:12px; padding:.45rem .65rem; font-size:.8rem; resize:none; }
.s-reply textarea:focus { outline:none; border-color:var(--s-primary); }
.s-closed-badge { display:inline-flex; align-items:center; gap:.35rem; padding:.35rem .65rem; background:#f1f5f9; border-radius:999px; color:var(--s-text-secondary); font-size:.7rem; font-weight:600; }

/* Email-style list */
.s-email-list { display:grid; gap:.65rem; }
.s-email-item {
  background:var(--s-card); border-radius:16px; overflow:hidden;
  box-shadow:0 2px 8px rgba(0,0,0,.04); cursor:pointer;
  border:1px solid var(--s-border);
  transition:box-shadow .2s;
}
.s-email-item:hover { box-shadow:0 4px 16px rgba(0,0,0,.08); }
.s-email-preview {
  display:flex; align-items:center; gap:.75rem; padding:.85rem;
}
.s-email-avatar {
  width:42px; height:42px; border-radius:12px;
  display:grid; place-items:center; color:#fff;
  font-weight:700; font-size:1rem; flex:0 0 42px;
}
.s-email-info { flex:1; min-width:0; }
.s-email-head { display:flex; justify-content:space-between; align-items:center; gap:.5rem; }
.s-email-head strong { font-size:.85rem; color:var(--s-text); }
.s-email-date { font-size:.65rem; color:var(--s-text-muted); white-space:nowrap; }
.s-email-meta { display:flex; gap:.5rem; align-items:center; margin-top:3px; flex-wrap:wrap; }
.s-email-meta span:not(.s-badge) { font-size:.65rem; color:var(--s-text-muted); }
.s-email-arrow { color:var(--s-text-muted); font-size:1.1rem; transition:transform .25s ease; flex:0 0 auto; }
.s-email-thread { padding:0 .85rem .85rem; border-top:1px solid var(--s-border); padding-top:.75rem; display:grid; gap:.65rem; }

/* Profile */
.s-profile-card {
  background:linear-gradient(135deg,var(--s-hero),var(--s-hero-2));
  border-radius:20px; padding:2rem 1.5rem; text-align:center;
  color:#fff; margin-bottom:1.25rem;
}
.s-profile-avatar {
  width:72px; height:72px; border-radius:20px;
  display:grid; place-items:center;
  background:linear-gradient(135deg,var(--s-primary),var(--s-accent));
  color:#fff; font-size:2rem; font-weight:700;
  margin:0 auto .75rem; overflow:hidden; position:relative;
}
.s-profile-avatar img { width:100%; height:100%; object-fit:cover; }
.s-profile-avatar { position:relative; }
.s-avatar-overlay { position:absolute; inset:0; border-radius:20px; display:grid; place-items:center; background:rgba(0,0,0,.5); color:#fff; font-size:.75rem; font-weight:600; gap:.25rem; opacity:0; transition:opacity .25s; cursor:pointer; }
.s-profile-avatar:hover .s-avatar-overlay { opacity:1; }
.s-avatar-overlay i { font-size:1.2rem; }
.s-profile-card h2 { color:#fff; font-size:1.2rem; font-weight:700; margin:0; }
.s-profile-card p { color:rgba(255,255,255,.55); font-size:.8rem; margin:.25rem 0 .5rem; }
.s-profile-card .s-badge { background:rgba(255,255,255,.12); color:#fff; }
.s-form { background:var(--s-card); border-radius:16px; padding:1.25rem; box-shadow:0 2px 12px rgba(0,0,0,.04); }

/* Viewer */
.s-viewer { min-height:100vh; background:var(--s-bg); color:var(--s-text); display:flex; flex-direction:column; }
.s-viewer-top { display:flex; align-items:center; justify-content:space-between; padding:.75rem 1rem; background:var(--s-card); border-bottom:1px solid var(--s-border); position:sticky; top:0; z-index:10; }
.s-viewer-top a { color:var(--s-primary); font-size:.8rem; display:flex; align-items:center; gap:.35rem; text-decoration:none; font-weight:600; }
.s-viewer-content { flex:1; padding:1rem; max-width:960px; margin:0 auto; width:100%; }
.s-viewer-content h1 { font-size:1.15rem; color:var(--s-text); margin:0 0 .25rem; }
.s-viewer-content p { color:var(--s-text-secondary); font-size:.8rem; margin:0 0 1rem; }
.s-video-wrap { position:relative; padding-bottom:56.25%; border-radius:16px; overflow:hidden; background:#000; box-shadow:0 4px 20px rgba(0,0,0,.1); }
.s-video-wrap iframe { position:absolute; inset:0; width:100%; height:100%; border:0; }
.s-pdf-wrap { position:relative; height:75vh; border-radius:16px; overflow:hidden; background:var(--s-card); border:1px solid var(--s-border); box-shadow:0 4px 20px rgba(0,0,0,.06); }
.s-pdf-wrap iframe { width:100%; height:100%; border:0; }
.s-pdf-overlay {
  position:absolute; inset:0; z-index:2; pointer-events:none;
  background:repeating-linear-gradient(45deg,transparent,transparent 40px,rgba(99,102,241,.02) 40px,rgba(99,102,241,.02) 41px);
}
.s-protected-img { position:relative; border-radius:16px; overflow:hidden; display:inline-block; max-width:100%; }
.s-protected-img img { display:block; max-width:100%; border-radius:16px; }
.s-watermark {
  position:absolute; inset:0; display:grid; place-items:center;
  font-size:clamp(1.5rem,4vw,3rem); font-weight:900; color:rgba(99,102,241,.08);
  letter-spacing:.15em; text-transform:uppercase; pointer-events:none;
  transform:rotate(-30deg); user-select:none;
}
.s-viewer img { max-width:100%; border-radius:16px; }
.s-viewer-note { text-align:center; padding:.65rem; color:var(--s-text-muted); font-size:.7rem; display:flex; align-items:center; justify-content:center; gap:.35rem; background:var(--s-card); border-top:1px solid var(--s-border); }

/* PDF.js Viewer */
.s-pdf-toolbar {
  display:flex; align-items:center; justify-content:space-between;
  padding:.5rem .75rem; background:var(--s-card); border:1px solid var(--s-border);
  border-radius:12px 12px 0 0; gap:.5rem; flex-wrap:wrap;
}
.s-pdf-tools-left, .s-pdf-tools-center, .s-pdf-tools-right {
  display:flex; align-items:center; gap:.3rem;
}
.s-pdf-btn {
  width:32px; height:32px; display:inline-flex; align-items:center; justify-content:center;
  border:1px solid #e2e8f0; border-radius:8px; background:#fff; color:#475569;
  font-size:.9rem; cursor:pointer; transition:all .15s;
}
.s-pdf-btn:hover { background:#f1f5f9; border-color:#cbd5e1; }
#pdf-page-info, #pdf-zoom-info { font-size:.75rem; color:#475569; font-weight:600; min-width:50px; text-align:center; }
.s-viewer-note-inline { font-size:.65rem; color:#94a3b8; display:flex; align-items:center; gap:.25rem; }
.s-pdf-viewer {
  border:1px solid var(--s-border); border-top:0; border-radius:0 0 12px 12px;
  background:#f8fafc; min-height:65vh; overflow:auto; position:relative;
  display:flex; justify-content:center; padding:1rem;
}
#pdf-canvas { max-width:100%; height:auto !important; box-shadow:0 4px 20px rgba(0,0,0,.08); }
.s-pdf-loading {
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  color:#94a3b8; font-size:.9rem; gap:.5rem;
}
.s-pdf-loading i { animation:spin 1s linear infinite; }
@keyframes spin { from { transform:rotate(0deg); } to { transform:rotate(360deg); } }
.s-pdf-watermark {
  position:absolute; inset:0; pointer-events:none; z-index:5;
  overflow:hidden; user-select:none;
  display:flex; align-items:center; justify-content:center;
}
.s-pdf-wm-single {
  display:flex; align-items:center; gap:16px;
  opacity:.15; transform:rotate(-25deg);
  font-size:clamp(2rem,5vw,4rem); font-weight:800;
  color:rgba(99,102,241,.7); letter-spacing:.08em; white-space:nowrap;
}
.s-pdf-wm-single img { width:clamp(48px,8vw,96px); height:auto; opacity:.7; }

/* Animations */
@keyframes fadeInUp { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes slideInLeft { from { opacity:0; transform:translateX(-24px); } to { opacity:1; transform:translateX(0); } }
@keyframes slideInRight { from { opacity:0; transform:translateX(24px); } to { opacity:1; transform:translateX(0); } }
@keyframes float { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-6px); } }
@keyframes pulse-soft { 0%,100% { transform:scale(1); } 50% { transform:scale(1.03); } }
@keyframes shimmer { 0% { background-position:-200% 0; } 100% { background-position:200% 0; } }
@keyframes glow { 0%,100% { box-shadow:0 0 8px rgba(59,130,246,.15); } 50% { box-shadow:0 0 20px rgba(59,130,246,.25); } }
.fade-in-up { animation:fadeInUp .45s ease both; }
.fade-in { animation:fadeIn .5s ease both; }
.float { animation:float 3s ease-in-out infinite; }

/* ===== Desktop Student Portal (≥1024px) ===== */
@media (min-width: 1024px) {
  .s-header { display:none; }
  .s-bottom-nav { display:none; }
  .s-has-bottom-nav { padding-bottom:0; }
  .s-page { background:#f0f2f5; }

  .s-desktop-sidebar {
    display:flex; flex-direction:column;
    width:280px; min-width:280px; min-height:100vh;
    background:var(--s-card);
    color:var(--s-text); padding:0; position:fixed; left:0; top:0; bottom:0; z-index:50;
    box-shadow:4px 0 30px rgba(0,0,0,.06);
    border-right:1px solid var(--s-border);
  }

  .s-sidebar-brand {
    padding:1.5rem 1.25rem;
    display:flex; align-items:center; gap:.85rem;
    border-bottom:1px solid var(--s-border);
  }
  .s-sidebar-brand img { width:42px; height:42px; border-radius:12px; background:#fff; border:1px solid var(--s-border); }
  .s-sidebar-brand strong { display:block; font-size:1rem; font-weight:700; color:var(--s-text); }
  .s-sidebar-brand span { font-size:.7rem; color:var(--s-text-muted); }

  .s-sidebar-nav { flex:1; padding:1rem .75rem; display:flex; flex-direction:column; gap:4px; }
  .s-sidebar-nav a {
    display:flex; align-items:center; gap:.75rem;
    padding:.7rem .85rem; border-radius:12px;
    color:var(--s-text-secondary); font-size:.85rem; font-weight:500;
    text-decoration:none; transition:all .2s;
  }
  .s-sidebar-nav a i { font-size:1.2rem; width:24px; color:var(--s-text-muted); }
  .s-sidebar-nav a:hover { background:#f1f5f9; color:var(--s-text); }
  .s-sidebar-nav a:hover i { color:var(--s-primary); }
  .s-sidebar-nav a.active { background:var(--s-primary-light); color:var(--s-primary); }
  .s-sidebar-nav a.active i { color:var(--s-primary); }

  .s-sidebar-footer { padding:.75rem; border-top:1px solid var(--s-border); }
  .s-sidebar-logout {
    display:flex; align-items:center; gap:.65rem;
    padding:.7rem .85rem; border-radius:12px;
    color:var(--s-text-muted); font-size:.8rem; font-weight:500;
    text-decoration:none; transition:all .2s;
  }
  .s-sidebar-logout:hover { background:#fef2f2; color:var(--s-rose); }

  /* Main content area */
  .s-page { margin-left:280px; padding:2rem 2.5rem; min-height:100vh; }
  .s-page > * { max-width:960px; margin-left:auto; margin-right:auto; }
  .s-page.s-auth { margin-left:0; padding:0; }
  .s-page.s-auth > * { max-width:none; }

  .s-hero {
    padding:2rem 2.5rem; border-radius:24px; margin-bottom:1.5rem;
    background:linear-gradient(135deg,#0f172a,#1e293b);
    position:relative; overflow:hidden;
  }
  .s-hero::before {
    content:''; position:absolute; top:-50%; right:-20%;
    width:400px; height:400px; border-radius:50%;
    background:radial-gradient(circle,rgba(59,130,246,.12),transparent);
    pointer-events:none;
  }
  .s-hero::after {
    content:''; position:absolute; bottom:-30%; left:-10%;
    width:300px; height:300px; border-radius:50%;
    background:radial-gradient(circle,rgba(139,92,246,.1),transparent);
    pointer-events:none;
  }
  .s-hero-top { position:relative; z-index:1; }
  .s-avatar { width:72px; height:72px; border-radius:20px; flex:0 0 72px; font-size:1.8rem; }
  .s-hero h1 { font-size:1.8rem; }

  .s-stats { grid-template-columns:repeat(4,1fr); gap:1rem; margin-bottom:1.5rem; }
  .s-stat-card {
    border-radius:18px; padding:1.25rem;
    transition:transform .3s ease, box-shadow .3s ease;
    backdrop-filter:blur(12px);
  }
  .s-stat-card:hover { transform:translateY(-4px) scale(1.02); box-shadow:0 16px 40px rgba(0,0,0,.15); }
  .s-stat-card strong { font-size:1.8rem; }

  /* Glass cards */
  .s-section { margin-bottom:2rem; }
  .s-announcement, .s-message, .s-material-card, .s-ticket, .s-card, .s-form {
    background:rgba(255,255,255,.85);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    border:1px solid rgba(255,255,255,.7);
    transition:transform .3s ease, box-shadow .3s ease;
  }
  .s-announcement:hover, .s-message:hover, .s-material-card:hover, .s-ticket:hover, .s-card:hover {
    transform:translateY(-2px);
    box-shadow:0 12px 40px rgba(0,0,0,.08);
  }

  .s-material-card { padding:1rem 1.25rem; border-radius:16px; }
  .s-material-icon { width:52px; height:52px; border-radius:14px; flex:0 0 52px; font-size:1.4rem; }

  .s-quick-links { grid-template-columns:repeat(3,1fr); gap:1rem; }
  .s-quick-card {
    border-radius:16px; padding:1.5rem 1rem;
    transition:transform .3s ease, box-shadow .3s ease;
  }
  .s-quick-card:hover { transform:translateY(-4px) scale(1.03); }

  /* Profile desktop */
  .s-profile-card {
    padding:3rem 2rem; border-radius:24px;
    background:linear-gradient(135deg,#0f172a,#1e293b);
  }
  .s-profile-avatar { width:96px; height:96px; border-radius:24px; font-size:2.5rem; }
  .s-profile-card h2 { font-size:1.5rem; }

  /* Auth desktop */
  .s-auth { background:linear-gradient(135deg,#0f172a,#1e293b); }
  .s-auth-box { padding:2.5rem; border-radius:28px; box-shadow:0 32px 80px rgba(0,0,0,.25); }

  /* Viewer desktop */
  .s-viewer-top { padding:1rem 2rem; }
  .s-viewer-content { padding:1.5rem 2rem; max-width:960px; margin:0 auto; width:100%; }
  .s-viewer-content h1 { font-size:1.5rem; }

  /* Doubts desktop */
  .s-ticket { padding:1.25rem 1.5rem; border-radius:18px; }
  .s-msg { border-radius:14px; max-width:75%; }
  .s-reply textarea { min-height:42px; }

  /* More animations */
  .s-stat-card:nth-child(1) { animation:fadeInUp .4s ease .05s both; }
  .s-stat-card:nth-child(2) { animation:fadeInUp .4s ease .1s both; }
  .s-stat-card:nth-child(3) { animation:fadeInUp .4s ease .15s both; }
  .s-stat-card:nth-child(4) { animation:fadeInUp .4s ease .2s both; }
  .s-quick-card:nth-child(1) { animation:fadeInUp .4s ease .25s both; }
  .s-quick-card:nth-child(2) { animation:fadeInUp .4s ease .3s both; }
  .s-quick-card:nth-child(3) { animation:fadeInUp .4s ease .35s both; }
  .s-section-head { animation:fadeInUp .4s ease both; }
  .s-section { animation:fadeInUp .5s ease both; }

  /* Buttons */
  .s-btn { transition:all .25s ease; }
  .s-btn:hover { transform:translateY(-2px); box-shadow:0 8px 24px rgba(0,0,0,.12); }

  /* Extra spacing */
  .s-section-head { margin-bottom:1rem; }
  .s-section-head h1 { font-size:1.5rem; }
  .s-section-head h2 { font-size:1.1rem; }
}

/* Hide desktop sidebar on mobile */
.s-desktop-sidebar { display:none; }
@media (min-width: 1024px) {
  .s-desktop-sidebar { display:flex; }
}