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

    /* ===== TOKENS ===== */
    :root {
      --bg: #f4f1ec;
      --surface: #ffffff;
      --surface2: #f9f7f4;
      --border: #e2ddd6;
      --text: #1a1714;
      --muted: #7a7168;
      --accent: #c9622f;
      --accent2: #3a6b5c;
      --gradient: linear-gradient(135deg, #c9622f 0%, #e8903e 100%);
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 32px rgba(0,0,0,0.10);
      --radius: 16px;
      --radius-sm: 10px;

      /* BMI band colors */
      --c-under: #5b8fd6;
      --c-normal: #3aaa78;
      --c-over: #f5a623;
      --c-obese: #e05252;
    }
    [data-theme="night"] {
      --bg: #111009;
      --surface: #1c1a16;
      --surface2: #231f1a;
      --border: #302b24;
      --text: #f0ece4;
      --muted: #9a9080;
      --accent: #e07840;
      --accent2: #5ab896;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
      --shadow-md: 0 8px 32px rgba(0,0,0,0.5);
    }

    /* ===== BASE ===== */
    html, body { min-height: 100%; }
    body {
      font-family: 'DM Sans', sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      transition: background 0.3s, color 0.3s;
    }

    /* ===== HEADER ===== */
    .header {
      position: sticky; top: 0; z-index: 999;
      background: rgba(244,241,236,0.85);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border);
    }
    [data-theme="night"] .header {
      background: rgba(17,16,9,0.85);
    }
    .header-inner {
      max-width: 1140px; margin: 0 auto;
      padding: 14px 24px;
      display: flex; align-items: center; justify-content: space-between;
    }
    .logo {
      font-family: 'DM Serif Display', serif;
      font-size: 1.6rem; color: var(--accent);
      text-decoration: none; letter-spacing: -0.5px;
    }
    .nav { display: flex; gap: 24px; }
    .nav a { text-decoration: none; color: var(--muted); font-weight: 500; font-size: 0.92rem; transition: color 0.2s; }
    .nav a:hover { color: var(--accent); }
    .theme-btn {
      border: 1.5px solid var(--border); background: var(--surface);
      color: var(--text); padding: 6px 14px; border-radius: 999px;
      cursor: pointer; font-size: 0.85rem; font-family: 'DM Sans', sans-serif;
      transition: all 0.2s;
    }
    .theme-btn:hover { border-color: var(--accent); color: var(--accent); }

    /* ===== CONTAINER ===== */
    .container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

    /* ===== HERO ===== */
    .hero {
      padding: 56px 0 40px;
      display: flex; align-items: flex-start; gap: 16px;
    }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 6px;
      background: var(--accent); color: #fff;
      font-size: 0.75rem; font-weight: 700; letter-spacing: 0.06em;
      padding: 4px 12px; border-radius: 999px; text-transform: uppercase;
      margin-bottom: 14px;
    }
    .hero h1 {
      font-family: 'DM Serif Display', serif;
      font-size: clamp(2rem, 5vw, 3rem);
      line-height: 1.15; color: var(--text); margin-bottom: 12px;
      font-weight: 400;
    }
    .hero h1 em { color: var(--accent); font-style: italic; }
    .hero-sub { color: var(--muted); font-size: 1.05rem; max-width: 580px; }

    /* ===== MAIN LAYOUT ===== */
    .page-grid {
      display: grid;
      grid-template-columns: 1fr 280px;
      gap: 32px;
      padding-bottom: 80px;
      align-items: start;
    }

    /* ===== TOOL CARD ===== */
    .tool-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      padding: 36px;
      margin-bottom: 28px;
    }
    .tool-card h2 {
      font-family: 'DM Serif Display', serif;
      font-size: 1.3rem; font-weight: 400;
      margin-bottom: 24px; color: var(--text);
    }

    /* ===== INPUTS ===== */
    .input-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 24px; }
    .field label {
      display: block; font-size: 0.8rem; font-weight: 700;
      letter-spacing: 0.08em; text-transform: uppercase;
      color: var(--muted); margin-bottom: 8px;
    }
    .input-wrap {
      position: relative;
    }
    .input-wrap input {
      width: 100%; padding: 14px 50px 14px 18px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-sm);
      background: var(--surface2);
      color: var(--text); font-size: 1.05rem;
      font-family: 'DM Sans', sans-serif;
      outline: none; transition: border-color 0.2s, box-shadow 0.2s;
    }
    .input-wrap input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(201,98,47,0.12);
    }
    .unit-tag {
      position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
      font-size: 0.8rem; font-weight: 700; color: var(--muted);
      pointer-events: none; letter-spacing: 0.05em;
    }

    /* ===== UNIT TOGGLE ===== */
    .unit-toggle {
      display: flex; gap: 0; margin-bottom: 24px;
      border: 1.5px solid var(--border); border-radius: var(--radius-sm);
      overflow: hidden; width: fit-content;
    }
    .unit-toggle button {
      padding: 8px 22px; border: none; background: transparent;
      color: var(--muted); font-family: 'DM Sans', sans-serif;
      font-size: 0.85rem; font-weight: 600; cursor: pointer;
      transition: all 0.2s;
    }
    .unit-toggle button.active {
      background: var(--accent); color: #fff;
    }

    /* ===== CALC BUTTON ===== */
    .calc-btn {
      width: 100%; padding: 16px;
      background: var(--gradient);
      color: #fff; border: none;
      border-radius: var(--radius-sm);
      font-family: 'DM Sans', sans-serif;
      font-size: 1rem; font-weight: 700;
      letter-spacing: 0.04em; cursor: pointer;
      transition: opacity 0.2s, transform 0.15s;
      box-shadow: 0 4px 16px rgba(201,98,47,0.3);
    }
    .calc-btn:hover { opacity: 0.92; transform: translateY(-1px); }
    .calc-btn:active { transform: translateY(0); }

    /* ===== RESULT PANEL ===== */
    .result-panel {
      margin-top: 28px; opacity: 0;
      transform: translateY(12px);
      transition: opacity 0.4s ease, transform 0.4s ease;
      pointer-events: none;
    }
    .result-panel.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

    /* Big BMI number */
    .bmi-hero {
      display: flex; align-items: baseline; gap: 10px;
      margin-bottom: 6px;
    }
    .bmi-number {
      font-family: 'DM Serif Display', serif;
      font-size: 4rem; line-height: 1;
      color: var(--result-color, var(--accent));
      transition: color 0.4s;
    }
    .bmi-unit { font-size: 1rem; color: var(--muted); }

    /* STATUS BADGE */
    .status-badge {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 8px 18px; border-radius: 999px;
      font-weight: 700; font-size: 0.92rem;
      background: var(--badge-bg, #e8f5ee);
      color: var(--badge-color, #2a7a52);
      margin-bottom: 18px;
      transition: all 0.3s;
    }
    .status-dot {
      width: 10px; height: 10px; border-radius: 50%;
      background: currentColor; flex-shrink: 0;
    }

    /* === VISUAL GAUGE === */
    .gauge-wrap { margin-bottom: 20px; }
    .gauge-label-row {
      display: flex; justify-content: space-between;
      font-size: 0.7rem; font-weight: 600;
      color: var(--muted); margin-bottom: 6px;
      text-transform: uppercase; letter-spacing: 0.06em;
    }
    .gauge-track {
      position: relative; height: 14px; border-radius: 999px; overflow: visible;
      display: flex;
    }
    .gauge-seg {
      flex: 1; height: 100%;
    }
    .gauge-seg:first-child { border-radius: 999px 0 0 999px; }
    .gauge-seg:last-child { border-radius: 0 999px 999px 0; }
    .gauge-track { border-radius: 999px; overflow: hidden; }
    .gauge-needle {
      position: absolute; top: -4px;
      width: 4px; height: 22px; border-radius: 2px;
      background: var(--text);
      transform: translateX(-50%);
      transition: left 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
      box-shadow: 0 2px 6px rgba(0,0,0,0.3);
      z-index: 2;
    }
    .gauge-cat-labels {
      display: grid; grid-template-columns: 1fr 1fr 1fr 1fr;
      margin-top: 6px;
    }
    .gauge-cat-labels span {
      font-size: 0.65rem; color: var(--muted); text-align: center;
      font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em;
    }

    /* Icon visual indicator */
    .visual-indicator {
      display: flex; align-items: center; gap: 16px;
      padding: 16px; border-radius: var(--radius-sm);
      background: var(--surface2); border: 1px solid var(--border);
      margin-bottom: 20px;
    }
    .vi-icon { font-size: 2.6rem; line-height: 1; }
    .vi-text h3 { font-size: 1rem; font-weight: 700; margin-bottom: 2px; }
    .vi-text p { font-size: 0.85rem; color: var(--muted); }

    /* Stats row */
    .stats-row {
      display: grid; grid-template-columns: 1fr 1fr;
      gap: 14px; margin-top: 18px;
    }
    .stat-box {
      background: var(--surface2);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      padding: 14px 16px;
    }
    .stat-box .stat-label {
      font-size: 0.7rem; text-transform: uppercase;
      letter-spacing: 0.08em; color: var(--muted);
      font-weight: 700; margin-bottom: 4px;
    }
    .stat-box .stat-val {
      font-family: 'DM Serif Display', serif;
      font-size: 1.4rem; color: var(--text);
    }

    /* Healthy range bar */
    .healthy-hint {
      font-size: 0.82rem; color: var(--muted);
      margin-top: 10px; padding-top: 14px;
      border-top: 1px solid var(--border);
    }
    .healthy-hint strong { color: var(--accent2); }

    /* Disclaimer */
    .disclaimer {
      display: flex; gap: 10px; align-items: flex-start;
      background: #fff8f0; border: 1px solid #fad7b5;
      border-radius: var(--radius-sm); padding: 14px 16px;
      margin-top: 20px; font-size: 0.82rem; color: #7a5030;
    }
    [data-theme="night"] .disclaimer {
      background: #2a1e10; border-color: #5a3a1a; color: #c49060;
    }
    .disclaimer-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }

    /* ===== BMI TABLE ===== */
    .bmi-table {
      width: 100%; border-collapse: separate; border-spacing: 0;
      font-size: 0.9rem;
    }
    .bmi-table th {
      background: var(--surface2); padding: 10px 14px;
      text-align: left; font-size: 0.75rem;
      text-transform: uppercase; letter-spacing: 0.07em;
      color: var(--muted); font-weight: 700;
      border-bottom: 1px solid var(--border);
    }
    .bmi-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); }
    .bmi-table tr:last-child td { border-bottom: none; }
    .bmi-table tr.highlight td { font-weight: 700; }
    .dot {
      display: inline-block; width: 10px; height: 10px;
      border-radius: 50%; margin-right: 6px; vertical-align: middle;
    }

    /* ===== SIDEBAR ===== */
    .sidebar-section {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      margin-bottom: 20px;
    }
    .sidebar-section h3 {
      font-family: 'DM Serif Display', serif;
      font-size: 1.1rem; font-weight: 400;
      margin-bottom: 16px; color: var(--text);
    }
    .quick-links { display: flex; flex-direction: column; gap: 10px; }
    .quick-links a {
      display: flex; align-items: center; gap: 10px;
      padding: 10px 14px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-sm);
      color: var(--text); text-decoration: none;
      font-size: 0.88rem; font-weight: 500;
      transition: all 0.2s;
    }
    .quick-links a:hover { border-color: var(--accent); color: var(--accent); background: var(--surface2); }
    .ql-icon { font-size: 1.1rem; }

    /* Tip cards */
    .tip-list { display: flex; flex-direction: column; gap: 10px; }
    .tip {
      display: flex; gap: 10px; align-items: flex-start;
      font-size: 0.84rem; color: var(--muted);
    }
    .tip-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }

    /* ===== SEO CONTENT ===== */
    .content-block {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px;
      margin-bottom: 24px;
    }
    .content-block h2 {
      font-family: 'DM Serif Display', serif;
      font-size: 1.5rem; font-weight: 400;
      margin-bottom: 12px; margin-top: 28px; color: var(--text);
    }
    .content-block h2:first-child { margin-top: 0; }
    .content-block h3 {
      font-size: 1rem; font-weight: 700; margin: 20px 0 8px;
      color: var(--text);
    }
    .content-block p { color: var(--muted); margin-bottom: 12px; font-size: 0.95rem; }
    .content-block ul, .content-block ol {
      color: var(--muted); padding-left: 20px; margin-bottom: 12px; font-size: 0.95rem;
    }
    .content-block li { margin-bottom: 6px; }

    /* FAQ */
    .faq-item {
      border-top: 1px solid var(--border); padding: 16px 0;
    }
    .faq-item:last-child { border-bottom: 1px solid var(--border); }
    .faq-q { font-weight: 700; font-size: 0.95rem; margin-bottom: 6px; cursor: pointer; display: flex; justify-content: space-between; }
    .faq-a { color: var(--muted); font-size: 0.88rem; display: none; }
    .faq-a.open { display: block; }
    .faq-arrow { transition: transform 0.2s; }
    .faq-q.open .faq-arrow { transform: rotate(180deg); }

    /* ===== FOOTER ===== */
    .footer {
      background: var(--surface); border-top: 1px solid var(--border);
      padding: 32px 24px; margin-top: 0;
    }
    .footer-inner {
      max-width: 1140px; margin: 0 auto;
      display: flex; align-items: center; justify-content: space-between;
      flex-wrap: wrap; gap: 12px;
    }
    .footer p { color: var(--muted); font-size: 0.85rem; }
    .footer-links { display: flex; gap: 16px; }
    .footer-links a { color: var(--muted); font-size: 0.85rem; text-decoration: none; }
    .footer-links a:hover { color: var(--accent); }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 900px) {
      .page-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 600px) {
      .input-row { grid-template-columns: 1fr; }
      .tool-card { padding: 22px; }
      .header-inner { flex-wrap: wrap; gap: 10px; }
      .hero h1 { font-size: 2rem; }
    }