:root {
  /* Primary blue scale — a real tint/shade ramp from #2970EC. Tints (50-500) blend toward
     white; shades (700-950) blend toward the app's sidebar navy, so --color-primary-950 IS
     that navy (one fewer arbitrary color in the system). */
  --color-primary-50:  #F6F9FE;
  --color-primary-100: #EAF1FD;
  --color-primary-200: #D0E0FB;
  --color-primary-300: #AEC9F8;
  --color-primary-400: #7AA6F3;
  --color-primary-500: #4B87EF;
  --color-primary-600: #2970EC;
  --color-primary-700: #225CC0;
  --color-primary-800: #1C4C9D;
  --color-primary-900: #163975;
  --color-primary-950: #0F1F3D;

  --color-primary: var(--color-primary-600);
  --color-primary-dark: var(--color-primary-800);
  --color-primary-rgb: 41, 112, 236;

  --color-accent: #a8441c;
  --color-accent-dark: #833516;
  --color-accent-rgb: 168, 68, 28;
  --color-bg: #f6f8fb;
  --color-card: #ffffff;
  --color-text: #1e242f;
  --color-muted: #5a6372;
  --color-border: #dee3ed;
  --color-success: #15803d;
  --color-success-rgb: 21, 128, 61;
  --color-warning: #d97706;
  --color-danger: #dc2626;
  --color-danger-rgb: 220, 38, 38;
  --color-admin-accent: #6d4fe0;
  --color-admin-accent-dark: #5637c4;
  --color-admin-accent-rgb: 109, 79, 224;
  --color-teal-rgb: 13, 125, 120;
  --color-pink-rgb: 171, 47, 110;
  --nav-active-ondark: var(--color-primary-500);
  --sidebar-student-bg: var(--color-primary-950);
  --sidebar-admin-bg: #161226;

  --gradient-primary: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-800));
  --gradient-accent: linear-gradient(135deg, #c4552a, var(--color-accent-dark));
  --gradient-success: linear-gradient(135deg, #22a355, #0e6b30);
  --gradient-warning: linear-gradient(135deg, #f0a63e, #b8630a);
  --gradient-danger: linear-gradient(135deg, #e6544f, #b41f1f);
  --gradient-admin: linear-gradient(135deg, #8a6ef0, var(--color-admin-accent-dark));
  --gradient-teal: linear-gradient(135deg, #1cc4b8, #0d7d78);
  --gradient-pink: linear-gradient(135deg, #ec5aa0, #ab2f6e);

  --radius: 13px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(15,35,70,0.10), 0 1px 2px rgba(15,35,70,0.06);
  --shadow-hover: 0 12px 28px rgba(15,35,70,0.14), 0 3px 8px rgba(15,35,70,0.08);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

/* ===== Fade-up entrance animations ===== */
.reveal { opacity: 1; transform: none; }
html.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
html.js .reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-group > .reveal:nth-child(2) { transition-delay: 0.08s; }
.reveal-group > .reveal:nth-child(3) { transition-delay: 0.16s; }
.reveal-group > .reveal:nth-child(4) { transition-delay: 0.24s; }
.reveal-group > .reveal:nth-child(5) { transition-delay: 0.32s; }
.reveal-group > .reveal:nth-child(6) { transition-delay: 0.4s; }
@media (prefers-reduced-motion: reduce) {
  html.js .reveal { opacity: 1; transform: none; transition: none; }
}

/* ===== Ripple click effect (interactive elements only) ===== */
.js-ripple { position: relative; overflow: hidden; }
.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.55);
  transform: scale(0);
  animation: rippleAnim 0.6s var(--ease);
  pointer-events: none;
}
.js-ripple.ripple-dark .ripple-effect { background: rgba(var(--color-primary-rgb), 0.18); }
@keyframes rippleAnim { from { transform: scale(0); opacity: 1; } to { transform: scale(2.6); opacity: 0; } }

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}
h1, h2 { letter-spacing: -0.01em; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.small { font-size: 0.85rem; color: var(--color-muted); }
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.btn-row form { display: flex; margin: 0; }

/* ===== Public site header ===== */
.site-header { background: var(--color-card); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; }
.brand { font-size: 1.25rem; font-weight: 700; color: var(--color-text) !important; text-decoration: none !important; }
.brand span { color: var(--color-primary); }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--color-text); }
.site-nav { display: flex; align-items: center; gap: 20px; }
.site-nav a { display: inline-flex; align-items: center; gap: 7px; color: var(--color-text); font-weight: 500; }
.site-nav a:hover { color: var(--color-primary); text-decoration: none; }
.site-nav a.btn-nav { background: var(--gradient-primary); color: #fff !important; padding: 8px 16px; border-radius: var(--radius); box-shadow: 0 3px 8px rgba(var(--color-primary-rgb),0.22); }
.site-nav a.btn-nav:hover { filter: brightness(1.08); }
.site-footer { background: var(--color-card); border-top: 1px solid var(--color-border); padding: 20px 16px; text-align: center; color: var(--color-muted); font-size: 0.85rem; }

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--color-card); border-bottom: 1px solid var(--color-border); flex-direction: column; align-items: flex-start; gap: 0; padding: 8px 16px 16px; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 10px 0; width: 100%; }
}

.main-content { min-height: calc(100vh - 140px); padding: 32px 16px 48px; }

/* ===== Hero ===== */
.hero { text-align: center; padding: 56px 16px 32px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -180px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 500px;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--color-primary) 12%, transparent), transparent);
  z-index: 0; pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(1.75rem, 4.2vw, 2.6rem); margin-bottom: 10px; letter-spacing: -0.01em; }
.hero p { color: var(--color-muted); font-size: 1.08rem; max-width: 580px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.eyebrow { display: inline-block; background: var(--color-primary-100); color: var(--color-primary-800); font-weight: 700; font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase; padding: 6px 14px; border-radius: 999px; margin-bottom: 14px; }

.section-block { max-width: 1080px; margin: 0 auto; padding: 40px 16px; }
.section-divider { border-top: 1px solid var(--color-border); margin: 28px 0 20px; padding-top: 20px; }

/* ===== Grade grid ===== */
.grade-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 16px; max-width: 700px; margin: 32px auto 0; }
.grade-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 20px; text-align: center; box-shadow: var(--shadow); transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease), border-color 0.2s var(--ease); }
.grade-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c7d7f2; }
.grade-card .num { width: 56px; height: 56px; margin: 0 auto 10px; border-radius: 50%; color: #fff; font-size: 1.5rem; font-weight: 700; display: flex; align-items: center; justify-content: center; }
.num-blue { background: var(--gradient-primary); box-shadow: 0 4px 10px rgba(var(--color-primary-rgb),0.22); }
.num-green { background: var(--gradient-success); box-shadow: 0 4px 10px rgba(var(--color-success-rgb),0.22); }
.num-purple { background: var(--gradient-admin); box-shadow: 0 4px 10px rgba(var(--color-admin-accent-rgb),0.25); }
.num-orange { background: var(--gradient-accent); box-shadow: 0 4px 10px rgba(var(--color-accent-rgb),0.22); }
.num-teal { background: var(--gradient-teal); box-shadow: 0 4px 10px rgba(var(--color-teal-rgb),0.25); }
.num-pink { background: var(--gradient-pink); box-shadow: 0 4px 10px rgba(var(--color-pink-rgb),0.25); }

/* ===== Card system (shared surface + semantic variants) ===== */
.surface, .card, .feature-card, .class-card, .testimonial-card, .subject-card, .lesson-card,
.step-card, .stat-tile, .print-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease), border-color 0.2s var(--ease);
}
.card { padding: 24px; margin-bottom: 20px; }
.card-narrow { max-width: 460px; margin-left: auto; margin-right: auto; position: relative; overflow: hidden; }
.card-narrow::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient-primary); }
.card:hover, .feature-card:hover, .class-card:hover, .testimonial-card:hover, .subject-card:hover,
.lesson-card:hover, .step-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: #c7d7f2; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.feature-card { padding: 24px; }
.feature-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1.4rem; margin-bottom: 14px; background: var(--gradient-primary); box-shadow: 0 4px 10px rgba(var(--color-primary-rgb),0.22); }
.feature-icon-blue { background: var(--gradient-primary); box-shadow: 0 4px 10px rgba(var(--color-primary-rgb),0.22); }
.feature-icon-green { background: var(--gradient-success); box-shadow: 0 4px 10px rgba(var(--color-success-rgb),0.22); }
.feature-icon-purple { background: var(--gradient-admin); box-shadow: 0 4px 10px rgba(var(--color-admin-accent-rgb),0.22); }
.feature-icon-orange { background: var(--gradient-accent); box-shadow: 0 4px 10px rgba(var(--color-accent-rgb),0.22); }
.feature-icon-teal { background: var(--gradient-teal); box-shadow: 0 4px 10px rgba(var(--color-teal-rgb),0.22); }
.feature-icon-pink { background: var(--gradient-pink); box-shadow: 0 4px 10px rgba(var(--color-pink-rgb),0.22); }

.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.step-card { padding: 24px; text-align: center; }
.step-num { width: 44px; height: 44px; border-radius: 50%; background: var(--gradient-primary); color: #fff; font-weight: 700; font-size: 1.2rem; display: flex; align-items: center; justify-content: center; margin: 0 auto 12px; }

/* ===== Carousel (scroll-snap, no JS library) ===== */
.carousel-wrap { position: relative; padding: 0 44px; }
.carousel-track {
  display: flex; gap: 16px; overflow-x: auto; scroll-snap-type: x mandatory; scroll-behavior: smooth;
  padding: 4px 4px 14px;
}
@media (prefers-reduced-motion: reduce) { .carousel-track { scroll-behavior: auto; } }
.carousel-track::-webkit-scrollbar { height: 6px; }
.carousel-track::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 999px; }
.carousel-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); width: 38px; height: 38px; border-radius: 50%;
  background: var(--color-card); border: 1px solid var(--color-border); box-shadow: var(--shadow);
  display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--color-primary); z-index: 2;
}
.carousel-arrow-prev { left: 0; }
.carousel-arrow-next { right: 0; }
@media (max-width: 720px) { .carousel-arrow { display: none; } .carousel-wrap { padding: 0; } }

.class-card { width: 270px; flex: 0 0 auto; scroll-snap-align: start; padding: 20px; }
.testimonial-card { width: 300px; flex: 0 0 auto; scroll-snap-align: start; padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.testimonial-rating { color: #f5a623; letter-spacing: 2px; }
.testimonial-quote { flex: 1; color: var(--color-text); }
.testimonial-author { display: flex; align-items: center; gap: 10px; }
.testimonial-author-name { font-weight: 700; }
.testimonial-author-role { font-size: 0.8rem; color: var(--color-muted); }

.cta-card { text-align: center; padding: 40px 24px; background: linear-gradient(135deg, #eff6ff, #dbeafe); border-color: #c7d7f2; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--gradient-primary); color: #fff; border: none; padding: 11px 20px; border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem; cursor: pointer; box-shadow: 0 3px 8px rgba(var(--color-primary-rgb),0.2);
  transition: filter 0.15s, box-shadow 0.15s, transform 0.1s; text-decoration: none !important;
}
.btn:hover { filter: brightness(1.08); color: #fff; box-shadow: 0 5px 14px rgba(var(--color-primary-rgb),0.3); }
.btn:active { transform: scale(0.98); }
.btn-block { width: 100%; }
.btn-sm { padding: 7px 14px; font-size: 0.85rem; }
.btn-secondary { background: var(--gradient-accent); box-shadow: 0 3px 8px rgba(var(--color-accent-rgb),0.2); }
.btn-secondary:hover { box-shadow: 0 5px 14px rgba(var(--color-accent-rgb),0.3); }
.btn-danger { background: var(--gradient-danger); box-shadow: 0 3px 8px rgba(var(--color-danger-rgb),0.22); }
.btn-danger:hover { box-shadow: 0 5px 14px rgba(var(--color-danger-rgb),0.3); }
.btn-outline { background: transparent; color: var(--color-primary); border: 1.5px solid var(--color-primary); box-shadow: none; }
.btn-outline:hover { background: var(--color-primary-50); color: var(--color-primary); filter: none; }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; filter: none; }

/* ===== Badges ===== */
.badge { display: inline-flex; align-items: center; gap: 5px; font-size: 0.78rem; font-weight: 700; padding: 4px 11px; border-radius: 999px; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-muted { background: #f3f4f6; color: #4b5563; }
.nav-badge { background: var(--color-danger); color: #fff; font-size: 0.7rem; font-weight: 700; padding: 1px 7px; border-radius: 999px; margin-left: auto; }

/* ===== Alerts ===== */
.alert { padding: 13px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 0.92rem; }
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-info { background: var(--color-primary-100); color: var(--color-primary-800); }
.alert-warning { background: #fef3c7; color: #92400e; }

/* ===== Forms ===== */
.form-group { margin-bottom: 16px; flex: 1; min-width: 0; }
.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 6px; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="date"], input[type="month"], input[type="file"], input[type="color"], input[type="tel"],
select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-size: 0.95rem; font-family: inherit; background: #fff; color: var(--color-text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb),0.18); }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232970EC' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; background-size: 16px; padding-right: 36px; }
.hint { font-size: 0.78rem; color: var(--color-muted); margin-top: 4px; }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--color-border); }
th { font-weight: 700; color: var(--color-muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }

.empty-state { text-align: center; padding: 48px 20px; color: var(--color-muted); }
.empty-icon { font-size: 2.2rem; color: var(--color-border); margin-bottom: 12px; }

/* ===== App shell (sidebar layout, shared by student + admin) ===== */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 250px; flex-shrink: 0; background: var(--sidebar-student-bg); color: #fff;
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.sidebar-admin { background: var(--sidebar-admin-bg); }
.sidebar-brand { display: flex; align-items: center; justify-content: space-between; padding: 20px 18px; font-size: 1.15rem; font-weight: 700; }
.sidebar-brand a { color: #fff !important; text-decoration: none !important; }
.sidebar-brand span { color: var(--nav-active-ondark); }
.sidebar-close { display: none; background: none; border: none; color: #fff; font-size: 1.2rem; cursor: pointer; }
.sidebar-user { display: flex; align-items: center; gap: 10px; padding: 0 18px 18px; }
.sidebar-user-name { font-weight: 600; font-size: 0.92rem; }
.sidebar-user-id { font-size: 0.75rem; color: rgba(255,255,255,0.6); }
.sidebar-nav { display: flex; flex-direction: column; padding: 6px 10px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.78) !important; font-size: 0.92rem; font-weight: 500; text-decoration: none !important;
  transition: background-color 0.15s;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: #fff !important; }
.nav-item.active { background: rgba(255,255,255,0.14); color: #fff !important; }
.sidebar-footer { padding: 10px; border-top: 1px solid rgba(255,255,255,0.1); }
.sidebar-backdrop { display: none; }

.app-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.app-topbar { display: flex; align-items: center; justify-content: space-between; padding: 14px 24px; background: var(--color-card); border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 50; }
.sidebar-toggle { display: none; background: none; border: none; font-size: 1.3rem; cursor: pointer; color: var(--color-text); }
.topbar-title { font-size: 1.2rem; margin: 0; }
.topbar-user { display: flex; align-items: center; gap: 10px; }
.app-content { padding: 24px; flex: 1; }

@media (max-width: 900px) {
  .sidebar { position: fixed; left: -270px; z-index: 200; transition: left 0.2s var(--ease); }
  .sidebar.open { left: 0; }
  .sidebar-close { display: block; }
  .sidebar-toggle { display: block; }
  .sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 150; }
  .sidebar-backdrop.open { display: block; }
}

/* ===== Avatars ===== */
.avatar {
  width: 40px; height: 40px; border-radius: 50%; background: var(--gradient-primary); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.9rem; flex-shrink: 0; overflow: hidden;
}
.avatar img { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; }
.avatar-admin { background: var(--gradient-admin); }
.avatar-sm { width: 32px; height: 32px; font-size: 0.78rem; }
.avatar-lg { width: 64px; height: 64px; font-size: 1.3rem; }
.avatar-xl { width: 88px; height: 88px; font-size: 1.8rem; }
.student-id-tag { display: inline-block; background: var(--color-primary-100); color: var(--color-primary-800); font-weight: 700; font-size: 0.78rem; padding: 3px 10px; border-radius: 999px; }

/* ===== Dashboard / course cards ===== */
.dash-head { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-tile { padding: 20px; display: flex; flex-direction: column; gap: 4px; }
a.stat-tile { text-decoration: none !important; color: inherit; }
.stat-tile-icon { width: 40px; height: 40px; border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; margin-bottom: 8px; background: var(--gradient-primary); }
.stat-tile-primary .stat-tile-icon { background: var(--gradient-primary); }
.stat-tile-success .stat-tile-icon { background: var(--gradient-success); }
.stat-tile-warning .stat-tile-icon { background: var(--gradient-warning); }
.stat-tile-accent .stat-tile-icon { background: var(--gradient-accent); }
.stat-tile .val { font-size: 1.6rem; font-weight: 700; }
.stat-tile .lbl { font-size: 0.82rem; color: var(--color-muted); }

@media (max-width: 600px) {
  .stat-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; }
  .stat-grid > .stat-tile { scroll-snap-align: start; flex: 0 0 82%; }
}

.subject-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 18px; }
.subject-card { padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.subject-card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.subject-price { font-weight: 700; }

.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.dot-success { background: var(--color-success); }
.dot-locked { background: var(--color-border); }

.lock-banner { background: #fffbeb; border: 1px solid #fde68a; border-radius: var(--radius); padding: 20px; text-align: center; margin-bottom: 20px; }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin-bottom: 24px; }
.lesson-card { display: flex; flex-direction: column; overflow: hidden; }
.video-embed { position: relative; padding-top: 56.25%; background: #000; }
.video-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.lesson-body { padding: 16px; flex: 1; display: flex; flex-direction: column; gap: 8px; }
.type-tag { display: inline-block; align-self: flex-start; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; padding: 3px 10px; border-radius: 999px; }
.type-video { background: #ede9fe; color: #5b21b6; }
.type-zoom { background: #e0f2fe; color: #075985; }
.locked-wrap { position: relative; }
.lesson-locked { filter: blur(2px); pointer-events: none; user-select: none; }
.lock-pill { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; gap: 8px; background: rgba(255,255,255,0.75); font-weight: 700; color: var(--color-muted); }
.lesson-complete-row { margin-top: 8px; }
.btn-complete-done { background: var(--gradient-success); box-shadow: 0 3px 8px rgba(var(--color-success-rgb),0.22); }

.material-strip { margin-top: 6px; }
.material-thumb { width: 90px; flex: 0 0 auto; scroll-snap-align: start; display: flex; flex-direction: column; gap: 4px; text-decoration: none !important; }
.material-thumb img { width: 100%; height: 64px; object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.material-thumb-icon { width: 100%; height: 64px; display: flex; align-items: center; justify-content: center; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-size: 1.4rem; color: var(--color-muted); }
.material-thumb-name { font-size: 0.7rem; color: var(--color-muted); text-align: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.material-thumb:hover .material-thumb-name { color: var(--color-primary); }

.material-list { display: flex; flex-wrap: wrap; gap: 10px; padding: 10px 0; }
.material-chip { display: flex; align-items: center; gap: 8px; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 999px; padding: 4px 6px 4px 4px; }
.material-chip-thumb { width: 28px; height: 28px; border-radius: 50%; overflow: hidden; display: flex; align-items: center; justify-content: center; background: var(--color-card); flex-shrink: 0; }
.material-chip-thumb img { width: 100%; height: 100%; object-fit: cover; }
.material-name { font-size: 0.8rem; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.assignment-card { padding: 20px; }
.assignment-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.month-tabs { display: flex; gap: 8px; overflow-x: auto; margin-bottom: 20px; }
.month-tab { display: flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 999px; background: var(--color-card); border: 1px solid var(--color-border); font-size: 0.85rem; font-weight: 600; color: var(--color-text) !important; text-decoration: none !important; flex-shrink: 0; }
.month-tab.active { background: var(--gradient-primary); color: #fff !important; border-color: transparent; }

/* ===== Toggle switch ===== */
.switch { position: relative; display: inline-flex; width: 46px; height: 26px; flex-shrink: 0; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; z-index: 1; }
.switch-track { position: absolute; inset: 0; background: var(--color-border); border-radius: 999px; transition: background-color 0.2s ease; pointer-events: none; }
.switch-thumb { position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.25); transition: transform 0.2s ease; }
.switch input:checked ~ .switch-track { background: var(--color-primary); }
.switch input:checked ~ .switch-track .switch-thumb { transform: translateX(20px); }
.switch-row { display: flex; align-items: center; gap: 12px; }
.switch-row-label { font-weight: 600; }

/* ===== Attendance QR scan overlay ===== */
.scanner-wrap { position: relative; }
#reader { border-radius: var(--radius); overflow: hidden; }
.scan-result-overlay {
  position: absolute; inset: 0; z-index: 20; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 8px; padding: 20px; text-align: center; border-radius: var(--radius);
  background: #fff; animation: scanOverlayIn 0.15s ease;
}
@keyframes scanOverlayIn { from { opacity: 0; } to { opacity: 1; } }
.scan-result-overlay.is-success { background: #f0fdf4; }
.scan-result-overlay.is-dup { background: #fffbeb; }
.scan-result-overlay.is-fail { background: #fef2f2; }
.scan-result-icon { font-size: 4.2rem; line-height: 1; }
.scan-result-overlay.is-success .scan-result-icon { color: var(--color-success); animation: scanPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.scan-result-overlay.is-dup .scan-result-icon { color: #92400e; animation: scanPop 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.scan-result-overlay.is-fail .scan-result-icon { color: var(--color-danger); animation: scanShake 0.4s ease; }
@keyframes scanPop { 0% { transform: scale(0); opacity: 0; } 60% { transform: scale(1.15); opacity: 1; } 100% { transform: scale(1); } }
@keyframes scanShake { 0%,100% { transform: translateX(0); } 20% { transform: translateX(-8px); } 40% { transform: translateX(8px); } 60% { transform: translateX(-5px); } 80% { transform: translateX(5px); } }
.scan-result-avatar { margin-top: 4px; }
.scan-result-overlay h3 { font-size: 1.3rem; margin: 4px 0 0; }
.scan-result-message { font-weight: 600; margin: 2px 0 0; }
.scan-result-overlay.is-success .scan-result-message { color: var(--color-success); }
.scan-result-overlay.is-dup .scan-result-message { color: #92400e; }
.scan-result-overlay.is-fail .scan-result-message { color: var(--color-danger); }
.scan-feed { display: flex; flex-direction: column; gap: 10px; max-height: 520px; overflow-y: auto; }
.scan-feed-item { display: flex; align-items: center; gap: 10px; padding: 10px; border-radius: var(--radius-sm); background: var(--color-bg); }
.scan-feed-ok .icon { color: var(--color-success); }
.scan-feed-dup .icon { color: #92400e; }
.scan-feed-err .icon { color: var(--color-danger); }
.scan-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .scan-grid { grid-template-columns: 1fr; } }

/* ===== Profile ===== */
.profile-hero-grid { display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; }
@media (max-width: 640px) { .profile-hero-grid { grid-template-columns: 1fr; text-align: center; } }
.profile-identity { display: flex; align-items: center; gap: 18px; }
@media (max-width: 640px) { .profile-identity { flex-direction: column; } }
.qr-display { display: flex; align-items: center; justify-content: center; padding: 10px; background: #fff; border-radius: var(--radius-sm); }
.profile-photo-edit { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.profile-photo-edit input[type="file"] { max-width: 260px; }

/* ===== ID card ===== */
.id-card { width: 330px; margin: 0 auto 40px; border-radius: var(--radius); box-shadow: var(--shadow-hover); overflow: hidden; background: #fff; text-align: center; }
.id-card-header { color: #fff; padding: 18px 16px 44px; }
.id-card-header h1 { font-size: 1.05rem; margin: 0; font-weight: 700; letter-spacing: .3px; }
.id-card-header .sub { font-size: .75rem; opacity: .9; margin-top: 2px; }
.id-card-photo { width: 96px; height: 96px; border-radius: 50%; margin: -40px auto 0; border: 4px solid #fff; box-shadow: 0 2px 8px rgba(0,0,0,.2); overflow: hidden; background: var(--sidebar-student-bg); display: flex; align-items: center; justify-content: center; font-size: 1.6rem; font-weight: 700; color: #fff; }
.id-card-photo img { width: 100%; height: 100%; object-fit: cover; }
.id-card-body { padding: 12px 20px 24px; }
.id-card-name { font-size: 1.15rem; font-weight: 700; margin: 6px 0 0; }
.id-card-meta { color: var(--color-muted); font-size: .85rem; margin-top: 6px; }
.id-card-qr { margin-top: 18px; padding-top: 18px; border-top: 1px dashed var(--color-border); }
@media print { .print-actions { display: none; } .id-card { box-shadow: none; border: 1px solid var(--color-border); } }

/* ===== Charts (admin overview) ===== */
.chart-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 18px; margin-bottom: 20px; }
.chart-row { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.doughnut-wrap { position: relative; }
.doughnut-center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.dc-value { font-size: 1.4rem; font-weight: 700; }
.dc-label { font-size: 0.75rem; color: var(--color-muted); }
.chart-legend { list-style: none; margin: 0; padding: 0; flex: 1; min-width: 160px; }
.chart-legend li { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; padding: 4px 0; }
.legend-swatch { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.bar-list { display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: grid; grid-template-columns: 120px 1fr 70px; align-items: center; gap: 10px; font-size: 0.85rem; }
.bar-track { height: 10px; background: var(--color-bg); border-radius: 999px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 999px; }