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

:root {
  --bg: #f9fafb;
  --bg-white: #ffffff;
  --bg-subtle: #f3f4f6;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --accent: #ef4444;
  --accent-hover: #dc2626;
  --accent-light: #fef2f2;
  --accent-border: #fecaca;
  --success: #10b981;
  --success-surface: #ecfdf5;
  --error: #ef4444;
  --border: #e5e7eb;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --transition: 0.2s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1117;
  --bg-white: #1a1d27;
  --bg-subtle: #141820;
  --bg-muted: #222633;
  --text-primary: #f3f4f6;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --accent-light: rgba(239, 68, 68, 0.14);
  --accent-border: rgba(239, 68, 68, 0.35);
  --success-surface: rgba(16, 185, 129, 0.16);
  --border: #2d3348;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

html[data-theme="dark"] .header {
  background: rgba(26, 29, 39, 0.92);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

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

.hidden {
  display: none !important;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
}

.btn-full {
  width: 100%;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-icon {
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a.nav-tab.active {
  color: var(--accent);
  font-weight: 600;
}

.nav-cta {
  background: var(--accent) !important;
  color: white !important;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600 !important;
}

.nav-cta:hover {
  background: var(--accent-hover) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
  padding: 140px 0 80px;
  background: var(--bg);
}

.hero-bg {
  display: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-light);
  border: 1px solid var(--accent-border);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero-badge-icon {
  font-size: 0.9rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 4.5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-trust {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px 28px;
}

.hero-trust li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.925rem;
  color: var(--text-secondary);
}

.hero-trust svg {
  color: var(--success);
  flex-shrink: 0;
}

/* ===== Demo Form Card ===== */
.demo-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
}

.demo-card-header h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.demo-card-header p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  margin-bottom: 24px;
}

.demo-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.optional {
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group input.error,
.form-group select.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
  cursor: pointer;
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: -8px 0 14px;
}

.form-hint.error {
  color: var(--error);
}

.form-disclaimer {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 12px;
}

.form-success {
  text-align: center;
  padding: 40px 20px;
}

.success-icon {
  width: 56px;
  height: 56px;
  background: #ecfdf5;
  color: var(--success);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 16px;
}

.form-success h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.form-success p {
  color: var(--text-secondary);
}

/* ===== Section Headers ===== */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.125rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  max-width: 600px;
  margin: 0 auto;
  color: var(--text-primary);
}

/* ===== Audio Section ===== */
.audio-section {
  padding: 80px 0;
  background: var(--bg-white);
  border-top: 1px solid var(--border);
}

.audio-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.audio-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color var(--transition);
}

.audio-card:hover {
  border-color: #d1d5db;
}

.audio-card-icon {
  font-size: 1.75rem;
  width: 48px;
  height: 48px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.audio-card-info h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.audio-card-info p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.audio-player {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
}

.play-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition);
}

.play-btn:hover {
  background: var(--accent-hover);
}

.progress-bar {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.1s linear;
}

.audio-time {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
}

/* ===== Features ===== */
.features {
  padding: 80px 0;
  background: var(--bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: border-color var(--transition);
}

.feature-card:hover {
  border-color: #d1d5db;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.925rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ===== Calculator ===== */
.calculator {
  padding: 80px 0;
  background: var(--bg-white);
  border-top: 1px solid var(--border);
}

.calc-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 720px;
  margin: 0 auto;
}

.calc-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.calc-stat {
  text-align: center;
  padding: 20px 16px;
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.calc-stat.highlight {
  background: var(--accent-light);
  border-color: var(--accent-border);
}

.calc-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.calc-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.calc-stat.highlight .calc-value {
  color: var(--accent);
}

.calc-sliders {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 24px;
}

.slider-group label {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-primary);
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.slider-value {
  font-size: 0.925rem;
  font-weight: 700;
  color: var(--accent);
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid white;
  box-shadow: var(--shadow-sm);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  border: 2px solid white;
  cursor: pointer;
}

.slider-range {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.calc-annual {
  text-align: center;
  padding: 20px;
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.calc-annual-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.calc-annual-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.calc-annual-note {
  font-size: 0.925rem;
  color: var(--text-secondary);
}

/* ===== FAQ ===== */
.faq {
  padding: 80px 0;
  background: var(--bg);
}

.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item[open] {
  border-color: #d1d5db;
}

.faq-item summary {
  padding: 18px 20px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 20px 18px;
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.65;
}

/* ===== Contact ===== */
.contact {
  padding: 80px 0;
  background: var(--bg-white);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-info h2 {
  font-size: 1.875rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.contact-info > p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.contact-email {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent);
  transition: color var(--transition);
}

.contact-email:hover {
  color: var(--accent-hover);
}

.contact-note {
  margin-top: 14px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.contact-form {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}

/* ===== Demo Booking Modal ===== */
body.modal-open {
  overflow: hidden;
}

.demo-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.demo-modal.hidden {
  display: none;
}

.demo-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  backdrop-filter: blur(4px);
}

.demo-modal-panel {
  position: relative;
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.demo-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.demo-modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.demo-modal-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.demo-modal-close {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-white);
  color: var(--text-secondary);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}

.demo-modal-close:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.demo-modal-body {
  flex: 1;
  overflow: auto;
  min-height: 520px;
}

#my-cal-inline-demo-booking {
  width: 100%;
  min-height: 520px;
}

@media (max-width: 768px) {
  .demo-modal {
    padding: 12px;
  }

  .demo-modal-panel {
    max-height: 95vh;
  }

  .demo-modal-header {
    padding: 16px;
  }

  .demo-modal-body,
  #my-cal-inline-demo-booking {
    min-height: 460px;
  }
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-white);
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 6px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-trust {
    justify-content: center;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .audio-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .calc-results {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-white);
    padding: 20px 24px;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .demo-form .form-row {
    grid-template-columns: 1fr;
  }

  .demo-card {
    padding: 24px 20px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}