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

:root {
  --bg: #0e0d0b;
  --bg2: #161512;
  --bg3: #1e1c18;
  --border: rgba(255,255,255,0.07);
  --border2: rgba(255,255,255,0.14);
  --text: #e8e4da;
  --muted: rgba(232,228,218,0.45);
  --faint: rgba(232,228,218,0.18);
  --accent: #c4a96e;
  --ff-display: 'Cormorant Garamond', serif;
  --ff-mono: 'DM Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-display);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* grain overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1000;
  opacity: 0.6;
}

/* ——— Header ——— */
header {
  padding: 5rem 4rem 4rem;
  max-width: 900px;
  border-bottom: 1px solid var(--border);
}

.header-label {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2rem;
}

header h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

header h1 em {
  font-style: italic;
  color: var(--accent);
}

header p {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 540px;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

/* Key */
.key {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--border);
}

.key-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.key-item svg { flex-shrink: 0; }

/* ——— Main layout ——— */
.container {
  display: grid;
  grid-template-columns: 1fr 380px;
  min-height: calc(100vh - 340px);
}

/* ——— Grid ——— */
.grid-section {
  padding: 3rem 4rem;
  border-right: 1px solid var(--border);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.emotion-card {
  background: var(--bg);
  padding: 1.75rem 1.5rem 1.5rem;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
  animation: fadeUp 0.4s ease both;
}

.emotion-card:hover {
  background: var(--bg2);
}

.emotion-card.active {
  background: var(--bg3);
}

.emotion-card.active::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 2px; height: 100%;
  background: var(--accent);
}

.symbol-area {
  width: 100%;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 1rem;
}

.symbol-area svg {
  overflow: visible;
}

.card-name {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  margin-bottom: 4px;
  color: var(--text);
}

.card-hint {
  font-family: var(--ff-mono);
  font-size: 9.5px;
  color: var(--muted);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

/* ——— Detail panel ——— */
.detail-section {
  padding: 3rem 2.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: none;
}

.detail-section::-webkit-scrollbar { display: none; }

.detail-empty {
  color: var(--faint);
  font-style: italic;
  font-size: 1rem;
  margin-top: 2rem;
  line-height: 1.8;
}

.detail-symbol {
  width: 100%;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}

.detail-name {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.detail-name-hint {
  font-family: var(--ff-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.detail-description {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.85;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}

.grammar-block {
  margin-bottom: 1.25rem;
}

.grammar-label {
  font-family: var(--ff-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 4px;
}

.grammar-value {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.6;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}

.tag {
  font-family: var(--ff-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border: 1px solid var(--border2);
  color: var(--muted);
}

/* ——— Footer ——— */
footer {
  padding: 2rem 4rem;
  border-top: 1px solid var(--border);
  font-family: var(--ff-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: var(--faint);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ——— Responsive ——— */
@media (max-width: 860px) {
  header { padding: 3rem 1.5rem 2.5rem; }
  .container { grid-template-columns: 1fr; }
  .grid-section { padding: 2rem 1.5rem; border-right: none; }
  .detail-section { position: static; height: auto; padding: 2rem 1.5rem; border-top: 1px solid var(--border); }
  footer { padding: 1.5rem; }
}

/* ——— Animations ——— */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.detail-inner {
  animation: fadeUp 0.25s ease both;
}