/* KKLANG KKLang marketing site -- landing + essays + 404.
   Hand-written, no framework. CSS custom properties for theming.
   Brand palette: pink #E24EC0, teal #14b8a6, navy #0f172a (light theme). */

:root {
  --brand-pink: #E24EC0;
  --brand-pink-dark: #c72da0;
  --brand-pink-light: #f9a8d4;
  --brand-teal: #14b8a6;
  --brand-teal-dark: #0f766e;
  --brand-navy: #0f172a;
  --ink: #0f172a;
  --ink-soft: #334155;
  --body: #475569;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --soft-bg: #f8fafc;
  --soft-bg-2: #f1f5f9;
  --card-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
  --card-shadow-hover: 0 12px 28px rgba(15, 23, 42, 0.10);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  --max-width: 1140px;
  --max-width-narrow: 760px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--body);
  background: var(--soft-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand-pink-dark); text-decoration: none; transition: color .2s; }
a:hover { color: var(--brand-pink); }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; letter-spacing: -0.01em; margin: 0 0 0.5em; }
h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 700; }
h3 { font-size: clamp(1.1rem, 1.6vw, 1.3rem); font-weight: 700; }
p { margin: 0 0 1em; }

.sr-only { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--brand-navy); color: #fff; padding: 10px 16px;
  border-radius: 0 0 8px 0; font-weight: 700;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 3px solid var(--brand-pink); outline-offset: 2px; border-radius: 4px; }
button:focus-visible, a:focus-visible { outline-offset: 3px; }

/* ===== Layout primitives ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: var(--max-width-narrow); margin: 0 auto; padding: 0 20px; }
section { padding: 64px 0; }
section.tight { padding: 40px 0; }

.eyebrow {
  display: inline-block;
  font-size: 0.75rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--brand-pink-dark); margin-bottom: 12px;
}
.eyebrow.teal { color: var(--brand-teal-dark); }
.eyebrow.orange { color: #c2410c; }

.section-lead { color: var(--muted); font-size: 1.05rem; max-width: 60ch; margin: 0 auto 40px; text-align: center; }

/* ===== Topbar ===== */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top);
}
.topbar-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand-link { display: inline-flex; align-items: center; gap: 8px; color: var(--brand-pink-dark); font-weight: 800; font-size: 1.1rem; }
.brand-mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand-pink), var(--brand-teal));
  color: #fff; font-weight: 900; font-size: 0.85rem;
}
.topbar-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.topbar-nav a {
  color: var(--ink-soft); padding: 8px 12px; border-radius: 8px;
  font-size: 0.92rem; font-weight: 600;
}
.topbar-nav a.btn { color: #fff; }
.topbar-nav a.btn-outline { color: var(--ink-soft); }
.topbar-nav a.btn-outline:hover { color: var(--brand-pink-dark); }
.topbar-nav a:hover { color: var(--brand-pink-dark); background: var(--soft-bg-2); }
.topbar-nav .lang-select {
  border: 1px solid var(--line-strong); padding: 5px 6px;
  font-size: 0.8rem; font-weight: 600; font-family: inherit;
  color: var(--ink-soft); background: transparent; border-radius: 6px;
  cursor: pointer;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: var(--radius-sm); border: 0;
  font-size: 0.95rem; font-weight: 700; cursor: pointer;
  transition: transform .15s, box-shadow .15s, background .2s;
  font-family: inherit; text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--brand-pink); color: #fff; }
.btn-primary:hover { background: var(--brand-pink-dark); color: #fff; box-shadow: 0 6px 18px rgba(226,78,192,0.30); }
.btn-dark { background: var(--brand-navy); color: #fff; }
.btn-dark:hover { background: #1e293b; color: #fff; }
.btn-teal { background: var(--brand-teal); color: #fff; }
.btn-teal:hover { background: var(--brand-teal-dark); color: #fff; }
.btn-outline { background: transparent; border: 1.5px solid var(--line-strong); color: var(--ink-soft); }
.btn-outline:hover { border-color: var(--brand-pink); color: var(--brand-pink-dark); background: var(--soft-bg); }
.btn-sm { padding: 7px 12px; font-size: 0.85rem; }
.btn-lg { padding: 14px 26px; font-size: 1.05rem; }

/* ===== Hero ===== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  color: #fff;
  padding: 80px 0 64px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: url('/images/KKLANG-AI.jpg') center/cover no-repeat;
  opacity: 0.15;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(15,23,42,0.4) 100%);
}
.hero-inner { position: relative; z-index: 1; }
.hero-grid {
  max-width: var(--max-width); margin: 0 auto; padding: 0 20px;
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(226,78,192,0.15); border: 1px solid rgba(226,78,192,0.4);
  color: var(--brand-pink-light); padding: 6px 14px; border-radius: 999px;
  font-size: 0.82rem; font-weight: 700; margin-bottom: 20px;
}
.hero h1 { color: #fff; margin-bottom: 16px; }
.hero h1 .accent { color: var(--brand-pink); }
.hero-lead { color: #cbd5e1; font-size: 1.1rem; max-width: 540px; margin-bottom: 28px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; }
.hero-cta-sub { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 24px; }
.hero-cta-sub a {
  color: #94a3b8; font-size: 0.9rem; font-weight: 600; padding: 6px 12px;
  border-radius: 8px; transition: color .2s, background .2s;
}
.hero-cta-sub a:hover { color: #e2e8f0; background: rgba(255,255,255,0.08); }
.hero-meta { display: flex; gap: 20px; flex-wrap: wrap; color: #94a3b8; font-size: 0.85rem; }
.hero-meta strong { color: #e2e8f0; }

.hero-visual {
  position: relative;
  background: #000; border-radius: 28px; border: 6px solid #1e293b;
  overflow: hidden; aspect-ratio: 9 / 16; max-height: 560px; margin: 0 auto;
  box-shadow: 0 24px 60px rgba(0,0,0,0.4);
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  background: #fff; border-bottom: 1px solid var(--line); font-size: 0.85rem;
}
.breadcrumbs ol {
  max-width: var(--max-width); margin: 0 auto; padding: 10px 20px;
  display: flex; flex-wrap: wrap; gap: 6px; list-style: none; color: var(--muted);
}
.breadcrumbs li::after { content: "›"; margin-left: 6px; color: var(--line-strong); }
.breadcrumbs li:last-child::after { content: ""; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--brand-pink-dark); }
.breadcrumbs li:last-child { color: var(--ink); font-weight: 600; }

/* ===== Cards / grids ===== */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--card-shadow); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--card-shadow-hover); border-color: var(--brand-pink); }
.card-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(226,78,192,0.10), rgba(20,184,166,0.10));
  color: var(--brand-pink-dark); margin-bottom: 14px; font-size: 1.2rem;
}
.card-icon.teal { background: rgba(20,184,166,0.10); color: var(--brand-teal-dark); }
.card-icon.orange { background: rgba(194,65,12,0.10); color: #c2410c; }
.card h3 { margin-bottom: 8px; }
.card p:last-child { margin-bottom: 0; }

/* ===== Feature blocks ===== */
.feature-block {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.feature-block.reverse { direction: rtl; }
.feature-block.reverse > * { direction: ltr; }
.feature-img {
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--card-shadow-hover);
  aspect-ratio: 4 / 3;
}
.feature-img img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Pricing (3 static cards) ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.pricing-card {
  background: #fff; border: 2px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px; display: flex; flex-direction: column; box-shadow: var(--card-shadow);
  transition: border-color .2s, transform .2s;
}
.pricing-card:hover { transform: translateY(-4px); }
.pricing-card.featured { border-color: var(--brand-pink); }
.pricing-card.featured-teal { border-color: var(--brand-teal); }
.pricing-tag {
  align-self: flex-start; font-size: 0.7rem; font-weight: 800; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 4px 10px; border-radius: 999px; color: #fff;
  background: var(--brand-teal); margin-bottom: 12px;
}
.pricing-tag.pink { background: var(--brand-pink); }
.pricing-tag.orange { background: #f97316; }
.pricing-card h3 { font-size: 1.25rem; margin-bottom: 4px; }
.pricing-card .desc { color: var(--muted); font-size: 0.9rem; margin-bottom: 18px; }
.pricing-price {
  background: var(--soft-bg); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 16px; text-align: center; margin-bottom: 16px;
}
.pricing-price .label { display: block; color: var(--muted); font-size: 0.78rem; font-weight: 700; }
.pricing-price .amount {
  display: block; font-size: 1.85rem; font-weight: 900; color: var(--ink);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; margin-top: 4px;
}
.pricing-price .example { display: block; color: var(--muted); font-size: 0.78rem; margin-top: 4px; }
.pricing-addons { display: grid; gap: 8px; margin-bottom: 16px; }
.pricing-addon {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  background: var(--soft-bg); border: 1px solid var(--line);
  font-size: 0.88rem; font-weight: 600;
}
.pricing-addon .price { white-space: nowrap; color: var(--brand-pink-dark); }

/* ===== Comparison table ===== */
.compare-wrap {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: auto; box-shadow: var(--card-shadow);
}
.compare-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.compare-table th, .compare-table td {
  padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top;
}
.compare-table th { background: var(--soft-bg-2); color: var(--ink); font-weight: 700; }
.compare-table th:nth-child(2) { background: rgba(20,184,166,0.08); color: var(--brand-teal-dark); }
.compare-table th:nth-child(3) { background: rgba(226,78,192,0.08); color: var(--brand-pink-dark); }
.compare-table td:first-child { font-weight: 700; color: var(--ink); }
.compare-table tr:last-child td { border-bottom: 0; }

/* ===== Testimonials ===== */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--card-shadow); display: flex; flex-direction: column; gap: 16px;
}
.testimonial-quote {
  font-size: 0.98rem; line-height: 1.7; color: var(--ink-soft);
  border-left: 3px solid var(--brand-pink); padding-left: 14px; flex: 1;
}
.testimonial-quote::before { content: "“"; color: var(--brand-pink); font-size: 1.5rem; font-weight: 900; line-height: 0; margin-right: 2px; vertical-align: -0.3em; }
.testimonial-attribution { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-pink), var(--brand-teal));
  color: #fff; display: grid; place-items: center; font-weight: 800; font-size: 0.9rem;
}
.testimonial-name { font-weight: 700; color: var(--ink); font-size: 0.92rem; }
.testimonial-role { color: var(--muted); font-size: 0.82rem; }

/* ===== FAQ ===== */
.faq-list { display: grid; gap: 12px; max-width: 760px; margin: 0 auto; }
details.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 16px 20px; box-shadow: var(--card-shadow);
  transition: border-color .2s, box-shadow .2s;
}
details.faq-item[open] { border-color: var(--brand-pink); box-shadow: var(--card-shadow-hover); }
details.faq-item summary {
  cursor: pointer; font-weight: 700; color: var(--ink); list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: "+"; color: var(--brand-pink-dark); font-weight: 900; font-size: 1.3rem; transition: transform .2s;
}
details.faq-item[open] summary::after { transform: rotate(45deg); }
details.faq-item p { margin: 12px 0 0; color: var(--body); }

/* ===== Calculator ===== */
.calc-box {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--card-shadow);
}
.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.calc-fields { display: flex; flex-direction: column; gap: 14px; }
.calc-field { display: flex; flex-direction: column; gap: 6px; }
.calc-label {
  font-size: 0.85rem; font-weight: 600; color: var(--ink);
}
.calc-input-row { display: flex; align-items: center; gap: 8px; }
.calc-input {
  width: 100%; font-size: 1.1rem; font-weight: 600; padding: 10px 12px;
  border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm);
  background: var(--soft-bg); color: var(--ink);
  font-family: inherit; transition: border-color .2s, box-shadow .2s;
}
.calc-input:focus { border-color: var(--brand-pink); box-shadow: 0 0 0 3px rgba(226,78,192,0.12); outline: none; }
.calc-unit {
  font-size: 0.82rem; color: var(--muted); white-space: nowrap; flex-shrink: 0;
  font-weight: 500;
}
/* mode toggle */
.calc-toggle-row { display: flex; border-radius: var(--radius-sm); overflow: hidden; border: 1.5px solid var(--line-strong); }
.calc-toggle {
  flex: 1; padding: 10px 12px; font-size: 0.82rem; font-weight: 600;
  color: var(--muted); background: var(--soft-bg); border: none; cursor: pointer;
  transition: background .15s, color .15s; text-align: center; white-space: nowrap;
  font-family: inherit;
}
.calc-toggle:first-child { border-right: 1.5px solid var(--line-strong); }
.calc-toggle.active {
  background: rgba(226,78,192,0.10); color: var(--brand-pink-dark); font-weight: 700;
}
.calc-toggle:hover:not(.active) { color: var(--ink); }
/* language checkboxes */
.calc-lang-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.calc-lang {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 12px;
  border: 1.5px solid var(--line-strong); border-radius: var(--radius-sm);
  background: var(--soft-bg); cursor: pointer; font-size: 0.9rem;
  user-select: none; color: var(--ink-soft); font-weight: 500;
  transition: border-color .15s, background .15s;
}
.calc-lang input { position: absolute; opacity: 0; width: 0; height: 0; }
.calc-lang .check {
  width: 18px; height: 18px; border-radius: 5px;
  border: 2px solid var(--line-strong); display: inline-flex;
  align-items: center; justify-content: center; flex-shrink: 0;
  transition: background .15s, border-color .15s;
}
.calc-lang.checked {
  border-color: var(--brand-pink); background: rgba(226,78,192,0.06);
  color: var(--brand-pink-dark); font-weight: 600;
}
.calc-lang.checked .check { background: var(--brand-pink); border-color: var(--brand-pink); }
.calc-lang.checked .check::after {
  content: ''; width: 5px; height: 9px;
  border: solid #fff; border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}
/* result column */
.calc-result {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; text-align: center; gap: 8px;
  border-left: 1px solid var(--line); padding-left: 20px;
}
.calc-result-label { font-size: 0.9rem; font-weight: 600; color: var(--muted); }
.calc-result-price {
  font-size: 2.2rem; font-weight: 700; color: var(--ink); line-height: 1.1;
}
.calc-result-loading { font-size: 0.88rem; color: var(--muted); }
@media (max-width: 768px) {
  .calc-grid { grid-template-columns: 1fr; }
  .calc-result { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 16px; margin-top: 4px; }
}

/* ===== Contact form (dark-bg inputs inside cta-banner) ===== */
.contact-form .form-input {
  width: 100%; padding: 12px 14px; border-radius: var(--radius-sm);
  border: 1.5px solid rgba(255,255,255,0.2); background: rgba(255,255,255,0.08);
  color: #fff; font-size: 0.95rem; font-family: inherit;
  transition: border-color .2s, box-shadow .2s;
}
.contact-form .form-input::placeholder { color: rgba(255,255,255,0.45); }
.contact-form .form-input:focus {
  border-color: var(--brand-pink); box-shadow: 0 0 0 3px rgba(226,78,192,0.25);
  outline: none; background: rgba(255,255,255,0.12);
}
.contact-form textarea.form-input { min-height: 100px; }

/* ===== Flow steps ===== */
.flow-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.flow-step {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--card-shadow);
  counter-increment: step;
}
.flow-step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; top: 16px; right: 18px;
  font-size: 2.2rem; font-weight: 900; color: rgba(226,78,192,0.18); line-height: 1;
}
.flow-step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.flow-step p { font-size: 0.9rem; margin: 0; }

/* ===== CTA banner ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--brand-navy) 0%, #1e293b 100%);
  color: #fff; border-radius: var(--radius-lg); padding: 40px;
  display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; align-items: center;
  position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ""; position: absolute; top: -50%; right: -10%;
  width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(226,78,192,0.20), transparent 70%);
}
.cta-banner h2 { color: #fff; position: relative; }
.cta-banner p { color: #cbd5e1; margin-bottom: 0; position: relative; }
.cta-banner-actions { display: flex; flex-direction: column; gap: 12px; position: relative; }

/* ===== Two-column card row (presentation / guide links) ===== */
.link-card {
  display: grid; grid-template-columns: 1.5fr 1fr; gap: 24px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 28px; box-shadow: var(--card-shadow); position: relative; overflow: hidden;
}
.link-card .lc-eyebrow {
  font-size: 0.72rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--brand-pink-dark); margin-bottom: 8px;
}
.link-card.teal .lc-eyebrow { color: var(--brand-teal-dark); }
.link-card h3 { font-size: 1.35rem; margin-bottom: 8px; }
.link-card p { color: var(--muted); font-size: 0.95rem; margin: 0; }
.link-card-actions { display: flex; flex-direction: column; gap: 8px; }

/* ===== Footer ===== */
.footer {
  background: var(--brand-navy); color: #cbd5e1; padding: 48px 0 24px; margin-top: 0;
}
.footer-grid {
  max-width: var(--max-width); margin: 0 auto; padding: 0 20px;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; color: #fff; font-weight: 800; font-size: 1.1rem; }
.footer h4 { color: #fff; font-size: 0.95rem; margin-bottom: 12px; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer a { color: #94a3b8; font-size: 0.9rem; }
.footer a:hover { color: #fff; }
.footer-bottom {
  max-width: var(--max-width); margin: 32px auto 0; padding: 20px 20px 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 0.82rem; color: #64748b;
}

/* ===== Back to top ===== */
.back-to-top {
  position: fixed; right: 20px; bottom: 20px; z-index: 50;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--brand-pink); color: #fff; border: 0; cursor: pointer;
  font-size: 1.4rem; font-weight: 700; box-shadow: 0 6px 20px rgba(226,78,192,0.4);
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-2px); }

/* ===== Mobile floating CTA ===== */
.mobile-cta {
  display: none; position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 60;
  padding: 14px 20px; border-radius: var(--radius); background: var(--brand-pink); color: #fff;
  font-weight: 800; text-align: center; box-shadow: 0 10px 30px rgba(226,78,192,0.4);
}

/* ===== Essay layout ===== */
.essay-layout {
  max-width: var(--max-width); margin: 0 auto; padding: 32px 20px;
  display: grid; grid-template-columns: 1fr 280px; gap: 48px; align-items: start;
}
.essay-body { min-width: 0; }
.essay-body h2 { margin-top: 2em; margin-bottom: 0.6em; padding-top: 0.5em; }
.essay-body h2:first-of-type { margin-top: 1em; }
.essay-body p, .essay-body li { color: var(--body); }
.essay-body ul, .essay-body ol { padding-left: 1.4em; }
.essay-hero { margin-bottom: 32px; }
.essay-hero img { border-radius: var(--radius-lg); box-shadow: var(--card-shadow); width: 100%; }
.toc {
  position: sticky; top: 88px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--card-shadow);
}
.toc h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin-bottom: 12px; }
.toc ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.toc li { border-bottom: 1px solid var(--line); }
.toc li:last-child { border-bottom: 0; }
.toc a { display: block; padding: 10px 0; color: var(--ink-soft); font-size: 0.92rem; font-weight: 500; }
.toc a:hover { color: var(--brand-pink-dark); }
.toc-extra { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); }

/* ===== Essay hub grid ===== */
.essay-card {
  display: flex; flex-direction: column; gap: 8px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--card-shadow); transition: border-color .2s, transform .2s;
}
.essay-card:hover { transform: translateY(-2px); border-color: var(--brand-pink); }
.essay-card .tag {
  align-self: flex-start;
  font-size: 0.72rem; font-weight: 800; padding: 4px 10px; border-radius: 999px;
  background: rgba(20,184,166,0.10); color: var(--brand-teal-dark); margin-bottom: 8px;
}
.essay-card h3 { font-size: 1.05rem; line-height: 1.4; }
.essay-card h3 .num { color: var(--brand-pink-dark); margin-right: 6px; }
.essay-card p { color: var(--muted); font-size: 0.9rem; margin: 0; }
.essay-card .read-more { color: var(--brand-pink-dark); font-weight: 700; font-size: 0.88rem; margin-top: auto; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero-visual { max-width: 360px; }
  .feature-block { grid-template-columns: 1fr; gap: 24px; }
  .feature-block.reverse { direction: ltr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .essay-layout { grid-template-columns: 1fr; }
  .toc { position: static; top: auto; }
}

@media (max-width: 768px) {
  section { padding: 48px 0; }
  .topbar-inner { gap: 10px; padding: 10px 16px; }
  .brand-link img { width: 100px; }
  .topbar-nav { flex-wrap: nowrap; gap: 4px; }
  .topbar-nav a:not(.btn) { display: none; }
  .topbar-nav .btn { padding: 7px 10px; font-size: 0.82rem; white-space: nowrap; }
  .topbar-nav .lang-select { padding: 5px 4px; font-size: 0.78rem; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: 1fr 1fr; }
  .link-card { grid-template-columns: 1fr; }
  .link-card-actions { flex-direction: row; }
  .cta-banner { grid-template-columns: 1fr; padding: 28px; }
  .cta-banner-actions { flex-direction: row; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .compare-table { min-width: 0; }
  .compare-table, .compare-wrap { display: block; }
  .compare-wrap { overflow: visible; border: 0; box-shadow: none; }
  .compare-table thead { display: none; }
  .compare-table tbody, .compare-table tr, .compare-table td { display: block; width: 100%; }
  .compare-table tr {
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius-sm);
    margin-bottom: 12px; padding: 8px; box-shadow: var(--card-shadow);
  }
  .compare-table td {
    border-bottom: 1px solid var(--line); padding: 12px 14px; text-align: right;
  }
  .compare-table td::before {
    content: attr(data-label); float: left; font-weight: 700; color: var(--ink);
  }
  .compare-table td:last-child { border-bottom: 0; }
  .mobile-cta { display: block; }
  .flow-steps { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}