/* ── US Landing Page Design System & Aesthetics ─────────────────────────
 * Modern, high-end direct-response edtech design system tailored for US buyers.
 * Palette: Deep obsidian (#090D16, #121827), Electric Indigo (#6366F1),
 * Violet Glow (#8B5CF6), Emerald Trust (#10B981), Warm Gold (#F59E0B).
 */

:root {
  --us-bg-dark: #f9f9f9;
  --us-bg-card: #ffffff;
  --us-bg-card-hover: #f3f3f4;
  --us-border: #e5e5e5;
  --us-border-highlight: #0a0a0a;
  --us-text-main: #0a0a0a;
  --us-text-sub: #595959;
  --us-text-muted: #8c8c8c;
  --us-indigo: #0a0a0a;
  --us-indigo-glow: none;
  --us-violet: #262626;
  --us-emerald: #0a0a0a;
  --us-amber: #0a0a0a;
  --us-gold: #0a0a0a;
  --us-radius-sm: 0px;
  --us-radius-md: 0px;
  --us-radius-lg: 0px;
  --us-font-heading: 'Inter', -apple-system, sans-serif;
  --us-font-body: 'Inter', -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--us-bg-dark);
  color: var(--us-text-main);
  font-family: var(--us-font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Container & Grid Utilities ────────────────────────────────────────── */
.us-container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ── Sticky Urgency Banner ────────────────────────────────────────────── */
.us-urgency-banner {
  background: linear-gradient(90deg, #4f46e5 0%, #7c3aed 100%);
  color: #ffffff;
  padding: 10px 16px;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.us-urgency-banner__badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  font-weight: 800;
}

.us-urgency-banner__timer {
  font-family: monospace;
  background: rgba(0, 0, 0, 0.25);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.95rem;
  color: var(--us-gold);
}

.us-urgency-banner__btn {
  background: #ffffff;
  color: #4f46e5;
  border: none;
  padding: 6px 14px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  transition: transform 0.2s, background 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.us-urgency-banner__btn:hover {
  transform: translateY(-1px);
  background: #f8fafc;
}

/* ── Navigation ────────────────────────────────────────────────────────── */
.us-nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--us-border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.us-nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.us-nav__brand {
  font-family: var(--us-font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.5px;
  color: var(--us-text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.us-nav__brand span {
  color: var(--us-indigo);
}

.us-btn-primary {
  background: linear-gradient(135deg, var(--us-indigo) 0%, var(--us-violet) 100%);
  color: #ffffff;
  border: none;
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: 0 4px 15px var(--us-indigo-glow);
  transition: transform 0.2s, box-shadow 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

.us-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.us-btn-mega {
  width: 100%;
  padding: 18px 28px;
  font-size: 1.1rem;
  border-radius: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── Hero Section ──────────────────────────────────────────────────────── */
.us-hero {
  padding: 60px 0 80px;
  position: relative;
}

.us-hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.us-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  color: #4338ca;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.us-hero__headline {
  font-family: var(--us-font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
  color: var(--us-text-main);
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: var(--us-text-main);
}

.us-hero__headline em {
  font-style: normal;
  color: var(--us-indigo);
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: var(--us-indigo);
}

.us-hero__sub {
  font-size: 1.15rem;
  color: var(--us-text-sub);
  margin-bottom: 32px;
  max-width: 620px;
}

.us-hero__proof-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.us-proof-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid var(--us-border);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: #334155;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.us-proof-pill i {
  color: var(--us-emerald);
}

.us-hero__card {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-lg);
  padding: 32px;
  position: relative;
  box-shadow: 0 20px 48px rgba(15, 23, 42, 0.08);
}

.us-hero__card-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: #fef3c7;
  border: 1px solid #fde68a;
  color: #92400e;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 50px;
  text-transform: uppercase;
}

.us-price-tag {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.us-price-current {
  font-size: 3rem;
  font-weight: 900;
  color: var(--us-text-main);
  font-family: var(--us-font-heading);
}

.us-price-original {
  font-size: 1.4rem;
  color: var(--us-text-muted);
  text-decoration: line-through;
}

.us-price-savings {
  color: var(--us-emerald);
  font-weight: 700;
  font-size: 0.9rem;
}

/* ── Exam Badges Grid ──────────────────────────────────────────────────── */
.us-exams-section {
  padding: 40px 0;
  border-top: 1px solid var(--us-border);
  border-bottom: 1px solid var(--us-border);
  background: #f8fafc;
}

.us-exams__title {
  text-align: center;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--us-text-muted);
  margin-bottom: 24px;
  font-weight: 700;
}

.us-exams__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.us-exam-chip {
  background: #ffffff;
  border: 1px solid var(--us-border);
  color: #334155;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.us-exam-chip:hover {
  border-color: var(--us-indigo);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.12);
}

/* ── Problem & Agitation Section ───────────────────────────────────────── */
.us-section {
  padding: 90px 0;
}

.us-section-title {
  text-align: center;
  font-family: var(--us-font-heading);
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  color: var(--us-text-main);
}

.us-section-sub {
  text-align: center;
  font-size: 1.1rem;
  color: var(--us-text-sub);
  max-width: 700px;
  margin: 0 auto 56px;
}

.us-problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 20px;
}

.us-problem-card {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-md);
  padding: 32px;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.us-problem-card:hover {
  transform: translateY(-4px);
  border-color: rgba(239, 68, 68, 0.4);
  box-shadow: 0 10px 25px rgba(239, 68, 68, 0.08);
}

.us-problem-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #fef2f2;
  color: #ef4444;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.us-problem-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
  font-family: var(--us-font-heading);
  color: var(--us-text-main);
}

.us-problem-card p {
  color: var(--us-text-sub);
  font-size: 0.95rem;
}

/* ── Value Stack Section ───────────────────────────────────────────────── */
.us-value-stack {
  background: #faf9f6;
  padding: 90px 0;
  border-top: 1px solid var(--us-border);
  border-bottom: 1px solid var(--us-border);
}

.us-stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.us-stack-card {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-md);
  padding: 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.us-stack-card__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--us-indigo);
  margin-bottom: 12px;
}

.us-stack-card h4 {
  font-size: 1.2rem;
  font-family: var(--us-font-heading);
  margin-bottom: 8px;
  color: var(--us-text-main);
}

.us-stack-card p {
  color: var(--us-text-sub);
  font-size: 0.92rem;
  margin-bottom: 16px;
}

.us-stack-card__value {
  font-weight: 800;
  color: var(--us-gold);
  font-size: 1rem;
}

.us-total-value-banner {
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: var(--us-radius-lg);
  padding: 40px;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.06);
}

.us-total-value-banner h3 {
  font-size: 1.6rem;
  margin-bottom: 12px;
  color: var(--us-text-main);
}

.us-total-value-banner .strike {
  font-size: 2.2rem;
  color: var(--us-text-muted);
  text-decoration: line-through;
  margin-right: 12px;
}

.us-total-value-banner .now {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--us-emerald);
  font-family: var(--us-font-heading);
}

/* ── Testimonials Section ──────────────────────────────────────────────── */
.us-testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 20px;
}

.us-testimonial-card {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-md);
  padding: 28px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.04);
}

.us-testimonial-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.us-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--us-indigo), var(--us-violet));
  color: #ffffff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.us-user-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--us-text-main);
}

.us-user-role {
  font-size: 0.82rem;
  color: var(--us-text-sub);
}

.us-stars {
  color: var(--us-amber);
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.us-testimonial-card p {
  color: var(--us-text-sub);
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.6;
}

/* ── Guarantee & Risk Free ─────────────────────────────────────────────── */
.us-guarantee-card {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--us-radius-lg);
  padding: 48px;
  text-align: center;
  max-width: 850px;
  margin: 0 auto;
  box-shadow: 0 10px 30px rgba(5, 150, 105, 0.06);
}

.us-guarantee-icon {
  font-size: 3.5rem;
  color: var(--us-emerald);
  margin-bottom: 16px;
}

.us-guarantee-card h3 {
  font-size: 1.8rem;
  font-family: var(--us-font-heading);
  margin-bottom: 16px;
  color: #065f46;
}

.us-guarantee-card p {
  color: #047857;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* ── FAQ Accordion ─────────────────────────────────────────────────────── */
.us-faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.us-faq-item {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-md);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.us-faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--us-text-main);
  font-family: var(--us-font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.us-faq-answer {
  padding: 0 24px 20px;
  color: var(--us-text-sub);
  font-size: 0.95rem;
  line-height: 1.6;
  display: none;
}

.us-faq-item.open .us-faq-answer {
  display: block;
}

.us-faq-item.open {
  border-color: var(--us-indigo);
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.08);
}

/* ── Footer ────────────────────────────────────────────────────────────── */
.us-footer {
  padding: 40px 0;
  border-top: 1px solid var(--us-border);
  text-align: center;
  color: var(--us-text-muted);
  font-size: 0.85rem;
  background: #ffffff;
}

/* ── Checkout Modal Overlay ────────────────────────────────────────────── */
.us-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.us-modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.us-modal-card {
  background: var(--us-bg-card);
  border: 1px solid var(--us-border);
  border-radius: var(--us-radius-lg);
  width: 90%;
  max-width: 480px;
  padding: 36px;
  position: relative;
  box-shadow: 0 25px 60px rgba(15, 23, 42, 0.2);
}

.us-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: #f1f5f9;
  border: none;
  color: var(--us-text-muted);
  font-size: 1.3rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.us-modal-close:hover {
  background: #e2e8f0;
  color: var(--us-text-main);
}

.us-form-group {
  margin-bottom: 20px;
}

.us-form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--us-text-sub);
  margin-bottom: 6px;
}

.us-form-input {
  width: 100%;
  padding: 14px 16px;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  color: var(--us-text-main);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}

.us-form-input:focus {
  background: #ffffff;
  border-color: var(--us-indigo);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* ── Mobile Responsive Overrides ───────────────────────────────────────── */
@media (max-width: 899px) {
  .us-hero__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .us-hero__headline {
    font-size: 2.3rem;
  }
  .us-section-title {
    font-size: 1.8rem;
  }
  .us-urgency-banner {
    flex-wrap: wrap;
    font-size: 0.8rem;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   SWISS MODERNIST EDITORIAL OVERRIDES FOR US LANDING
   ═══════════════════════════════════════════════════════════════════════════ */

*, *::before, *::after {
  box-shadow: none !important;
  text-shadow: none !important;
}

body {
  background-color: #f9f9f9 !important;
  color: #0a0a0a !important;
  font-family: 'Inter', -apple-system, sans-serif !important;
}

/* ── Typography ── */
.us-hero__headline,
.us-section-title,
.us-problem-card h3,
.us-stack-card h4,
.us-modal-card h3 {
  font-family: 'Inter', sans-serif !important;
  letter-spacing: -0.035em !important;
  font-weight: 600 !important;
  color: #0a0a0a !important;
}

.us-hero__headline em {
  font-family: 'Inter', sans-serif !important;
  color: #595959 !important;
  -webkit-text-fill-color: #595959 !important;
}

.us-price-current,
.us-price-original,
.us-urgency-banner__timer {
  font-family: 'JetBrains Mono', monospace !important;
}

.us-hero__eyebrow,
.us-stack-card__tag,
.us-exams__title,
.us-urgency-banner__badge {
  font-family: 'Inter', sans-serif !important;
  font-size: 11px !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
}

/* ── Banner ── */
.us-urgency-banner {
  background: #0a0a0a !important;
  color: #ffffff !important;
  border-bottom: 1px solid #e5e5e5 !important;
}

.us-urgency-banner__badge {
  background: #262626 !important;
  color: #ffffff !important;
  border-radius: 9999px !important;
}

.us-urgency-banner__btn {
  background: #ffffff !important;
  color: #0a0a0a !important;
  border-radius: 9999px !important;
  border: 1px solid #ffffff !important;
}

.us-urgency-banner__btn:hover {
  background: #f3f3f4 !important;
  color: #000000 !important;
}

/* ── Cartesian Containers ── */
.us-hero__card,
.us-problem-card,
.us-stack-card,
.us-proof-pill,
.us-exam-chip,
.us-modal-card,
.us-exams-section,
.us-value-stack {
  border-radius: 0 !important;
  border: 1px solid #e5e5e5 !important;
  background: #ffffff !important;
  box-shadow: none !important;
}

.us-problem-icon {
  border-radius: 0 !important;
  background: #f3f3f4 !important;
  color: #0a0a0a !important;
}

/* ── Buttons ── */
.us-btn-primary,
.us-btn-mega {
  background: #0a0a0a !important;
  color: #ffffff !important;
  border: 1px solid #0a0a0a !important;
  border-radius: 9999px !important;
  box-shadow: none !important;
  font-family: 'Inter', sans-serif !important;
  font-weight: 600 !important;
  letter-spacing: -0.01em !important;
  transition: background 0.15s ease !important;
}

.us-btn-primary:hover,
.us-btn-mega:hover {
  background: #262626 !important;
  border-color: #262626 !important;
  color: #ffffff !important;
  transform: none !important;
  box-shadow: none !important;
}

/* ── Inputs & Modals ── */
.us-modal-overlay {
  background: rgba(10, 10, 10, 0.5) !important;
}

.us-modal-close {
  border-radius: 50% !important;
  border: 1px solid #e5e5e5 !important;
  background: #f3f3f4 !important;
  color: #0a0a0a !important;
}

.us-form-input {
  background: #ffffff !important;
  border: 1px solid #e5e5e5 !important;
  border-radius: 0 !important;
  color: #0a0a0a !important;
  font-family: 'Inter', sans-serif !important;
}

.us-form-input:focus {
  border-color: #0a0a0a !important;
  background: #ffffff !important;
  box-shadow: none !important;
  outline: none !important;
}

/* ══════════════════════════════════════════════════════════════════════════
   MOBILE RESPONSIVENESS OVERRIDES (US Checkout & Landing Page)
   ══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .us-container {
    width: 100% !important;
    padding: 0 16px !important;
    box-sizing: border-box !important;
  }
  .us-hero__grid {
    grid-template-columns: 1fr !important;
    gap: 24px !important;
  }
  .us-hero__headline {
    font-size: clamp(26px, 7vw, 36px) !important;
    line-height: 1.18 !important;
  }
  .us-section-title {
    font-size: clamp(22px, 5.5vw, 28px) !important;
    line-height: 1.25 !important;
  }
  .us-value-stack {
    padding: 48px 0 !important;
  }
  .us-urgency-banner {
    padding: 8px 12px !important;
    font-size: 0.78rem !important;
    gap: 6px !important;
    flex-wrap: wrap !important;
    justify-content: center !important;
  }
  .us-urgency-banner__btn {
    padding: 4px 10px !important;
    font-size: 0.75rem !important;
  }
  .us-hero__checkout-card {
    padding: 20px 16px !important;
  }
  .us-btn-mega,
  .us-btn-primary {
    width: 100% !important;
    max-width: 100% !important;
    justify-content: center !important;
    text-align: center !important;
    box-sizing: border-box !important;
  }
  .us-modal-card {
    width: calc(100% - 24px) !important;
    max-width: 100% !important;
    margin: 12px auto !important;
    padding: 20px 16px !important;
    max-height: calc(100vh - 24px) !important;
    overflow-y: auto !important;
  }
  .us-form-input,
  input,
  select,
  textarea {
    font-size: 16px !important;
  }
}

@media (max-width: 480px) {
  .us-container {
    padding: 0 12px !important;
  }
  .us-problem-card,
  .us-stack-card,
  .us-testimonial-card {
    padding: 20px 16px !important;
  }
  .us-proof-row {
    flex-direction: column !important;
    gap: 8px !important;
  }
  .us-proof-pill {
    width: 100% !important;
    justify-content: center !important;
    box-sizing: border-box !important;
  }
}