/* ============================================================
   Owl Standard — 簡樸房認證專家 · 一站式業主管理服務
   Built on Owl Square family colors_and_type.css
   Tone: senior consultant, B2B, editorial, sober
   ============================================================ */

/* ============================================================
   Owl Square Design System — Colors + Type (inlined from colors_and_type.css)
   ============================================================ */

/* Google Fonts loaded non-blocking via <link rel="preload"> in build.js */

:root {
  /* ---------- BRAND COLORS ---------- */
  --owl-brown-900: #3a2418;
  --owl-brown-800: #5a3d2c;
  --owl-brown-700: #7a5a3f;
  --owl-brown-600: #8b6a4a;
  --owl-brown-500: #a08368;
  --owl-brown-400: #b89a7e;
  --owl-brown-300: #d4bfa6;
  --owl-brown-200: #e8dccb;
  --owl-brown-100: #f5efe6;

  --owl-orange-700: #d65a1a;
  --owl-orange-600: #ea6321;
  --owl-orange-500: #f37a2c;
  --owl-orange-400: #f89556;
  --owl-orange-300: #fbb582;
  --owl-orange-200: #fdd5b8;
  --owl-orange-100: #fef0e2;

  --owl-yellow-600: #e9a712;
  --owl-yellow-500: #f5b827;
  --owl-yellow-400: #ffc94a;
  --owl-yellow-100: #fff3d1;

  --owl-black:      #0e0e0e;
  --owl-ink-900:    #1c1c1c;
  --owl-ink-800:    #2e2e2e;
  --owl-ink-700:    #4a4a4a;
  --owl-ink-600:    #6b6b6b;
  --owl-ink-500:    #8a8a8a;
  --owl-ink-400:    #b2b2b2;
  --owl-ink-300:    #d4d4d4;
  --owl-ink-200:    #e7e7e7;
  --owl-ink-100:    #f4f4f4;
  --owl-white:      #ffffff;

  --status-available: var(--owl-orange-600);
  --status-new:       var(--owl-ink-600);
  --status-occupied:  var(--owl-black);
  --status-soon:      var(--owl-brown-400);

  /* ---------- SEMANTIC TOKENS ---------- */
  --bg-page:        var(--owl-white);
  --bg-warm:        var(--owl-brown-100);
  --bg-panel:       var(--owl-white);
  --bg-inverse:     var(--owl-black);
  --bg-subtle:      var(--owl-ink-100);

  --fg-primary:     var(--owl-ink-900);
  --fg-secondary:   var(--owl-ink-700);
  --fg-muted:       var(--owl-ink-600);
  --fg-on-inverse:  var(--owl-white);
  --fg-on-warm:     var(--owl-brown-900);
  --fg-brand:       var(--owl-orange-600);
  --fg-link:        var(--owl-orange-600);
  --fg-link-hover:  var(--owl-orange-700);

  --border-soft:    #ebe4d8;
  --border-default: var(--owl-ink-200);
  --border-strong:  var(--owl-ink-400);

  /* ---------- TYPE FAMILIES ---------- */
  --font-display: 'Quicksand', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body:    'Quicksand', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-cjk:     'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --font-serif:   'Noto Serif TC', Georgia, serif;
  --font-mono:    ui-monospace, 'SF Mono', Menlo, monospace;

  /* ---------- TYPE SCALE (1.25 major-third) ---------- */
  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-18: 1.125rem;
  --fs-20: 1.25rem;
  --fs-24: 1.5rem;
  --fs-30: 1.875rem;
  --fs-36: 2.25rem;
  --fs-44: 2.75rem;
  --fs-56: 3.5rem;
  --fs-72: 4.5rem;

  /* ---------- WEIGHTS ---------- */
  --fw-regular: 400;
  --fw-medium:  500;
  --fw-semibold: 600;
  --fw-bold:    700;

  /* ---------- LINE HEIGHTS ---------- */
  --lh-tight: 1.1;
  --lh-snug:  1.25;
  --lh-base:  1.5;
  --lh-loose: 1.75;

  /* ---------- LETTER SPACING ---------- */
  --tracking-tight: -0.01em;
  --tracking-base:   0;
  --tracking-wide:   0.04em;
  --tracking-caps:   0.16em;

  /* ---------- SPACING (4-pt grid) ---------- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 64px;
  --sp-9: 96px;
  --sp-10: 128px;

  /* ---------- RADII ---------- */
  --r-xs: 2px;
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 20px;
  --r-pill: 999px;

  /* ---------- SHADOWS ---------- */
  --sh-1: 0 1px 2px rgba(28, 20, 12, 0.06);
  --sh-2: 0 4px 12px rgba(28, 20, 12, 0.08);
  --sh-3: 0 12px 32px rgba(28, 20, 12, 0.12);
  --sh-card: 0 8px 24px rgba(58, 36, 24, 0.10);

  /* ---------- MOTION ---------- */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:      cubic-bezier(0, 0, 0.2, 1);
  --ease-in:       cubic-bezier(0.4, 0, 1, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
  --dur-slow: 360ms;
}

/* ============================================================
   SEMANTIC TYPOGRAPHY (apply via class or descendants)
   ============================================================ */

html, body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: var(--lh-base);
  color: var(--fg-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.os-display, h1, .h1 {
  font-family: var(--font-display);
  font-size: clamp(var(--fs-36), 4vw + 1rem, var(--fs-72));
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--fg-primary);
  text-wrap: balance;
}

h2, .h2 {
  font-family: var(--font-display);
  font-size: clamp(var(--fs-30), 2.5vw + 0.6rem, var(--fs-56));
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--fg-primary);
}

h3, .h3 {
  font-family: var(--font-display);
  font-size: var(--fs-30);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--fg-primary);
}

h4, .h4 {
  font-family: var(--font-display);
  font-size: var(--fs-24);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--fg-primary);
}

h5, .h5 {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--fg-primary);
}

h6, .h6 {
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--fg-primary);
}

p, .body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: var(--lh-base);
  color: var(--fg-secondary);
  text-wrap: pretty;
}

.lede {
  font-size: var(--fs-20);
  line-height: var(--lh-base);
  color: var(--fg-secondary);
  font-weight: var(--fw-medium);
}

.caption {
  font-size: var(--fs-14);
  line-height: var(--lh-snug);
  color: var(--fg-muted);
}

.eyebrow,
.section-label {
  font-family: var(--font-display);
  font-size: var(--fs-14);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--fg-secondary);
}

.price {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  color: var(--fg-brand);
}

.code, code, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.os-wordmark {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
}
.os-wordmark .owl  { color: var(--owl-brown-700); }
.os-wordmark .square { color: var(--owl-orange-600); }
.os-wordmark .tagline {
  display: block;
  font-size: 0.42em;
  font-weight: var(--fw-medium);
  color: var(--owl-ink-600);
  letter-spacing: var(--tracking-wide);
  margin-top: 0.1em;
}

:focus-visible {
  outline: 2px solid var(--owl-orange-600);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

:root {
  --os-ink:        #14201c;
  --os-ink-2:      #1f2d28;
  --os-ink-3:      #2c3a35;
  --os-paper:      #fbf8f2;
  --os-paper-2:    #f3eee2;
  --os-line:       #d8cfbe;
  --os-line-soft:  #ece5d4;
  --os-rule:       #2a3833;
  --os-accent:     #ea6321;
  --os-accent-d:   #c04d12;
  --os-clay:       #7a5a3f;
  --os-muted:      #5b6864;
  --os-muted-2:    #8a948f;
  --os-warn:       #b54a1a;

  --os-serif:      'Noto Serif TC', 'Source Han Serif', Georgia, serif;
  --os-sans:       'Quicksand', 'Noto Sans TC', -apple-system, sans-serif;
  --os-cjk:        'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;

  --os-radius:     4px;
  --os-radius-lg:  10px;
  --os-shadow:     0 1px 0 rgba(20,32,28,.04), 0 8px 24px rgba(20,32,28,.06);
  --os-shadow-lg:  0 30px 60px -20px rgba(20,32,28,.18);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--os-cjk);
  font-size: 17px;
  line-height: 1.75;
  color: var(--os-ink);
  background: var(--os-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* Type */
.os-eyebrow { font-family: var(--os-sans); font-size: 12px; font-weight: 600; letter-spacing: 0.22em; text-transform: uppercase; color: var(--os-accent); }
.os-eyebrow-mute { color: var(--os-muted); }
.os-display { font-family: var(--os-serif); font-weight: 600; letter-spacing: -0.005em; line-height: 1.25; color: var(--os-ink); text-wrap: balance; }
.os-h1 { font-size: clamp(36px, 5vw, 64px); }
.os-h2 { font-size: clamp(28px, 3.4vw, 44px); }
.os-h3 { font-size: clamp(20px, 2vw, 26px); }
.os-lede { font-size: clamp(17px, 1.3vw, 19px); line-height: 1.8; color: var(--os-muted); text-wrap: pretty; max-width: 60ch; }
.os-mute { color: var(--os-muted); }
.os-rule { height: 1px; background: var(--os-line); margin: 0; border: 0; }

/* Layout */
.os-shell { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
.os-shell-narrow { max-width: 980px; margin: 0 auto; padding: 0 32px; }
@media (max-width: 720px) { .os-shell, .os-shell-narrow { padding: 0 20px; } }

/* Header */
.os-header { position: sticky; top: 0; z-index: 50; background: rgba(251,248,242,.92); backdrop-filter: saturate(140%) blur(8px); border-bottom: 1px solid var(--os-line-soft); }
.os-header-row { display: flex; align-items: center; gap: 36px; height: 80px; }
.os-brand { display: flex; flex-direction: column; line-height: 1.1; }
.os-brand-mark { font-family: var(--os-serif); font-weight: 700; font-size: 22px; letter-spacing: -0.01em; color: var(--os-ink); }
.os-brand-mark .o-orange { color: var(--os-accent); }
.os-brand-tag { font-family: var(--os-cjk); font-size: 11px; font-weight: 400; color: var(--os-muted); margin-top: 4px; letter-spacing: 0.05em; }
.os-nav { display: flex; gap: 28px; margin-left: auto; }
.os-nav a { font-family: var(--os-cjk); font-size: 16px; color: var(--os-ink); position: relative; padding: 6px 0; transition: color .2s; }
.os-nav a:hover, .os-nav a.is-active { color: var(--os-accent); }
.os-nav a.is-active::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--os-accent); }
.os-cta-wa { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; background: #25D366; color: #fff; border-radius: 999px; font-family: var(--os-cjk); font-size: 14px; font-weight: 500; border: 0; cursor: pointer; transition: background .2s; }
.os-cta-wa:hover { background: #1ebe5d; }
.os-cta-wa svg { width: 16px; height: 16px; }
.os-burger { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--os-line); background: transparent; border-radius: var(--os-radius); cursor: pointer; align-items: center; justify-content: center; }
.os-burger span { width: 18px; height: 1.5px; background: var(--os-ink); position: relative; }
.os-burger span::before, .os-burger span::after { content: ""; position: absolute; left: 0; right: 0; height: 1.5px; background: var(--os-ink); }
.os-burger span::before { top: -6px; } .os-burger span::after { top: 6px; }
@media (max-width: 980px) { .os-nav, .os-header .os-cta-wa { display: none; } .os-burger { display: inline-flex; } }

/* Language switcher */
.os-lang-switch { display: flex; gap: 4px; margin-left: 8px; }
.os-lang-btn { font-family: var(--os-sans); font-size: 11px; font-weight: 700; letter-spacing: 0.08em; color: var(--os-muted); padding: 4px 9px; border-radius: var(--os-radius); border: 1px solid transparent; transition: color .2s, border-color .2s; }
.os-lang-btn:hover { color: var(--os-ink); border-color: var(--os-line); }
.os-lang-btn.is-active { color: var(--os-accent); border-color: var(--os-accent); background: rgba(234,99,33,.06); }
@media (max-width: 720px) { .os-lang-switch { display: none; } }
.os-mobile-menu { position: fixed; inset: 80px 0 0 0; background: var(--os-paper); z-index: 200; display: none; flex-direction: column; padding: 32px 24px; border-top: 1px solid var(--os-line-soft); overflow-y: auto; }
.os-mobile-menu.is-open { display: flex; }
.os-mobile-menu a { font-family: var(--os-serif); font-size: 22px; padding: 14px 0; border-bottom: 1px solid var(--os-line-soft); }

/* Floating WhatsApp */
.os-fab { position: fixed; right: 28px; bottom: 28px; z-index: 60; display: inline-flex; align-items: center; gap: 10px; background: #25D366; color: #fff; padding: 16px 22px; border-radius: 999px; font-family: var(--os-cjk); font-weight: 600; font-size: 15px; border: 0; cursor: pointer; box-shadow: 0 12px 28px rgba(37,211,102,.32); transition: transform .2s, background .2s; }
.os-fab:hover { background: #1ebe5d; transform: translateY(-2px); }
.os-fab svg { width: 22px; height: 22px; }
@media (max-width: 720px) { .os-fab { right: 16px; bottom: 16px; padding: 14px 18px; font-size: 14px; } }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 28px; font-family: var(--os-cjk); font-size: 16px; font-weight: 500; border-radius: 999px; border: 0; cursor: pointer; transition: all .2s ease; }
.btn-primary { background: var(--os-accent); color: #fff; }
.btn-primary:hover { background: var(--os-accent-d); transform: translateY(-2px); }
.btn-dark { background: var(--os-ink); color: #fff; }
.btn-dark:hover { background: var(--os-ink-3); }
.btn-ghost { background: transparent; color: var(--os-ink); border: 1px solid var(--os-ink); }
.btn-ghost:hover { background: var(--os-ink); color: #fff; }
.btn-link { background: transparent; color: var(--os-ink); padding: 8px 0; border-radius: 0; font-weight: 600; border-bottom: 1px solid var(--os-ink); }
.btn-link:hover { color: var(--os-accent); border-color: var(--os-accent); }
.btn-arrow::after { content: " →"; transition: transform .2s; display: inline-block; }
.btn-arrow:hover::after { transform: translateX(3px); }

/* Sections */
.os-section { padding: clamp(64px, 9vw, 120px) 0; }
.os-section-tight { padding: clamp(48px, 6vw, 80px) 0; }
.os-section-dark { background: var(--os-ink); color: #fff; }
.os-section-dark .os-display { color: #fff; }
.os-section-dark .os-lede { color: rgba(255,255,255,.7); }
.os-section-warm { background: var(--os-paper-2); }

/* Triangle pip (family motif) */
.os-pip { display: inline-block; width: 0; height: 0; border-style: solid; border-width: 6px 0 6px 9px; border-color: transparent transparent transparent var(--os-accent); vertical-align: middle; }

/* Card */
.os-card { background: #fff; border: 1px solid var(--os-line-soft); border-radius: var(--os-radius-lg); padding: 32px; transition: transform .25s, box-shadow .25s, border-color .25s; }
.os-card:hover { transform: translateY(-3px); box-shadow: var(--os-shadow); border-color: var(--os-line); }

/* Breadcrumb */
.os-breadcrumb { font-family: var(--os-cjk); font-size: 13px; color: var(--os-muted); display: flex; gap: 8px; align-items: center; padding: 24px 0; }
.os-breadcrumb a:hover { color: var(--os-accent); }
.os-breadcrumb .sep { color: var(--os-muted-2); }

/* Tag */
.os-tag { display: inline-flex; align-items: center; gap: 8px; font-family: var(--os-sans); font-size: 11px; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; padding: 6px 12px; border: 1px solid var(--os-line); border-radius: 999px; color: var(--os-muted); }
.os-tag-accent { background: var(--os-accent); color: #fff; border-color: var(--os-accent); }

/* Number */
.os-num { font-family: var(--os-serif); font-weight: 500; font-style: italic; font-size: 56px; line-height: 1; color: var(--os-accent); letter-spacing: -0.02em; }

/* Footer */
.os-footer { background: var(--os-ink); color: #d6d2c8; padding: 80px 0 36px; margin-top: 96px; }
.os-footer h6 { font-family: var(--os-sans); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255,255,255,.55); font-weight: 600; margin: 0 0 18px; }
.os-footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: 48px; }
.os-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.os-footer ul a { font-size: 14px; color: #d6d2c8; transition: color .2s; }
.os-footer ul a:hover { color: var(--os-accent); }
.os-family { border-top: 1px solid rgba(255,255,255,.12); border-bottom: 1px solid rgba(255,255,255,.12); padding: 28px 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 56px 0 28px; }
.os-family a { display: flex; flex-direction: column; gap: 4px; padding: 8px 0; font-family: var(--os-serif); color: rgba(255,255,255,.7); transition: color .2s; }
.os-family a:hover { color: #fff; }
.os-family a.is-current { color: var(--os-accent); }
.os-family a small { font-family: var(--os-sans); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: rgba(255,255,255,.45); }
.os-meta { display: flex; justify-content: space-between; font-size: 13px; color: rgba(255,255,255,.45); flex-wrap: wrap; gap: 16px; }
@media (max-width: 980px) { .os-footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; } .os-family { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .os-footer-grid { grid-template-columns: 1fr; } .os-family { grid-template-columns: 1fr; } }

/* CTA Band */
.os-cta-band { background: var(--os-ink); color: #fff; padding: clamp(64px, 8vw, 112px) 0; text-align: center; position: relative; overflow: hidden; }
.os-cta-band::before { content: ""; position: absolute; inset: 0; background: radial-gradient(ellipse at top right, rgba(234,99,33,.18), transparent 55%); pointer-events: none; }
.os-cta-band > * { position: relative; }
.os-cta-band .os-display { color: #fff; }
.os-cta-count { display: inline-flex; align-items: baseline; gap: 8px; font-family: var(--os-serif); font-weight: 500; font-size: clamp(40px, 5vw, 64px); color: var(--os-accent); }
.os-cta-count small { font-family: var(--os-cjk); font-size: 16px; color: rgba(255,255,255,.7); font-weight: 400; }

/* Forms */
.os-input, .os-textarea, .os-select { width: 100%; padding: 14px 16px; font-family: var(--os-cjk); font-size: 16px; background: #fff; border: 1px solid var(--os-line); border-radius: var(--os-radius); color: var(--os-ink); transition: border-color .2s; }
.os-input:focus { outline: 0; border-color: var(--os-ink); box-shadow: 0 0 0 3px rgba(20,32,28,.06); }
.os-label { display: block; font-family: var(--os-cjk); font-size: 13px; font-weight: 600; color: var(--os-ink); margin-bottom: 8px; }
.os-label .req { color: var(--os-accent); }

/* Quiz */
.os-quiz { background: #fff; border: 1px solid var(--os-line-soft); border-radius: var(--os-radius-lg); padding: 40px; box-shadow: var(--os-shadow); }
.os-quiz-progress { height: 3px; background: var(--os-line-soft); border-radius: 999px; overflow: hidden; margin-bottom: 24px; }
.os-quiz-progress > div { height: 100%; background: var(--os-accent); transition: width .4s ease; }
.os-quiz-step { font-family: var(--os-sans); font-size: 12px; letter-spacing: 0.2em; color: var(--os-muted); margin-bottom: 14px; text-transform: uppercase; }
.os-quiz-q { font-family: var(--os-serif); font-weight: 600; font-size: clamp(22px, 2vw, 28px); margin: 0 0 12px; line-height: 1.35; }
.os-quiz-help { color: var(--os-muted); font-size: 14px; margin-bottom: 24px; }
.os-quiz-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 28px; }
.os-quiz-opt { display: flex; align-items: center; gap: 14px; padding: 18px 22px; border: 1px solid var(--os-line); border-radius: var(--os-radius); background: #fff; font-family: var(--os-cjk); font-size: 16px; cursor: pointer; text-align: left; transition: all .15s; min-height: 56px; }
.os-quiz-opt:hover { border-color: var(--os-ink); background: #faf6ec; }
.os-quiz-opt.is-selected { border-color: var(--os-ink); background: var(--os-ink); color: #fff; }
.os-quiz-opt .key { width: 28px; height: 28px; border-radius: 50%; background: var(--os-paper-2); color: var(--os-ink); display: inline-flex; align-items: center; justify-content: center; font-family: var(--os-sans); font-weight: 600; font-size: 13px; flex-shrink: 0; }
.os-quiz-opt.is-selected .key { background: var(--os-accent); color: #fff; }
.os-quiz-nav { display: flex; justify-content: space-between; align-items: center; }
.os-quiz-nav button[disabled] { opacity: 0.35; cursor: not-allowed; }

/* Grids */
.os-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.os-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.os-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 880px) { .os-grid-3, .os-grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .os-grid-2, .os-grid-3, .os-grid-4 { grid-template-columns: 1fr; } }

/* FAQ details */
.os-faq { padding: 22px 0; border-bottom: 1px solid var(--os-line); }
.os-faq summary { list-style: none; cursor: pointer; font-family: var(--os-serif); font-weight: 600; font-size: 19px; position: relative; padding-right: 32px; color: var(--os-ink); }
.os-faq summary::-webkit-details-marker { display: none; }
.os-faq summary::after { content: "+"; position: absolute; right: 0; top: -2px; font-family: var(--os-sans); font-weight: 400; font-size: 24px; color: var(--os-accent); }
.os-faq[open] summary::after { content: "−"; }
.os-faq:hover summary { color: var(--os-accent); }
.os-faq p { color: var(--os-muted); font-size: 15px; line-height: 1.8; margin: 14px 0 0; max-width: 70ch; }

/* Timeline horizontal */
.os-timeline-h { position: relative; padding: 60px 0 32px; }
.os-timeline-h .track { position: absolute; left: 0; right: 0; top: 96px; height: 2px; background: var(--os-line); }
.os-timeline-h .track .fill { height: 100%; background: var(--os-accent); width: 25%; }
.os-tl-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; position: relative; }
.os-tl-node { text-align: center; position: relative; padding-top: 56px; }
.os-tl-node::before { content: ""; position: absolute; top: 30px; left: 50%; transform: translateX(-50%); width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 2px solid var(--os-line); z-index: 1; }
.os-tl-node.is-passed::before { background: var(--os-accent); border-color: var(--os-accent); }
.os-tl-node.is-now::before { background: var(--os-accent); border-color: var(--os-accent); box-shadow: 0 0 0 6px rgba(234,99,33,.18); }
.os-tl-node .date { font-family: var(--os-serif); font-weight: 600; font-size: 18px; color: var(--os-ink); margin-bottom: 4px; }
.os-tl-node .label { font-family: var(--os-cjk); font-size: 13px; color: var(--os-muted); line-height: 1.5; padding: 0 8px; }
.os-tl-node.is-now .date { color: var(--os-accent); }
@media (max-width: 880px) { .os-tl-grid { grid-template-columns: 1fr; gap: 32px; } .os-timeline-h .track { left: 24px; top: 0; bottom: 0; right: auto; width: 2px; height: auto; } .os-timeline-h .track .fill { width: 100%; height: 25%; } .os-tl-node { text-align: left; padding: 0 0 0 60px; } .os-tl-node::before { top: 4px; left: 16px; transform: none; } }

/* ═══════════════════════════════════════════════════════════
   MOBILE RESPONSIVE LAYOUT
   Classes are added to inline-styled grid elements; !important
   overrides inline styles at each breakpoint.
   ═══════════════════════════════════════════════════════════ */

/* Hero two-column (desktop: 1.05fr 1fr) */
@media (max-width: 860px) {
  .os-hero-grid { grid-template-columns: 1fr !important; gap: 40px !important; }
  .os-hero-dossier { display: none !important; }
}

/* Countdown band (desktop: 1fr 1fr dark card) */
@media (max-width: 720px) {
  .os-count-band { grid-template-columns: 1fr !important; gap: 32px !important; padding: 36px 24px !important; }
  .os-count-band-right { border-left: 0 !important; padding-left: 0 !important; border-top: 1px solid rgba(255,255,255,.12); padding-top: 28px !important; }
}

/* Generic 2-col split (process header, etc.) */
@media (max-width: 720px) {
  .os-split-grid { grid-template-columns: 1fr !important; gap: 24px !important; }
}

/* Case study card (desktop: 1.1fr 1fr) */
@media (max-width: 720px) {
  .os-case-card-grid { grid-template-columns: 1fr !important; }
  .os-case-card-grid > *:first-child { min-height: 300px !important; border-right: 0 !important; border-bottom: 1px solid var(--os-line); }
}

/* Service list rows (desktop: 80px 1fr 200px) */
@media (max-width: 720px) {
  .os-service-row { grid-template-columns: 44px 1fr !important; gap: 16px !important; padding: 28px 0 !important; }
  .os-service-row > *:last-child { display: none !important; }
}

/* Service page content + CTA sidebar (desktop: 1fr 380px) */
@media (max-width: 860px) {
  .os-service-sidecard { grid-template-columns: 1fr !important; gap: 40px !important; }
}

/* Process step icon + content (desktop: 80px 1fr) — keep on mobile, just reduce gap */
@media (max-width: 480px) {
  .os-process-step { grid-template-columns: 44px 1fr !important; gap: 16px !important; padding-bottom: 36px !important; }
}

/* Process 2-col checklist → single column */
@media (max-width: 600px) {
  .os-process-list { grid-template-columns: 1fr !important; gap: 6px !important; }
}

/* Service FAQ comparison rows (desktop: 200px 1fr) */
@media (max-width: 600px) {
  .os-svc-compare-row { grid-template-columns: 1fr !important; gap: 4px !important; }
  .os-svc-compare-row > *:first-child { font-weight: 600; color: var(--os-muted); font-size: 13px; }
}

/* Contact page main grid */
@media (max-width: 720px) {
  .os-contact-grid { grid-template-columns: 1fr !important; gap: 40px !important; }
}

/* Contact info rows (desktop: 140px 1fr) */
@media (max-width: 600px) {
  .os-contact-info-row { grid-template-columns: 1fr !important; gap: 4px !important; }
}

/* About page main grid */
@media (max-width: 720px) {
  .os-about-grid { grid-template-columns: 1fr !important; gap: 40px !important; }
}

/* About 4-col stats → 2×2 */
@media (max-width: 600px) {
  .os-stats-4col { grid-template-columns: repeat(2, 1fr) !important; }
}

/* Latest articles card: fix border direction + padding on mobile */
@media (max-width: 600px) {
  .os-latest-articles-card { padding: 28px 20px !important; }
  .os-latest-article { border-right: 0 !important; border-bottom: 1px solid var(--os-line-soft); padding: 24px 0 !important; }
  .os-latest-article:last-child { border-bottom: 0; padding-bottom: 0 !important; }
}

/* Knowledge timeline page: countdown band (desktop: 1fr 1fr) */
@media (max-width: 720px) {
  .os-tl-count-band { grid-template-columns: 1fr !important; gap: 28px !important; padding: 32px 24px !important; }
}

/* Knowledge timeline page: timeline rows (desktop: 160px 100px 1fr 220px) */
@media (max-width: 880px) {
  .os-tl-row { grid-template-columns: auto auto !important; gap: 8px 16px !important; padding: 24px 0 !important; }
  .os-tl-row > *:nth-child(3) { grid-column: 1 / -1; margin-top: 8px; }
  .os-tl-row > *:nth-child(4) { grid-column: 1 / -1; }
}

/* Knowledge standards page: numbered rows (desktop: 80px 1fr) */
@media (max-width: 480px) {
  .os-std-row { grid-template-columns: 56px 1fr !important; gap: 16px !important; padding: 24px 0 !important; }
  .os-std-row .os-num { font-size: 32px !important; }
}

/* Case study photo gallery */
.os-photo-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.os-photo-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.os-photo-item { margin: 0; padding: 0; overflow: hidden; border-radius: var(--os-radius); }
.os-photo-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; transition: transform .3s ease; }
.os-photo-item:hover img { transform: scale(1.03); }
.os-photo-item figcaption { font-size: 11px; color: var(--os-muted-2); margin-top: 6px; font-family: var(--os-sans); letter-spacing: .08em; text-transform: uppercase; }

/* ── General mobile polish ─────────────────────── */
@media (max-width: 720px) {
  /* Full-width CTA buttons */
  .os-cta-band .btn { width: 100%; max-width: 340px; justify-content: center; }

  /* Card in case study: no hover lift on touch */
  .os-case-card-grid .os-card:hover { transform: none; }

  /* Reduce FAB label on very small screens */
  .os-fab { padding: 14px 18px; font-size: 14px; }

  /* Article grid sidebar stacks below */
  .os-article-grid { grid-template-columns: 1fr !important; }
  .os-article-sidebar { position: static !important; top: auto !important; }

  /* Article list rows: stack to single column, hide date column */
  .os-article-list-row { grid-template-columns: 1fr !important; gap: 12px !important; }
  .os-article-list-row > div:first-child { display: none !important; }

  /* Photo gallery: 2 columns on tablet/mobile */
  .os-photo-grid-3 { grid-template-columns: repeat(2, 1fr) !important; }
  .os-photo-grid-2 { grid-template-columns: repeat(2, 1fr) !important; }
}

@media (max-width: 480px) {
  /* Photo gallery: single column on small phones */
  .os-photo-grid-3, .os-photo-grid-2 { grid-template-columns: 1fr !important; }
}