/* CSS Design System - Yuttitham Muay Thai Landing Page */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Montserrat:wght@700;800;900&display=swap');

/* Variables & Theme */
:root {
  /* Color Palette */
  --bg-primary: #070707;
  --bg-secondary: #0f0f0f;
  --bg-card: rgba(22, 22, 22, 0.75);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(212, 175, 55, 0.3);
  
  --primary-gold: #D4AF37;
  --primary-gold-rgb: 212, 175, 55;
  --gold-glow: rgba(212, 175, 55, 0.25);
  --gold-gradient: linear-gradient(135deg, #FFDF79 0%, #D4AF37 50%, #AA820A 100%);
  --gold-gradient-hover: linear-gradient(135deg, #FFEAA5 0%, #E5BF4C 50%, #C69A1B 100%);
  
  --red-corner: #E74C3C;
  --blue-corner: #2980B9;
  
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0A0;
  --text-muted: #666666;
  
  /* Layout & Spacing */
  --font-title: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  padding-bottom: 90px; /* Space for the sticky mobile CTA */
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-title);
  color: var(--text-primary);
  line-height: 1.2;
}

h1 {
  font-size: 2.2rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.6rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 480px; /* Target mobile width strictly */
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.highlight-gold {
  color: var(--primary-gold);
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 54px;
  padding: 12px 28px;
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background: var(--gold-gradient);
  color: #000000;
  box-shadow: 0 4px 20px var(--gold-glow);
  position: relative;
  overflow: hidden;
}

.btn-primary:active {
  transform: scale(0.98);
  background: var(--gold-gradient-hover);
}

/* Cards & Glassmorphism */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 20px;
  transition: var(--transition-normal);
}

.glass-card:active {
  border-color: var(--border-color-hover);
}

/* Header */
.main-header {
  padding: 20px 0;
  background: rgba(7, 7, 7, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.header-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.logo {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-badge {
  background: var(--primary-gold);
  color: #000000;
  font-size: 0.65rem;
  font-weight: 900;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Hero Section */
.hero {
  padding: 32px 0 48px;
  position: relative;
  background-image: radial-gradient(circle at 50% 20%, rgba(212, 175, 55, 0.12) 0%, transparent 60%);
}

.hero-sub {
  font-family: var(--font-title);
  color: var(--primary-gold);
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}

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

.hero-desc {
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 28px;
  color: var(--text-secondary);
}

.hero-authors {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 32px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.author-badge {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.author-badge::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.author-jefferson::before {
  background: var(--red-corner);
  box-shadow: 0 0 8px var(--red-corner);
}

.author-diego::before {
  background: var(--blue-corner);
  box-shadow: 0 0 8px var(--blue-corner);
}

/* Ebook Image / Mockup */
.mockup-container {
  width: 100%;
  max-width: 260px;
  margin: 0 auto 32px;
  perspective: 1000px;
}

.book-shadow {
  filter: drop-shadow(0 15px 25px rgba(0, 0, 0, 0.7));
  transition: transform var(--transition-normal);
}

.book-shadow:active {
  transform: rotateY(-10deg) scale(1.02);
}

.mockup-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

/* Context/Booklet Specs Section */
.section-title-area {
  margin-bottom: 32px;
}

.section-label {
  font-family: var(--font-title);
  color: var(--primary-gold);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: block;
}

.bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.bullet-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.bullet-icon {
  color: var(--primary-gold);
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.bullet-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.bullet-text p {
  margin-top: 2px;
  font-size: 0.88rem;
}

/* Pricing Section */
.price-section {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  position: relative;
}

.price-card {
  border: 2px solid var(--primary-gold);
  box-shadow: 0 8px 32px rgba(212, 175, 55, 0.08);
  position: relative;
}

.price-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gold);
  color: #000000;
  font-family: var(--font-title);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  padding: 4px 16px;
  border-radius: 20px;
  white-space: nowrap;
}

.price-title {
  margin: 12px 0 8px;
  font-size: 1.1rem;
}

.price-amount-wrapper {
  margin: 20px 0;
}

.price-installments {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.price-installments span {
  font-size: 1.2rem;
  color: var(--primary-gold);
}

.price-total {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.price-features {
  margin: 24px 0;
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.price-feat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
}

.price-feat-item span {
  color: var(--primary-gold);
  font-size: 1.1rem;
}

.trust-badges {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.trust-badge-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.trust-badge-item span {
  font-size: 0.95rem;
}

/* FAQ Section */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  padding: 18px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  text-align: left;
  outline: none;
}

.faq-question h3 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  padding-right: 12px;
  line-height: 1.4;
}

.faq-icon {
  color: var(--primary-gold);
  transition: transform var(--transition-normal);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), opacity var(--transition-normal);
  opacity: 0;
}

.faq-answer-content {
  padding: 0 20px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Open states for FAQ */
.faq-item.active {
  border-color: var(--border-color-hover);
  background: rgba(22, 22, 22, 0.9);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-item.active .faq-answer {
  opacity: 1;
}

/* Floating Sticky CTA Container */
.sticky-cta-container {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px 20px 20px;
  background: linear-gradient(180deg, transparent 0%, rgba(7, 7, 7, 0.95) 30%, #070707 100%);
  z-index: 99;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.sticky-cta-container.visible {
  transform: translateY(0);
}

.sticky-cta-price {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.sticky-cta-price strong {
  color: var(--primary-gold);
  font-size: 0.9rem;
}

/* Footer */
.main-footer {
  padding: 32px 0 40px;
  background: #040404;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-logo {
  font-family: var(--font-title);
  font-weight: 800;
  color: var(--primary-gold);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

.footer-link:active {
  color: var(--primary-gold);
}

.footer-copyright {
  margin-top: 12px;
}