/* ============================================================
   LMS Student Panel — Clean Light Theme
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --s-bg:        #f0f4f8;
  --s-sidebar:   #1e293b;
  --s-card:      #ffffff;
  --s-accent:    #6366f1;
  --s-accent2:   #06b6d4;
  --s-success:   #10b981;
  --s-warning:   #f59e0b;
  --s-danger:    #ef4444;
  --s-info:      #3b82f6;
  --s-text:      #1e293b;
  --s-muted:     #64748b;
  --s-border:    #e2e8f0;
  --s-sidebar-w: 250px;
  --s-radius:    12px;
  --s-shadow:    0 4px 24px rgba(0,0,0,.08);
  --s-transition: .2s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--s-bg);
  color: var(--s-text);
  font-size: 14px;
  line-height: 1.6;
}

.bg-light.text-white,
.bg-white.text-white,
.bg-light .text-white,
.bg-white .text-white {
  color: var(--s-text) !important;
}
.bg-light .text-white-50,
.bg-white .text-white-50 {
  color: var(--s-muted) !important;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--s-bg); }
::-webkit-scrollbar-thumb { background: var(--s-border); border-radius: 3px; }

/* ── Layout ──────────────────────────────────────────────── */
#student-wrapper { display: flex; min-height: 100vh; }

/* ── Sidebar ─────────────────────────────────────────────── */
#s-sidebar {
  width: var(--s-sidebar-w);
  min-height: 100vh;
  background: var(--s-sidebar);
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: transform var(--s-transition);
}

.s-logo {
  display: flex; align-items: center; gap: 10px;
  padding: 22px 18px 18px;
  border-bottom: 1px solid rgba(255,255,255,.07);
  text-decoration: none;
}

.s-logo .icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--s-accent), var(--s-accent2));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: #fff;
}

.s-logo .text { font-size: 15px; font-weight: 700; color: #f1f5f9; }
.s-logo .text small { display: block; font-size: 11px; color: #64748b; font-weight: 400; }

.s-nav { padding: 14px 0; flex: 1; }

.s-nav-label {
  font-size: 10px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .08em; color: #475569;
  padding: 14px 18px 4px;
}

.s-nav a {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 18px;
  color: #94a3b8;
  text-decoration: none;
  font-size: 13.5px; font-weight: 500;
  transition: all var(--s-transition);
  position: relative;
}

.s-nav a i { width: 18px; text-align: center; font-size: 14px; }

.s-nav a:hover { color: #f1f5f9; background: rgba(255,255,255,.05); padding-left: 22px; }

.s-nav a.active {
  color: #fff;
  background: rgba(99,102,241,.15);
}

.s-nav a.active::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--s-accent);
  border-radius: 0 3px 3px 0;
}

.s-sidebar-footer {
  padding: 16px 18px;
  border-top: 1px solid rgba(255,255,255,.07);
}

.s-user-card {
  display: flex; align-items: center; gap: 10px;
}

.s-user-card .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--s-accent), var(--s-accent2));
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff;
  flex-shrink: 0; overflow: hidden;
}

.s-user-card .avatar img { width: 100%; height: 100%; object-fit: cover; }
.s-user-card .name { font-size: 13px; font-weight: 600; color: #f1f5f9; }
.s-user-card .roll { font-size: 11px; color: #64748b; }

/* ── Main ────────────────────────────────────────────────── */
#s-main { margin-left: var(--s-sidebar-w); flex: 1; display: flex; flex-direction: column; }

/* ── Navbar ──────────────────────────────────────────────── */
#s-navbar {
  background: #fff;
  border-bottom: 1px solid var(--s-border);
  padding: 0 24px;
  height: 62px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 500;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}

#s-toggle { background: none; border: none; color: var(--s-muted); font-size: 18px; cursor: pointer; padding: 6px; border-radius: 6px; }
#s-toggle:hover { color: var(--s-text); background: var(--s-bg); }

.s-breadcrumb { font-size: 13px; color: var(--s-muted); display: flex; align-items: center; gap: 6px; }
.s-breadcrumb a { color: var(--s-muted); text-decoration: none; }
.s-breadcrumb a:hover { color: var(--s-accent); }

.s-navbar-right { display: flex; align-items: center; gap: 10px; }

.s-nav-btn {
  background: var(--s-bg);
  border: 1px solid var(--s-border);
  color: var(--s-muted);
  width: 36px; height: 36px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; text-decoration: none;
  transition: all var(--s-transition);
}
.s-nav-btn:hover { border-color: var(--s-accent); color: var(--s-accent); }

/* ── Page ────────────────────────────────────────────────── */
.s-page { padding: 26px 26px 40px; flex: 1; }

.s-page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}

.s-page-header h1 {
  font-size: 20px; font-weight: 700;
  color: var(--s-text);
  display: flex; align-items: center; gap: 9px;
}

.s-page-header h1 i { color: var(--s-accent); }

/* ── Cards ───────────────────────────────────────────────── */
.s-card {
  background: var(--s-card);
  border: 1px solid var(--s-border);
  border-radius: var(--s-radius);
  overflow: hidden;
  box-shadow: var(--s-shadow);
}

.s-card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--s-border);
  display: flex; align-items: center; justify-content: space-between;
}

.s-card-title { font-size: 15px; font-weight: 600; color: var(--s-text); display: flex; align-items: center; gap: 8px; }
.s-card-title i { color: var(--s-accent); }
.s-card-body { padding: 20px; }

/* ── Stats ───────────────────────────────────────────────── */
.s-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }

.s-stat {
  background: var(--s-card);
  border: 1px solid var(--s-border);
  border-radius: var(--s-radius);
  padding: 20px;
  display: flex; align-items: center; gap: 14px;
  box-shadow: var(--s-shadow);
  transition: all var(--s-transition);
}

.s-stat:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.1); }

.s-stat .icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}

.s-stat .icon.blue { background: rgba(99,102,241,.1); color: var(--s-accent); }
.s-stat .icon.green { background: rgba(16,185,129,.1); color: var(--s-success); }
.s-stat .icon.yellow { background: rgba(245,158,11,.1); color: var(--s-warning); }
.s-stat .icon.cyan { background: rgba(6,182,212,.1); color: var(--s-accent2); }

.s-stat .num { font-size: 24px; font-weight: 800; color: var(--s-text); line-height: 1; }
.s-stat .lbl { font-size: 12px; color: var(--s-muted); margin-top: 3px; font-weight: 500; }

/* ── Course Cards ────────────────────────────────────────── */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }

.course-card {
  background: var(--s-card);
  border: 1px solid var(--s-border);
  border-radius: var(--s-radius);
  overflow: hidden;
  box-shadow: var(--s-shadow);
  transition: all var(--s-transition);
}

.course-card:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,.12); border-color: var(--s-accent); }

.course-card .thumb { width: 100%; height: 160px; object-fit: cover; background: linear-gradient(135deg, #6366f1, #06b6d4); display: block; }
.course-card .thumb-placeholder { width: 100%; height: 160px; background: linear-gradient(135deg, var(--s-accent), var(--s-accent2)); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,.6); font-size: 40px; }

.course-card .body { padding: 18px; }
.course-card .cat-badge { font-size: 11px; font-weight: 600; color: var(--s-accent); background: rgba(99,102,241,.08); padding: 3px 8px; border-radius: 4px; display: inline-block; margin-bottom: 8px; }
.course-card h3 { font-size: 15px; font-weight: 700; color: var(--s-text); margin-bottom: 6px; line-height: 1.3; }
.course-card .meta { display: flex; gap: 12px; flex-wrap: wrap; margin: 10px 0; }
.course-card .meta-item { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--s-muted); }
.course-card .meta-item i { color: var(--s-accent); font-size: 11px; }
.course-card .footer { padding: 14px 18px; border-top: 1px solid var(--s-border); display: flex; align-items: center; justify-content: space-between; }
.course-card .fee { font-size: 16px; font-weight: 700; color: var(--s-text); }

/* ── Progress ────────────────────────────────────────────── */
.s-progress { background: var(--s-bg); border-radius: 4px; height: 8px; overflow: hidden; margin-top: 8px; }
.s-progress-fill { height: 100%; background: linear-gradient(90deg, var(--s-accent), var(--s-accent2)); border-radius: 4px; transition: width .4s ease; }
.s-progress-label { font-size: 12px; color: var(--s-muted); margin-top: 4px; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn-s-primary {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px;
  background: var(--s-accent);
  color: #fff; border: none; border-radius: 8px;
  font-size: 13.5px; font-weight: 600;
  text-decoration: none; cursor: pointer;
  transition: all var(--s-transition);
}
.btn-s-primary:hover { background: #4f46e5; transform: translateY(-1px); color: #fff; }

.btn-s-outline {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px;
  background: transparent;
  color: var(--s-accent); border: 1.5px solid var(--s-accent);
  border-radius: 8px;
  font-size: 13.5px; font-weight: 600;
  text-decoration: none; cursor: pointer;
  transition: all var(--s-transition);
}
.btn-s-outline:hover { background: var(--s-accent); color: #fff; }

/* ── Table ───────────────────────────────────────────────── */
.s-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.s-table thead tr { background: var(--s-bg); }
.s-table th { padding: 10px 14px; text-align: left; font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--s-muted); border-bottom: 1px solid var(--s-border); }
.s-table td { padding: 12px 14px; border-bottom: 1px solid var(--s-border); color: var(--s-text); vertical-align: middle; }
.s-table tbody tr:hover { background: rgba(99,102,241,.03); }
.s-table tbody tr:last-child td { border-bottom: none; }

/* ── Badges ──────────────────────────────────────────────── */
.s-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 9px; border-radius: 20px;
  font-size: 11px; font-weight: 600; text-transform: capitalize;
}
.s-badge-pending  { background: rgba(245,158,11,.1); color: var(--s-warning); }
.s-badge-approved { background: rgba(16,185,129,.1); color: var(--s-success); }
.s-badge-rejected { background: rgba(239,68,68,.1); color: var(--s-danger); }
.s-badge-published { background: rgba(99,102,241,.1); color: var(--s-accent); }

/* ── Forms ───────────────────────────────────────────────── */
.s-form-group { margin-bottom: 18px; }
.s-label { display: block; font-size: 13px; font-weight: 500; color: var(--s-text); margin-bottom: 6px; }
.s-label .req { color: var(--s-danger); }
.s-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--s-border);
  border-radius: 8px;
  font-size: 13.5px; color: var(--s-text);
  font-family: inherit; outline: none;
  transition: border-color var(--s-transition);
  background: #fff;
}
.s-input:focus { border-color: var(--s-accent); box-shadow: 0 0 0 3px rgba(99,102,241,.1); }
.s-input::placeholder { color: #cbd5e1; }
select.s-input { cursor: pointer; }
textarea.s-input { resize: vertical; min-height: 90px; }
.s-form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.s-form-hint { font-size: 12px; color: var(--s-muted); margin-top: 4px; }

/* ── Alert ───────────────────────────────────────────────── */
.s-alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 13.5px; display: flex; align-items: center; gap: 8px; }
.s-alert-success { background: rgba(16,185,129,.08); border: 1px solid rgba(16,185,129,.2); color: #059669; }
.s-alert-danger  { background: rgba(239,68,68,.08); border: 1px solid rgba(239,68,68,.2); color: #dc2626; }
.s-alert-warning { background: rgba(245,158,11,.08); border: 1px solid rgba(245,158,11,.2); color: #d97706; }

/* ── Video Lecture Player ────────────────────────────────── */
.lecture-wrapper { display: grid; grid-template-columns: 1fr 300px; gap: 20px; }
.video-player-box { background: #000; border-radius: var(--s-radius); overflow: hidden; aspect-ratio: 16/9; position: relative; }
.video-player-box iframe, .video-player-box video { width: 100%; height: 100%; border: none; display: block; }
.lecture-list { background: var(--s-card); border: 1px solid var(--s-border); border-radius: var(--s-radius); overflow-y: auto; max-height: 500px; }
.lecture-item { padding: 12px 16px; border-bottom: 1px solid var(--s-border); display: flex; align-items: flex-start; gap: 10px; cursor: pointer; transition: background var(--s-transition); }
.lecture-item:hover { background: var(--s-bg); }
.lecture-item.active { background: rgba(99,102,241,.08); border-left: 3px solid var(--s-accent); }
.lecture-item.done .lecture-num i { color: var(--s-success); }
.lecture-num { width: 24px; flex-shrink: 0; font-size: 12px; color: var(--s-muted); text-align: center; padding-top: 2px; }
.lecture-title { font-size: 13px; font-weight: 500; color: var(--s-text); line-height: 1.3; }
.lecture-duration { font-size: 11px; color: var(--s-muted); margin-top: 3px; }

/* ── Login page ──────────────────────────────────────────── */
.s-login-page {
  min-height: 100vh;
  display: flex;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}
.s-login-left {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  padding: 40px;
  background: linear-gradient(135deg, var(--s-accent), var(--s-accent2));
}
.s-login-left-content { max-width: 420px; color: #fff; }
.s-login-left-content h1 { font-size: 36px; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.s-login-left-content p { font-size: 16px; opacity: .85; line-height: 1.7; }
.s-login-left-content .features { margin-top: 32px; display: flex; flex-direction: column; gap: 12px; }
.s-login-left-content .feat-item { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.s-login-left-content .feat-item i { width: 28px; height: 28px; background: rgba(255,255,255,.2); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: 12px; }
.s-login-right { width: 460px; display: flex; align-items: center; justify-content: center; padding: 40px; }
.s-login-card { width: 100%; max-width: 380px; }
.s-login-card h2 { font-size: 24px; font-weight: 700; color: #f1f5f9; margin-bottom: 6px; }
.s-login-card p { font-size: 13px; color: #64748b; margin-bottom: 28px; }

.s-login-input {
  width: 100%;
  background: rgba(255,255,255,.06);
  border: 1.5px solid rgba(255,255,255,.1);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 14px;
  color: #f1f5f9;
  font-family: inherit; outline: none;
  transition: all var(--s-transition);
}
.s-login-input:focus { border-color: var(--s-accent); box-shadow: 0 0 0 3px rgba(99,102,241,.2); }
.s-login-input::placeholder { color: #475569; }

.s-login-btn {
  width: 100%;
  padding: 12px;
  background: var(--s-accent);
  color: #fff; border: none; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all var(--s-transition);
  box-shadow: 0 4px 15px rgba(99,102,241,.4);
}
.s-login-btn:hover { background: #4f46e5; transform: translateY(-1px); }

/* ── Footer ──────────────────────────────────────────────── */
.s-footer { padding: 16px 26px; border-top: 1px solid var(--s-border); font-size: 12px; color: var(--s-muted); text-align: center; background: #fff; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1024px) {
  #s-sidebar { transform: translateX(-100%); }
  #s-sidebar.open { transform: translateX(0); }
  #s-main { margin-left: 0; }
  .lecture-wrapper { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .s-page { padding: 16px; }
  .s-page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
  .s-form-row { grid-template-columns: 1fr; }
  .s-login-left { display: none; }
  .s-login-right { width: 100%; }
}

/* ── Print ───────────────────────────────────────────────── */
@media print {
  #s-sidebar, #s-navbar, .s-footer, .btn-s-primary, .btn-s-outline { display: none !important; }
  #s-main { margin-left: 0 !important; }
}

#s-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 999; backdrop-filter: blur(2px); }
#s-overlay.show { display: block; }