/* =========================================================
   Student Exam Performance Indicator — shared stylesheet
   Theme: "the study desk at night" — ink-navy surfaces,
   a warm grade-gold accent, a cool data-teal accent.
   ========================================================= */

:root {
  --bg: #0a0f1c;
  --bg-elevated: #10182c;
  --bg-elevated-2: #141f38;
  --ink: #e9edf7;
  --ink-muted: #8b96b6;
  --ink-faint: #5c6688;
  --gold: #f2b84b;
  --gold-soft: rgba(242, 184, 75, 0.14);
  --teal: #57e2c9;
  --teal-soft: rgba(87, 226, 201, 0.14);
  --line: rgba(233, 237, 247, 0.09);
  --line-strong: rgba(233, 237, 247, 0.16);
  --shadow-deep: 0 30px 60px -20px rgba(0, 0, 0, 0.55);
  --radius: 18px;
  --radius-sm: 10px;
  --font-display: "Fraunces", "Iowan Old Style", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
  overflow-x: hidden;
}

a {
  color: inherit;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
  opacity: 0.55;
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(680px circle at 15% 12%, rgba(242, 184, 75, 0.10), transparent 60%),
    radial-gradient(760px circle at 88% 78%, rgba(87, 226, 201, 0.10), transparent 60%);
}

.page {
  position: relative;
  z-index: 1;
}

/* ---------- Nav ---------- */

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px clamp(20px, 4vw, 40px) 0;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--gold);
  transform: rotate(45deg);
  flex: none;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.nav-link {
  font-size: 0.92rem;
  color: var(--ink-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--ink);
  border-color: var(--line-strong);
}

/* ---------- Hero (index.html) ---------- */

.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(48px, 9vw, 108px) clamp(20px, 4vw, 40px) 64px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero-copy h1 {
  font-family: var(--font-display);
  font-weight: 620;
  font-size: clamp(2.5rem, 5.2vw, 3.7rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  max-width: 12ch;
}

.hero-copy p {
  color: var(--ink-muted);
  font-size: 1.08rem;
  max-width: 46ch;
  margin: 0 0 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 14px 26px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.96rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), background 0.25s ease, border-color 0.25s ease;
}

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

.btn-primary {
  background: var(--gold);
  color: #241705;
}

.btn-primary:hover {
  transform: translateY(-2px);
  background: #f7c667;
}

.btn-ghost {
  color: var(--ink-muted);
  border-color: var(--line-strong);
}

.btn-ghost:hover {
  color: var(--ink);
  border-color: var(--ink-faint);
}

.hero-stats {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 40px) 90px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.stat {
  background: var(--bg-elevated);
  padding: 26px clamp(18px, 3vw, 30px);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.9rem;
  color: var(--gold);
}

.stat-label {
  color: var(--ink-muted);
  font-size: 0.88rem;
  margin-top: 4px;
}

/* ---------- Tilted report-card mockup ---------- */

.tilt-stage {
  perspective: 1400px;
}

.report-card {
  transform-style: preserve-3d;
  transform: rotateX(8deg) rotateY(-14deg);
  background: linear-gradient(155deg, var(--bg-elevated-2), var(--bg-elevated));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-deep);
  transition: transform 0.15s ease-out;
  will-change: transform;
}

.report-card__eyebrow {
  color: var(--ink-faint);
  font-size: 0.78rem;
  margin: 0 0 16px;
}

.report-card__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.report-card__row:first-of-type {
  border-top: none;
}

.report-card__row b {
  color: var(--ink);
  font-weight: 600;
}

.report-card__score {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.report-card__score-value {
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--teal);
}

.report-card__score-label {
  color: var(--ink-muted);
  font-size: 0.85rem;
}

/* ---------- Predictor layout (home.html) ---------- */

.predictor {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 56px) clamp(20px, 4vw, 40px) 100px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.85fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.predictor-header {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px clamp(20px, 4vw, 40px) 0;
}

.predictor-header h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 3.4vw, 2.5rem);
  margin: 4px 0 8px;
}

.predictor-header p {
  color: var(--ink-muted);
  max-width: 56ch;
  margin: 0;
}

.form-card {
  transform-style: preserve-3d;
  background: linear-gradient(160deg, var(--bg-elevated-2), var(--bg-elevated));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: clamp(22px, 3vw, 34px);
  box-shadow: var(--shadow-deep);
  transition: transform 0.15s ease-out;
  will-change: transform;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field.full {
  grid-column: 1 / -1;
}

.field label {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.field select,
.field input[type="number"] {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(233, 237, 247, 0.04);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.field select {
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-muted) 50%),
    linear-gradient(135deg, var(--ink-muted) 50%, transparent 50%);
  background-position: calc(100% - 20px) center, calc(100% - 15px) center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.field select:focus-visible,
.field input:focus-visible {
  outline: none;
  border-color: var(--teal);
  background-color: rgba(87, 226, 201, 0.06);
}

.field select option {
  background: var(--bg-elevated);
  color: var(--ink);
}

.score-field {
  position: relative;
}

.score-value {
  position: absolute;
  right: 14px;
  top: 38px;
  font-size: 0.82rem;
  color: var(--teal);
  pointer-events: none;
}

.submit-row {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.submit-btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 14px 30px;
  background: var(--gold);
  color: #241705;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.96rem;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), background 0.25s ease;
}

.submit-btn:hover {
  transform: translateY(-2px);
  background: #f7c667;
}

.submit-btn[data-loading="true"] {
  opacity: 0.75;
  pointer-events: none;
}

.submit-note {
  color: var(--ink-faint);
  font-size: 0.84rem;
}

/* ---------- Result panel ---------- */

.result-panel {
  position: sticky;
  top: 28px;
  perspective: 1600px;
}

.result-card {
  position: relative;
  width: 100%;
  min-height: 340px;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.result-card[data-revealed="true"] {
  transform: rotateY(180deg);
}

.result-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--shadow-deep);
}

.result-face--front {
  background: linear-gradient(160deg, var(--bg-elevated-2), var(--bg-elevated));
}

.result-face--back {
  background: linear-gradient(160deg, #12281f, #0d1a1b);
  transform: rotateY(180deg);
  text-align: center;
  align-items: center;
}

.result-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--teal-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.result-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--teal);
}

.result-face--front h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  margin: 0 0 10px;
}

.result-face--front p {
  color: var(--ink-muted);
  font-size: 0.92rem;
  margin: 0;
}

.result-back-label {
  color: var(--ink-muted);
  font-size: 0.85rem;
  margin: 0 0 6px;
}

.result-back-value {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--teal);
  line-height: 1;
}

.result-back-suffix {
  color: var(--ink-faint);
  font-size: 0.9rem;
  margin-top: 6px;
}

.result-back-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.82rem;
  max-width: 32ch;
}

/* ---------- Footer ---------- */

.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px clamp(20px, 4vw, 40px) 40px;
  color: var(--ink-faint);
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .tilt-stage {
    order: -1;
  }

  .report-card {
    transform: rotateX(4deg) rotateY(-6deg);
    max-width: 380px;
  }

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

  .result-panel {
    position: static;
  }
}

@media (max-width: 620px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}