/* OWC Subject Hub — scoped from owc-subject-hub.html */
/* =========================================================
     OWC SUBJECT HUB — v2
     Restrained academic styling. Navy + Orange + neutrals only.
     Single sans-serif family. No display serif, no channel colors,
     no decorative gradients. Designed to feel solid and professional.
     ========================================================= */
  .owc-subject-hub {
    /* Brand */
    --navy: #0E245A;
    --navy-700: #1b3479;
    --navy-500: #2a4a9e;
    --orange: #EB7314;
    --orange-600: #d56510;
    --orange-100: #ffe1c7;

    /* Functional status colors (semantic, not decorative) */
    --status-green: #16a34a;
    --status-amber: #d97706;
    --status-grey:  #94a3b8;

    --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  }

  /* Dark theme (default) */
  html[data-theme="dark"] .owc-subject-hub {
    --bg: #0b0f1c;
    --bg-elev: #141a2b;
    --bg-elev-2: #1c2338;
    --border: #2a334d;
    --border-strong: #3a4564;
    --text: #ebeef5;
    --text-muted: #9aa3bc;
    --text-faint: #6b7390;
    --nav-bg: #0f1525;
    --orange-tint: rgba(235,115,20,.08);
  }
  /* Light theme */
  html[data-theme="light"] .owc-subject-hub {
    --bg: #f6f7fa;
    --bg-elev: #ffffff;
    --bg-elev-2: #f1f3f7;
    --border: #e2e5ec;
    --border-strong: #c8cdd8;
    --text: #15192a;
    --text-muted: #596179;
    --text-faint: #8a92a8;
    --nav-bg: #ffffff;
    --orange-tint: rgba(235,115,20,.06);
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
.owc-subject-hub {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
  .owc-subject-hub button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
  .owc-subject-hub a { color: inherit; text-decoration: none; }

  /* ============ NAV ============ */
  .topnav {
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    padding: 14px 32px;
    display: flex; align-items: center; gap: 28px;
    position: sticky; top: 0; z-index: 50;
  }
  .brand { display: flex; align-items: center; gap: 12px; }
  .brand-mark {
    width: 34px; height: 34px; border-radius: 6px;
    background: var(--navy);
    display: grid; place-items: center;
    color: #fff; font-weight: 700; font-size: 11px; letter-spacing: .4px;
  }
  .brand-text { font-weight: 700; font-size: 14px; letter-spacing: .5px; }
  .brand-text .brand-accent { color: var(--orange); }

  .topnav-links { display: flex; gap: 2px; flex: 1; justify-content: center; }
  .topnav-links a {
    padding: 8px 14px; font-size: 14px; font-weight: 500;
    color: var(--text-muted); border-radius: 6px;
    transition: color .12s, background .12s;
  }
  .topnav-links a:hover { color: var(--text); background: var(--bg-elev); }
  .topnav-links a.active { color: var(--orange); font-weight: 600; }

  .topnav-actions { display: flex; align-items: center; gap: 8px; }
  .icon-btn {
    width: 36px; height: 36px; border-radius: 6px;
    display: grid; place-items: center;
    color: var(--text-muted);
    transition: color .12s, background .12s;
    position: relative;
  }
  .icon-btn:hover { background: var(--bg-elev); color: var(--text); }
  .cart-count {
    position: absolute; top: -2px; right: -2px;
    background: var(--orange); color: #fff;
    font-size: 10px; font-weight: 700;
    min-width: 16px; height: 16px;
    border-radius: 8px; display: grid; place-items: center;
    padding: 0 4px;
  }
  .btn-cta {
    padding: 9px 16px; background: var(--orange); color: #fff;
    border-radius: 6px; font-weight: 600; font-size: 13.5px;
    transition: background .12s;
  }
  .btn-cta:hover { background: var(--orange-600); }
  .owc-subject-hub .btn-outline {
    padding: 9px 16px; color: var(--orange); font-weight: 600;
    border: 1px solid var(--orange); border-radius: 6px; font-size: 13.5px;
    transition: background .12s, color .12s;
    display: inline-block;
    text-decoration: none;
  }
  .owc-subject-hub .btn-outline:hover { background: var(--orange); color: #fff; }

  /* ============ BREADCRUMB ============ */
  .owc-subject-hub .breadcrumb {
    padding: 20px 48px 0;
    max-width: 1360px; margin: 0 auto;
    font-size: 13px; color: var(--text-faint);
    display: flex; align-items: center; gap: 8px;
  }
  .owc-subject-hub .breadcrumb a:hover { color: var(--text); }
  .owc-subject-hub .breadcrumb .sep { opacity: .5; }
  .owc-subject-hub .breadcrumb .current { color: var(--text-muted); font-weight: 500; }

  /* ============ SUBJECT SWITCHER ============ */
  .owc-subject-hub .subject-switcher {
    max-width: 1360px; margin: 16px auto 0;
    padding: 0 48px;
    display: flex; gap: 6px; flex-wrap: wrap;
  }
.owc-subject-hub .subject-chip {
    padding: 8px 14px; border-radius: 6px;
    background: var(--bg-elev); border: 1px solid var(--border);
    color: var(--text-muted); font-size: 13px; font-weight: 600;
    transition: color .12s, border-color .12s, background .12s;
    display: inline-flex; align-items: center; gap: 8px;
    text-decoration: none;
    cursor: pointer;
}
  .owc-subject-hub .subject-chip:hover { border-color: var(--border-strong); color: var(--text); }
  .owc-subject-hub .subject-chip.active {
    background: var(--navy); border-color: var(--navy);
    color: #fff;
  }
  .owc-subject-hub .subject-chip .count {
    font-size: 11px; font-weight: 700;
    padding: 2px 7px; border-radius: 10px;
    background: rgba(255,255,255,.15);
  }
  .owc-subject-hub .subject-chip:not(.active) .count {
    background: var(--bg-elev-2); color: var(--text-faint);
  }

  /* ============ HERO ============ */
  .owc-subject-hub .hero {
    max-width: 1360px; margin: 0 auto;
    padding: 36px 48px 28px;
  }
  .owc-subject-hub .hero-eyebrow {
    display: inline-block;
    font-size: 11px; font-weight: 700; letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 14px;
  }
  .owc-subject-hub .hero-title {
    font-size: clamp(32px, 4.5vw, 48px);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.15;
    margin-bottom: 14px;
    color: var(--text);
  }
  .owc-subject-hub .hero-title .accent { color: var(--orange); }
  .owc-subject-hub .hero-sub {
    font-size: 16px; color: var(--text-muted);
    max-width: 680px; line-height: 1.55;
    margin-bottom: 28px;
  }
  .owc-subject-hub .hero-stats {
    display: flex; gap: 36px; flex-wrap: wrap;
    padding-top: 22px; border-top: 1px solid var(--border);
  }
  .owc-subject-hub .stat .num {
    font-size: 26px; font-weight: 700;
    color: var(--text); line-height: 1;
    letter-spacing: -0.3px;
  }
  .owc-subject-hub .stat .num .unit {
    font-size: 14px; font-weight: 500;
    color: var(--text-faint);
    margin-left: 2px;
  }
  .owc-subject-hub .stat .label {
    font-size: 11px; color: var(--text-faint);
    text-transform: uppercase; letter-spacing: 1px;
    font-weight: 600; margin-top: 8px;
  }

  /* ============ SECTION HEADERS ============ */
  .owc-subject-hub .section {
    max-width: 1360px; margin: 0 auto;
    padding: 36px 48px;
  }
  .owc-subject-hub .section-head {
    display: flex; align-items: flex-end; justify-content: space-between;
    gap: 24px; margin-bottom: 24px; flex-wrap: wrap;
  }
  .owc-subject-hub .section-title {
    font-size: clamp(22px, 2.8vw, 28px);
    font-weight: 700;
    letter-spacing: -0.3px;
    line-height: 1.2;
    color: var(--text);
  }
  .owc-subject-hub .section-lead {
    font-size: 14px; color: var(--text-muted);
    max-width: 520px; line-height: 1.5;
    margin-top: 6px;
  }

  /* ============ CHANNEL CARDS ============ */
  .owc-subject-hub .channel-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
.owc-subject-hub .channel-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 26px;
    transition: border-color .12s, background .12s;
    cursor: pointer; text-align: left;
    display: flex; flex-direction: column;
    min-height: 220px;
    width: 100%;
    font: inherit;
    color: inherit;
    text-decoration: none;
}
  .owc-subject-hub .channel-card:hover {
    border-color: var(--border-strong);
    background: var(--bg-elev-2);
  }
  .owc-subject-hub .channel-top {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 18px;
  }
  .owc-subject-hub .channel-number {
    font-size: 11px; font-weight: 700;
    letter-spacing: 1.5px; text-transform: uppercase;
    color: var(--text-faint);
    flex: 1;
  }
  .owc-subject-hub .channel-popular {
    font-size: 10px; font-weight: 700;
    padding: 4px 8px; border-radius: 4px;
    background: var(--orange-tint);
    color: var(--orange);
    text-transform: uppercase; letter-spacing: .8px;
  }
  .owc-subject-hub .channel-title {
    font-size: 20px; font-weight: 700;
    letter-spacing: -0.2px; line-height: 1.3;
    margin-bottom: 10px;
    color: var(--text);
  }
  .owc-subject-hub .channel-desc {
    font-size: 13.5px; color: var(--text-muted);
    line-height: 1.55;
    flex: 1;
  }
  .owc-subject-hub .channel-foot {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; margin-top: 18px;
    padding-top: 16px; border-top: 1px solid var(--border);
  }
  .owc-subject-hub .channel-stat {
    font-size: 13px; color: var(--text-muted);
    font-weight: 500;
  }
  .owc-subject-hub .channel-stat strong { color: var(--text); font-weight: 700; }
  .owc-subject-hub .channel-cta {
    font-size: 13px; font-weight: 600;
    color: var(--orange);
  }

  /* ============ TUTOR CARDS ============ */
  .owc-subject-hub .tutor-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 16px;
  }
  .owc-subject-hub .tutor-card {
    background: var(--bg-elev);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 22px;
    display: flex; flex-direction: column;
    min-height: 320px;
    transition: border-color .12s;
  }
  .owc-subject-hub .tutor-card:hover { border-color: var(--border-strong); }

  .owc-subject-hub .tutor-top {
    display: flex; align-items: flex-start; justify-content: space-between;
    gap: 16px; margin-bottom: 14px;
  }
  .owc-subject-hub .tutor-top-left { flex: 1; min-width: 0; }
  .owc-subject-hub .tutor-teaching-label {
    font-size: 10px; font-weight: 700;
    letter-spacing: 1.2px; text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 8px;
  }
  .owc-subject-hub .tutor-teaching-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .owc-subject-hub .tutor-chip {
    font-size: 11px; font-weight: 600;
    padding: 3px 9px; border-radius: 4px;
    background: var(--bg-elev-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
  }
  .owc-subject-hub .tutor-chip.primary {
    background: var(--navy);
    color: #fff;
    border-color: var(--navy);
  }
  .owc-subject-hub .tutor-avatar {
    width: 52px; height: 52px; border-radius: 50%;
    flex-shrink: 0; position: relative;
    background: var(--navy);
    display: grid; place-items: center;
    color: #fff; font-weight: 700; font-size: 16px;
    letter-spacing: .4px;
    overflow: hidden;
  }
  .owc-subject-hub .tutor-avatar img {
    width: 100%; height: 100%;
    object-fit: cover;
  }
  .owc-subject-hub .tutor-avatar::after {
    content: ""; position: absolute;
    bottom: -1px; right: -1px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--status-green);
    border: 2.5px solid var(--bg-elev);
    z-index: 2;
  }
  .owc-subject-hub .tutor-avatar.limited::after { background: var(--status-amber); }
  .owc-subject-hub .tutor-avatar.offline::after { background: var(--status-grey); }

  .owc-subject-hub .tutor-name {
    font-size: 17px; font-weight: 700;
    color: var(--text); line-height: 1.3;
    margin-bottom: 4px;
  }
  .owc-subject-hub .tutor-specialization {
    font-size: 13px; color: var(--text);
    font-weight: 600; line-height: 1.45;
    margin-bottom: 4px;
  }
  .owc-subject-hub .tutor-specialization .spec-label {
    color: var(--text-muted); font-weight: 500;
  }
  .owc-subject-hub .tutor-experience {
    font-size: 12.5px; color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 12px;
  }
  .owc-subject-hub .tutor-credentials {
    font-size: 12px; color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 12px;
  }
  .owc-subject-hub .tutor-bio {
    font-size: 12.5px; color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 14px;
  }
  .owc-subject-hub .tutor-bio:empty { display: none; }

  .owc-subject-hub .tutor-footer {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px;
  }
  .owc-subject-hub .tutor-availability {
    font-size: 12px;
    display: flex; align-items: center; gap: 7px;
    flex-wrap: wrap;
    flex: 1;
    min-width: 0;
  }
  .owc-subject-hub .tutor-stars {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    margin-left: 2px;
  }
  .owc-subject-hub .tutor-star {
    font-size: 12px;
    line-height: 1;
    color: var(--border-strong);
  }
  .owc-subject-hub .tutor-star.filled {
    color: var(--orange);
  }
  .owc-subject-hub .tutor-rate-text {
    font-size: 11px;
    color: var(--text-faint);
    margin-left: 4px;
    font-weight: 600;
    white-space: nowrap;
  }
  .owc-subject-hub .avail-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--status-green); display: inline-block;
  }
  .owc-subject-hub .avail-dot.limited { background: var(--status-amber); }
  .owc-subject-hub .avail-dot.offline { background: var(--status-grey); }
  .owc-subject-hub .tutor-avail-text { color: var(--text-muted); font-weight: 500; }
  .owc-subject-hub .tutor-new-badge {
    font-size: 10px; font-weight: 700;
    letter-spacing: .8px; text-transform: uppercase;
    padding: 3px 8px; border-radius: 4px;
    background: var(--bg-elev-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
  }

  /* ============ TRUST STRIP ============ */
  .owc-subject-hub .trust-strip {
    background: var(--bg-elev);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 24px 48px;
    margin-top: 36px;
  }
  .owc-subject-hub .trust-grid {
    max-width: 1360px; margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 22px;
  }
  .owc-subject-hub .trust-item {
    display: flex; align-items: center; gap: 12px;
  }
  .owc-subject-hub .trust-icon {
    width: 34px; height: 34px; border-radius: 6px;
    background: var(--bg-elev-2);
    display: grid; place-items: center;
    color: var(--navy); font-size: 16px;
    flex-shrink: 0;
    border: 1px solid var(--border);
  }
  html[data-theme="dark"] .owc-subject-hub .trust-icon { color: var(--orange); }
  .owc-subject-hub .trust-text .t-title {
    font-size: 13px; font-weight: 700;
    color: var(--text);
  }
  .owc-subject-hub .trust-text .t-sub {
    font-size: 12px; color: var(--text-muted);
    margin-top: 2px;
  }

  .footer {
    padding: 28px 48px;
    text-align: center;
    color: var(--text-faint);
    font-size: 12.5px;
    border-top: 1px solid var(--border);
  }

  @media (max-width: 900px) {
    .topnav { padding: 12px 16px; gap: 12px; }
    .topnav-links { display: none; }
    .owc-subject-hub .breadcrumb, .subject-switcher, .hero, .section, .trust-strip, .footer { padding-left: 20px; padding-right: 20px; }
    .owc-subject-hub .hero { padding-top: 24px; }
    .owc-subject-hub .hero-stats { gap: 20px; }
    .owc-subject-hub .stat .num { font-size: 22px; }
    .owc-subject-hub .channel-grid { grid-template-columns: 1fr; }
    .owc-subject-hub .tutor-grid { grid-template-columns: 1fr; }
  }
  @media (max-width: 600px) {
    .owc-subject-hub .btn-outline { display: none; }
  }