/* ================================
   StarTalk 星语英语 — Design System
   ================================ */

/* ---------- CSS Variables ---------- */
:root {
  --clr-primary: #ffb347;
  --clr-primary-dark: #f5a030;
  --clr-primary-light: #ffd699;
  --clr-secondary: #4fc3f7;
  --clr-secondary-dark: #039be5;
  --clr-secondary-light: #b3e5fc;
  --clr-accent: #ff8a80;
  --clr-accent-dark: #ff5252;
  --clr-purple: #ce93d8;
  --clr-green: #81c784;
  --clr-bg: #fffdf7;
  --clr-white: #ffffff;
  --clr-text: #37474f;
  --clr-text-light: #78909c;
  --clr-text-muted: #b0bec5;
  --clr-border: #eceff1;

  --ff-en: "Fredoka", sans-serif;
  --ff-cn: "Noto Sans SC", sans-serif;

  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 40px;
  --radius-full: 50%;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 4px 30px rgba(255, 179, 71, 0.25);

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --bounce: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Reveal Animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-family: var(--ff-en);
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-primary-dark);
  background: var(--clr-primary-light);
  padding: 6px 20px;
  border-radius: 30px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 12px;
  line-height: 1.3;
}

.section-desc {
  font-size: 16px;
  color: var(--clr-text-light);
  max-width: 560px;
  margin: 0 auto;
}

/* ================================
   NAVBAR
   ================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 253, 247, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--clr-border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-en);
  font-size: 24px;
  font-weight: 700;
  color: var(--clr-text);
}

.logo-icon {
  font-size: 28px;
  animation: twinkle 2s ease-in-out infinite;
}

@keyframes twinkle {
  0%,
  100% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.1) rotate(10deg);
  }
}

.logo-highlight {
  color: var(--clr-primary-dark);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: var(--clr-text-light);
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--clr-primary);
  border-radius: 3px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--clr-text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-white);
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  padding: 10px 24px;
  border-radius: 30px;
  transition: var(--bounce);
  box-shadow: var(--shadow-glow);
}

.nav-cta:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 30px rgba(255, 179, 71, 0.4);
}

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

.nav-toggle span {
  width: 24px;
  height: 2.5px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ================================
   HERO
   ================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(170deg, #fff8e1 0%, #e1f5fe 50%, #fff3e0 100%);
  padding-top: 72px;
  overflow: hidden;
}

.hero-bg-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.floating-star {
  position: absolute;
  font-size: 32px;
  animation: float 6s ease-in-out infinite;
}

.star-1 {
  top: 15%;
  left: 10%;
  animation-delay: 0s;
}
.star-2 {
  top: 25%;
  right: 15%;
  animation-delay: 1.5s;
  font-size: 24px;
}
.star-3 {
  bottom: 30%;
  left: 5%;
  animation-delay: 3s;
  font-size: 20px;
}

.floating-bubble {
  position: absolute;
  border-radius: var(--radius-full);
  animation: float 8s ease-in-out infinite;
}

.bubble-1 {
  width: 80px;
  height: 80px;
  background: rgba(79, 195, 247, 0.1);
  top: 20%;
  right: 25%;
  animation-delay: 1s;
}

.bubble-2 {
  width: 50px;
  height: 50px;
  background: rgba(255, 138, 128, 0.1);
  top: 60%;
  left: 15%;
  animation-delay: 2.5s;
}

.bubble-3 {
  width: 120px;
  height: 120px;
  background: rgba(255, 179, 71, 0.08);
  bottom: 20%;
  right: 10%;
  animation-delay: 4s;
}

.floating-letter {
  position: absolute;
  font-family: var(--ff-en);
  font-weight: 700;
  font-size: 64px;
  opacity: 0.06;
  color: var(--clr-secondary-dark);
  animation: float 10s ease-in-out infinite;
}

.letter-1 {
  top: 10%;
  right: 30%;
  animation-delay: 0s;
}
.letter-2 {
  bottom: 25%;
  left: 20%;
  animation-delay: 2s;
  font-size: 80px;
}
.letter-3 {
  top: 40%;
  right: 5%;
  animation-delay: 4s;
  font-size: 48px;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-15px) rotate(3deg);
  }
  75% {
    transform: translateY(10px) rotate(-2deg);
  }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 60px;
  position: relative;
  z-index: 2;
}

.hero-content {
  flex: 1;
}

.hero-title {
  margin-bottom: 16px;
}

.hero-title-en {
  display: block;
  font-family: var(--ff-en);
  font-size: clamp(48px, 7vw, 72px);
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--clr-primary),
    var(--clr-accent),
    var(--clr-secondary)
  );
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 4s ease-in-out infinite;
  line-height: 1.1;
}

@keyframes gradientShift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.hero-title-cn {
  display: block;
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  color: var(--clr-text);
  margin-top: 4px;
}

.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 24px);
  color: var(--clr-primary-dark);
  font-weight: 600;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 16px;
  color: var(--clr-text-light);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--clr-white);
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  padding: 16px 40px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glow);
  transition: var(--bounce);
  animation: pulse 2s ease-in-out infinite;
}

.hero-cta:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 40px rgba(255, 179, 71, 0.45);
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: var(--shadow-glow);
  }
  50% {
    box-shadow: 0 4px 40px rgba(255, 179, 71, 0.4);
  }
}

/* Hero Illustration */
.hero-illustration {
  flex: 1;
  display: flex;
  justify-content: center;
}

.hero-scene {
  position: relative;
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle at center,
    rgba(255, 179, 71, 0.1) 0%,
    transparent 70%
  );
  border-radius: var(--radius-full);
}

.scene-child {
  position: absolute;
  font-size: 64px;
  animation: float 5s ease-in-out infinite;
}

.child-1 {
  bottom: 20%;
  left: 15%;
  animation-delay: 0s;
}
.child-2 {
  bottom: 25%;
  left: 45%;
  animation-delay: 0.5s;
  font-size: 72px;
}
.child-3 {
  bottom: 18%;
  right: 15%;
  animation-delay: 1s;
}

.scene-book {
  position: absolute;
  font-size: 48px;
  bottom: 10%;
  left: 50%;
  transform: translateX(-50%);
  animation: float 6s ease-in-out infinite;
  animation-delay: 2s;
}

.scene-globe {
  position: absolute;
  font-size: 56px;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  animation: spin-float 8s linear infinite;
}

@keyframes spin-float {
  0% {
    transform: translateX(-50%) translateY(0) rotate(0deg);
  }
  25% {
    transform: translateX(-50%) translateY(-10px) rotate(5deg);
  }
  50% {
    transform: translateX(-50%) translateY(0) rotate(0deg);
  }
  75% {
    transform: translateX(-50%) translateY(10px) rotate(-5deg);
  }
  100% {
    transform: translateX(-50%) translateY(0) rotate(0deg);
  }
}

.speech-bubble {
  position: absolute;
  font-family: var(--ff-en);
  font-weight: 600;
  font-size: 16px;
  color: var(--clr-white);
  padding: 8px 16px;
  border-radius: 20px 20px 20px 4px;
  animation:
    pop-in 0.4s ease-out forwards,
    float 4s ease-in-out infinite;
  opacity: 0;
}

.sb-1 {
  background: var(--clr-secondary);
  top: 30%;
  left: 5%;
  animation-delay: 0.5s, 0.5s;
}

.sb-2 {
  background: var(--clr-primary);
  top: 25%;
  right: 10%;
  border-radius: 20px 20px 4px 20px;
  animation-delay: 1s, 1s;
}

.sb-3 {
  background: var(--clr-accent);
  top: 45%;
  right: 5%;
  animation-delay: 1.5s, 1.5s;
}

@keyframes pop-in {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  z-index: 3;
}

.hero-wave svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ================================
   FEATURES
   ================================ */
.features {
  padding: 100px 0;
  background: var(--clr-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  border-radius: var(--radius-lg);
  background: var(--clr-bg);
  border: 2px solid transparent;
  transition: var(--bounce);
  cursor: default;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--clr-primary-light);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon {
  animation-delay: 0.5s;
}
.feature-card:nth-child(3) .feature-icon {
  animation-delay: 1s;
}
.feature-card:nth-child(4) .feature-icon {
  animation-delay: 1.5s;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--clr-text);
}

.feature-desc {
  font-size: 14px;
  color: var(--clr-text-light);
  line-height: 1.7;
}

/* ================================
   COURSES
   ================================ */
.courses {
  padding: 100px 0;
  background: linear-gradient(
    180deg,
    var(--clr-bg) 0%,
    #e8f5e9 50%,
    var(--clr-bg) 100%
  );
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: start;
}

.course-card {
  position: relative;
  background: var(--clr-white);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-md);
  transition: var(--bounce);
  overflow: hidden;
}

.course-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.course-card:nth-child(1)::before {
  background: var(--clr-secondary);
}
.course-card:nth-child(2)::before {
  background: var(--clr-primary);
}
.course-card:nth-child(3)::before {
  background: var(--clr-accent);
}

.course-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.course-card-featured {
  border: 2px solid var(--clr-primary-light);
  transform: scale(1.03);
}

.course-card-featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.course-popular {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--clr-accent-dark);
  background: #fff3e0;
  padding: 4px 12px;
  border-radius: 20px;
}

.course-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.badge-starter {
  background: var(--clr-secondary-light);
  color: var(--clr-secondary-dark);
}

.badge-growth {
  background: var(--clr-primary-light);
  color: var(--clr-primary-dark);
}

.badge-advanced {
  background: #ffcdd2;
  color: var(--clr-accent-dark);
}

.course-age {
  font-family: var(--ff-en);
  font-size: 28px;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 4px;
}

.course-name {
  font-family: var(--ff-en);
  font-size: 18px;
  font-weight: 600;
  color: var(--clr-text-light);
  margin-bottom: 20px;
}

.course-details {
  margin-bottom: 20px;
}

.course-details li {
  font-size: 14px;
  color: var(--clr-text);
  padding: 6px 0;
  border-bottom: 1px solid var(--clr-border);
  line-height: 1.6;
}

.course-details li:last-child {
  border-bottom: none;
}

.course-highlight {
  font-size: 13px;
  font-weight: 600;
  color: var(--clr-green);
  background: #e8f5e9;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  text-align: center;
}

/* ================================
   TEACHERS
   ================================ */
.teachers {
  padding: 100px 0;
  background: var(--clr-white);
}

.teachers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.teacher-card {
  text-align: center;
  padding: 36px 20px;
  border-radius: var(--radius-lg);
  background: var(--clr-bg);
  transition: var(--bounce);
}

.teacher-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.teacher-avatar {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-full);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  border: 4px solid var(--clr-white);
  box-shadow: var(--shadow-md);
}

.avatar-1 {
  background: linear-gradient(135deg, #ffe0b2, #ffcc80);
}
.avatar-2 {
  background: linear-gradient(135deg, #b3e5fc, #81d4fa);
}
.avatar-3 {
  background: linear-gradient(135deg, #f8bbd0, #f48fb1);
}
.avatar-4 {
  background: linear-gradient(135deg, #c8e6c9, #a5d6a7);
}

.teacher-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 6px;
}

.teacher-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--clr-secondary-dark);
  background: var(--clr-secondary-light);
  padding: 3px 12px;
  border-radius: 20px;
  margin-bottom: 10px;
}

.teacher-cert {
  font-size: 12px;
  color: var(--clr-text-muted);
  margin-bottom: 12px;
}

.teacher-desc {
  font-size: 13px;
  color: var(--clr-text-light);
  line-height: 1.7;
}

/* ================================
   ENVIRONMENT
   ================================ */
.environment {
  padding: 100px 0;
  background: linear-gradient(
    180deg,
    var(--clr-bg) 0%,
    #e3f2fd 50%,
    var(--clr-bg) 100%
  );
}

.env-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: auto auto;
  gap: 20px;
}

.env-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--bounce);
  cursor: default;
}

.env-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.env-card-large {
  grid-column: span 2;
  grid-row: span 2;
}

.env-visual {
  position: relative;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.env-card-large .env-visual {
  height: 100%;
  min-height: 420px;
}

.env-visual-1 {
  background: linear-gradient(135deg, #fff9c4, #ffe082, #ffd54f);
}

.env-visual-2 {
  background: linear-gradient(135deg, #b3e5fc, #81d4fa, #4fc3f7);
}

.env-visual-3 {
  background: linear-gradient(135deg, #f8bbd0, #f48fb1, #ec407a);
}

.env-visual-4 {
  background: linear-gradient(135deg, #c8e6c9, #a5d6a7, #66bb6a);
}

.env-emoji {
  font-size: 72px;
  position: relative;
  z-index: 2;
  animation: float 4s ease-in-out infinite;
}

.env-card-large .env-emoji {
  font-size: 96px;
}

.env-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.1;
  background-image: radial-gradient(circle, #fff 1.5px, transparent 1.5px);
  background-size: 20px 20px;
}

.env-label {
  padding: 16px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  background: var(--clr-white);
  color: var(--clr-text);
}

/* ================================
   REVIEWS
   ================================ */
.reviews {
  padding: 100px 0;
  background: var(--clr-white);
}

.reviews-carousel {
  position: relative;
  overflow: hidden;
  max-width: 700px;
  margin: 0 auto;
}

.reviews-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.review-card {
  min-width: 100%;
  padding: 40px;
  background: var(--clr-bg);
  border-radius: var(--radius-lg);
  text-align: center;
}

.review-stars {
  font-size: 20px;
  margin-bottom: 20px;
  letter-spacing: 4px;
}

.review-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--clr-text);
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.ra-1 {
  background: linear-gradient(135deg, #ffe0b2, #ffcc80);
}
.ra-2 {
  background: linear-gradient(135deg, #b3e5fc, #81d4fa);
}
.ra-3 {
  background: linear-gradient(135deg, #f8bbd0, #f48fb1);
}

.review-info {
  text-align: left;
}

.review-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--clr-text);
}

.review-child {
  font-size: 13px;
  color: var(--clr-text-muted);
}

.reviews-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--clr-border);
  cursor: pointer;
  transition: var(--transition);
}

.dot.active {
  background: var(--clr-primary);
  width: 28px;
  border-radius: 5px;
}

/* ================================
   TRIAL FORM
   ================================ */
.trial {
  padding: 100px 0;
  background: linear-gradient(180deg, var(--clr-bg) 0%, #fff3e0 100%);
}

.trial-wrapper {
  display: flex;
  gap: 60px;
  align-items: center;
  background: var(--clr-white);
  border-radius: var(--radius-xl);
  padding: 60px;
  box-shadow: var(--shadow-lg);
}

.trial-info {
  flex: 1;
}

.trial-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  color: var(--clr-text);
  margin: 12px 0;
}

.trial-desc {
  font-size: 15px;
  color: var(--clr-text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

.trial-benefits {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.trial-benefit {
  font-size: 14px;
  color: var(--clr-text);
  font-weight: 500;
}

.trial-form {
  flex: 1;
  max-width: 400px;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 14px 18px;
  font-size: 15px;
  font-family: var(--ff-cn);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background: var(--clr-bg);
  color: var(--clr-text);
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 4px rgba(255, 179, 71, 0.15);
}

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

.form-submit {
  width: 100%;
  padding: 16px;
  font-size: 17px;
  font-weight: 700;
  font-family: var(--ff-cn);
  color: var(--clr-white);
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--bounce);
  box-shadow: var(--shadow-glow);
}

.form-submit:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 30px rgba(255, 179, 71, 0.4);
}

.form-submit:active {
  transform: translateY(0) scale(0.98);
}

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

/* ================================
   FOOTER
   ================================ */
.footer {
  background: #263238;
  color: #cfd8dc;
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-en);
  font-size: 24px;
  font-weight: 700;
  color: var(--clr-white);
  margin-bottom: 8px;
}

.footer-logo .logo-highlight {
  color: var(--clr-primary);
}

.footer-slogan {
  font-size: 14px;
  color: #90a4ae;
  margin-bottom: 16px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--clr-primary);
  transform: translateY(-2px);
}

.footer-links h4,
.footer-contact h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--clr-white);
  margin-bottom: 16px;
}

.footer-links li,
.footer-contact li {
  font-size: 14px;
  padding: 4px 0;
  color: #90a4ae;
}

.footer-links a {
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: #607d8b;
}

/* ================================
   RESPONSIVE
   ================================ */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .env-card-large {
    grid-column: span 2;
    grid-row: span 1;
  }

  .env-card-large .env-visual {
    min-height: 240px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--clr-white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--clr-border);
  }

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

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-container {
    flex-direction: column;
    text-align: center;
    padding-top: 40px;
    padding-bottom: 80px;
  }

  .hero-illustration {
    display: none;
  }

  .hero-cta {
    margin: 0 auto;
  }

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

  .course-card-featured {
    transform: none;
  }

  .course-card-featured:hover {
    transform: translateY(-6px);
  }

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

  .teachers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

  .env-card-large {
    grid-column: span 2;
  }

  .trial-wrapper {
    flex-direction: column;
    padding: 32px 24px;
    gap: 32px;
  }

  .trial-benefits {
    grid-template-columns: 1fr;
  }

  .trial-form {
    max-width: 100%;
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .review-card {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  .teachers-grid {
    grid-template-columns: 1fr;
  }

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

  .env-card-large {
    grid-column: span 1;
  }
}