/* assets/css/style.css */
@import url('https://fonts.googleapis.com/css2?family=Kanit:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=Sarabun:wght@300;400;500;600;700&display=swap');

:root {
  --font-heading: 'Kanit', sans-serif;
  --font-body: 'Sarabun', sans-serif;
  
  /* White & Light Theme Palette */
  --bg-main: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --border-color: #E2E8F0;
  --border-light: #F1F5F9;
  
  /* Typography Colors */
  --text-dark: #0F172A;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  
  /* Brand Accents */
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: #EEF2FF;
  --accent-purple: #7C3AED;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #EF4444;
  
  /* Shadow Tokens */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 20px 30px -5px rgba(15, 23, 42, 0.12);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-dark);
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #6D28D9 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
  background: #FFFFFF;
  color: var(--text-dark);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: #F1F5F9;
  border-color: #CBD5E1;
}

.btn-outline-primary {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid #C7D2FE;
}

.btn-outline-primary:hover {
  background: #E0E7FF;
}

.btn-danger {
  background: #FEF2F2;
  color: var(--accent-rose);
  border: 1px solid #FECACA;
}

.btn-danger:hover {
  background: #FEE2E2;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 17px;
  border-radius: var(--radius-md);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, #EEF2FF 0%, var(--bg-main) 70%);
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #FFFFFF;
  border: 1px solid #C7D2FE;
  color: var(--primary);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 36px;
}

/* Notice Banner (Important Policy) */
.notice-box {
  background: #FFFBEB;
  border: 1px solid #FCD34D;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  max-width: 780px;
  margin: 0 auto 40px;
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.notice-box.danger {
  background: #FEF2F2;
  border-color: #FCA5A5;
}

.notice-icon {
  font-size: 22px;
  flex-shrink: 0;
  line-height: 1;
}

.notice-content h4 {
  font-size: 15px;
  font-weight: 600;
  color: #92400E;
  margin-bottom: 4px;
}

.notice-box.danger .notice-content h4 {
  color: #991B1B;
}

.notice-content p {
  font-size: 14px;
  color: #B45309;
  line-height: 1.5;
}

.notice-box.danger .notice-content p {
  color: #B91C1C;
}

/* Cards & Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #CBD5E1;
}

/* Book Card */
.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: #C7D2FE;
}

.book-cover {
  position: relative;
  width: 100%;
  height: 240px;
  background: #F1F5F9;
  overflow: hidden;
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
  transform: scale(1.05);
}

.book-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(6px);
  color: #FFFFFF;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
}

.book-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.book-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.book-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 18px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Pricing Section */
.pricing-section {
  padding: 80px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.pricing-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(180deg, #FFFFFF 0%, #FAFAFF 100%);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.price-val {
  font-size: 42px;
  font-weight: 700;
  color: var(--text-dark);
  margin: 16px 0;
  font-family: var(--font-heading);
}

.price-val span {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 24px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.pricing-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dark);
}

.pricing-feature.disabled {
  color: var(--text-light);
  text-decoration: line-through;
}

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

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #FFFFFF;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--text-dark);
  transition: all 0.2s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #FFFFFF;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.data-table th {
  background: #F8FAFC;
  padding: 14px 18px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-dark);
  vertical-align: middle;
}

.data-table tr:hover td {
  background: #F8FAFC;
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
}

.badge-real {
  background: #DCFCE7;
  color: #15803D;
  border: 1px solid #BBF7D0;
}

.badge-dummy {
  background: #F3E8FF;
  color: #7E22CE;
  border: 1px solid #E9D5FF;
}

.badge-trial {
  background: #FEF3C7;
  color: #B45309;
  border: 1px solid #FDE68A;
}

.badge-active {
  background: #DCFCE7;
  color: #15803D;
  border: 1px solid #BBF7D0;
}

.badge-expired {
  background: #FEE2E2;
  color: #B91C1C;
  border: 1px solid #FECACA;
}

/* Reader Protection */
.reader-canvas-container {
  position: relative;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.reader-watermark {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  z-index: 50;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(4, 1fr);
  opacity: 0.12;
  font-size: 16px;
  font-weight: 600;
  color: #000000;
  transform: rotate(-25deg);
  overflow: hidden;
}

@media print {
  body {
    display: none !important;
  }
}

/* Footer */
.footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 30px;
  margin-top: 80px;
  font-size: 14px;
  color: var(--text-muted);
}