@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;700&display=swap');
@font-face {
  font-family: 'Hanley Pro Sans';
  src: url('assets/Hanley Pro Sans.otf') format('opentype');
  font-weight: normal;
  font-style: normal;
}

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

:root {
  --bg:            #f4f7f9;
  --surface:       #3C899B;
  --border:        #ccd8e0;
  --accent:        #3C899B;
  --accent-dim:    rgba(60, 137, 155, 0.15);
  --accent-glow:   rgba(60, 137, 155, 0.25);
  --highlight:     #FAC132;
  --hover-deep:    #073153;
  --text:          #2d3f4e;
  --text-dim:      #c2c2c2;
  --text-bright:   #ffffff;
  --success:       #00ff80;
  --success-dim:   #d4f0e4;
  --card-back:     #e8f3f6;
  --card-front:    #ffffff;
  --surface-hover: #073153;
  --danger:        #e05555;
  --radius:        8px;
  --flip-dur:      0.55s;
}

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Montserrat', sans-serif;
  min-height: 100vh;
  line-height: 1.6;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('assets/Widescreen no elements.png') center / cover;
  z-index: -1;
}

/* ── Header ─────────────────────────────────────────────── */
header {
  background: rgba(0, 0, 0, 0.7);
  padding: 2.5rem 2rem 2rem;
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  color: white;
}

h1 {
  font-family: 'Hanley Pro Sans', sans-serif;
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 span {
  color: var(--highlight);
}

.header-sub {
  margin-top: 0.6rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

.header-sub p + p {
  margin-top: 0.3rem;
}

/* ── Main ───────────────────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ── Chapter ────────────────────────────────────────────── */
.chapter {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.chapter.complete {
  border-color: var(--success);
}

.chapter-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  background: var(--surface);
  border-left: 3px solid transparent;
  transition: background 0.2s, border-color 0.2s;
}

.chapter-header:hover {
  background: var(--surface-hover);
  border-left-color: var(--highlight);
}

.chapter-chevron {
  color: white;
  font-size: 0.75rem;
  transition: transform 0.3s;
  flex-shrink: 0;
}

.chapter.open .chapter-chevron { transform: rotate(90deg); }

.chapter-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-bright);
  flex: 1;
  color: white;
}

.chapter-progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.progress-bar-wrap {
  width: 90px;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--success);
  border-radius: 2px;
  transition: width 0.4s ease, background 0.4s;
}

.chapter.complete .progress-bar { background: var(--success); }

.progress-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  min-width: 48px;
  text-align: right;
}

.chapter.complete .progress-label { color: var(--success); }

.complete-badge {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--success);
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.4s;
}

.chapter.complete .complete-badge { opacity: 1; }

/* ── Chapter body ───────────────────────────────────────── */
.chapter-body {
  display: none;
  padding: 1.25rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.chapter.open .chapter-body { display: block; }

/* ── Hint grid ──────────────────────────────────────────── */
.hint-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

/* ── Card flip ──────────────────────────────────────────── */
.hint-card {
  aspect-ratio: 3 / 4;
  perspective: 800px;
  cursor: pointer;
}

.hint-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--flip-dur) cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius);
}

.hint-card.flipped .hint-card-inner {
  transform: rotateY(180deg);
}

.hint-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 0.6rem;
  transition: border-color 0.3s, box-shadow 0.3s;
}

/* Locked card */
.hint-card.locked {
  cursor: not-allowed;
  opacity: 0.45;
}

.hint-card.locked .hint-back:hover {
  border-color: var(--border);
  box-shadow: none;
}

/* Back face (shown by default) */
.hint-back {
  background: var(--card-back);
}

.hint-back:hover {
  border-color: var(--highlight);
  box-shadow: 0 2px 8px rgba(250, 193, 50, 0.25);
}

.hint-number {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.hint-back-label {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 0.35rem;
}

/* Front face (shown when flipped) */
.hint-front {
  background: var(--card-front);
  transform: rotateY(180deg);
  flex-direction: column;
  justify-content: space-between;
  padding: 0.6rem 0.5rem 0.5rem;
}

.hint-card.flipped .hint-face { border-color: var(--accent); }
.hint-card.done .hint-face    { border-color: var(--success-dim); }
.hint-card.done.flipped .hint-face { border-color: var(--success); }

.hint-front-number {
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.15em;
  align-self: flex-start;
}

.hint-text {
  font-size: 0.78rem;
  color: var(--text);
  text-align: center;
  line-height: 1.5;
  flex: 1;
  padding: 0.35rem 0;
  word-break: break-word;
  overflow-wrap: break-word;
  overflow: hidden;
  width: 100%;
}

.hint-check-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  gap: 0.4rem;
  padding-top: 0.25rem;
}

.hint-check {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 5px;
  background: transparent;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background 0.2s, border-color 0.2s;
}

.hint-check:hover {
  border-color: var(--highlight);
}

.hint-check:checked {
  background: var(--success);
  border-color: var(--success);
}

.hint-check:checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 7px;
  height: 11px;
  border: 2.5px solid #ffffff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.hint-check-label {
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

/* ── Shimmer effect on header ───────────────────────────── */
@keyframes scanline {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(400%); }
}

header::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, rgba(250, 193, 50, 0.4), transparent);
  animation: scanline 6s linear infinite;
  pointer-events: none;
}

/* ── Loading / Error ────────────────────────────────────── */
.status-message {
  text-align: center;
  padding: 4rem 1rem;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.status-message.error { color: var(--danger); }

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.status-cursor {
  display: inline-block;
  animation: blink 1s step-start infinite;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 600px) {
  .hint-grid { grid-template-columns: repeat(2, 1fr); }
  .progress-bar-wrap { display: none; }
}