/* ============================================================
   style.css — GradeMinx Global Styles
   Includes: theme system (light/dark + accent colors),
   mobile-responsive layout, components, animations
   ============================================================ */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=DM+Sans:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Theme: Color Accents ─────────────────────────────────── */
:root {
  --accent-hue: 220;
  --accent: hsl(var(--accent-hue), 85%, 55%);
  --accent-soft: hsl(var(--accent-hue), 85%, 95%);
  --accent-dark: hsl(var(--accent-hue), 85%, 40%);

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --transition: 0.18s ease;
  --sidebar-w: 240px;
}

/* ── Light Theme (default) ────────────────────────────────── */
[data-theme="light"] {
  --bg-page:    #f4f5f7;
  --bg-card:    #ffffff;
  --bg-sidebar: #1a1f2e;
  --bg-input:   #f8f9fb;
  --bg-hover:   #f0f2f5;

  --text-primary:   #111827;
  --text-secondary: #6b7280;
  --text-muted:     #9ca3af;
  --text-on-accent: #ffffff;
  --text-on-sidebar:#e2e8f0;

  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.16);
  --divider: rgba(0,0,0,0.06);

  --success-bg: #ecfdf5;
  --success:    #059669;
  --warning-bg: #fffbeb;
  --warning:    #d97706;
  --danger-bg:  #fef2f2;
  --danger:     #dc2626;
  --info-bg:    hsl(var(--accent-hue), 85%, 95%);
  --info:       hsl(var(--accent-hue), 85%, 45%);
}

/* ── Dark Theme ───────────────────────────────────────────── */
[data-theme="dark"] {
  --bg-page:    #0f1117;
  --bg-card:    #1a1f2e;
  --bg-sidebar: #111318;
  --bg-input:   #242836;
  --bg-hover:   #242836;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;
  --text-on-accent: #ffffff;
  --text-on-sidebar:#e2e8f0;

  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.16);
  --divider: rgba(255,255,255,0.06);

  --success-bg: rgba(5,150,105,0.15);
  --success:    #34d399;
  --warning-bg: rgba(217,119,6,0.15);
  --warning:    #fbbf24;
  --danger-bg:  rgba(220,38,38,0.15);
  --danger:     #f87171;
  --info-bg:    hsl(var(--accent-hue), 60%, 15%);
  --info:       hsl(var(--accent-hue), 85%, 65%);
}

/* ── Accent Presets ───────────────────────────────────────── */
[data-accent="blue"]   { --accent-hue: 220; }
[data-accent="violet"] { --accent-hue: 258; }
[data-accent="teal"]   { --accent-hue: 172; }
[data-accent="rose"]   { --accent-hue: 346; }
[data-accent="amber"]  { --accent-hue: 38; }

/* ── Base Reset ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.25; }
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.875rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; font-family: var(--font-body); font-weight: 600; }
p  { color: var(--text-secondary); }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

small { font-size: 0.8125rem; color: var(--text-muted); }
code  { font-family: var(--font-mono); font-size: 0.875rem; }

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

/* ── Sidebar ──────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  color: var(--text-on-sidebar);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 200;
  transition: transform var(--transition);
  overflow-y: auto;
}

.sidebar-logo {
  padding: 1.5rem 1.25rem 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

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

.sidebar-logo h1 {
  font-size: 1.1rem;
  font-family: var(--font-body);
  font-weight: 600;
  color: #fff;
  letter-spacing: -0.01em;
}

.sidebar-logo span {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.4);
  display: block;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-section {
  padding: 0.75rem 0.75rem 0.25rem;
}

.sidebar-section-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.3);
  padding: 0 0.5rem;
  margin-bottom: 0.35rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  text-decoration: none;
}

.nav-item:hover {
  background: rgba(255,255,255,0.07);
  color: rgba(255,255,255,0.9);
  text-decoration: none;
}

.nav-item.active {
  background: var(--accent);
  color: #fff;
}

.nav-item .nav-icon { font-size: 1rem; width: 20px; text-align: center; }

.sidebar-footer {
  margin-top: auto;
  padding: 1rem 0.75rem;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
}

.avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
  flex-shrink: 0;
}

.avatar-lg {
  width: 52px; height: 52px;
  font-size: 1.1rem;
}

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

.topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 4px;
}

.page-content {
  padding: 2rem 1.5rem;
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

/* ── Page Header ──────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.page-header h2 { margin-bottom: 0.25rem; }
.page-header p  { margin: 0; }

/* ── Cards ────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: background var(--transition), border var(--transition);
}

.card-sm { padding: 1rem 1.25rem; }

/* ── Stat Cards ───────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.stat-card .stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--text-primary);
  line-height: 1;
}

.stat-card .stat-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.stat-card.accent-card {
  background: var(--accent);
  border-color: transparent;
}

.stat-card.accent-card .stat-label,
.stat-card.accent-card .stat-value,
.stat-card.accent-card .stat-sub {
  color: rgba(255,255,255,0.9);
}

/* ── Tables ───────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead th {
  background: var(--bg-hover);
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--divider);
  color: var(--text-primary);
  vertical-align: middle;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-hover); }

/* ── Badges ───────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger  { background: var(--danger-bg);  color: var(--danger); }
.badge-info    { background: var(--info-bg);    color: var(--info); }
.badge-gray    { background: var(--bg-hover);   color: var(--text-muted); }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition);
  font-family: var(--font-body);
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: var(--text-on-accent);
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn-secondary:hover { background: var(--bg-hover); }

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger);
}
.btn-danger:hover { background: var(--danger); color: #fff; }

.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Form Elements ────────────────────────────────────────── */
.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.6rem 0.9rem;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border var(--transition), box-shadow var(--transition);
  appearance: none;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px hsl(var(--accent-hue), 85%, 55%, 0.15);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-control { cursor: pointer; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* ── Modal ────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  transform: translateY(16px) scale(0.97);
  transition: transform var(--transition);
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-close {
  background: var(--bg-hover);
  border: none;
  border-radius: var(--radius-sm);
  width: 30px; height: 30px;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
}

.modal-close:hover { background: var(--danger-bg); color: var(--danger); }

/* ── Sidebar Overlay (mobile) ─────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 190;
}

/* ── Toast ────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 9999;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.25s ease;
  max-width: 320px;
}

.toast-visible { opacity: 1; transform: translateY(0); }
.toast-success { background: var(--success); color: #fff; }
.toast-error   { background: var(--danger); color: #fff; }
.toast-warning { background: var(--warning); color: #fff; }
.toast-info    { background: var(--accent); color: #fff; }

/* ── Theme Switcher ───────────────────────────────────────── */
.theme-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 1rem;
}

.theme-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.toggle {
  width: 40px; height: 22px;
  border-radius: 999px;
  background: var(--border-strong);
  position: relative;
  cursor: pointer;
  border: none;
  transition: background var(--transition);
}

.toggle.active { background: var(--accent); }

.toggle::after {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  background: #fff;
  border-radius: 50%;
  top: 3px; left: 3px;
  transition: transform var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle.active::after { transform: translateX(18px); }

.accent-swatches {
  display: flex;
  gap: 8px;
}

.swatch {
  width: 24px; height: 24px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.swatch.active { border-color: var(--text-primary); transform: scale(1.15); }

.swatch-blue   { background: hsl(220, 85%, 55%); }
.swatch-violet { background: hsl(258, 85%, 55%); }
.swatch-teal   { background: hsl(172, 65%, 45%); }
.swatch-rose   { background: hsl(346, 85%, 55%); }
.swatch-amber  { background: hsl(38, 85%, 55%); }

/* ── Auth Pages ───────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  background: var(--bg-page);
}

.auth-card {
  width: 100%;
  max-width: 420px;
}

.auth-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-logo .logo-icon {
  width: 52px; height: 52px;
  background: var(--accent);
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 24px;
  margin-bottom: 1rem;
}

.auth-logo h1 { font-size: 1.75rem; margin-bottom: 0.25rem; }
.auth-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-top: 1px solid var(--border);
}

/* ── Landing Page ─────────────────────────────────────────── */
.landing-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
}

[data-theme="dark"] .landing-nav {
  background: rgba(15,17,23,0.85);
}

.landing-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 4rem;
}

.landing-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  margin-bottom: 1.25rem;
  line-height: 1.1;
}

.hero-accent { color: var(--accent); }

.landing-hero p {
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 2rem;
  color: var(--text-secondary);
}

.landing-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.feature-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }

/* ── Empty State ──────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 1rem; display: block; }
.empty-state h3 { color: var(--text-secondary); margin-bottom: 0.5rem; }

/* ── Loading Spinner ──────────────────────────────────────── */
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-page);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9000;
  flex-direction: column;
  gap: 1rem;
}

/* ── Tabs ─────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-hover);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.tab {
  flex: 1;
  padding: 0.5rem 1rem;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: var(--font-body);
}

.tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* ── Grade Color Helpers ──────────────────────────────────── */
.grade-A { color: var(--success); font-weight: 700; }
.grade-B { color: var(--info); font-weight: 700; }
.grade-C { color: var(--warning); font-weight: 700; }
.grade-D { color: #f97316; font-weight: 700; }
.grade-F { color: var(--danger); font-weight: 700; }

/* ── Search Bar ───────────────────────────────────────────── */
.search-bar {
  position: relative;
}
.search-bar input {
  padding-left: 2.25rem;
}
.search-bar .search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
  pointer-events: none;
}

/* ── Section Divider ──────────────────────────────────────── */
.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}

/* ── Progress Bar ─────────────────────────────────────────── */
.progress-bar {
  height: 6px;
  background: var(--bg-hover);
  border-radius: 999px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.5s ease;
}
.progress-fill.success { background: var(--success); }
.progress-fill.warning { background: var(--warning); }
.progress-fill.danger  { background: var(--danger); }

/* ── Alert ────────────────────────────────────────────────── */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
.alert-danger  { background: var(--danger-bg);  color: var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); }
.alert-warning { background: var(--warning-bg); color: var(--warning); }
.alert-info    { background: var(--info-bg);    color: var(--info); }

/* ── Responsive Breakpoints ───────────────────────────────── */
@media (max-width: 768px) {
  :root { --sidebar-w: 0px; }

  .sidebar {
    transform: translateX(-240px);
    width: 240px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay { display: block; }

  .hamburger { display: block; }

  .main-content { margin-left: 0; }

  .page-content { padding: 1.25rem 1rem; }

  .form-row { grid-template-columns: 1fr; }

  .stat-grid { grid-template-columns: repeat(2, 1fr); }

  .page-header { flex-direction: column; }

  .page-header .btn { width: 100%; justify-content: center; }

  .landing-nav { padding: 0 1rem; }

  .features-grid { padding: 2rem 1rem; }

  .topbar { padding: 0 1rem; }
}

@media (max-width: 480px) {
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .tabs { flex-wrap: wrap; }
  .modal { padding: 1.25rem; }
  .btn-lg { width: 100%; justify-content: center; }
}

/* ── Animations ───────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.3s ease forwards; }

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-12px); }
  to   { opacity: 1; transform: translateX(0); }
}

.slide-in { animation: slideIn 0.25s ease forwards; }