/* ==========================================================================
   21+ LOYIHA — Design System & Styles
   Production-quality CSS — Mobile-first, Custom Properties, Semantic
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS CUSTOM PROPERTIES
   -------------------------------------------------------------------------- */
:root {
  /* Brand Colors */
  --navy-900: #0a1628;
  --navy-800: #0d1b2a;
  --navy-700: #1b3a5c;
  --navy-600: #234e78;
  --blue-500: #2b6cb0;
  --blue-400: #4299e1;
  --blue-100: #e8f0fe;
  --orange-600: #d14e08;
  --orange-500: #e8590c;
  --orange-400: #f0721c;
  --white: #ffffff;
  --gray-50: #f8f9fb;
  --gray-100: #f1f3f5;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-500: #64748b;
  --gray-600: #4a5568;
  --gray-700: #334155;
  --gray-900: #1a1a2e;

  /* Semantic Tokens */
  --color-bg: var(--white);
  --color-bg-alt: var(--gray-50);
  --color-bg-dark: var(--navy-800);
  --color-bg-cta: var(--navy-900);
  --color-text: var(--gray-900);
  --color-text-secondary: var(--gray-600);
  --color-text-muted: var(--gray-500);
  --color-text-inverse: var(--white);
  --color-accent: var(--orange-500);
  --color-accent-hover: var(--orange-600);
  --color-border: var(--gray-200);
  --color-link: var(--blue-500);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --fs-display: clamp(2.25rem, 1.5rem + 3.2vw, 4rem);
  --fs-h1: clamp(1.875rem, 1.25rem + 2.5vw, 3rem);
  --fs-h2: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  --fs-h3: clamp(1.125rem, 0.9rem + 0.8vw, 1.5rem);
  --fs-h4: 1.125rem;
  --fs-body: clamp(0.9375rem, 0.875rem + 0.25vw, 1.0625rem);
  --fs-small: 0.875rem;
  --fs-xs: 0.8125rem;
  --fs-caption: 0.6875rem;
  --lh-tight: 1.1;
  --lh-snug: 1.2;
  --lh-normal: 1.5;
  --lh-relaxed: 1.7;

  /* Spacing */
  --sp-2: 0.125rem;
  --sp-4: 0.25rem;
  --sp-6: 0.375rem;
  --sp-8: 0.5rem;
  --sp-10: 0.625rem;
  --sp-12: 0.75rem;
  --sp-16: 1rem;
  --sp-20: 1.25rem;
  --sp-24: 1.5rem;
  --sp-32: 2rem;
  --sp-40: 2.5rem;
  --sp-48: 3rem;
  --sp-56: 3.5rem;
  --sp-64: 4rem;
  --sp-80: 5rem;
  --sp-96: 6rem;
  --sp-120: 7.5rem;

  /* Layout */
  --container-max: 1200px;
  --container-pad: var(--sp-20);
  --section-pad: var(--sp-64);
  --header-h: 64px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 150ms;
  --dur-base: 300ms;
  --dur-slow: 500ms;
}

@media (min-width: 768px) {
  :root {
    --container-pad: var(--sp-40);
    --header-h: 72px;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-pad: var(--sp-48);
    --section-pad: var(--sp-96);
  }
}

@media (min-width: 1280px) {
  :root {
    --container-pad: var(--sp-64);
    --section-pad: var(--sp-120);
  }
}

/* --------------------------------------------------------------------------
   2. RESET & BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

img, picture, video, svg { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; transition: color var(--dur-fast) var(--ease); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
   3. ACCESSIBILITY
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-16);
  background: var(--navy-800);
  color: var(--white);
  padding: var(--sp-8) var(--sp-16);
  border-radius: var(--radius-md);
  font-size: var(--fs-small);
  font-weight: 600;
  z-index: 200;
  transition: top var(--dur-base) var(--ease);
}
.skip-link:focus { top: var(--sp-16); }

:focus-visible {
  outline: 2px solid var(--blue-500);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   4. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--section-pad);
}
.section-light { background: var(--gray-50); }
.section-white { background: var(--white); }
.section-dark {
  background: var(--navy-800);
  color: var(--white);
}
.section-dark h2, .section-dark h3, .section-dark h4, .section-dark strong {
  color: var(--white);
}
.section-cta {
  background: var(--navy-900);
  color: var(--white);
  padding-block: var(--sp-96) var(--sp-80);
}

/* Section Header */
.section-header {
  max-width: 640px;
  margin-bottom: var(--sp-48);
}
.section-header.section-header-center {
  margin-inline: auto;
  text-align: center;
}
.section-label {
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--orange-500);
  margin-bottom: var(--sp-12);
}
.section-label-light { color: var(--orange-400); }
.section-title {
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: var(--lh-snug);
  color: var(--color-text);
}
.section-title-light { color: var(--white); }
.section-subtitle {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin-top: var(--sp-16);
  max-width: 560px;
  line-height: var(--lh-relaxed);
}

/* --------------------------------------------------------------------------
   5. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-8);
  font-weight: 600;
  font-size: var(--fs-small);
  line-height: 1;
  padding: var(--sp-12) var(--sp-24);
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--orange-500);
  color: var(--white);
  border-color: var(--orange-500);
}
.btn-primary:hover {
  background: var(--orange-600);
  border-color: var(--orange-600);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--gray-300);
}
.btn-secondary:hover {
  background: var(--gray-50);
  border-color: var(--gray-500);
}

.section-dark .btn-secondary,
.section-cta .btn-secondary,
.hero .btn-secondary {
  color: var(--white);
  border-color: rgba(255,255,255,0.3);
}
.section-dark .btn-secondary:hover,
.hero .btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.5);
}

.btn-sm { padding: var(--sp-8) var(--sp-16); font-size: var(--fs-xs); }
.btn-lg { padding: var(--sp-16) var(--sp-32); font-size: var(--fs-body); }
.btn-full { width: 100%; }

/* --------------------------------------------------------------------------
   6. HEADER / NAVIGATION
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease),
              box-shadow var(--dur-base) var(--ease);
}
.site-header.scrolled {
  border-color: var(--gray-200);
  box-shadow: var(--shadow-xs);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: baseline;
  gap: var(--sp-6);
  text-decoration: none;
}
.logo-mark {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--navy-800);
  letter-spacing: -0.02em;
}
.logo-text {
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--gray-500);
  text-transform: uppercase;
}

/* Nav Links */
.main-nav { display: none; }
@media (min-width: 1024px) {
  .main-nav { display: block; }
}
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--sp-32);
}
.nav-link {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--gray-600);
  padding: var(--sp-4) 0;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--orange-500);
  transition: width var(--dur-base) var(--ease);
}
.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }
.nav-link.active { color: var(--color-text); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: var(--sp-12); }
.header-cta { display: none; }
@media (min-width: 768px) { .header-cta { display: inline-flex; } }

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
@media (min-width: 1024px) { .mobile-nav-toggle { display: none; } }

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 22px;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--navy-800);
  border-radius: 1px;
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-fast) var(--ease);
  transform-origin: center;
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-nav-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
  opacity: 0;
}
.mobile-nav-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav Panel */
@media (max-width: 1023px) {
  .main-nav {
    display: block;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    z-index: 99;
    padding: var(--sp-32) var(--container-pad);
    transform: translateX(100%);
    transition: transform var(--dur-base) var(--ease);
  }
  .main-nav.open { transform: translateX(0); }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }
  .nav-link {
    display: block;
    font-size: 1.125rem;
    padding: var(--sp-16) 0;
    border-bottom: 1px solid var(--gray-100);
    width: 100%;
  }
  .nav-link::after { display: none; }
}

/* --------------------------------------------------------------------------
   7. HERO
   -------------------------------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--navy-800) 0%, var(--navy-700) 50%, var(--navy-600) 100%);
  color: var(--white);
  padding-top: var(--sp-48);
  padding-bottom: var(--sp-64);
  overflow: hidden;
}
@media (min-width: 1024px) {
  .hero {
    padding-top: var(--sp-64);
    padding-bottom: var(--sp-96);
  }
}

.hero-inner {
  display: grid;
  gap: var(--sp-48);
  align-items: center;
}
@media (min-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr 0.85fr;
    gap: var(--sp-64);
  }
}

.hero-content { display: flex; flex-direction: column; gap: var(--sp-24); }

.hero-badge {
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.5);
}

.hero-title { display: flex; flex-direction: column; gap: var(--sp-8); }
.hero-title-main {
  font-size: var(--fs-display);
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
}
.hero-title-sub {
  font-size: var(--fs-h3);
  font-weight: 400;
  color: rgba(255,255,255,0.7);
  line-height: var(--lh-normal);
}

.hero-description {
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: rgba(255,255,255,0.65);
  max-width: 480px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-12); }

.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--sp-24);
  margin-top: var(--sp-8);
  padding-top: var(--sp-24);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat { display: flex; align-items: baseline; gap: var(--sp-6); }
.hero-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}
.hero-stat-label {
  font-size: var(--fs-small);
  color: rgba(255,255,255,0.5);
}
.hero-stat-divider {
  width: 1px;
  height: 24px;
  background: rgba(255,255,255,0.15);
}

/* Hero Image */
.hero-image {
  display: flex;
  justify-content: center;
}
.hero-image-frame {
  position: relative;
  max-width: 420px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.hero-image-frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
@media (max-width: 1023px) {
  .hero-image-frame { max-width: 320px; }
  .hero-image { order: -1; }
}

/* --------------------------------------------------------------------------
   8. PROBLEM SECTION
   -------------------------------------------------------------------------- */
.problem-grid {
  display: grid;
  gap: var(--sp-24);
}
@media (min-width: 768px) {
  .problem-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .problem-grid { grid-template-columns: repeat(3, 1fr); gap: var(--sp-32); }
}

.problem-card {
  padding: var(--sp-32);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  transition: border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}
.section-light .problem-card { background: var(--white); }
.problem-card:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow-sm);
}
.problem-card-number {
  font-size: var(--fs-caption);
  font-weight: 700;
  color: var(--orange-500);
  letter-spacing: 0.04em;
  margin-bottom: var(--sp-16);
}
.problem-card-title {
  font-size: var(--fs-h4);
  font-weight: 600;
  line-height: var(--lh-snug);
  margin-bottom: var(--sp-8);
}
.problem-card-text {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

/* --------------------------------------------------------------------------
   9. METHOD SECTION
   -------------------------------------------------------------------------- */
.method-steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-40);
  max-width: 720px;
}
.method-step {
  display: flex;
  gap: var(--sp-24);
  align-items: flex-start;
}
.method-step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--blue-100);
  color: var(--blue-500);
  font-size: 1.25rem;
  font-weight: 700;
}
.method-step-content { flex: 1; }
.method-step-title {
  font-size: var(--fs-h3);
  font-weight: 600;
  margin-bottom: var(--sp-8);
}
.method-step-text {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  max-width: 520px;
}
.method-note {
  margin-top: var(--sp-40);
  padding: var(--sp-20) var(--sp-24);
  border-left: 3px solid var(--orange-500);
  background: var(--gray-50);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.method-note p {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   10. CURRICULUM / ACCORDION
   -------------------------------------------------------------------------- */
.curriculum-accordion {
  display: flex;
  flex-direction: column;
}

.accordion-item {
  border-bottom: 1px solid var(--gray-200);
}
.accordion-item:first-child { border-top: 1px solid var(--gray-200); }

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-20) 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: var(--sp-16);
  color: var(--color-text);
}
.accordion-trigger:hover { color: var(--navy-700); }

.accordion-trigger-content {
  display: flex;
  align-items: center;
  gap: var(--sp-16);
  flex: 1;
  min-width: 0;
}

.accordion-number {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--orange-500);
  flex-shrink: 0;
  width: 28px;
}

.accordion-title-group { min-width: 0; }
.accordion-title {
  font-size: var(--fs-h4);
  font-weight: 600;
  line-height: var(--lh-snug);
}
.accordion-subtitle {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  margin-top: var(--sp-2);
  line-height: var(--lh-normal);
}

.accordion-chevron {
  flex-shrink: 0;
  transition: transform var(--dur-base) var(--ease);
  color: var(--gray-500);
}
.accordion-trigger[aria-expanded="true"] .accordion-chevron {
  transform: rotate(180deg);
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-slow) var(--ease);
}
.accordion-panel-content {
  padding-bottom: var(--sp-24);
  padding-left: 44px;
}

.curriculum-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-10);
}
.curriculum-list li {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  padding-left: var(--sp-16);
  position: relative;
}
.curriculum-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--orange-500);
}

/* FAQ Accordion */
.faq-container { max-width: 720px; }
.faq-accordion .accordion-trigger { padding: var(--sp-24) 0; }
.accordion-question {
  font-size: var(--fs-body);
  font-weight: 600;
}
.faq-accordion .accordion-panel-content {
  padding-left: 0;
  padding-bottom: var(--sp-24);
}
.faq-accordion .accordion-panel-content p {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

/* Curriculum Extra */
.curriculum-extra {
  display: grid;
  gap: var(--sp-20);
  margin-top: var(--sp-48);
  padding: var(--sp-32);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
}
@media (min-width: 768px) {
  .curriculum-extra { grid-template-columns: 1fr 1fr; }
}
.curriculum-extra-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-16);
}
.curriculum-extra-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-100);
  border-radius: var(--radius-md);
  color: var(--blue-500);
}
.curriculum-extra-item strong {
  display: block;
  font-size: var(--fs-body);
  margin-bottom: var(--sp-4);
}
.curriculum-extra-item p {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   11. FEATURES GRID (WHY 21+)
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  gap: var(--sp-24);
}
@media (min-width: 768px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .features-grid { grid-template-columns: repeat(3, 1fr); } }

.feature-card {
  padding: var(--sp-32);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: border-color var(--dur-base) var(--ease);
}
.feature-card:hover { border-color: var(--gray-300); }
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--sp-20);
  color: var(--blue-500);
}
.feature-title {
  font-size: var(--fs-h4);
  font-weight: 600;
  margin-bottom: var(--sp-8);
}
.feature-text {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

/* --------------------------------------------------------------------------
   12. TEACHER SECTION
   -------------------------------------------------------------------------- */
.teacher-grid-dual {
  display: grid;
  gap: var(--sp-32);
}
@media (min-width: 768px) {
  .teacher-grid-dual {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-40);
  }
}

.teacher-card-home {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.teacher-card-home-image {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  object-position: center top;
}

.teacher-card-home-body {
  padding: var(--sp-24);
  display: flex;
  flex-direction: column;
  gap: var(--sp-12);
  flex: 1;
}

.teacher-card-home-role {
  font-size: var(--fs-caption);
  font-weight: 600;
  color: var(--orange-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.teacher-card-home-name {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--white);
}

.teacher-card-home-bio {
  font-size: var(--fs-small);
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--lh-relaxed);
}
.teacher-brand {
  display: flex;
  align-items: baseline;
  gap: var(--sp-8);
  margin-top: var(--sp-8);
}
.teacher-brand-logo {
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.5);
}
.teacher-brand-sub {
  font-size: var(--fs-xs);
  color: rgba(255,255,255,0.3);
}

/* --------------------------------------------------------------------------
   13. SCHEDULE / EXPERIENCE
   -------------------------------------------------------------------------- */
.schedule-timeline {
  max-width: 680px;
  display: flex;
  flex-direction: column;
  position: relative;
}
.schedule-timeline::before {
  content: '';
  position: absolute;
  left: 36px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--gray-200);
}
@media (max-width: 767px) {
  .schedule-timeline::before { left: 28px; }
}

.schedule-item {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: var(--sp-16);
  padding: var(--sp-20) 0;
  position: relative;
  align-items: start;
}
@media (max-width: 767px) {
  .schedule-item { grid-template-columns: 56px 1fr; }
  .schedule-duration { display: none; }
}
.schedule-item::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 28px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue-500);
  border: 3px solid var(--white);
  z-index: 1;
}
@media (max-width: 767px) {
  .schedule-item::before { left: 22px; }
}
.schedule-item-last::before { background: var(--orange-500); }

.schedule-time {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}
.schedule-title {
  font-size: var(--fs-body);
  font-weight: 600;
  margin-bottom: var(--sp-4);
}
.schedule-text {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}
.schedule-duration {
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  background: var(--gray-100);
  padding: var(--sp-4) var(--sp-12);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   14. PACKAGE
   -------------------------------------------------------------------------- */
.package-grid {
  display: grid;
  gap: var(--sp-16);
}
@media (min-width: 768px) {
  .package-grid { grid-template-columns: repeat(2, 1fr); gap: var(--sp-20); }
}
@media (min-width: 1024px) {
  .package-grid { grid-template-columns: repeat(3, 1fr); }
}

.package-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-16);
  padding: var(--sp-24);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
}
.package-check {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-100);
  border-radius: 50%;
  color: var(--blue-500);
}
.package-item strong {
  display: block;
  font-size: var(--fs-body);
  margin-bottom: var(--sp-4);
}
.package-item p {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   15. PRICING
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  gap: var(--sp-24);
  align-items: start;
}
@media (min-width: 768px) {
  .pricing-grid { grid-template-columns: repeat(3, 1fr); }
}

.pricing-card {
  display: flex;
  flex-direction: column;
  padding: var(--sp-32);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  position: relative;
}
.pricing-card-featured {
  border-color: var(--blue-500);
  box-shadow: var(--shadow-md);
}

.pricing-badge {
  position: absolute;
  top: calc(-1 * var(--sp-12));
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue-500);
  color: var(--white);
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--sp-4) var(--sp-16);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.pricing-card-header { margin-bottom: var(--sp-24); }
.pricing-name {
  font-size: var(--fs-h3);
  font-weight: 700;
}
.pricing-format {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  margin-top: var(--sp-4);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  gap: var(--sp-8);
  margin-bottom: var(--sp-24);
  padding-bottom: var(--sp-24);
  border-bottom: 1px solid var(--gray-200);
}
.pricing-amount {
  font-size: var(--fs-h2);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.pricing-amount-usd { color: var(--blue-500); }
.pricing-currency {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: var(--sp-12);
  flex: 1;
  margin-bottom: var(--sp-32);
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--sp-10);
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}
.pricing-features li svg { flex-shrink: 0; color: var(--blue-500); }

/* --------------------------------------------------------------------------
   16. FINAL CTA
   -------------------------------------------------------------------------- */
.cta-content {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-24);
}
.cta-title {
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: var(--lh-snug);
  color: var(--white);
}
.cta-subtitle {
  font-size: var(--fs-body);
  color: rgba(255,255,255,0.6);
  line-height: var(--lh-relaxed);
  max-width: 520px;
}
.cta-actions { margin-top: var(--sp-8); }

.cta-contacts {
  display: grid;
  gap: var(--sp-32);
  margin-top: var(--sp-40);
  padding-top: var(--sp-40);
  border-top: 1px solid rgba(255,255,255,0.1);
  width: 100%;
}
@media (min-width: 768px) {
  .cta-contacts { grid-template-columns: 1fr 1fr; }
}

.cta-contact {
  display: flex;
  flex-direction: column;
  gap: var(--sp-10);
}
.cta-contact-label {
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.4);
}
.cta-contact-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-8);
  font-size: var(--fs-body);
  color: rgba(255,255,255,0.8);
  transition: color var(--dur-fast) var(--ease);
}
.cta-contact-link:hover { color: var(--white); }

/* --------------------------------------------------------------------------
   17. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--navy-800);
  color: rgba(255,255,255,0.6);
  padding: var(--sp-64) 0 var(--sp-32);
}
.footer-inner {
  display: grid;
  gap: var(--sp-40);
}
@media (min-width: 768px) {
  .footer-inner { grid-template-columns: 1.5fr 1fr 1fr; }
}

.logo-footer .logo-mark { color: var(--white); }
.logo-footer .logo-text { color: rgba(255,255,255,0.4); }
.footer-tagline {
  font-size: var(--fs-small);
  color: rgba(255,255,255,0.4);
  margin-top: var(--sp-12);
  font-style: italic;
}
.footer-nav-title {
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--sp-16);
}
.footer-nav ul, .footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-10);
}
.footer-nav a, .footer-contact a {
  font-size: var(--fs-small);
  color: rgba(255,255,255,0.6);
  transition: color var(--dur-fast) var(--ease);
}
.footer-nav a:hover, .footer-contact a:hover { color: var(--white); }

.footer-bottom {
  margin-top: var(--sp-48);
  padding-top: var(--sp-24);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-bottom p {
  font-size: var(--fs-caption);
  color: rgba(255,255,255,0.3);
}

/* --------------------------------------------------------------------------
   18. SCROLL REVEAL ANIMATIONS
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }

/* Missing structural classes */
.footer-brand { display: flex; flex-direction: column; }
.schedule-layout { margin-inline: auto; }
.schedule-detail { flex: 1; min-width: 0; }

/* --------------------------------------------------------------------------
   19. SUBPAGE HERO & BREADCRUMBS
   -------------------------------------------------------------------------- */
.page-hero {
  background: linear-gradient(135deg, var(--navy-800) 0%, var(--navy-700) 50%, var(--navy-600) 100%);
  color: var(--white);
  padding-top: var(--sp-48);
  padding-bottom: var(--sp-48);
}
@media (min-width: 1024px) {
  .page-hero {
    padding-top: var(--sp-64);
    padding-bottom: var(--sp-64);
  }
}

.page-hero-inner {
  max-width: 800px;
}

.breadcrumbs {
  margin-bottom: var(--sp-16);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-8);
  font-size: var(--fs-small);
  color: rgba(255,255,255,0.6);
}
.breadcrumb-item a {
  color: rgba(255,255,255,0.7);
  transition: color var(--dur-fast) var(--ease);
}
.breadcrumb-item a:hover {
  color: var(--white);
}
.breadcrumb-item[aria-current="page"] {
  color: var(--orange-400);
  font-weight: 500;
}
.breadcrumb-separator {
  color: rgba(255,255,255,0.4);
}

.page-title {
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--white);
  margin-bottom: var(--sp-16);
  letter-spacing: -0.02em;
}
.page-subtitle {
  font-size: var(--fs-body);
  color: rgba(255,255,255,0.8);
  line-height: var(--lh-relaxed);
  max-width: 680px;
}

/* --------------------------------------------------------------------------
   20. REGISTRATION FORM & INPUTS
   -------------------------------------------------------------------------- */
.registration-container {
  display: grid;
  gap: var(--sp-48);
}
@media (min-width: 1024px) {
  .registration-container {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }
}

.form-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--sp-32);
  box-shadow: var(--shadow-sm);
}
@media (min-width: 768px) {
  .form-card {
    padding: var(--sp-40);
  }
}

.form-group {
  margin-bottom: var(--sp-24);
}
.form-label {
  display: block;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--sp-8);
}
.form-label .required {
  color: var(--orange-500);
  margin-left: var(--sp-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--sp-12) var(--sp-16);
  font-size: var(--fs-body);
  color: var(--color-text);
  background: var(--white);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.15);
}

.form-hint {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-top: var(--sp-6);
}

.form-radio-group {
  display: grid;
  gap: var(--sp-12);
  margin-top: var(--sp-8);
}
@media (min-width: 640px) {
  .form-radio-group {
    grid-template-columns: repeat(3, 1fr);
  }
}

.form-radio-card {
  position: relative;
  display: block;
  cursor: pointer;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  padding: var(--sp-16);
  background: var(--white);
  transition: border-color var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}
.form-radio-card:hover {
  border-color: var(--gray-500);
  background: var(--gray-50);
}
.form-radio-card input[type="radio"] {
  position: absolute;
  top: var(--sp-16);
  right: var(--sp-16);
  accent-color: var(--orange-500);
}
.form-radio-card:has(input[type="radio"]:checked) {
  border-color: var(--orange-500);
  background: rgba(232, 89, 12, 0.04);
}
.radio-card-title {
  font-size: var(--fs-body);
  font-weight: 600;
  display: block;
  margin-bottom: var(--sp-4);
}
.radio-card-price {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--navy-800);
  display: block;
}
.radio-card-desc {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  display: block;
  margin-top: var(--sp-4);
}

.form-security-note {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-top: var(--sp-16);
}

.form-status {
  padding: var(--sp-16);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-24);
  display: none;
}
.form-status.success {
  display: block;
  background: #ecfdf5;
  border: 1px solid #10b981;
  color: #065f46;
}

/* Sidebar Info Card */
.sidebar-info-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--sp-32);
}
.sidebar-info-title {
  font-size: var(--fs-h4);
  font-weight: 700;
  margin-bottom: var(--sp-16);
  color: var(--navy-800);
}
.sidebar-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-16);
  margin-bottom: var(--sp-24);
}
.sidebar-info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-12);
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}
.sidebar-info-item svg {
  flex-shrink: 0;
  color: var(--orange-500);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   21. COMPARISON TABLE & PRICING SUBPAGE
   -------------------------------------------------------------------------- */
.comparison-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: var(--sp-48);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
}

.comparison-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  text-align: left;
}
.comparison-table th,
.comparison-table td {
  padding: var(--sp-16) var(--sp-20);
  border-bottom: 1px solid var(--gray-200);
  font-size: var(--fs-small);
}
.comparison-table th {
  background: var(--gray-50);
  font-weight: 700;
  color: var(--navy-800);
}
.comparison-table tr:last-child td {
  border-bottom: none;
}
.comparison-table td:nth-child(2),
.comparison-table td:nth-child(3),
.comparison-table td:nth-child(4),
.comparison-table th:nth-child(2),
.comparison-table th:nth-child(3),
.comparison-table th:nth-child(4) {
  text-align: center;
}
.table-check {
  color: var(--blue-500);
  font-weight: 700;
}
.table-cross {
  color: var(--gray-300);
}

/* --------------------------------------------------------------------------
   22. CONTACT CARDS & LOCAL SEO
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  gap: var(--sp-24);
}
@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.contact-card {
  padding: var(--sp-32);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  display: flex;
  flex-direction: column;
  gap: var(--sp-16);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.contact-card:hover {
  border-color: var(--gray-300);
  box-shadow: var(--shadow-sm);
}
.contact-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--blue-100);
  color: var(--blue-500);
  display: flex;
  align-items: center;
  justify-content: center;
}
.contact-card-title {
  font-size: var(--fs-h4);
  font-weight: 600;
}
.contact-card-desc {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
}
.contact-card-action {
  margin-top: auto;
  padding-top: var(--sp-12);
}

/* --------------------------------------------------------------------------
   23. MENTOR CARDS (USTOZLAR PAGE)
   -------------------------------------------------------------------------- */
.mentors-grid {
  display: grid;
  gap: var(--sp-48);
}
@media (min-width: 1024px) {
  .mentors-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-48);
  }
}

.mentor-profile-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  background: var(--white);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.mentor-profile-photo {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  object-position: center top;
  background: var(--navy-800);
}
.mentor-profile-body {
  padding: var(--sp-32);
  display: flex;
  flex-direction: column;
  gap: var(--sp-16);
  flex: 1;
}
.mentor-profile-role {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--orange-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.mentor-profile-name {
  font-size: var(--fs-h3);
  font-weight: 700;
  color: var(--navy-800);
}
.mentor-profile-bio {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}
.mentor-profile-topics {
  margin-top: var(--sp-8);
  padding-top: var(--sp-16);
  border-top: 1px solid var(--gray-200);
}
.mentor-profile-topics-title {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: var(--sp-8);
}
.mentor-topics-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-6);
}
.mentor-topic-pill {
  font-size: var(--fs-xs);
  background: var(--gray-100);
  color: var(--gray-700);
  padding: var(--sp-4) var(--sp-10);
  border-radius: var(--radius-full);
}