/* =========================
   Science Theme (2026)
   تصميم جديد بالكامل لمادة العلوم
========================= */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+Arabic:wght@400;600;700&family=Cairo:wght@500;700;800&display=swap');

:root {
  color-scheme: dark;

  --primary: #2563eb;
  --primary-2: #60a5fa;
  --primary-dark: #1d4ed8;
  --primary-rgb: 37, 99, 235;

  --accent: #22c55e;
  --accent-2: #86efac;
  --accent-rgb: 34, 197, 94;

  --spark: #a855f7;
  --spark-rgb: 168, 85, 247;

  --info: #38bdf8;
  --warning: #f59e0b;
  --danger: #fb7185;
  --success: #22c55e;

  --bg-1: #040815;
  --bg-2: #020617;

  --surface: rgba(2, 6, 23, 0.74);
  --surface-solid: #020617;

  --ink: #e2e8f0;
  --muted: #94a3b8;

  --border: rgba(148, 163, 184, 0.16);

  --shadow-1: 0 14px 40px rgba(0, 0, 0, 0.38);
  --shadow-2: 0 26px 76px rgba(0, 0, 0, 0.50);

  --radius-lg: 26px;
  --radius-md: 20px;
  --radius-sm: 14px;

  --ring: 0 0 0 4px rgba(var(--primary-rgb), 0.22);
}

:root[data-theme="light"] {
  color-scheme: light;

  --primary: #2563eb;
  --primary-2: #3b82f6;
  --primary-dark: #1d4ed8;
  --primary-rgb: 37, 99, 235;

  --accent: #16a34a;
  --accent-2: #86efac;
  --accent-rgb: 22, 163, 74;

  --spark: #7c3aed;
  --spark-rgb: 124, 58, 237;

  --info: #0284c7;
  --warning: #b45309;
  --danger: #e11d48;
  --success: #16a34a;

  --bg-1: #eff6ff;
  --bg-2: #ffffff;

  --surface: rgba(255, 255, 255, 0.94);
  --surface-solid: #ffffff;

  --ink: #0f172a;
  --muted: #475569;

  --border: rgba(15, 23, 42, 0.12);

  --shadow-1: 0 14px 38px rgba(15, 23, 42, 0.08);
  --shadow-2: 0 30px 70px rgba(15, 23, 42, 0.12);

  --ring: 0 0 0 4px rgba(var(--primary-rgb), 0.18);
}

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

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  line-height: 1.7;
  color: var(--ink);
  font-family: 'IBM Plex Sans Arabic', system-ui, -apple-system, "Segoe UI", Arial, sans-serif;

  background:
    radial-gradient(1100px 560px at 12% 4%, rgba(var(--primary-rgb), 0.22), transparent 60%),
    radial-gradient(980px 540px at 92% 10%, rgba(var(--accent-rgb), 0.18), transparent 62%),
    radial-gradient(820px 520px at 55% 95%, rgba(var(--spark-rgb), 0.18), transparent 60%),
    linear-gradient(180deg, var(--bg-1), var(--bg-2));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.14;

  background-image: url("assets/science-pattern.svg");
  background-size: 720px 720px;
  background-position: 50% 0;
}

:root[data-theme="light"] body::before {
  opacity: 0.08;
  background-image: url("assets/science-pattern.svg");
}

header,
.container,
footer {
  position: relative;
  z-index: 1;
}

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-family: 'Cairo', 'IBM Plex Sans Arabic', system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
}

.muted {
  color: var(--muted);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

.empty-state {
  margin-top: 18px;
  color: var(--muted);
  text-align: center;
  font-weight: 800;
}

/* =========================
   Header
========================= */

.app-header {
  position: sticky;
  top: 12px;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;

  width: min(1120px, calc(100% - 24px));
  margin: 12px auto 0;

  padding: 12px 14px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: var(--shadow-1);

  background:
    linear-gradient(135deg,
      rgba(var(--primary-rgb), 0.16),
      rgba(var(--spark-rgb), 0.10),
      rgba(var(--accent-rgb), 0.12)
    ),
    rgba(2, 6, 23, 0.56);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

:root[data-theme="light"] .app-header {
  box-shadow: var(--shadow-1);
  background:
    linear-gradient(135deg,
      rgba(var(--primary-rgb), 0.10),
      rgba(var(--spark-rgb), 0.06),
      rgba(var(--accent-rgb), 0.08)
    ),
    rgba(255, 255, 255, 0.78);
}

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

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  color: white;
  background:
    radial-gradient(18px 18px at 30% 25%, rgba(255, 255, 255, 0.38), transparent 55%),
    linear-gradient(135deg, var(--primary), var(--spark), var(--accent));
  border: 1px solid rgba(var(--primary-rgb), 0.30);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.30);
  transform: rotate(-6deg);
}

.brand-glyph {
  font-family: 'Cairo', 'IBM Plex Sans Arabic', system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  transform: rotate(6deg) translateY(-1px);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.2px;
}

.brand-sub {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
}

.header-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 12px;
}

.header-info > div {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(226, 232, 240, 0.06);
  color: var(--muted);
}

:root[data-theme="light"] .header-info > div {
  background: rgba(15, 23, 42, 0.04);
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

/* =========================
   Containers + Typography
========================= */

.container {
  max-width: 1140px;
  margin: 26px auto;
  padding: clamp(18px, 3vw, 34px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.container h2 {
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 900;
  margin-bottom: 12px;
}

.container h3 {
  font-size: 18px;
  font-weight: 900;
  margin: 18px 0 10px;
}

.container h4 {
  font-size: 16px;
  font-weight: 900;
  margin: 14px 0 8px;
}

/* =========================
   Home (Hero / Sections)
========================= */

.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 18px;
  align-items: start;
}

.hero-main {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(var(--primary-rgb), 0.20);
  background:
    radial-gradient(900px 420px at 0% 0%, rgba(var(--primary-rgb), 0.22), transparent 62%),
    radial-gradient(760px 420px at 100% 100%, rgba(var(--spark-rgb), 0.18), transparent 58%),
    var(--surface);
  padding: 18px;
  box-shadow: var(--shadow-1);
}

.hero-title {
  font-size: clamp(26px, 3.2vw, 40px);
  font-weight: 900;
  letter-spacing: 0.2px;
  margin-bottom: 10px;
}

.hero-lead {
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 12px;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 14px;
}

.pill {
  padding: 6px 10px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 13px;
  border: 1px solid rgba(var(--primary-rgb), 0.28);
  background:
    linear-gradient(135deg, rgba(var(--primary-rgb), 0.14), rgba(var(--spark-rgb), 0.10), rgba(var(--accent-rgb), 0.10));
  color: var(--ink);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin: 14px 0 0;
}

.card {
  text-align: center;
  padding: 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background:
    radial-gradient(420px 180px at 50% 0%, rgba(var(--primary-rgb), 0.18), transparent 70%),
    var(--surface);
  box-shadow: var(--shadow-1);
  font-weight: 800;
}

:root[data-theme="light"] .card {
  background:
    radial-gradient(420px 180px at 50% 0%, rgba(var(--primary-rgb), 0.14), transparent 70%),
    var(--surface);
  box-shadow: var(--shadow-1);
}

.card span {
  display: block;
  margin-top: 8px;
  font-size: 30px;
  color: var(--primary-2);
  font-weight: 900;
}

.hero-side {
  display: grid;
  gap: 14px;
}

.panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background:
    radial-gradient(520px 220px at 100% 0%, rgba(var(--accent-rgb), 0.14), transparent 58%),
    radial-gradient(520px 220px at 0% 100%, rgba(var(--spark-rgb), 0.12), transparent 60%),
    var(--surface);
  padding: 14px;
}

:root[data-theme="light"] .panel {
  background:
    radial-gradient(520px 220px at 100% 0%, rgba(var(--accent-rgb), 0.10), transparent 58%),
    radial-gradient(520px 220px at 0% 100%, rgba(var(--spark-rgb), 0.08), transparent 60%),
    var(--surface);
}

.panel-experiment {
  border-style: dashed;
  border-color: rgba(var(--accent-rgb), 0.32);
}

.experiment-steps {
  margin: 10px 18px 0;
  display: grid;
  gap: 6px;
  color: var(--ink);
  font-weight: 700;
}

.experiment-note {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 14px;
  border: 1px solid rgba(251, 113, 133, 0.24);
  background: rgba(251, 113, 133, 0.12);
  color: var(--ink);
  font-weight: 800;
  font-size: 13px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.panel-title {
  font-weight: 900;
  font-size: 15px;
}

.panel-badge {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(var(--accent-rgb), 0.30);
  background: rgba(var(--accent-rgb), 0.12);
  font-weight: 900;
  font-size: 13px;
}

.tip-card {
  padding: 12px 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--accent-rgb), 0.26);
  background: rgba(var(--accent-rgb), 0.10);
}

.tip-title {
  font-weight: 900;
  margin-bottom: 6px;
}

.tip-text {
  color: var(--muted);
  font-weight: 700;
}

.grade-cards {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.grade-card {
  text-align: right;
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--primary-rgb), 0.30);
  background: linear-gradient(135deg, var(--primary), var(--spark), var(--accent));
  color: #fff;
  padding: 14px 14px;
  box-shadow: none;
}

.grade-card:hover {
  filter: brightness(1.03);
}

.grade-card-title {
  font-weight: 900;
  font-size: 16px;
  margin-bottom: 2px;
}

.grade-card-sub {
  color: rgba(255, 255, 255, 0.86);
  font-weight: 700;
  font-size: 13px;
}

.section {
  margin-top: 18px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.section-title {
  margin: 0;
}

/* =========================
   Features
========================= */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature {
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--primary-rgb), 0.18);
  background:
    radial-gradient(520px 220px at 100% 0%, rgba(var(--primary-rgb), 0.16), transparent 60%),
    radial-gradient(520px 220px at 0% 100%, rgba(var(--accent-rgb), 0.12), transparent 62%),
    var(--surface);
  padding: 14px;
}

.feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 22px;
  background:
    radial-gradient(14px 14px at 30% 25%, rgba(255, 255, 255, 0.34), transparent 55%),
    linear-gradient(135deg, rgba(var(--primary-rgb), 0.22), rgba(var(--spark-rgb), 0.12), rgba(var(--accent-rgb), 0.18));
  border: 1px solid var(--border);
  margin-bottom: 10px;
}

:root[data-theme="light"] .feature-icon {
  background: rgba(255, 255, 255, 0.80);
}

.feature-title {
  font-weight: 900;
  margin-bottom: 4px;
}

.feature-text {
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

/* =========================
   Tools
========================= */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.tool-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background:
    radial-gradient(520px 220px at 100% 0%, rgba(var(--primary-rgb), 0.16), transparent 60%),
    radial-gradient(520px 220px at 0% 100%, rgba(var(--spark-rgb), 0.12), transparent 62%),
    var(--surface);
  padding: 14px;
}

.tool-title {
  font-weight: 900;
  margin-bottom: 10px;
}

.tool-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tool-row-2 {
  grid-template-columns: 1fr 1fr;
}

.tool-row-split {
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

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

.tool-sep {
  font-weight: 900;
  color: var(--muted);
  padding: 0 4px;
}

.tool-result {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(var(--primary-rgb), 0.34);
  background: rgba(var(--primary-rgb), 0.10);
  color: var(--ink);
  font-weight: 900;
  min-height: 44px;
  display: grid;
  align-items: center;
}

.challenge-box {
  margin-top: 10px;
  padding: 12px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(var(--accent-rgb), 0.22);
  background: rgba(var(--accent-rgb), 0.08);
  font-weight: 900;
  min-height: 72px;
  display: grid;
  gap: 10px;
  align-items: start;
}

.challenge-q {
  font-weight: 900;
}

.challenge-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.challenge-option {
  width: 100%;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(var(--primary-rgb), 0.22);
  background: rgba(8, 18, 26, 0.44);
  color: var(--ink);
  font-size: 14px;
  box-shadow: none;
}

:root[data-theme="light"] .challenge-option {
  background: rgba(255, 255, 255, 0.90);
}

.challenge-option:hover {
  filter: brightness(1.03);
}

.challenge-option.is-selected {
  border-color: rgba(var(--primary-rgb), 0.55);
  box-shadow: var(--ring);
}

.challenge-option.is-correct {
  border-color: rgba(34, 197, 94, 0.40);
  background: rgba(34, 197, 94, 0.12);
}

.challenge-option.is-wrong {
  border-color: rgba(251, 113, 133, 0.40);
  background: rgba(251, 113, 133, 0.12);
}

.challenge-explain {
  color: var(--muted);
  font-weight: 700;
}

/* =========================
   Buttons / Toolbar
========================= */

button {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(var(--primary-rgb), 0.30);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-size: 15px;
  font-weight: 900;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
}

button:hover {
  filter: brightness(1.03);
}

button:active {
  transform: translateY(1px);
}

button:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.top-btn {
  padding: 10px 12px;
  border-radius: 999px;
  font-size: 14px;
  box-shadow: none;
}

.top-btn-ghost {
  background: rgba(226, 232, 240, 0.06);
  border: 1px solid var(--border);
  color: var(--ink);
}

.top-btn-ghost:hover {
  background: rgba(226, 232, 240, 0.10);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-sm {
  padding: 8px 12px;
  border-radius: 12px;
  font-size: 14px;
  margin: 3px;
}

.btn-secondary {
  background: rgba(226, 232, 240, 0.06);
  color: var(--ink);
  border: 1px solid var(--border);
  box-shadow: none;
}

.btn-secondary:hover {
  background: rgba(226, 232, 240, 0.10);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #fb7185);
  border-color: rgba(239, 68, 68, 0.35);
  box-shadow: 0 12px 28px rgba(239, 68, 68, 0.18);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
  box-shadow: none;
}

.btn-ghost:hover {
  background: rgba(226, 232, 240, 0.06);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 12px;
}

.toolbar button {
  margin: 0;
}

.row-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* =========================
   Inputs
========================= */

label {
  display: block;
  margin-top: 12px;
  font-weight: 900;
}

input,
select,
textarea {
  width: 100%;
  padding: 12px 12px;
  margin: 8px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(8, 18, 26, 0.62);
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

:root[data-theme="light"] input,
:root[data-theme="light"] select,
:root[data-theme="light"] textarea {
  background: rgba(255, 255, 255, 0.96);
}

input::placeholder,
textarea::placeholder {
  color: rgba(148, 163, 184, 0.85);
}

:root[data-theme="light"] input::placeholder,
:root[data-theme="light"] textarea::placeholder {
  color: rgba(71, 85, 105, 0.85);
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: rgba(var(--primary-rgb), 0.55);
  box-shadow: var(--ring);
}

.field-invalid {
  border-color: rgba(239, 68, 68, 0.95) !important;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.16) !important;
  background: rgba(127, 29, 29, 0.18) !important;
}

:root[data-theme="light"] .field-invalid {
  background: rgba(254, 226, 226, 0.96) !important;
}

#questionsContainer .exam.field-invalid-block {
  border-color: rgba(239, 68, 68, 0.7);
  box-shadow: 0 14px 28px rgba(127, 29, 29, 0.22);
}

.tool-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.9;
}

/* =========================
   Exams list
========================= */

.filters {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 12px;
  margin: 12px 0 4px;
}

.filters input,
.filters select {
  margin: 0;
}

.exams {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.exam {
  background: rgba(15, 23, 42, 0.52);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.14);
  position: relative;
  overflow: hidden;
}

:root[data-theme="light"] .exam {
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.08);
}

.exam[onclick] {
  cursor: pointer;
}

.exam[onclick]:hover {
  filter: brightness(1.02);
  box-shadow: var(--shadow-2);
}

.exams .exam::before {
  content: "تمرين";
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(var(--primary-rgb), 0.90);
  color: white;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
  border: 1px solid rgba(var(--primary-rgb), 0.26);
}

.exam img {
  width: 100%;
  border-radius: 14px;
  margin-bottom: 10px;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(148, 163, 184, 0.14);
}

.exam-meta {
  margin-top: 6px;
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
}

.exam > div:first-of-type {
  font-weight: 900;
  font-size: 16px;
}

/* =========================
   Exam (student)
========================= */

#questionsArea .exam {
  margin-bottom: 14px;
}

#questionsArea p {
  margin: 10px 0;
  font-size: 16px;
  font-weight: 800;
}

#questionsArea img {
  border-radius: 14px;
  margin: 10px 0 6px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  object-fit: contain;
  max-height: 360px;
  background: rgba(226, 232, 240, 0.04);
}

#questionsArea label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  margin-top: 8px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(226, 232, 240, 0.05);
  cursor: pointer;
  user-select: none;
}

.answer-option.is-selected {
  border-color: rgba(var(--primary-rgb), 0.55);
  box-shadow: var(--ring);
  background: rgba(var(--primary-rgb), 0.08);
}

#questionsArea input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--info);
}

.review-item {
  border-right: 6px solid rgba(148, 163, 184, 0.24);
}

.review-item.is-correct {
  border-right-color: var(--success);
}

.review-item.is-wrong {
  border-right-color: var(--danger);
}

.answer-correct {
  color: var(--success);
  font-weight: 900;
}

.exam-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  flex-wrap: wrap;
}

.exam-status {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.status-chip {
  padding: 8px 10px;
  border-radius: 999px;
  font-weight: 900;
  font-size: 13px;
  background: rgba(var(--primary-rgb), 0.10);
  border: 1px solid rgba(var(--primary-rgb), 0.20);
  color: var(--ink);
}

.progress-bar {
  height: 10px;
  border-radius: 999px;
  background: rgba(226, 232, 240, 0.06);
  border: 1px solid rgba(148, 163, 184, 0.18);
  overflow: hidden;
  margin: 10px 0 12px;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.2s ease;
}

/* =========================
   Images / Drop areas
========================= */

.image-option {
  width: 160px;
  border-radius: 16px;
  cursor: pointer;
  border: 2px solid transparent;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.18);
}

.image-preview {
  width: 160px;
  display: none;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.question-preview {
  width: 100%;
  margin-top: 10px;
  display: none;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(226, 232, 240, 0.04);
}

#dropArea, .drop-area {
  border: 2px dashed rgba(148, 163, 184, 0.30);
  padding: 18px;
  margin-top: 12px;
  border-radius: var(--radius-md);
  color: var(--muted);
  background: rgba(226, 232, 240, 0.04);
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease;
  cursor: pointer;
  position: relative;
  font-weight: 900;
}

.drop-area.drop-area-compact {
  padding: 12px;
  font-size: 14px;
}

.drop-area input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#dropArea.is-dragover, .drop-area.is-dragover {
  border-color: rgba(var(--primary-rgb), 0.80);
  background: rgba(var(--primary-rgb), 0.10);
}

/* =========================
   Tables
========================= */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(226, 232, 240, 0.03);
  margin-top: 14px;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.14);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0;
}

th {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: 12px;
  text-align: right;
  font-weight: 900;
}

td {
  padding: 12px 10px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}

tr:hover td {
  background: rgba(var(--primary-rgb), 0.06);
}

#leaderboardPage th,
#leaderboardPage td,
#teachersPage th,
#teachersPage td,
#analyticsPage th,
#analyticsPage td {
  text-align: center;
}

#leaderboardPage td:first-child {
  font-size: 18px;
  font-weight: 900;
}

table button {
  margin: 0;
}

/* =========================
   Charts
========================= */

.chart-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 14px;
  margin-top: 12px;
}

.chart-card {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(226, 232, 240, 0.05);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.14);
  padding: 14px;
}

.chart-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 10px;
}

.chart-head h3 {
  margin: 0;
}

.chart-head .muted {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.chart-body {
  height: 320px;
}

.chart-body canvas {
  width: 100% !important;
  height: 100% !important;
}

.stats.stats-compact .card {
  padding: 16px;
  font-size: 16px;
}

.stats.stats-compact .card span {
  font-size: 26px;
}

/* =========================
   Result
========================= */

#resultPage {
  text-align: center;
  font-size: 18px;
}

#resultText {
  margin: 18px 0;
  font-size: 20px;
  font-weight: 900;
  color: var(--primary-2);
  white-space: pre-line;
}

.result-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 14px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(226, 232, 240, 0.05);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.14);
  margin: 10px 0 14px;
  text-align: right;
}

.result-badge.is-excellent {
  border-color: rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.12);
}

.result-badge.is-good {
  border-color: rgba(var(--primary-rgb), 0.35);
  background: rgba(var(--primary-rgb), 0.10);
}

.result-badge.is-keepgoing {
  border-color: rgba(245, 158, 11, 0.40);
  background: rgba(245, 158, 11, 0.10);
}

.result-badge.is-tryagain {
  border-color: rgba(239, 68, 68, 0.30);
  background: rgba(239, 68, 68, 0.08);
}

.result-badge .badge-icon {
  width: 44px;
  height: 44px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 22px;
  background: rgba(226, 232, 240, 0.08);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.result-badge .badge-title {
  font-weight: 900;
  line-height: 1.2;
}

.result-badge .badge-sub {
  color: var(--muted);
  font-weight: 800;
  margin-top: 2px;
}

/* =========================
   Footer
========================= */

.site-footer {
  text-align: center;
  padding: 22px 14px 30px;
  color: var(--muted);
}

.footer-inner {
  display: grid;
  gap: 10px;
  place-items: center;
}

.footer-note {
  font-size: 13px;
  font-weight: 700;
}

/* =========================
   Responsive
========================= */

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .feature-grid-4 {
    grid-template-columns: 1fr;
  }

  .chart-grid {
    grid-template-columns: 1fr;
  }

  .chart-body {
    height: 280px;
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: 14px 14px;
  }

  .container {
    margin: 18px 12px;
    padding: 18px;
  }

  .filters {
    grid-template-columns: 1fr;
  }

  .exams {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}