/* ── Google Fonts ─────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── Design Tokens ─────────────────────────────────────────────── */
:root {
  --bg-primary:      #0a0a0f;
  --bg-secondary:    #0f0f1a;
  --bg-card:         #13131f;
  --bg-glass:        rgba(255,255,255,0.04);
  --bg-glass-strong: rgba(15,15,26,0.95);
  --bg-hover:        rgba(255,255,255,0.06);

  --border-glass:    rgba(255,255,255,0.08);
  --border-active:   rgba(255,45,85,0.4);

  --text-primary:    #f0f0ff;
  --text-secondary:  #a0a0c0;
  --text-muted:      #606080;

  --accent-pink:     #ff2d55;
  --accent-purple:   #7c3aed;
  --accent-cyan:     #00d4ff;
  --accent-green:    #00e676;
  --accent-orange:   #ff9100;

  --gradient-hero:   linear-gradient(135deg, #ff2d55 0%, #7c3aed 50%, #00d4ff 100%);
  --gradient-card:   linear-gradient(135deg, rgba(255,45,85,0.08) 0%, rgba(124,58,237,0.08) 100%);

  --sidebar-width:   220px;
  --radius-sm:       8px;
  --radius-md:       12px;
  --radius-lg:       16px;
  --radius-xl:       20px;

  --transition:      all 0.2s cubic-bezier(0.4,0,0.2,1);
}

/* ── Reset ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ── Scrollbar ─────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 99px; }

/* ── Layout ─────────────────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background: rgba(10,10,20,0.98);
  border-right: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  padding: 20px 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 20px;
}

.sidebar-logo .logo-icon {
  width: 36px; height: 36px;
  background: var(--gradient-hero);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.sidebar-logo .logo-text { font-size: 13px; font-weight: 700; line-height: 1.3; }
.sidebar-logo .logo-sub  { font-size: 10px; color: var(--text-muted); }

.sidebar-section-label {
  font-size: 10px; font-weight: 700; letter-spacing: 0.1em;
  color: var(--text-muted); text-transform: uppercase;
  padding: 0 20px 8px;
}

.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px;
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  border-left: 3px solid transparent;
  cursor: pointer;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active {
  color: var(--accent-pink);
  border-left-color: var(--accent-pink);
  background: rgba(255,45,85,0.08);
}
.nav-item .nav-icon { width: 16px; height: 16px; flex-shrink: 0; }
.nav-badge {
  margin-left: auto;
  font-size: 9px; font-weight: 700;
  background: var(--accent-pink);
  color: white;
  padding: 2px 6px;
  border-radius: 99px;
}

.sidebar-bottom {
  margin-top: auto;
  padding: 16px 20px;
  border-top: 1px solid var(--border-glass);
}

.user-card {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}
.user-card:hover { background: var(--bg-hover); }
.user-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.user-avatar-placeholder {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--gradient-hero);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700;
}
.user-info .user-name { font-size: 12px; font-weight: 600; }
.user-info .user-handle { font-size: 10px; color: var(--text-muted); }
.live-dot {
  width: 6px; height: 6px;
  background: var(--accent-green);
  border-radius: 50%;
  margin-left: auto;
  box-shadow: 0 0 6px var(--accent-green);
  animation: pulse 2s ease-in-out infinite;
}

/* ── Main Content ────────────────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex; align-items: center;
  padding: 16px 28px;
  border-bottom: 1px solid var(--border-glass);
  background: rgba(10,10,20,0.95);
  backdrop-filter: blur(20px);
  position: sticky; top: 0; z-index: 50;
  gap: 16px;
}
.topbar-title   { font-size: 22px; font-weight: 800; }
.topbar-sub     { font-size: 13px; color: var(--text-secondary); margin-top: 2px; }
.topbar-actions { margin-left: auto; display: flex; gap: 10px; align-items: center; }

.page-content { padding: 24px 28px; flex: 1; }

/* ── Cards ───────────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 20px;
  transition: var(--transition);
}
.card:hover { border-color: rgba(255,255,255,0.12); }
.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 20px;
  display: flex; flex-direction: column; gap: 8px;
  transition: var(--transition);
  cursor: default;
}
.stat-card:hover { border-color: rgba(255,255,255,0.14); transform: translateY(-1px); }
.stat-label { font-size: 11px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-value { font-size: 28px; font-weight: 800; line-height: 1; }
.stat-change {
  font-size: 12px; font-weight: 600;
  display: flex; align-items: center; gap: 4px;
}
.stat-change.up   { color: var(--accent-green); }
.stat-change.down { color: var(--accent-pink);  }

/* ── Grids ───────────────────────────────────────────────────────── */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; }

/* ── Buttons ─────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 600;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient-hero);
  color: white;
  box-shadow: 0 4px 20px rgba(255,45,85,0.3);
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); box-shadow: 0 6px 25px rgba(255,45,85,0.4); }
.btn-ghost  { background: var(--bg-glass); border: 1px solid var(--border-glass); color: var(--text-secondary); }
.btn-ghost:hover  { background: var(--bg-hover); color: var(--text-primary); }
.btn-danger { background: rgba(255,45,85,0.15); border: 1px solid rgba(255,45,85,0.3); color: var(--accent-pink); }
.btn-danger:hover { background: rgba(255,45,85,0.25); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }
.btn-sm { padding: 5px 12px; font-size: 12px; }

/* ── Tags ────────────────────────────────────────────────────────── */
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 11px; font-weight: 600;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
}
.tag-pink   { background: rgba(255,45,85,0.12); border-color: rgba(255,45,85,0.25); color: var(--accent-pink); }
.tag-purple { background: rgba(124,58,237,0.12); border-color: rgba(124,58,237,0.25); color: #a78bfa; }
.tag-cyan   { background: rgba(0,212,255,0.12); border-color: rgba(0,212,255,0.25); color: var(--accent-cyan); }
.tag-green  { background: rgba(0,230,118,0.12); border-color: rgba(0,230,118,0.25); color: var(--accent-green); }

/* ── Inputs ──────────────────────────────────────────────────────── */
.input, .textarea, .select {
  width: 100%;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: 13px;
  transition: var(--transition);
  outline: none;
}
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--accent-pink);
  box-shadow: 0 0 0 3px rgba(255,45,85,0.15);
}
.input::placeholder, .textarea::placeholder { color: var(--text-muted); }

/* ── Modal ───────────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(12px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn 0.15s ease;
}
.modal {
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  width: 100%; max-width: 680px;
  max-height: 88vh;
  overflow-y: auto;
  animation: slideUp 0.2s ease;
}
.modal-header {
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border-glass);
  display: flex; align-items: center; gap: 12px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}
.modal-body    { padding: 20px; display: flex; flex-direction: column; gap: 16px; }
.modal-footer  { padding: 16px 20px; border-top: 1px solid var(--border-glass); display: flex; gap: 10px; justify-content: flex-end; }

/* ── Grade Colors ────────────────────────────────────────────────── */
.grade-A { color: #00e676; } .grade-B { color: #69f0ae; }
.grade-C { color: #ff9100; } .grade-D { color: #ff5252; } .grade-F { color: #ff1744; }

/* ── Video Card ──────────────────────────────────────────────────── */
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex; gap: 0;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover { border-color: rgba(255,255,255,0.14); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.3); }
.video-thumb {
  width: 72px; min-height: 96px;
  object-fit: cover;
  flex-shrink: 0;
}
.video-thumb-placeholder {
  width: 72px; min-height: 96px;
  background: linear-gradient(135deg, rgba(255,45,85,0.2) 0%, rgba(124,58,237,0.2) 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  flex-shrink: 0;
}
.video-info { padding: 12px 14px; flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.video-title {
  font-size: 13px; font-weight: 600; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-stats { display: flex; gap: 12px; flex-wrap: wrap; }
.video-stat  { display: flex; align-items: center; gap: 4px; font-size: 11px; }

/* ── Loading ─────────────────────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid rgba(255,45,85,0.3);
  border-top-color: var(--accent-pink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}
.loading-screen {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 60vh; gap: 16px;
}
.skeleton {
  background: linear-gradient(90deg, var(--bg-glass) 25%, rgba(255,255,255,0.06) 50%, var(--bg-glass) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

/* ── Empty State ─────────────────────────────────────────────────── */
.empty-state {
  text-align: center; padding: 48px 24px;
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.empty-icon { font-size: 48px; opacity: 0.6; }
.empty-title { font-size: 16px; font-weight: 700; }
.empty-sub   { font-size: 13px; color: var(--text-secondary); max-width: 320px; }

/* ── Progress Bar ────────────────────────────────────────────────── */
.progress-bar { height: 6px; background: var(--bg-glass); border-radius: 99px; overflow: hidden; }
.progress-fill { height: 100%; border-radius: 99px; transition: width 0.4s ease; }

/* ── Divider ─────────────────────────────────────────────────────── */
.divider { height: 1px; background: var(--border-glass); margin: 4px 0; }

/* ── Animations ──────────────────────────────────────────────────── */
@keyframes spin     { to { transform: rotate(360deg); } }
@keyframes pulse    { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes fadeIn   { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp  { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes shimmer  { to { background-position: -200% 0; } }

/* ── Login Page ──────────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 30% 20%, rgba(124,58,237,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(255,45,85,0.15) 0%, transparent 60%),
              var(--bg-primary);
}
.login-card {
  background: var(--bg-glass-strong);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 48px;
  width: 100%; max-width: 440px;
  text-align: center;
  box-shadow: 0 32px 100px rgba(0,0,0,0.5);
}
.login-logo {
  width: 64px; height: 64px;
  background: var(--gradient-hero);
  border-radius: 18px;
  display: flex; align-items: center; justify-content: center;
  font-size: 32px;
  margin: 0 auto 24px;
}
.tiktok-btn {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; padding: 14px;
  background: #000;
  border: 2px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  color: white;
  font-size: 15px; font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.tiktok-btn:hover { background: #111; border-color: rgba(255,255,255,0.25); transform: translateY(-1px); }

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .main-content { margin-left: 0; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .page-content { padding: 16px; }
}

/* ── Section Header ──────────────────────────────────────────────── */
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px;
}
.section-title { font-size: 16px; font-weight: 700; }
.section-sub   { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ── Chart Placeholder ───────────────────────────────────────────── */
.chart-area {
  height: 200px;
  background: var(--bg-glass);
  border-radius: var(--radius-md);
  display: flex; align-items: flex-end; gap: 4px;
  padding: 16px 16px 0;
  overflow: hidden;
}
.chart-bar {
  flex: 1; border-radius: 4px 4px 0 0;
  background: linear-gradient(to top, var(--accent-pink), var(--accent-purple));
  opacity: 0.8;
  transition: opacity 0.2s;
  min-height: 4px;
}
.chart-bar:hover { opacity: 1; }