/* ── Hero ── */
    .hero-section {
      padding: clamp(4rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 5rem);
      min-height: calc(100vh - var(--nav-height));
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: clamp(2rem, 6vw, 4rem);
      align-items: center;
    }
    .hero-label {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--ui-fg-muted);
      margin-bottom: var(--gap-lg);
      border-left: 2px solid var(--ui-fg);
      padding-left: var(--gap-sm);
    }
    .hero-title {
      font-family: var(--font-serif);
      font-size: clamp(2.5rem, 6vw, 4.5rem);
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.05;
      margin-bottom: var(--gap-lg);
    }
    .hero-subtitle {
      font-size: clamp(0.95rem, 1.5vw, 1.125rem);
      color: var(--ui-fg-muted);
      margin-bottom: var(--gap-xl);
      max-width: 480px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      gap: var(--gap-sm);
      flex-wrap: wrap;
    }
    .hero-visual {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-block {
      width: 100%;
      aspect-ratio: 1;
      border: var(--ui-border) solid var(--ui-line);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: clamp(1.5rem, 4vw, 2rem);
      text-align: center;
      position: relative;
    }
    .hero-block::before {
      content: '';
      position: absolute;
      top: -6px; left: -6px;
      width: 28px; height: 28px;
      border-top: 2px solid var(--ui-fg);
      border-left: 2px solid var(--ui-fg);
    }
    .hero-block::after {
      content: '';
      position: absolute;
      bottom: -6px; right: -6px;
      width: 28px; height: 28px;
      border-bottom: 2px solid var(--ui-fg);
      border-right: 2px solid var(--ui-fg);
    }
    .hero-block .hb-char {
      font-family: var(--font-serif);
      font-size: clamp(3rem, 8vw, 6rem);
      font-weight: 900;
      line-height: 1;
      letter-spacing: 0.08em;
    }
    .hero-block .hb-sub {
      font-family: var(--font-mono);
      font-size: clamp(0.6rem, 1vw, 0.7rem);
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--ui-fg-muted);
      margin-top: var(--gap-md);
    }

    /* ── Breathing Sections ── */
    .section-breath {
      padding: clamp(3rem, 8vw, 5rem) 0;
    }

    /* ── Society Grid ── */
    .society-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
      gap: 1px;
      background: var(--ui-line);
      border: var(--ui-border) solid var(--ui-line);
    }
    .society-cell {
      background: var(--ui-bg);
      padding: var(--gap-lg) var(--gap-md);
      text-align: center;
      font-size: 0.85rem;
      font-weight: 500;
      letter-spacing: 0.02em;
      transition: background var(--dur-fast) var(--ease-out);
    }
    .society-cell:hover {
      background: var(--ui-surface);
    }

    /* ── Contest Cards ── */
    .contests-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: var(--gap-md);
    }

    /* ── Feature Cards ── */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: var(--gap-md);
    }
    .feature-card {
      border: var(--ui-border) solid var(--ui-line);
      padding: var(--gap-xl);
      background: var(--ui-bg);
      transition: all var(--dur-base) var(--ease-out);
      transform: translateY(0);
    }
    .feature-card:hover {
      border-color: var(--ui-line-hover);
      transform: translateY(-2px);
    }
    .feature-icon {
      font-size: 1.5rem;
      margin-bottom: var(--gap-md);
    }
    .feature-card h3 {
      font-size: 1rem;
      margin-bottom: var(--gap-sm);
      font-weight: 600;
    }
    .feature-card p {
      font-size: 0.825rem;
      color: var(--ui-fg-muted);
      margin-bottom: 0;
      line-height: 1.6;
    }

    /* ── Section Label ── */
    .section-label {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--ui-fg-muted);
      margin-bottom: var(--gap-sm);
    }

    .loading-placeholder {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: var(--gap-2xl);
      color: var(--ui-fg-muted);
      font-family: var(--font-mono);
      font-size: 0.8rem;
    }

    /* ═══ Responsive ═══ */

    /* Tablet */
    @media (max-width: 1024px) {
      .contests-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
      .feature-grid { grid-template-columns: repeat(2, 1fr); }
    }

    /* Mobile */
    @media (max-width: 768px) {
      .hero-section { padding: clamp(2.5rem, 7vw, 4rem) 0 clamp(2rem, 5vw, 3rem); min-height: auto; }
      .hero-grid { grid-template-columns: 1fr; gap: var(--gap-xl); }
      .hero-visual { order: -1; max-width: 200px; margin: 0 auto; }
      .hero-block { aspect-ratio: auto; padding: var(--gap-2xl) var(--gap-lg); }
      .hero-block::before, .hero-block::after { width: 18px; height: 18px; }
      .contests-grid { grid-template-columns: 1fr; }
      .feature-grid { grid-template-columns: 1fr; }
      .society-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
      .section-breath { padding: clamp(1.5rem, 5vw, 2.5rem) 0; }
      .container { padding: 0 var(--gap-md); }
      .contest-card { padding: var(--gap-lg); }
      .contest-card .contest-name { font-size: 1.2rem; }
    }

    @media (max-width: 480px) {
      .hero-title { font-size: clamp(1.6rem, 8vw, 2rem); }
      .hero-actions { flex-direction: column; }
      .hero-actions .btn { width: 100%; justify-content: center; }
      .society-grid { grid-template-columns: repeat(3, 1fr); }
      .society-cell { padding: var(--gap-md) var(--gap-xs); font-size: .72rem; }
      .hero-visual { max-width: 150px; }
      .feature-card { padding: var(--gap-lg); }
      .feature-card h3 { font-size: .9rem; }
      .feature-card p { font-size: .75rem; }
    }