:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-elevated: #ffffff;
  --text: #111111;
  --text-soft: #6e6e73;
  --accent: #0071e3;
  --accent-soft: rgba(0, 113, 227, 0.08);
  --border-subtle: #d2d2d7;
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.08);
  --radius-large: 24px;
  --radius-medium: 16px;
  --radius-pill: 999px;
  --transition-fast: 0.18s ease-out;
  --transition-med: 0.25s ease-out;
  --max-width: 1120px;
}

body.theme-dark {
  --bg: #000000;
  --bg-alt: #111111;
  --bg-elevated: #1c1c1e;
  --text: #ffffff;
  --text-soft: #a1a1aa;
  --border-subtle: #2c2c2e;
  --shadow-soft: 0 24px 60px rgba(0, 0, 0, 0.8);
  --accent-soft: rgba(10, 132, 255, 0.16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
    system-ui, -system-ui, sans-serif;
  background: radial-gradient(circle at top, #f0f0f4 0, var(--bg) 36%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;

  /* Space for fixed header and footer (adjust if needed) */
  padding-top: 72px;   /* header height space */
  padding-bottom: 80px; /* footer height space */
}

body.theme-dark {
  background: radial-gradient(circle at top, #18181b 0, var(--bg) 40%);
}

img {
  max-width: 100%;
  display: block;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Skip link */

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--bg-elevated);
  color: var(--text);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-soft);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 12px;
}

/* Header */

.site-header {
  position: fixed;       /* always visible */
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid rgba(120, 120, 128, 0.08);
}

.minimal-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  border-bottom: 1px solid rgba(120, 120, 128, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.brand-logo {
  height: 30px;
  width: auto;
}

.brand-text {
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 13px;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
}

.nav-link {
  font-size: 14px;
  color: var(--text-soft);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
  transition: width var(--transition-med);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--text);
}

.nav-link.is-active::after,
.nav-link:hover::after {
  width: 100%;
}

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

.header-search input {
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  padding: 6px 12px;
  font-size: 13px;
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  min-width: 140px;
}

.header-search input::placeholder {
  color: var(--text-soft);
}

.icon-button {
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  padding: 6px 10px;
  font-size: 14px;
  cursor: pointer;
}

.language-switcher {
  display: inline-flex;
  padding: 3px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 3px 10px;
  font-size: 12px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  color: var(--text-soft);
}

.lang-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  flex-direction: column;
  gap: 4px;
  padding: 6px;
}

.menu-toggle span {
  width: 18px;
  height: 1.5px;
  background: var(--text);
  border-radius: 999px;
}

/* Hero */

.hero {
  padding: 48px 0 24px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 40px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(32px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

.hero-subtitle {
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-soft);
  max-width: 520px;
  margin-bottom: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}

.hero-note {
  font-size: 13px;
  color: var(--text-soft);
}

.hero-visual {
  position: relative;
  display: grid;
  gap: 16px;
}

.hero-card {
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  border-radius: var(--radius-large);
  padding: 16px 18px;
  display: flex;
  gap: 16px;
  justify-content: space-between;
  border: 1px solid rgba(120, 120, 128, 0.18);
  box-shadow: var(--shadow-soft);
}

.hero-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-metric-number {
  font-weight: 600;
  font-size: 18px;
}

.hero-metric-label {
  font-size: 12px;
  color: var(--text-soft);
}

.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-large);
  overflow: hidden;
  border: 1px solid rgba(120, 120, 128, 0.16);
}

.hero-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  transform: scale(1.02);
  transition: transform 10s ease-out;
}

.hero-image-wrapper:hover .hero-image {
  transform: scale(1.06);
}

.hero-glow {
  position: absolute;
  inset: auto 12% -40%;
  height: 120px;
  background: radial-gradient(circle at 50% 0, var(--accent-soft), transparent);
}

/* Sections */

.section {
  padding: 48px 0;
}

.section-light {
  background: var(--bg-alt);
}

.section-cta {
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border-top: 1px solid rgba(120, 120, 128, 0.12);
}

.section-header {
  margin-bottom: 26px;
}

.section-header h2 {
  margin: 0 0 6px;
  font-size: 24px;
}

.section-header p {
  margin: 0;
  color: var(--text-soft);
  max-width: 520px;
}

.section-header.with-link {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
}

/* Buttons & links */

.btn {
  border-radius: var(--radius-pill);
  border: none;
  padding: 9px 18px;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.btn-ghost {
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  color: var(--text);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover {
  background: color-mix(in srgb, var(--bg-elevated) 100%, var(--accent-soft));
  border-color: var(--accent);
}

.btn-link {
  border: none;
  background: transparent;
  padding: 0;
  font-size: 14px;
  color: var(--accent);
  cursor: pointer;
}

.text-link,
.btn-link {
  position: relative;
}

.text-link::after,
.btn-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition-med);
}

.text-link:hover::after,
.btn-link:hover::after {
  width: 100%;
}

/* Cards & grids */

.grid {
  display: grid;
  gap: 22px;
}

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

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

.cards-stretch > * {
  height: 100%;
}

.card {
  background: var(--bg-elevated);
  border-radius: var(--radius-large);
  padding: 20px 18px 20px;
  border: 1px solid rgba(120, 120, 128, 0.18);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    border-color var(--transition-fast), background var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 55px rgba(0, 0, 0, 0.16);
  border-color: var(--accent-soft);
}

.card h3,
.card h2 {
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 17px;
}

.card p {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--text-soft);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  background: var(--accent-soft);
}

.badge-outline {
  background: transparent;
  border: 1px solid var(--border-subtle);
}

/* Book slider */

.book-section {
  padding-top: 24px;
}

.book-slider {
  margin-top: 12px;
}

.book-shell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  border-radius: var(--radius-large);
  overflow: hidden;
  background: var(--bg-elevated);
  border: 1px solid rgba(120, 120, 128, 0.18);
  box-shadow: var(--shadow-soft);
  min-height: 260px;
}

.book-spine {
  width: 16px;
  background: linear-gradient(180deg, #d3d3d8, #fefefe);
  border-right: 1px solid rgba(120, 120, 128, 0.25);
}

body.theme-dark .book-spine {
  background: linear-gradient(180deg, #3a3a3c, #1c1c1e);
}

.book-pages {
  position: relative;
  overflow: hidden;
}

.book-track {
  display: flex;
  width: 300%;
  transform: translateX(0);
  transition: transform 0.5s ease-out;
}

.book-slide {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 24px;
  padding: 20px 22px;
  align-items: center;
}

.book-content p {
  font-size: 14px;
}

.book-bullets {
  margin: 10px 0 12px;
  padding-left: 20px;
  font-size: 13px;
  color: var(--text-soft);
}

.book-media img {
  border-radius: 18px;
  height: 180px;
  width: 100%;
  object-fit: cover;
}

.book-controls {
  display: flex;
  justify-content: center;
  margin-top: 12px;
  gap: 8px;
}

.book-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--border-subtle);
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast);
}

.book-dot.is-active {
  background: var(--accent);
  transform: scale(1.2);
}

/* About preview */

.about-preview {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 32px;
  align-items: center;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.stat-block {
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  border-radius: 18px;
  padding: 14px 12px;
  border: 1px solid rgba(120, 120, 128, 0.18);
}

.stat-number {
  display: block;
  font-weight: 600;
  font-size: 20px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-soft);
}

.stat-note {
  grid-column: 1 / -1;
  font-size: 11px;
  color: var(--text-soft);
}

/* CTA */

.section-cta .cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.section-cta h2 {
  margin: 0 0 6px;
}

.section-cta p {
  margin: 0;
  color: var(--text-soft);
}

/* Page hero */

.page-hero {
  padding: 48px 0 24px;
}

.page-hero.center {
  text-align: center;
}

.page-eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 10px;
}

.page-hero h1 {
  font-size: clamp(28px, 3.2vw, 36px);
  margin: 0 0 10px;
}

.page-hero p {
  margin: 0;
  color: var(--text-soft);
  max-width: 620px;
}

.page-hero.center p {
  margin-left: auto;
  margin-right: auto;
}

.form-error {
  margin-top: 16px;
  color: #b3261e;
  font-size: 13px;
}

/* Tabs */

.tab-controls {
  display: inline-flex;
  padding: 3px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: color-mix(in srgb, var(--bg-elevated) 92%, transparent);
  margin-bottom: 20px;
}

.tab-btn {
  border: none;
  background: transparent;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  cursor: pointer;
  color: var(--text-soft);
}

.tab-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

/* Forms */

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 26px;
  align-items: flex-start;
}

.contact-form-wrapper {
  background: var(--bg-elevated);
  border-radius: var(--radius-large);
  padding: 20px 18px;
  border: 1px solid rgba(120, 120, 128, 0.18);
  box-shadow: var(--shadow-soft);
}

.contact-form {
  display: grid;
  gap: 14px;
}

.form-field label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  padding: 8px 10px;
  font-size: 14px;
  background: color-mix(in srgb, var(--bg-elevated) 96%, transparent);
  color: var(--text);
}

.form-field textarea {
  resize: vertical;
}

.contact-info .card {
  margin-bottom: 16px;
}

.map-card .map-placeholder {
  border-radius: 16px;
  border: 1px dashed var(--border-subtle);
  padding: 24px 16px;
  font-size: 13px;
  color: var(--text-soft);
}

/* About page layout */

.about-page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  gap: 32px;
}

.about-aside .stat-card {
  margin-bottom: 12px;
}

/* Footer – fixed at bottom */

.site-footer {
  position: fixed;        /* always visible at bottom */
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  border-top: 1px solid rgba(120, 120, 128, 0.16);
  padding: 16px 0;
  background: color-mix(in srgb, var(--bg-elevated) 96%, transparent);
  backdrop-filter: blur(18px);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  font-size: 13px;
}

.footer-brand {
  font-weight: 600;
  margin: 0 0 4px;
}

.footer-text {
  margin: 0;
  color: var(--text-soft);
  max-width: 260px;
}

.footer-right nav {
  display: flex;
  gap: 14px;
  margin-bottom: 6px;
}

.footer-right nav a {
  color: var(--text-soft);
}

.footer-right nav a:hover {
  color: var(--text);
}

.footer-meta {
  margin: 0;
  color: var(--text-soft);
  display: flex;
  gap: 12px;
}

/* Floating chat button */

.floating-chat {
  position: fixed;
  right: 16px;
  bottom: 16px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  background: #25d366;
  color: #fff;
  font-size: 13px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
  z-index: 50;
}

/* Utility */

.bullet-list {
  padding-left: 18px;
  margin: 8px 0 12px;
  font-size: 13px;
  color: var(--text-soft);
}

/* Responsive */

@media (max-width: 900px) {
  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav.is-open {
    position: absolute;
    inset: 60px 0 auto;
    background: var(--bg-elevated);
    border-bottom: 1px solid rgba(120, 120, 128, 0.12);
    padding: 10px 16px 16px;
  }

  .main-nav.is-open ul {
    flex-direction: column;
    gap: 10px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-visual {
    order: -1;
  }

  .cards-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .contact-layout,
  .about-preview,
  .about-page-layout {
    grid-template-columns: 1fr;
  }

  .section-cta .cta-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .cards-3,
  .cards-2 {
    grid-template-columns: 1fr;
  }

  .hero-card {
    flex-direction: column;
    gap: 8px;
  }

  .book-slide {
    grid-template-columns: minmax(0, 1fr);
  }

  .header-actions {
    gap: 8px;
  }

  .header-search {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
  }
}