/* ===================================
   AI 學習指南 — 主樣式表
   =================================== */

/* ===== CSS Variables ===== */
:root {
  --primary: #6c63ff;
  --primary-dark: #5a52d5;
  --primary-light: #a099ff;
  --secondary: #ff6584;
  --accent: #43e97b;
  --gold: #ffd700;
  --dark: #0f0e1a;
  --dark-2: #1a1830;
  --dark-3: #252342;
  --text-primary: #1e1c3a;
  --text-secondary: #6b6b8a;
  --text-light: #9999bb;
  --bg-light: #f8f7ff;
  --bg-card: #ffffff;
  --border: #e8e6ff;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 12px rgba(108,99,255,0.08);
  --shadow-md: 0 8px 32px rgba(108,99,255,0.14);
  --shadow-lg: 0 20px 60px rgba(108,99,255,0.18);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Noto Sans TC', 'Inter', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  color: var(--text-primary);
  background: var(--bg-light);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul { list-style: none; }

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

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--dark-2); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }

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

/* ===== Gradient Text ===== */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: 0 6px 24px rgba(108,99,255,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(108,99,255,0.45);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.btn-gold {
  background: linear-gradient(135deg, #ffd700 0%, #ffaa00 100%);
  color: var(--dark);
  font-weight: 700;
  box-shadow: 0 6px 24px rgba(255,215,0,0.35);
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(255,215,0,0.5);
}

.btn-outline-white {
  background: transparent;
  color: var(--primary);
  border: 2px solid rgba(108,99,255,0.4);
}
.btn-outline-white:hover {
  background: rgba(108,99,255,0.08);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-large {
  padding: 18px 36px;
  font-size: 1.05rem;
}

/* ===================================
   NAVIGATION
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.0);
  backdrop-filter: blur(0px);
  transition: var(--transition);
  padding: 20px 0;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(20px);
  padding: 12px 0;
  box-shadow: 0 2px 24px rgba(108,99,255,0.1);
  border-bottom: 1px solid var(--border);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
  transition: var(--transition);
}

.navbar.scrolled .nav-logo {
  color: var(--text-primary);
}

.nav-logo i {
  font-size: 1.4rem;
  color: var(--primary-light);
}

.navbar.scrolled .nav-logo i {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  color: rgba(255,255,255,0.9);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 50px;
  transition: var(--transition);
}

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

.nav-links a:hover {
  color: white;
  background: rgba(255,255,255,0.15);
}

.navbar.scrolled .nav-links a:hover {
  color: var(--primary);
  background: rgba(108,99,255,0.08);
}

.nav-links .nav-cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white !important;
  padding: 10px 20px;
}
.nav-links .nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(108,99,255,0.4);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: var(--transition);
}

.navbar.scrolled .hamburger span {
  background: var(--text-primary);
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #f0eeff 0%, #fff 50%, #fdf4ff 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 100px 0 60px;
}

.hero-bg-shapes {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.18;
}

.shape-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary) 0%, transparent 70%);
  top: -150px;
  right: -100px;
  animation: float1 8s ease-in-out infinite;
}

.shape-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
  bottom: 0;
  left: -100px;
  animation: float2 10s ease-in-out infinite;
}

.shape-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #a855f7 0%, transparent 70%);
  top: 50%;
  left: 40%;
  animation: float3 12s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-30px, 20px) scale(1.05); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -30px); }
}
@keyframes float3 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-20px, 15px); }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--primary);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ===================================
   HERO TESTIMONIALS
   =================================== */
.hero-testimonials {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  position: relative;
}

.testimonial-stack {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  width: 100%;
  max-width: 540px;
  align-items: start;
}

/* Base card */
.testi-card {
  background: white;
  border-radius: 18px;
  padding: 18px 20px;
  box-shadow: 0 4px 24px rgba(108,99,255,0.10), 0 1px 4px rgba(0,0,0,0.05);
  border: 1px solid rgba(108,99,255,0.1);
  position: relative;
  transition: var(--transition);
  animation: cardFloat linear infinite;
}

.testi-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.15);
}

/* Staggered float animations */
/* 左列（卡片1、3）正常位置，右列（卡片2、4）向下偏移製造錯位感 */
.testi-card-1 { animation: cardFloat1 7s ease-in-out infinite; }
.testi-card-2 { animation: cardFloat2 9s ease-in-out infinite; margin-top: 32px; }
.testi-card-3 { animation: cardFloat1 8s ease-in-out infinite 1s; }
.testi-card-4 { animation: cardFloat2 10s ease-in-out infinite 0.5s; margin-top: 32px; }

@keyframes cardFloat1 {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}
@keyframes cardFloat2 {
  0%, 100% { transform: translateY(-4px); }
  50% { transform: translateY(4px); }
}

/* Platform badge */
.testi-platform {
  position: absolute;
  top: 14px;
  right: 16px;
  font-size: 1.05rem;
  opacity: 0.75;
}
.testi-twitter  { color: #000; }
.testi-instagram { color: #e1306c; }
.testi-reddit   { color: #ff4500; }
.testi-xhs      { color: #fe2c55; }

/* Header row */
.testi-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.testi-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: white;
  flex-shrink: 0;
}
.testi-avatar-a { background: linear-gradient(135deg, #6c63ff, #a855f7); }
.testi-avatar-b { background: linear-gradient(135deg, #e1306c, #f97316); }
.testi-avatar-c { background: linear-gradient(135deg, #ff4500, #fb923c); }
.testi-avatar-d { background: linear-gradient(135deg, #fe2c55, #ff9a8b); }

.testi-user {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 1;
}

.testi-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.testi-verified {
  color: #1d9bf0;
  font-size: 0.78rem;
}

.testi-handle {
  font-size: 0.75rem;
  color: var(--text-light);
}

.testi-follow {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  border: 1px solid var(--primary);
  padding: 3px 12px;
  border-radius: 20px;
  cursor: pointer;
  white-space: nowrap;
}

/* Text */
.testi-text {
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.65;
  margin-bottom: 10px;
}

.testi-highlight {
  background: linear-gradient(135deg, rgba(108,99,255,0.15), rgba(168,85,247,0.12));
  color: var(--primary);
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
}

/* Emoji image row (Instagram) */
.testi-img-row {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.testi-mini-img {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: #f0eeff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

/* Tags (Xiaohongshu) */
.testi-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.testi-tags span {
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 600;
}

/* Stats row */
.testi-stats {
  display: flex;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.testi-stats span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.testi-stats .fa-heart { color: #f43f5e; }
.testi-stats .fa-arrow-up { color: #ff4500; }
.testi-stats .fa-bookmark { color: #f59e0b; }

/* Result badge */
.testi-result-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(108,99,255,0.1), rgba(108,99,255,0.06));
  color: var(--primary);
  border: 1px solid rgba(108,99,255,0.2);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 700;
}

.testi-badge-green {
  background: rgba(34,197,94,0.08);
  color: #16a34a;
  border-color: rgba(34,197,94,0.25);
}

.testi-badge-orange {
  background: rgba(249,115,22,0.08);
  color: #ea580c;
  border-color: rgba(249,115,22,0.25);
}

.testi-badge-purple {
  background: rgba(168,85,247,0.08);
  color: #9333ea;
  border-color: rgba(168,85,247,0.25);
}

.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  font-size: 0.8rem;
  z-index: 2;
}

.bounce {
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(8px); }
}

/* ===================================
   ALERT BANNER
   =================================== */
.alert-banner {
  background: linear-gradient(135deg, #f0eeff 0%, #fdf4ff 100%);
  color: var(--text-primary);
  text-align: center;
  padding: 16px 24px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
}

.alert-banner i {
  color: var(--primary);
  font-size: 0.85rem;
}

.alert-banner a {
  color: var(--primary);
  font-weight: 700;
  border-bottom: 1px solid rgba(108,99,255,0.4);
  transition: var(--transition);
}

.alert-banner a:hover {
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

/* ===================================
   SECTION COMMON
   =================================== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(108,99,255,0.1);
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 16px;
  border: 1px solid rgba(108,99,255,0.2);
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===================================
   TOOLS SECTION
   =================================== */
.tools-section {
  background: #fafafe;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.tool-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(108,99,255,0.3);
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 0;
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: white;
  flex-shrink: 0;
}

.chatgpt-icon { background: linear-gradient(135deg, #10a37f 0%, #0d8a6b 100%); }
.notion-icon { background: linear-gradient(135deg, #333 0%, #000 100%); }
.perplexity-icon { background: linear-gradient(135deg, #1e8cf1 0%, #1468c7 100%); }
.gemini-icon { background: linear-gradient(135deg, #4285f4 0%, #34a853 60%, #fbbc05 100%); }
.anki-icon { background: linear-gradient(135deg, #0070cc 0%, #004d99 100%); }
.claude-icon { background: linear-gradient(135deg, #cc785c 0%, #a8613a 100%); }

.tool-meta { flex: 1; }
.tool-meta h3 { font-size: 1.05rem; font-weight: 700; color: var(--text-primary); }

.tool-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(108,99,255,0.08);
  padding: 2px 10px;
  border-radius: 20px;
  margin-top: 4px;
}

.tool-rating {
  color: #f59e0b;
  font-size: 0.75rem;
}

.tool-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  margin: 16px 0 0;
  display: block;
  opacity: 1 !important;
  background: #f0eeff;
}

.tool-body {
  padding: 16px 20px 20px;
}

.tool-body p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.tool-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.tool-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.tool-features li i {
  color: var(--accent);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.tool-use-case {
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg-light);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

/* ===================================
   TUTOR CTA MID
   =================================== */
.tutor-cta-mid {
  padding: 80px 0;
  background: white;
}

.tutor-mid-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.tutor-mid-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary), var(--gold));
}

.tutor-mid-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,215,0,0.15);
  border: 1px solid rgba(255,215,0,0.4);
  color: #b8860b;
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.tutor-mid-content h2 {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.tutor-mid-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.tutor-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
}

.tutor-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

.tutor-features li i {
  color: var(--primary);
  font-size: 0.85rem;
  background: rgba(108,99,255,0.1);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tutor-mid-image img {
  border-radius: var(--radius-lg);
  width: 100%;
  object-fit: cover;
  max-height: 360px;
  box-shadow: var(--shadow-md);
}

/* ===================================
   METHODS SECTION
   =================================== */
.methods-section {
  background: #fafafe;
}

.methods-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.method-card {
  background: white;
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 80px 1fr;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.method-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(108,99,255,0.25);
}

.method-number {
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  font-size: 1.6rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 20px 0;
  letter-spacing: 2px;
}

.method-content {
  padding: 32px;
}

.method-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}

.method-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.method-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 8px;
}

.method-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 20px;
  background: rgba(108,99,255,0.1);
  color: var(--primary);
  border: 1px solid rgba(108,99,255,0.2);
}

.method-body p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.steps-container {
  margin-bottom: 24px;
}

.steps-container h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.steps-container h4 i {
  color: var(--primary);
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--bg-light);
  padding: 14px;
  border-radius: var(--radius-sm);
}

.step-num {
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step p {
  font-size: 0.85rem;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.5;
}

.prompt-box {
  background: #f5f3ff;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(108,99,255,0.2);
}

.prompt-header {
  background: rgba(108,99,255,0.1);
  color: var(--primary);
  padding: 10px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(108,99,255,0.15);
}

.prompt-text {
  color: var(--text-primary);
  font-size: 0.88rem;
  line-height: 1.7;
  padding: 16px;
  font-family: 'Courier New', monospace;
  white-space: pre-wrap;
}

/* ===================================
   TIPS SECTION
   =================================== */
.tips-section {
  background: white;
}

.tip-card {
  background: #fafafe;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}

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

.tip-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(108,99,255,0.3);
  background: white;
}

.tip-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  margin: 0 auto 16px;
}

.tip-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.tip-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================
   TUTOR SECTION (main)
   =================================== */
.tutor-section {
  background: linear-gradient(135deg, #f5f3ff 0%, #fdf4ff 50%, #fff 100%);
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.tutor-section::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108,99,255,0.08) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  pointer-events: none;
}

.tutor-content {
  position: relative;
  z-index: 2;
}

.tutor-comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: start;
  margin-bottom: 60px;
}

.compare-plus {
  font-size: 3rem;
  font-weight: 900;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
}

.compare-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.compare-ai { border-color: rgba(108,99,255,0.25); }
.compare-tutor { border-color: rgba(255,170,0,0.35); }

.compare-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
  text-align: center;
}

.compare-ai .compare-icon { color: var(--primary); }
.compare-tutor .compare-icon { color: #f59e0b; }

.compare-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 20px;
}

.compare-card ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.compare-card li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.compare-card li i.fa-check { color: #22c55e; }
.compare-card li i.fa-times { color: #d1d5db; }
.compare-card li i.muted { color: #d1d5db !important; }

.tutor-cta-box {
  background: white;
  border: 1px solid rgba(108,99,255,0.2);
  border-radius: var(--radius-xl);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.tutor-logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.tutor-logo-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--gold) 0%, #ffaa00 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--dark);
}

.tutor-logo-area h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tutor-logo-area p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.tutor-desc {
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto 36px;
  font-size: 1rem;
}

.tutor-cta-buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: center;
  align-items: center;
  width: 100%;
  text-align: center;
}

.tutor-cta-buttons .btn {
  margin: 0 auto;
}

/* ===================================
   FAQ SECTION
   =================================== */
.faq-section {
  background: #fafafe;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item.active {
  border-color: rgba(108,99,255,0.3);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 22px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: var(--transition);
}

.faq-question:hover { color: var(--primary); }
.faq-question i {
  color: var(--primary);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.active .faq-question i { transform: rotate(180deg); }

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 24px;
}

.faq-answer p {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.92rem;
}

.faq-answer a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
  background: var(--text-primary);
  color: rgba(255,255,255,0.65);
  padding: 80px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
  margin-bottom: 16px;
}

.footer-logo i { color: var(--primary-light); font-size: 1.4rem; }

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
}

.footer-links h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links li a {
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-links li a:hover {
  color: white;
  padding-left: 4px;
}

.footer-tutor h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: white;
  margin-bottom: 16px;
}

.footer-tutor-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,215,0,0.1);
  border: 1px solid rgba(255,215,0,0.25);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 12px;
  transition: var(--transition);
}

.footer-tutor-card:hover {
  background: rgba(255,215,0,0.2);
  transform: translateY(-2px);
}

.footer-tutor-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--gold) 0%, #ffaa00 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--dark);
  flex-shrink: 0;
}

.footer-tutor-card strong {
  display: block;
  color: white;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.footer-tutor-card p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
}

.footer-tutor-card > i {
  margin-left: auto;
  color: rgba(255,215,0,0.6);
  flex-shrink: 0;
}

.footer-tutor-desc {
  font-size: 0.82rem;
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.83rem;
  color: rgba(255,255,255,0.35);
}

/* ===================================
   BACK TO TOP
   =================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 1024px) {
  .tools-grid { grid-template-columns: repeat(2, 1fr); }
  .tips-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-container { gap: 40px; }
}

@media (max-width: 900px) {
  .tutor-mid-card { grid-template-columns: 1fr; gap: 32px; padding: 40px; }
  .tutor-comparison { grid-template-columns: 1fr; }
  .compare-plus { padding: 0; font-size: 2rem; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: white;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 16px;
    z-index: 999;
  }

  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.2rem; padding: 12px 24px; color: var(--text-primary) !important; }

  .hamburger { display: flex; z-index: 1001; }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-title { font-size: 1.9rem; }

  .hero-buttons { justify-content: center; }
  .hero-stats { justify-content: center; }

  .hero-testimonials { display: none; }

  .testimonial-stack { grid-template-columns: 1fr; }
  .testi-card-2, .testi-card-4 { margin-top: 0; }

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

  .method-card {
    grid-template-columns: 1fr;
  }

  .method-number {
    writing-mode: horizontal-tb;
    padding: 12px 20px;
    font-size: 1.2rem;
    letter-spacing: 4px;
    text-align: center;
  }

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

  .section-title { font-size: 1.6rem; }

  .tutor-cta-buttons { flex-direction: column; align-items: center; }
  .tutor-cta-box { padding: 32px 24px; }
}

@media (max-width: 500px) {
  .tips-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .stat-divider { display: none; }
  .hero-buttons { flex-direction: column; align-items: center; }
}