@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --brand-50: #f5f4ff;
  --brand-100: #ebeaff;
  --brand-500: #7b73ff;
  --brand-600: #635bff;
  --brand-700: #4f47e0;
  --ink-950: #0f172a;
  --ink-900: #111827;
  --ink-700: #334155;
  --ink-600: #475569;
  --ink-500: #64748b;
  --line: #dbe3ef;
  --surface: #ffffff;
  --surface-soft: rgba(255, 255, 255, 0.84);
  --page: #f8fafc;
  --shadow-soft: 0 24px 60px rgba(15, 23, 42, 0.08);
  --shadow-card: 0 16px 36px rgba(15, 23, 42, 0.06);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --container: 1180px;
}

body[data-theme="fuly"] {
  --accent-soft: rgba(14, 165, 233, 0.12);
  --accent-strong: #0f766e;
  --hero-glow: radial-gradient(circle at top left, rgba(14, 165, 233, 0.16), transparent 45%);
}

body[data-theme="build"] {
  --accent-soft: rgba(99, 91, 255, 0.14);
  --accent-strong: #4f47e0;
  --hero-glow: radial-gradient(circle at top left, rgba(99, 91, 255, 0.18), transparent 45%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  color: var(--ink-900);
  background:
    radial-gradient(circle at top right, rgba(99, 91, 255, 0.08), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, var(--page) 46%, #eef3f8 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.68) 0, rgba(255, 255, 255, 0.68) 1px, transparent 1px, transparent 100%),
    linear-gradient(rgba(255, 255, 255, 0.78) 0, rgba(255, 255, 255, 0.78) 1px, transparent 1px, transparent 100%);
  background-size: 52px 52px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.18), transparent 78%);
  pointer-events: none;
  opacity: 0.35;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

button,
input,
select {
  font: inherit;
}

.page-shell {
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(20px);
  background: rgba(248, 250, 252, 0.82);
  border-bottom: 1px solid rgba(219, 227, 239, 0.82);
}

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
}

.header-inner,
.hero-grid,
.section-grid,
.footer-inner {
  display: grid;
  gap: 24px;
}

.header-inner {
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 76px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--ink-950);
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--brand-600), var(--accent-strong));
  color: #ffffff;
  box-shadow: 0 12px 28px rgba(79, 70, 229, 0.2);
  font-size: 18px;
  font-weight: 700;
}

.brand-stack {
  display: grid;
  gap: 2px;
}

.brand-name {
  font-size: 15px;
  font-weight: 700;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--ink-500);
}

.primary-nav {
  display: inline-flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.primary-nav a {
  color: var(--ink-600);
  font-size: 14px;
  font-weight: 500;
}

.primary-nav a:hover,
.primary-nav a:focus-visible {
  color: var(--ink-950);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-content: flex-end;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.lang-switcher a {
  min-width: 42px;
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-500);
}

.lang-switcher a[aria-current="page"] {
  color: var(--brand-700);
  background: var(--brand-50);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
}

.btn-primary {
  color: #ffffff;
  background: var(--brand-600);
  box-shadow: 0 16px 32px rgba(99, 91, 255, 0.18);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--brand-700);
}

.btn-secondary {
  color: var(--ink-700);
  background: rgba(255, 255, 255, 0.92);
  border-color: var(--line);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: #c4d0e0;
  background: #ffffff;
}

.btn-ghost {
  color: var(--ink-600);
  background: transparent;
}

.section {
  padding: 72px 0;
}

.hero {
  padding: 40px 0 48px;
}

.hero-grid,
.section-grid {
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  align-items: start;
}

.hero-copy,
.stack,
.card-stack,
.kpi-row,
.footer-links,
.feature-list,
.result-stack,
.timeline,
.faq-list,
.tab-panels,
.tab-panel,
.output-card {
  display: grid;
  gap: 18px;
}

.eyebrow {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(99, 91, 255, 0.18);
  background: rgba(255, 255, 255, 0.84);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-strong);
}

.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--brand-600);
  box-shadow: 0 0 0 8px rgba(99, 91, 255, 0.12);
}

.hero-title,
.section-title,
.cta-title {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--ink-950);
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 4.9rem);
  line-height: 0.98;
  max-width: 12ch;
}

.section-title,
.cta-title {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.05;
}

.accent {
  color: var(--brand-600);
}

.hero-subtitle,
.section-copy,
.card-copy,
.panel-copy,
.kpi-label,
.footer-note,
.faq-answer,
.demo-note,
.muted {
  color: var(--ink-600);
}

.hero-subtitle,
.section-copy {
  font-size: 18px;
  line-height: 1.65;
  max-width: 58ch;
}

.hero-actions,
.inline-actions,
.pill-row,
.tab-list,
.metric-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pill-row {
  gap: 10px;
}

.pill,
.metric-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(219, 227, 239, 0.86);
  color: var(--ink-700);
  font-size: 13px;
  font-weight: 500;
}

.surface-card,
.hero-panel,
.calculator-card,
.preview-shell,
.tab-shell,
.faq-item,
.cta-card,
.output-card,
.kpi-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(219, 227, 239, 0.95);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.97), rgba(248, 250, 252, 0.98));
  box-shadow: var(--shadow-soft);
}

.hero-panel,
.calculator-card,
.preview-shell,
.tab-shell,
.cta-card {
  padding: 24px;
}

.surface-card::before,
.hero-panel::before,
.calculator-card::before,
.preview-shell::before,
.tab-shell::before,
.cta-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--hero-glow);
  pointer-events: none;
}

.panel-head,
.section-head,
.tab-header,
.output-head {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 8px;
}

.section-head {
  margin-bottom: 28px;
}

.kpi-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.kpi-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.86);
}

.kpi-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-950);
}

.kpi-label {
  font-size: 13px;
  line-height: 1.5;
}

.feature-grid,
.card-grid,
.timeline-grid {
  display: grid;
  gap: 18px;
}

.card-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-grid,
.timeline-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.info-card,
.timeline-card,
.process-step {
  padding: 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow-card);
}

.info-card h3,
.timeline-card h3,
.process-step h3,
.tab-panel h3,
.output-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
}

.info-card p,
.timeline-card p,
.process-step p,
.tab-panel p,
.output-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-600);
}

.field-grid {
  display: grid;
  gap: 16px;
}

.form-row {
  display: grid;
  gap: 8px;
}

.form-row label,
.legend {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-700);
}

.input,
.select {
  width: 100%;
  min-height: 48px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid #cad5e4;
  background: #ffffff;
  color: var(--ink-900);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.input:focus,
.select:focus,
.tab-button:focus-visible,
.faq-button:focus-visible,
.btn:focus-visible,
.lang-switcher a:focus-visible,
.primary-nav a:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(99, 91, 255, 0.12);
  border-color: var(--brand-500);
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.choice-card {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  cursor: pointer;
}

.choice-card input {
  accent-color: var(--brand-600);
}

.choice-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-900);
}

.choice-copy {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-500);
}

.result-stack[hidden],
.tab-panel[hidden],
.faq-answer[hidden],
.preview-block[hidden] {
  display: none;
}

.result-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.output-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.92);
}

.output-value {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--ink-950);
}

.output-detail {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-600);
}

.preview-shell {
  display: grid;
  gap: 16px;
}

.preview-block {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(15, 23, 42, 0.96);
  color: #f8fafc;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.preview-label {
  display: inline-flex;
  margin-bottom: 10px;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #dbeafe;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.preview-copy {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.timeline {
  counter-reset: timeline;
}

.timeline-card {
  position: relative;
  padding-left: 60px;
}

.timeline-card::before {
  counter-increment: timeline;
  content: counter(timeline);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--brand-600);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
}

.tab-list {
  margin-top: 8px;
}

.tab-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink-600);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.tab-button.is-active {
  background: var(--brand-50);
  color: var(--brand-700);
  border-color: rgba(99, 91, 255, 0.24);
}

.tab-panel {
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
}

.faq-item {
  padding: 0;
}

.faq-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  border: 0;
  background: transparent;
  color: var(--ink-950);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}

.faq-answer {
  padding: 0 20px 20px;
  font-size: 15px;
  line-height: 1.7;
}

.cta-card {
  padding: 28px;
}

.cta-actions,
.footer-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.footer {
  padding: 28px 0 40px;
}

.footer-inner {
  grid-template-columns: 1fr auto;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid rgba(219, 227, 239, 0.86);
}

.footer-links a {
  color: var(--ink-600);
  font-size: 14px;
}

.fade-up {
  opacity: 0;
  transform: translateY(18px);
  animation: fade-up 720ms ease forwards;
}

.fade-up.delay-1 {
  animation-delay: 80ms;
}

.fade-up.delay-2 {
  animation-delay: 160ms;
}

.fade-up.delay-3 {
  animation-delay: 240ms;
}

@keyframes fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1040px) {
  .header-inner,
  .hero-grid,
  .section-grid,
  .footer-inner,
  .card-grid,
  .feature-grid,
  .timeline-grid,
  .result-summary,
  .kpi-row {
    grid-template-columns: 1fr;
  }

  .header-inner {
    padding: 14px 0;
  }

  .primary-nav {
    justify-content: flex-start;
  }
}

@media (max-width: 760px) {
  .site-header {
    position: static;
  }

  .container {
    width: min(var(--container), calc(100% - 24px));
  }

  .header-inner {
    grid-template-columns: 1fr;
    justify-items: start;
    gap: 14px;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 24px;
  }

  .hero-title {
    max-width: 100%;
  }

  .hero-actions,
  .inline-actions,
  .cta-actions,
  .choice-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .inline-actions,
  .cta-actions {
    display: grid;
  }

  .choice-grid {
    display: grid;
  }

  .btn,
  .tab-button {
    width: 100%;
  }

  .primary-nav {
    gap: 14px;
  }

  .section {
    padding: 56px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-up,
  .fade-up.delay-1,
  .fade-up.delay-2,
  .fade-up.delay-3 {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .btn,
  .tab-button {
    transition: none;
  }
}