/* XIVIX AI 마스터 클래스 - 스케일러블 UI
 * 화면 크기에 따라 자동 비례 확대 (16" ~ 70" TV)
 * 삼성폰 전체 지원 (One UI 7.0 기준)
 */

/* ========== 변수 ========== */
:root {
  --primary: #0A192F;
  --primary-light: #1B3A5C;
  --accent: #00B4D8;
  --accent-light: #48CAE4;
  --white: #ffffff;
  --gray-50: #f8f9fa;
  --gray-100: #f1f3f5;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-500: #adb5bd;
  --gray-700: #495057;
  --gray-900: #212529;
  --success: #10B981;
  --warning: #F59E0B;
  
  --session-1: #E74C3C;
  --session-2: #3498DB;
  --session-3: #9B59B6;
  --session-4: #F39C12;
  
  --shadow-sm: 0 0.1vw 0.3vw rgba(0,0,0,0.08);
  --shadow-md: 0 0.4vw 1.2vw rgba(0,0,0,0.1);
  --shadow-lg: 0 0.8vw 2.4vw rgba(0,0,0,0.12);
  
  --radius-sm: 0.4vw;
  --radius-md: 0.6vw;
  --radius-lg: 1vw;
  
  /* 기본 비율 (1920px 기준) */
  --base-font: clamp(14px, 1vw, 20px);
  --header-height: clamp(56px, 4vw, 80px);
}

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

html {
  scroll-behavior: smooth;
  font-size: var(--base-font);
}

body {
  font-family: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--gray-50);
  -webkit-font-smoothing: antialiased;
}

/* ========== Header ========== */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--primary);
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: 90vw;
  height: 100%;
  margin: 0 auto;
  padding: 0 2vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1vw;
}

.logo-icon {
  width: clamp(36px, 2.5vw, 56px);
  height: clamp(36px, 2.5vw, 56px);
  background: var(--accent);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: clamp(16px, 1.2vw, 28px);
}

.logo-text h1 {
  font-size: clamp(16px, 1.3vw, 28px);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

.logo-text p {
  font-size: clamp(11px, 0.8vw, 18px);
  color: var(--accent-light);
  margin-top: 0.2vw;
}

.main-nav a {
  color: var(--white);
  text-decoration: none;
  font-size: clamp(14px, 1vw, 22px);
  font-weight: 500;
  padding: 0.6vw 1.2vw;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.main-nav a:hover {
  background: rgba(255,255,255,0.1);
}

.mobile-menu-btn {
  display: none;
  width: clamp(36px, 2.5vw, 56px);
  height: clamp(36px, 2.5vw, 56px);
  background: transparent;
  border: none;
  color: var(--white);
  font-size: clamp(18px, 1.3vw, 28px);
  cursor: pointer;
}

/* ========== Hero Section ========== */
.hero-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: calc(var(--header-height) + 4vw) 3vw 4vw;
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-inner {
  max-width: 85vw;
  margin: 0 auto;
  text-align: center;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  font-size: clamp(12px, 0.9vw, 20px);
  font-weight: 600;
  padding: 0.5vw 1.5vw;
  border-radius: 2vw;
  margin-bottom: 1.5vw;
  letter-spacing: -0.01em;
}

.hero-title {
  font-size: clamp(32px, 3.5vw, 80px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 1vw;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: clamp(16px, 1.3vw, 32px);
  color: rgba(255,255,255,0.8);
  margin-bottom: 0.5vw;
}

.hero-highlight {
  font-size: clamp(20px, 1.8vw, 44px);
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 3vw;
}

.hero-sessions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2vw;
  max-width: 70vw;
  margin: 0 auto 3vw;
}

.hero-session-item {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md);
  padding: 1.5vw 1vw;
  backdrop-filter: blur(8px);
}

.session-num {
  font-size: clamp(14px, 1.1vw, 26px);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.3vw;
}

.session-label {
  font-size: clamp(12px, 0.9vw, 22px);
  color: rgba(255,255,255,0.7);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.8vw;
  background: var(--accent);
  color: var(--white);
  border: none;
  padding: 1.2vw 3vw;
  font-size: clamp(16px, 1.3vw, 32px);
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 0.3vw 1.2vw rgba(0,180,216,0.3);
}

.hero-cta:hover {
  background: var(--accent-light);
  transform: translateY(-0.2vw);
  box-shadow: 0 0.5vw 2vw rgba(0,180,216,0.4);
}

/* ========== Target Section ========== */
.target-section {
  background: var(--white);
  padding: 4vw 3vw;
}

.target-inner {
  max-width: 85vw;
  margin: 0 auto;
}

.target-title {
  font-size: clamp(18px, 1.5vw, 36px);
  font-weight: 700;
  color: var(--gray-900);
  text-align: center;
  margin-bottom: 2.5vw;
}

.target-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2vw 2.5vw;
}

.target-item {
  display: flex;
  align-items: center;
  gap: 1vw;
  font-size: clamp(14px, 1.1vw, 26px);
  color: var(--gray-700);
}

.target-item i {
  color: var(--success);
  font-size: clamp(12px, 1vw, 24px);
  flex-shrink: 0;
}

/* ========== Curriculum Section ========== */
.curriculum-section {
  background: var(--gray-100);
  padding: 5vw 3vw;
}

.curriculum-inner {
  max-width: 85vw;
  margin: 0 auto;
}

/* Course Header */
.course-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 3.5vw 3vw;
  text-align: center;
  margin-bottom: 2.5vw;
}

.course-badge {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  font-size: clamp(10px, 0.75vw, 18px);
  font-weight: 700;
  padding: 0.4vw 1vw;
  border-radius: 1.5vw;
  margin-bottom: 1.2vw;
  letter-spacing: 0.05em;
}

.course-title {
  font-size: clamp(26px, 2.3vw, 56px);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 0.6vw;
  letter-spacing: -0.02em;
}

.course-subtitle {
  font-size: clamp(14px, 1.1vw, 28px);
  color: rgba(255,255,255,0.8);
  margin-bottom: 1.8vw;
}

.course-meta {
  display: flex;
  justify-content: center;
  gap: 2.5vw;
  flex-wrap: wrap;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.6vw;
  font-size: clamp(13px, 1vw, 24px);
  color: rgba(255,255,255,0.85);
}

.meta-item i {
  font-size: clamp(12px, 0.9vw, 22px);
  opacity: 0.8;
}

/* Learning Box */
.learning-box {
  background: #FFFBEB;
  border: 0.15vw solid #FCD34D;
  border-radius: var(--radius-lg);
  padding: 2.5vw;
  margin-bottom: 2.5vw;
}

.learning-title {
  font-size: clamp(16px, 1.3vw, 32px);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1.5vw;
  display: flex;
  align-items: center;
  gap: 0.8vw;
}

.learning-title i {
  color: #F59E0B;
}

.learning-list {
  list-style: none;
  display: grid;
  gap: 1vw;
}

.learning-list li {
  display: flex;
  align-items: flex-start;
  gap: 1vw;
  font-size: clamp(14px, 1.1vw, 26px);
  color: var(--gray-700);
  line-height: 1.5;
}

.learning-list li i {
  color: var(--success);
  margin-top: 0.2vw;
  flex-shrink: 0;
}

/* Session Cards */
.sessions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5vw;
}

.session-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2vw;
  display: flex;
  align-items: center;
  gap: 1.5vw;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
}

.session-card:hover {
  transform: translateY(-0.2vw);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.session-icon {
  width: clamp(48px, 4vw, 96px);
  height: clamp(48px, 4vw, 96px);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: clamp(20px, 1.6vw, 40px);
  flex-shrink: 0;
}

.session-content {
  flex: 1;
  min-width: 0;
}

.session-title {
  font-size: clamp(15px, 1.2vw, 28px);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.4vw;
}

.session-desc {
  font-size: clamp(13px, 1vw, 24px);
  color: var(--gray-500);
  margin-bottom: 0.8vw;
  line-height: 1.4;
}

.session-meta {
  display: flex;
  gap: 1.2vw;
  font-size: clamp(12px, 0.9vw, 22px);
  color: var(--gray-500);
}

.session-meta span {
  display: flex;
  align-items: center;
  gap: 0.3vw;
}

.session-arrow {
  color: var(--gray-300);
  font-size: clamp(14px, 1.1vw, 26px);
  flex-shrink: 0;
}

.session-card:hover .session-arrow {
  color: var(--accent);
}

/* ========== Bonus Section ========== */
.bonus-divider {
  display: flex;
  align-items: center;
  gap: 1.5vw;
  margin: 4vw 0 3vw;
}

.divider-line {
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gray-300), transparent);
}

.divider-text {
  font-size: clamp(12px, 0.9vw, 20px);
  font-weight: 600;
  color: var(--gray-500);
  white-space: nowrap;
  padding: 0.5vw 1.5vw;
  background: var(--gray-100);
  border-radius: 2vw;
}

.bonus-header {
  text-align: center;
  margin-bottom: 2.5vw;
}

.bonus-badge {
  display: inline-block;
  background: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
  color: var(--white);
  font-size: clamp(10px, 0.75vw, 16px);
  font-weight: 800;
  padding: 0.4vw 1.2vw;
  border-radius: 1.5vw;
  margin-bottom: 1vw;
  letter-spacing: 0.1em;
  box-shadow: 0 0.2vw 0.8vw rgba(245, 158, 11, 0.3);
}

.bonus-title {
  font-size: clamp(20px, 1.8vw, 44px);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 0.5vw;
  letter-spacing: -0.02em;
}

.bonus-subtitle {
  font-size: clamp(14px, 1.1vw, 26px);
  color: var(--gray-500);
}

.bonus-grid {
  margin-bottom: 2.5vw;
}

.bonus-card {
  border: 2px solid transparent;
  background: linear-gradient(var(--white), var(--white)) padding-box,
              linear-gradient(135deg, #F59E0B 0%, #FBBF24 50%, #F59E0B 100%) border-box;
  position: relative;
  overflow: hidden;
}

.bonus-card::before {
  content: 'BONUS';
  position: absolute;
  top: 0.8vw;
  right: -1.5vw;
  background: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
  color: var(--white);
  font-size: clamp(8px, 0.55vw, 12px);
  font-weight: 800;
  padding: 0.2vw 2vw;
  transform: rotate(45deg);
  letter-spacing: 0.05em;
}

.bonus-card:hover {
  transform: translateY(-0.3vw);
  box-shadow: 0 0.8vw 2.5vw rgba(245, 158, 11, 0.2);
}

.bonus-summary {
  display: flex;
  justify-content: center;
  gap: 3vw;
  padding: 2vw;
  background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
  border-radius: var(--radius-lg);
  border: 1px solid #FCD34D;
}

.summary-item {
  display: flex;
  align-items: center;
  gap: 1vw;
}

.summary-item i {
  font-size: clamp(20px, 1.6vw, 40px);
  color: #F59E0B;
}

.summary-item div {
  display: flex;
  flex-direction: column;
}

.summary-item strong {
  font-size: clamp(14px, 1.1vw, 26px);
  font-weight: 700;
  color: var(--gray-900);
}

.summary-item span {
  font-size: clamp(12px, 0.9vw, 20px);
  color: var(--gray-500);
}

/* ========== Footer ========== */
.main-footer {
  background: var(--primary);
  padding: 3.5vw 3vw;
  text-align: center;
}

.footer-inner {
  max-width: 85vw;
  margin: 0 auto;
}

.footer-brand {
  font-size: clamp(16px, 1.3vw, 32px);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.3vw;
}

.footer-sub {
  font-size: clamp(13px, 1vw, 24px);
  color: var(--accent-light);
  margin-bottom: 1.2vw;
}

.footer-copy {
  font-size: clamp(11px, 0.8vw, 20px);
  color: rgba(255,255,255,0.5);
}

/* ========== Guide Panel ========== */
.guide-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  max-width: 70vw;
  height: 100%;
  background: var(--white);
  z-index: 10000;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  box-shadow: -0.3vw 0 2vw rgba(0,0,0,0.15);
  display: flex;
  flex-direction: column;
}

.guide-panel.active {
  transform: translateX(0);
}

.guide-panel-content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.guide-header {
  padding: 1.2vw 2vw;
  color: var(--white);
  position: relative;
  flex-shrink: 0;
}

.guide-close {
  position: absolute;
  top: 0.8vw;
  right: 0.8vw;
  width: clamp(28px, 2vw, 48px);
  height: clamp(28px, 2vw, 48px);
  border: none;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  font-size: clamp(14px, 1vw, 24px);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.guide-close:hover {
  background: rgba(255,255,255,0.25);
}

.guide-header-content {
  text-align: center;
  padding-top: 0.3vw;
}

.guide-icon {
  font-size: clamp(20px, 1.5vw, 36px);
  margin-bottom: 0.3vw;
  display: block;
}

.guide-header h2 {
  font-size: clamp(14px, 1.1vw, 24px);
  font-weight: 700;
  margin-bottom: 0.2vw;
}

.guide-header p {
  font-size: clamp(11px, 0.8vw, 18px);
  opacity: 0.9;
}

.progress-container {
  background: var(--gray-100);
  padding: 0.8vw 1.5vw;
  display: flex;
  align-items: center;
  gap: 1vw;
  flex-shrink: 0;
}

.progress-bar {
  flex: 1;
  height: 0.4vw;
  background: var(--gray-200);
  border-radius: 0.2vw;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  border-radius: 0.3vw;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: clamp(12px, 0.9vw, 20px);
  font-weight: 600;
  color: var(--gray-900);
  white-space: nowrap;
}

.step-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.5vw;
}

.step-card {
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(1vw); }
  to { opacity: 1; transform: translateY(0); }
}

.step-header {
  display: flex;
  align-items: center;
  gap: 0.8vw;
  margin-bottom: 1vw;
}

.step-number {
  width: clamp(28px, 2vw, 48px);
  height: clamp(28px, 2vw, 48px);
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(14px, 1vw, 24px);
  font-weight: 700;
  flex-shrink: 0;
}

.step-title {
  font-size: clamp(14px, 1.1vw, 26px);
  font-weight: 700;
  color: var(--gray-900);
}

.instruction-box {
  background: linear-gradient(135deg, #E0F2FE 0%, #BAE6FD 100%);
  border: 0.1vw solid var(--accent);
  border-radius: var(--radius-md);
  padding: 1vw 1.2vw;
  margin-bottom: 0.8vw;
}

.instruction-text {
  font-size: clamp(13px, 1vw, 22px);
  font-weight: 600;
  color: var(--gray-900);
  line-height: 1.4;
}

.tip-box {
  background: #FFFBEB;
  border-radius: var(--radius-sm);
  padding: 0.6vw 1vw;
  margin-bottom: 1vw;
  display: flex;
  align-items: flex-start;
  gap: 0.6vw;
}

.tip-box i {
  color: #F59E0B;
  font-size: clamp(12px, 0.9vw, 20px);
  margin-top: 0.1vw;
}

.tip-box span {
  font-size: clamp(11px, 0.8vw, 18px);
  color: var(--gray-700);
}

.screenshot-container {
  position: relative;
  background: var(--gray-100);
  border-radius: var(--radius-md);
  padding: 1vw;
  text-align: center;
}

.device-badge {
  position: absolute;
  top: 0.6vw;
  left: 0.6vw;
  background: var(--primary);
  color: var(--white);
  font-size: clamp(9px, 0.6vw, 14px);
  padding: 0.3vw 0.7vw;
  border-radius: 1vw;
  display: flex;
  align-items: center;
  gap: 0.3vw;
}

.screenshot-image {
  max-width: 100%;
  max-height: 60vw;
  min-height: 40vw;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.highlight-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4vw;
  background: #DC2626;
  color: var(--white);
  font-size: clamp(11px, 0.8vw, 18px);
  font-weight: 600;
  padding: 0.5vw 1vw;
  border-radius: 1vw;
  margin-top: 0.8vw;
}

.guide-nav {
  display: flex;
  gap: 0.8vw;
  padding: 1vw 1.5vw;
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  flex-shrink: 0;
}

.nav-btn {
  flex: 1;
  padding: 0.8vw 1.5vw;
  font-size: clamp(13px, 1vw, 22px);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4vw;
  transition: all 0.2s;
}

.prev-btn {
  background: var(--gray-100);
  color: var(--gray-700);
}

.prev-btn:hover:not(:disabled) {
  background: var(--gray-200);
}

.prev-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

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

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

/* ========== Completion ========== */
.completion-card {
  text-align: center;
  padding: 2.5vw 1.2vw;
}

.completion-icon {
  font-size: clamp(48px, 4.5vw, 108px);
  margin-bottom: 1.2vw;
}

.completion-card h2 {
  font-size: clamp(24px, 2vw, 48px);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 0.6vw;
}

.completion-card > p {
  font-size: clamp(14px, 1.1vw, 26px);
  color: var(--gray-500);
  margin-bottom: 2.5vw;
}

.completion-summary {
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 2vw;
  margin-bottom: 2vw;
  text-align: left;
}

.completion-summary h4 {
  font-size: clamp(15px, 1.2vw, 28px);
  font-weight: 700;
  margin-bottom: 1.2vw;
}

.completion-summary ul {
  list-style: none;
}

.completion-summary li {
  font-size: clamp(13px, 1vw, 24px);
  padding: 0.6vw 0;
  display: flex;
  align-items: center;
  gap: 0.8vw;
}

.completion-summary li i {
  color: var(--success);
}

.next-session-preview {
  margin-bottom: 2vw;
}

.next-session-preview h4 {
  font-size: clamp(13px, 1vw, 24px);
  color: var(--gray-500);
  margin-bottom: 1vw;
}

.next-session-card {
  background: var(--white);
  border: 0.15vw solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 1.2vw;
  display: flex;
  align-items: center;
  gap: 1.2vw;
  cursor: pointer;
  transition: all 0.2s;
}

.next-session-card:hover {
  background: #E0F7FA;
}

.next-icon {
  font-size: clamp(24px, 2vw, 48px);
}

.next-session-card > div {
  flex: 1;
  text-align: left;
}

.next-session-card strong {
  font-size: clamp(14px, 1.1vw, 26px);
  display: block;
  margin-bottom: 0.3vw;
}

.next-session-card p {
  font-size: clamp(12px, 0.9vw, 22px);
  color: var(--gray-500);
  margin: 0;
}

.final-completion {
  text-align: center;
}

.completion-image {
  max-width: 14vw;
  margin-bottom: 2vw;
  border-radius: var(--radius-lg);
}

.final-completion h3 {
  font-size: clamp(20px, 1.6vw, 40px);
  margin-bottom: 2vw;
}

.achievements {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1vw;
  margin-bottom: 2vw;
}

.achievement-item {
  background: var(--gray-100);
  padding: 1.1vw;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.8vw;
  font-size: clamp(13px, 1vw, 24px);
}

.achievement-icon {
  font-size: clamp(18px, 1.4vw, 34px);
}

.next-steps {
  background: #FFFBEB;
  border-radius: var(--radius-lg);
  padding: 2vw;
  text-align: left;
}

.next-steps h4 {
  font-size: clamp(15px, 1.2vw, 28px);
  font-weight: 700;
  margin-bottom: 1.2vw;
}

.next-steps ul {
  list-style: none;
}

.next-steps li {
  font-size: clamp(13px, 1vw, 24px);
  padding: 0.6vw 0;
  display: flex;
  align-items: center;
  gap: 0.8vw;
}

.next-steps li i {
  color: var(--accent);
}

.close-guide-btn {
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: 1.1vw 2.5vw;
  font-size: clamp(15px, 1.2vw, 28px);
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.6vw;
  margin-top: 2vw;
  transition: background 0.2s;
}

.close-guide-btn:hover {
  background: var(--primary-light);
}

/* ========== Mobile Responsive ========== */
@media (max-width: 1024px) {
  .mobile-menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .main-nav {
    display: none;
  }
  
  .hero-sessions {
    grid-template-columns: repeat(2, 1fr);
    max-width: 90vw;
  }
  
  .sessions-grid {
    grid-template-columns: 1fr;
  }
  
  .guide-panel {
    max-width: 100%;
  }
  
  .target-grid {
    grid-template-columns: 1fr;
  }
  
  .course-meta {
    flex-direction: column;
    gap: 1.5vw;
  }
  
  .achievements {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  :root {
    --base-font: clamp(14px, 3.5vw, 18px);
    --header-height: 56px;
  }
  
  .hero-section {
    padding: calc(var(--header-height) + 6vw) 4vw 6vw;
    min-height: auto;
  }
  
  .hero-title {
    font-size: clamp(28px, 7vw, 40px);
  }
  
  .hero-subtitle {
    font-size: clamp(14px, 3.5vw, 20px);
  }
  
  .hero-highlight {
    font-size: clamp(18px, 4.5vw, 26px);
    margin-bottom: 6vw;
  }
  
  .hero-sessions {
    gap: 3vw;
    margin-bottom: 6vw;
  }
  
  .hero-session-item {
    padding: 4vw 3vw;
  }
  
  .session-num {
    font-size: clamp(14px, 3.5vw, 18px);
  }
  
  .session-label {
    font-size: clamp(12px, 3vw, 16px);
  }
  
  .hero-cta {
    width: 100%;
    justify-content: center;
    padding: 4vw 6vw;
    font-size: clamp(15px, 4vw, 20px);
  }
  
  .course-header {
    padding: 6vw 5vw;
  }
  
  .course-title {
    font-size: clamp(22px, 5.5vw, 32px);
  }
  
  .course-subtitle {
    font-size: clamp(13px, 3.2vw, 18px);
  }
  
  .learning-box {
    padding: 5vw;
  }
  
  .learning-title {
    font-size: clamp(15px, 4vw, 20px);
  }
  
  .learning-list li {
    font-size: clamp(13px, 3.2vw, 18px);
  }
  
  .session-card {
    padding: 4vw;
    gap: 4vw;
  }
  
  .session-icon {
    width: 12vw;
    height: 12vw;
    font-size: 5vw;
  }
  
  .session-title {
    font-size: clamp(15px, 3.8vw, 20px);
  }
  
  .session-desc {
    font-size: clamp(13px, 3.2vw, 17px);
  }
  
  .session-arrow {
    display: none;
  }
  
  .guide-header {
    padding: 5vw;
  }
  
  .guide-header h2 {
    font-size: clamp(17px, 4.5vw, 24px);
  }
  
  .step-content {
    padding: 5vw;
  }
  
  .step-number {
    width: 12vw;
    height: 12vw;
    font-size: 5vw;
  }
  
  .step-title {
    font-size: clamp(17px, 4.5vw, 24px);
  }
  
  .instruction-box {
    padding: 5vw;
  }
  
  .instruction-text {
    font-size: clamp(17px, 4.5vw, 24px);
  }
  
  .tip-box {
    padding: 4vw;
  }
  
  .tip-box span {
    font-size: clamp(13px, 3.2vw, 18px);
  }
  
  .screenshot-image {
    max-height: 60vw;
  }
  
  .nav-btn {
    padding: 4vw;
    font-size: clamp(15px, 3.8vw, 20px);
  }
  
  .footer-brand {
    font-size: clamp(15px, 4vw, 22px);
  }
  
  .footer-sub {
    font-size: clamp(12px, 3vw, 18px);
  }
}