/* ===================================
   Ultherapy HK - Modern Stylesheet
   =================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary: #8B5CF6;
    --primary-dark: #7C3AED;
    --primary-light: #A78BFA;
    --secondary: #EC4899;
    --accent: #F59E0B;

    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --text-light: #6B7280;
    --text-white: #FFFFFF;

    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-dark: #111827;

    --border-light: #E5E7EB;
    --border-medium: #D1D5DB;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.3);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Font */
    --font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

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

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

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

.logo-hk {
    font-weight: 400;
    opacity: 0.8;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-menu a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--spacing-sm) 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-menu a:hover {
    color: var(--primary);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px var(--spacing-lg) var(--spacing-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    opacity: 0.1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(245, 158, 11, 0.2) 0%, transparent 40%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-primary);
    color: var(--text-white);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--shadow-md), 0 0 20px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(139, 92, 246, 0.4);
}

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

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.5s both;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-light);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    animation: fadeIn 0.6s ease 0.8s both;
}

.scroll-indicator span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    margin: 0 auto;
    border-right: 2px solid var(--primary);
    border-bottom: 2px solid var(--primary);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
}

/* ===================================
   Sections
   =================================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
}

/* ===================================
   Content Cards (What is Ultherapy)
   =================================== */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.content-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

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

.content-card.featured {
    grid-column: 1 / -1;
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
}

.content-card.featured .card-icon {
    background: rgba(255, 255, 255, 0.2);
}

.content-card.featured h3 {
    color: var(--text-white);
}

.content-card.featured p {
    color: rgba(255, 255, 255, 0.9);
}

.card-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(139, 92, 246, 0.1);
    border-radius: var(--radius-md);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

.content-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.content-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   Process Timeline (How it Works)
   =================================== */
.process-timeline {
    display: grid;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.process-step {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.process-step:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.process-step:nth-child(even) {
    direction: rtl;
}

.process-step:nth-child(even) > * {
    direction: ltr;
}

.step-content {
    padding: var(--spacing-md);
}

.step-number {
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.5;
    margin-bottom: var(--spacing-md);
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.step-content p {
    color: var(--text-secondary);
}

.step-visual {
    height: 200px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* Animations for step visuals */
.wave-animation {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--gradient-primary);
    animation: pulse 2s ease-in-out infinite;
}

.wave-animation::before,
.wave-animation::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 2px solid var(--primary);
    animation: wave 2s ease-out infinite;
}

.wave-animation::before {
    width: 120px;
    height: 120px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.wave-animation::after {
    width: 160px;
    height: 160px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 0.3s;
}

.heat-animation {
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, #ef4444 0%, #f97316 50%, #fbbf24 100%);
    border-radius: 50%;
    animation: glow 1.5s ease-in-out infinite;
}

.collagen-animation {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.collagen-animation::before {
    content: '';
    display: block;
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50%;
    animation: pop 0.6s ease forwards;
}

.lift-animation {
    width: 60px;
    height: 80px;
    border: 3px solid var(--primary);
    border-radius: 50% 50% 45% 45%;
    position: relative;
    animation: lift 2s ease-in-out infinite;
}

.lift-animation::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

/* Depth Diagram */
.depth-diagram {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
}

.depth-diagram h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
}

.skin-layers {
    max-width: 500px;
    margin: 0 auto;
}

.layer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    position: relative;
}

.layer.epidermis {
    background: #fef3c7;
}

.layer.dermis {
    background: #fde68a;
}

.layer.deep-dermis {
    background: #fcd34d;
}

.layer.smas {
    background: #f59e0b;
    color: var(--text-white);
}

.layer-name {
    font-weight: 600;
}

.layer-depth {
    font-size: 0.875rem;
    opacity: 0.8;
}

.treatment-point {
    position: absolute;
    right: 80px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--primary);
    animation: pulse 1.5s ease-in-out infinite;
}

.diagram-note {
    margin-top: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ===================================
   Treatment Areas
   =================================== */
.treatment-showcase {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.face-diagram {
    position: relative;
    aspect-ratio: 3/4;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.face-outline {
    position: relative;
    width: 80%;
    height: 80%;
}

.face-svg {
    width: 100%;
    height: 100%;
    color: var(--border-medium);
}

.hotspot {
    position: absolute;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    cursor: pointer;
    z-index: 10;
}

.hotspot::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary);
    border-radius: 50%;
    transition: transform var(--transition-base);
}

.hotspot:hover::before {
    transform: scale(1.3);
}

.hotspot-pulse {
    position: absolute;
    inset: -5px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.treatment-areas-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.treatment-area-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
}

.treatment-area-card:hover,
.treatment-area-card.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.treatment-area-card.active {
    background: rgba(139, 92, 246, 0.05);
}

.area-icon {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.area-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

/* ===================================
   Benefits
   =================================== */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
}

.benefit-card {
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    text-align: center;
    transition: all var(--transition-base);
}

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

.benefit-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    font-size: 2rem;
}

.benefit-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

/* Comparison Table */
.comparison-section {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.comparison-section h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xl);
}

.comparison-table-wrapper {
    overflow-x: auto;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    text-align: center;
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
}

.comparison-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.9rem;
}

.comparison-table th.highlight {
    background: var(--gradient-primary);
    color: var(--text-white);
}

.comparison-table td.highlight {
    background: rgba(139, 92, 246, 0.05);
    font-weight: 500;
    color: var(--primary);
}

.comparison-table tbody tr:hover {
    background: var(--bg-secondary);
}

/* ===================================
   Expectations
   =================================== */
.expectations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.expectation-card {
    background: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.expectation-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.expectation-icon {
    font-size: 1.75rem;
}

.expectation-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.expectation-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.expectation-list li {
    position: relative;
    padding-left: var(--spacing-xl);
    color: var(--text-secondary);
}

.expectation-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 600;
}

.expectation-list.warning li::before {
    content: '✗';
    color: var(--secondary);
}

.expectation-card .note {
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--text-light);
    font-style: italic;
}

/* Time Breakdown */
.time-breakdown {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.time-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.time-area {
    font-weight: 500;
}

.time-duration {
    color: var(--primary);
    font-weight: 600;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 5px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-light);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-point {
    position: absolute;
    left: -22px;
    top: 5px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

.timeline-content strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===================================
   FAQ Section
   =================================== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

.faq-item:hover {
    border-color: var(--primary-light);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    text-align: left;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    transition: all var(--transition-base);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--primary);
    transition: transform var(--transition-base);
}

.faq-icon::before {
    width: 100%;
    height: 2px;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

.faq-icon::after {
    width: 2px;
    height: 100%;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
}

.faq-item.active .faq-icon::after {
    transform: translateX(-50%) rotate(90deg);
}

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

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===================================
   SEO Section
   =================================== */
.seo-section {
    background: var(--bg-tertiary);
}

.seo-content {
    max-width: 900px;
    margin: 0 auto;
}

.seo-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.seo-text {
    margin-bottom: var(--spacing-xl);
}

.seo-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.9;
    text-align: justify;
}

.seo-keywords {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.seo-keywords span {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-light);
    border: 1px solid var(--border-light);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand p {
    margin-top: var(--spacing-md);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-white);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-disclaimer {
    margin-bottom: var(--spacing-md);
}

.footer-disclaimer p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.7;
}

.footer-copyright p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ===================================
   Back to Top
   =================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 100;
}

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

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

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
    40% { transform: rotate(45deg) translateY(-10px); }
    60% { transform: rotate(45deg) translateY(-5px); }
}

@keyframes pulse {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.1);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes wave {
    0% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(1.8);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(239, 68, 68, 0.5);
    }
    50% {
        box-shadow: 0 0 40px rgba(239, 68, 68, 0.8);
    }
}

@keyframes pop {
    0% {
        opacity: 0;
        transform: scale(0);
    }
    70% {
        transform: scale(1.2);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes lift {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .process-step {
        grid-template-columns: 1fr;
    }

    .process-step:nth-child(even) {
        direction: ltr;
    }

    .treatment-showcase {
        grid-template-columns: 1fr;
    }

    .face-diagram {
        max-width: 400px;
        margin: 0 auto;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 15px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .stat-number {
        font-size: 2rem;
    }

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

    .content-card.featured {
        grid-column: 1;
    }

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

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

    .comparison-table {
        font-size: 0.85rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }

    .step-visual {
        height: 150px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .hero {
        padding: 100px var(--spacing-md) var(--spacing-2xl);
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .faq-question {
        font-size: 0.95rem;
        padding: var(--spacing-md);
    }

    .faq-answer p {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }

    .back-to-top {
        width: 44px;
        height: 44px;
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
}

/* ===================================
   Breadcrumbs
   =================================== */
.breadcrumbs {
    background: var(--bg-secondary);
    padding: var(--spacing-md) 0;
    margin-top: 70px;
    border-bottom: 1px solid var(--border-light);
}

.breadcrumbs .container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
}

.breadcrumbs a {
    color: var(--text-light);
    transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
    color: var(--primary);
}

.breadcrumbs .separator {
    color: var(--text-light);
    opacity: 0.5;
}

.breadcrumbs .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* Navigation Active State */
.nav-menu a.active {
    color: var(--primary);
}

.nav-menu a.active::after {
    width: 100%;
}

/* ===================================
   Contextual Intro Section
   =================================== */
.intro-section {
    background: var(--bg-secondary);
    padding: var(--spacing-2xl) 0;
    border-bottom: 1px solid var(--border-light);
}

.intro-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.intro-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.intro-content p {
    color: var(--text-secondary);
    line-height: 1.9;
    font-size: 1.05rem;
}

/* ===================================
   User Guide Section
   =================================== */
.user-guide-section {
    padding: var(--spacing-3xl) 0;
}

.user-guide-content {
    max-width: 900px;
    margin: 0 auto;
}

.user-guide-content h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.user-guide-content > p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: var(--spacing-lg);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.guide-step {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary);
}

.guide-step h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* ===================================
   Latest Articles Section
   =================================== */
.latest-articles {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.latest-articles h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.latest-articles .section-subtitle {
    color: var(--text-light);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.article-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition-base);
}

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

.article-content {
    padding: var(--spacing-lg);
}

.article-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    color: var(--primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.article-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.article-content h3 a {
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.article-content h3 a:hover {
    color: var(--primary);
}

.article-content > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--text-light);
}

.view-all-link {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.view-all-link a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.view-all-link a:hover {
    gap: var(--spacing-md);
}

/* ===================================
   Blog Index Page
   =================================== */
.blog-index {
    padding: var(--spacing-3xl) 0;
}

.blog-index-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.blog-index-header h1 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-index-intro {
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.8;
}

.blog-category {
    margin-bottom: var(--spacing-3xl);
}

.category-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-light);
}

.category-icon {
    font-size: 1.25rem;
}

.blog-cta {
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl);
    text-align: center;
    color: var(--text-white);
}

.blog-cta h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.blog-cta p {
    opacity: 0.9;
    margin-bottom: var(--spacing-xl);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.blog-cta .btn-primary {
    background: var(--bg-primary);
    color: var(--primary);
}

.blog-cta .btn-primary:hover {
    background: var(--bg-secondary);
}

/* ===================================
   Blog Article Pages
   =================================== */
.blog-content {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

.blog-article {
    max-width: 800px;
    margin: 0 auto;
}

.blog-header {
    margin-bottom: var(--spacing-2xl);
}

.article-category {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(139, 92, 246, 0.1);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-md);
}

.blog-header h1 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.blog-header .article-meta {
    font-size: 0.9rem;
    color: var(--text-light);
}

.blog-body {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

.blog-body .lead {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 400;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-light);
}

.blog-body h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.blog-body p {
    margin-bottom: var(--spacing-lg);
}

.blog-body a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-body a:hover {
    color: var(--primary-dark);
}

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

.blog-footer {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
}

.related-articles h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.related-articles ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.related-articles li {
    padding-left: var(--spacing-lg);
    position: relative;
}

.related-articles li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.related-articles a {
    color: var(--primary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.related-articles a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ===================================
   Supporting Pages (About, Contact, etc)
   =================================== */
.page-content {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-header h1 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.page-body {
    max-width: 800px;
    margin: 0 auto;
}

.page-body h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
}

.page-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.page-body p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: var(--spacing-lg);
}

.page-body ul,
.page-body ol {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.page-body li {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.page-body a {
    color: var(--primary);
}

.page-body a:hover {
    text-decoration: underline;
}

/* Value Cards (About Page) */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.value-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
}

.value-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.value-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
}

.value-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Offering Cards (About Page) */
.offerings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.offering-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.offering-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
    color: var(--primary);
}

.offering-card p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

/* Contact Info (Contact Page) */
.contact-info {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    margin-top: 0;
}

.contact-item p {
    font-size: 0.9rem;
    margin-bottom: 0;
}

.contact-item a {
    color: var(--primary);
    word-break: break-all;
}

/* Legal Pages (Privacy, Terms) */
.legal-content h2:first-of-type {
    margin-top: 0;
}

.legal-content p:last-child {
    font-style: italic;
    color: var(--text-light);
}

/* ===================================
   Responsive Additions
   =================================== */
@media (max-width: 768px) {
    .breadcrumbs {
        margin-top: 70px;
    }

    .breadcrumbs .container {
        flex-wrap: wrap;
    }

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

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

    .values-grid,
    .offerings-grid {
        grid-template-columns: 1fr;
    }

    .blog-cta {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
}

/* Print styles */
@media print {
    .navbar,
    .back-to-top,
    .scroll-indicator,
    .breadcrumbs {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-xl) 0;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }

    .blog-content,
    .page-content,
    .blog-index {
        padding-top: 0;
    }
}