/* ============================================
   TRỊ GAI CỘT SỐNG - Main Stylesheet
   Design: Ấm áp, chân thật, dễ đọc
   ============================================ */

/* --- CSS Variables --- */
:root {
    /* Colors - Warm & Natural */
    --color-primary: #8B4513;        /* Saddle Brown - Ấm áp */
    --color-primary-light: #A0522D;  /* Sienna */
    --color-primary-dark: #5D2E0C;
    --color-secondary: #2E7D32;      /* Green - Tự nhiên */
    --color-secondary-light: #4CAF50;
    
    --color-bg: #FDF8F3;             /* Warm white */
    --color-bg-alt: #F5EDE4;         /* Slightly darker */
    --color-bg-dark: #E8DDD2;
    
    --color-text: #3D3D3D;           /* Dark gray - dễ đọc */
    --color-text-light: #666666;
    --color-text-muted: #888888;
    
    --color-accent: #D4A574;         /* Warm tan */
    --color-warning: #E65100;
    --color-success: #2E7D32;
    --color-error: #C62828;
    
    /* Typography */
    --font-heading: 'Crimson Text', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3rem;
    --space-xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(139, 69, 19, 0.08);
    --shadow-md: 0 4px 12px rgba(139, 69, 19, 0.12);
    --shadow-lg: 0 8px 24px rgba(139, 69, 19, 0.16);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

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

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
    list-style: none;
}

/* --- Container --- */
.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-sm);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-sm);
}

strong {
    font-weight: 600;
    color: var(--color-primary-dark);
}

em {
    font-style: italic;
    color: var(--color-text-light);
}

blockquote {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-style: italic;
    padding: var(--space-md);
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-alt);
    margin: var(--space-md) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.section-title {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: var(--space-lg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: var(--space-sm) auto 0;
    border-radius: 2px;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(253, 248, 243, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--space-sm) 0;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary-dark);
}

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

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-normal);
}

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

.btn-nav {
    background: var(--color-primary);
    color: white !important;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
}

.btn-nav:hover {
    background: var(--color-primary-light);
}

.btn-nav::after {
    display: none;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-primary);
    cursor: pointer;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: calc(var(--space-xl) + 60px) 0 var(--space-xl);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    text-align: center;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    letter-spacing: 0.1em;
    color: var(--color-primary-dark);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 1.3rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.hero-divider {
    width: 80px;
    height: 2px;
    background: var(--color-accent);
    margin: var(--space-md) auto;
}

.hero-note {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-style: italic;
}

/* ============================================
   SYMPTOMS SECTION
   ============================================ */
.symptoms {
    padding: var(--space-xl) 0;
    background: white;
}

.symptoms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.symptom-card {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.symptom-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.symptom-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
}

.symptom-icon i {
    font-size: 1.5rem;
    color: white;
}

.symptom-card p {
    font-size: 0.95rem;
    color: var(--color-text);
    margin: 0;
}

.symptoms-conclusion {
    text-align: center;
    font-size: 1.2rem;
    color: var(--color-text);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-bg-dark);
}

/* ============================================
   REALITY SECTION
   ============================================ */
.reality {
    padding: var(--space-xl) 0;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
}

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

.reality-title {
    font-size: 2rem;
    color: white;
    margin-bottom: var(--space-md);
}

.reality-title .highlight {
    display: block;
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-top: var(--space-xs);
}

.reality-intro {
    font-size: 1.1rem;
    margin-bottom: var(--space-md);
    opacity: 0.9;
}

.reality-list {
    max-width: 400px;
    margin: 0 auto var(--space-lg);
    text-align: left;
}

.reality-list li {
    padding: var(--space-xs) 0;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.reality-list i {
    color: var(--color-warning);
}

.reality-fear {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    max-width: 500px;
    margin: 0 auto;
}

.reality-fear p {
    font-size: 0.95rem;
    opacity: 0.8;
    margin-bottom: var(--space-sm);
}

.reality-fear blockquote {
    background: transparent;
    border-left-color: var(--color-accent);
    color: white;
    padding: var(--space-sm);
    margin: 0;
    font-size: 1.1rem;
}

/* ============================================
   STORY SECTION
   ============================================ */
.story {
    padding: var(--space-xl) 0;
    background: var(--color-bg);
}

.story-timeline {
    position: relative;
    padding-left: 40px;
}

.story-timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-accent));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-lg);
}

.timeline-marker {
    position: absolute;
    left: -40px;
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--color-bg);
}

.timeline-marker span {
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
}

.timeline-content {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.timeline-content h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.timeline-content p {
    margin-bottom: var(--space-xs);
}

.timeline-content p:last-child {
    margin-bottom: 0;
}

.worry {
    background: #FFF3E0;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-warning);
    margin-top: var(--space-sm);
}

.pain-list {
    margin: var(--space-sm) 0;
}

.pain-list li {
    padding: var(--space-xs) 0;
    padding-left: var(--space-md);
    position: relative;
}

.pain-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-warning);
    font-weight: bold;
}

.negative-thought {
    background: #FFEBEE;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    color: var(--color-error);
    margin-top: var(--space-sm);
}

/* ============================================
   TURNING POINT SECTION
   ============================================ */
.turning-point {
    padding: var(--space-xl) 0;
    background: white;
}

.turning-point .section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.title-icon {
    font-size: 2rem;
}

.turning-content {
    max-width: 700px;
    margin: 0 auto;
}

.memory-box {
    background: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
}

.dialogue {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin: var(--space-md) 0;
}

.dialogue .question {
    font-style: italic;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.dialogue .answer {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--color-primary-dark);
    margin: 0;
    padding-left: var(--space-md);
    border-left: 3px solid var(--color-secondary);
}

.action-box {
    background: #E8F5E9;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
}

.action-box h3 {
    color: var(--color-secondary);
    margin-bottom: var(--space-sm);
}

.result-box {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-light));
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    color: white;
}

.result-box h3 {
    color: white;
    margin-bottom: var(--space-md);
    text-align: center;
}

.result-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.result-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
}

.result-item.highlight {
    background: rgba(255, 255, 255, 0.3);
}

.result-item .day {
    font-weight: 600;
    min-width: 100px;
}

.result-item .outcome {
    flex: 1;
}

/* ============================================
   LIVING WITH SECTION
   ============================================ */
.living-with {
    padding: var(--space-xl) 0;
    background: var(--color-bg);
    text-align: center;
}

.honest-note {
    font-size: 1.2rem;
    max-width: 500px;
    margin: 0 auto var(--space-lg);
}

.methods-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.method-card {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.method-card:hover {
    transform: translateY(-4px);
}

.method-icon {
    font-size: 3rem;
    margin-bottom: var(--space-sm);
}

.method-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.method-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin: 0;
}

.important-mindset {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    max-width: 500px;
    margin: 0 auto var(--space-lg);
    text-align: left;
}

.important-mindset h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-sm);
    text-align: center;
}

.important-mindset li {
    padding: var(--space-xs) 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.important-mindset i {
    color: var(--color-success);
}

.mindset-sub {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-text-light);
}

.btn-detail {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.btn-detail small {
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.9;
}

.btn-detail:hover {
    background: var(--color-primary-light);
    color: white;
    transform: translateX(4px);
}

/* ============================================
   RESULTS SECTION
   ============================================ */
.results {
    padding: var(--space-xl) 0;
    background: white;
}

.results-content {
    max-width: 700px;
    margin: 0 auto;
}

.current-state {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.current-state .lead {
    font-size: 1.3rem;
    margin-bottom: var(--space-md);
}

.activities {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
}

.activity {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    background: #E8F5E9;
    color: var(--color-secondary);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.doctor-feedback {
    background: var(--color-bg);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    position: relative;
}

.doctor-feedback .quote-icon {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    color: var(--color-accent);
    opacity: 0.5;
    font-size: 2rem;
}

.doctor-feedback blockquote {
    background: white;
    font-size: 1.1rem;
}

.doctor-feedback .note {
    font-style: italic;
    color: var(--color-text-light);
    text-align: center;
    margin: 0;
}

/* ============================================
   SIGNS SECTION
   ============================================ */
.signs {
    padding: var(--space-xl) 0;
    background: var(--color-bg-alt);
}

.signs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.sign-card {
    background: white;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.sign-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.3rem;
}

.sign-card.wrong .sign-icon {
    background: #FFEBEE;
    color: var(--color-error);
}

.sign-card.right .sign-icon {
    background: #E8F5E9;
    color: var(--color-success);
}

.sign-card.success .sign-icon {
    background: #FFF8E1;
    color: #F9A825;
}

.sign-card p {
    margin-bottom: var(--space-xs);
}

.verdict {
    font-size: 0.9rem;
    font-weight: 500;
}

.sign-card.wrong .verdict {
    color: var(--color-error);
}

.sign-card.right .verdict {
    color: var(--color-success);
}

.sign-card.success .verdict {
    color: #F9A825;
}

/* ============================================
   GRATITUDE SECTION
   ============================================ */
.gratitude {
    padding: var(--space-xl) 0;
    background: white;
    text-align: center;
}

.gratitude-intro {
    margin-bottom: var(--space-lg);
}

.no-sell {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.donation-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
    max-width: 700px;
    margin: 0 auto var(--space-lg);
}

.donation-card {
    background: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.donation-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.donation-card.featured {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
}

.donation-card .amount {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.donation-card.featured .amount {
    color: white;
}

.donation-card .meaning {
    font-size: 0.95rem;
    margin: var(--space-xs) 0 0;
}

.donation-note {
    font-style: italic;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.payment-methods {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.payment-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.payment-btn.paypal {
    background: #003087;
    color: white;
}

.payment-btn.paypal:hover {
    background: #001F5C;
    color: white;
}

.payment-btn.bank {
    background: var(--color-secondary);
    color: white;
}

.payment-btn.bank:hover {
    background: var(--color-secondary-light);
    color: white;
}

/* ============================================
   SHARE SECTION
   ============================================ */
.share-section {
    padding: var(--space-lg) 0;
    background: var(--color-bg);
}

.share-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.share-content h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.share-note {
    font-style: italic;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
}

.share-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

.share-btn:hover {
    transform: scale(1.1);
    color: white;
}

.share-btn.facebook {
    background: #1877F2;
}

.share-btn.zalo {
    background: #0068FF;
    font-size: 0.7rem;
    font-weight: 700;
}

.share-btn.copy {
    background: var(--color-text-light);
}

/* ============================================
   DISCLAIMER SECTION
   ============================================ */
.disclaimer {
    padding: var(--space-md) 0;
    background: #FFF3E0;
}

.disclaimer-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.disclaimer-content h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    font-size: 1rem;
    color: var(--color-warning);
    margin-bottom: var(--space-sm);
}

.disclaimer-content p {
    font-size: 0.9rem;
    margin: 0;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-lg) 0;
    background: var(--color-primary-dark);
    color: white;
    text-align: center;
}

.footer-quote {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-style: italic;
    margin-bottom: var(--space-md);
    opacity: 0.9;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: white;
}

/* Footer Contact */
.footer-contact {
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
}

.footer-contact h4 {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
    color: rgba(255, 255, 255, 0.9);
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255, 255, 255, 0.85);
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    transform: translateY(-2px);
}

.contact-item i {
    font-size: 1rem;
}

.contact-item .zalo-icon {
    background: #0068ff;
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

@media (max-width: 768px) {
    .contact-info {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-item {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

.copyright {
    font-size: 0.85rem;
    opacity: 0.6;
    margin: 0;
}

/* ============================================
   MOBILE MENU
   ============================================ */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: white;
    z-index: 2000;
    padding: var(--space-md);
    transition: right var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.mobile-menu-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text);
    cursor: pointer;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-nav a {
    padding: var(--space-sm);
    font-size: 1.1rem;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.mobile-nav a:hover {
    background: var(--color-bg);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        min-height: auto;
        padding: calc(var(--space-xl) + 40px) 0 var(--space-lg);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .symptoms-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .reality-title {
        font-size: 1.5rem;
    }
    
    .reality-title .highlight {
        font-size: 1.2rem;
    }
    
    .story-timeline {
        padding-left: 30px;
    }
    
    .timeline-marker {
        left: -30px;
        width: 26px;
        height: 26px;
    }
    
    .story-timeline::before {
        left: 12px;
    }
    
    .methods-grid {
        grid-template-columns: 1fr;
    }
    
    .donation-options {
        grid-template-columns: 1fr;
    }
    
    .activities {
        flex-direction: column;
        align-items: center;
    }
    
    .payment-methods {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .symptoms-grid {
        grid-template-columns: 1fr;
    }
    
    .signs-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 0 var(--space-sm);
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   REAL IMAGES GALLERY
   ============================================ */
.real-images {
    padding: var(--space-xl) 0;
    background: var(--color-primary-dark);
    color: white;
}

.real-images .section-title {
    color: white;
}

.real-images .section-title::after {
    background: linear-gradient(90deg, var(--color-accent), white);
}

.gallery-intro {
    text-align: center;
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: var(--space-lg);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.gallery-item:hover {
    transform: scale(1.02);
}

.gallery-item.main {
    grid-column: 1 / -1;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.gallery-item.main img {
    max-height: 450px;
}

.gallery-item:not(.main) img {
    height: 280px;
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
    padding: var(--space-lg) var(--space-md) var(--space-md);
    color: white;
}

.gallery-caption strong {
    display: block;
    font-size: 1.1rem;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.gallery-caption p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
}

.gallery-disclaimer {
    text-align: center;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    margin-top: -5px;
    margin-bottom: var(--space-md);
}

.gallery-note {
    text-align: center;
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.9rem;
    opacity: 0.8;
}

.gallery-note i {
    margin-right: var(--space-xs);
    color: var(--color-accent);
}

/* ============================================
   ENHANCED SHARE SECTION
   ============================================ */
.share-section {
    padding: var(--space-xl) 0;
    background: linear-gradient(135deg, #E8F5E9 0%, #C8E6C9 100%);
}

.share-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.share-content h2 {
    font-size: 1.8rem;
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.share-content > p {
    font-size: 1.1rem;
    line-height: 1.8;
}

.share-note {
    font-style: italic;
    color: var(--color-text-light);
    margin: var(--space-sm) 0 var(--space-lg);
    font-size: 1rem;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-lg);
    color: white;
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    min-width: 140px;
}

.share-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    color: white;
}

.share-btn i {
    font-size: 1.2rem;
}

.share-btn.facebook {
    background: #1877F2;
}

.share-btn.facebook:hover {
    background: #0d65d9;
}

.share-btn.zalo {
    background: #0068FF;
}

.share-btn.zalo:hover {
    background: #0055cc;
}

.share-btn.copy {
    background: var(--color-primary);
}

.share-btn.copy:hover {
    background: var(--color-primary-light);
}

/* ============================================
   ENHANCED GRATITUDE SECTION
   ============================================ */
.gratitude {
    padding: var(--space-xl) 0;
    background: white;
    text-align: center;
}

.gratitude .section-title {
    font-size: 1.8rem;
}

.gratitude-intro {
    margin-bottom: var(--space-lg);
}

.no-sell {
    font-size: 1rem;
    color: var(--color-text);
    line-height: 1.8;
    margin-bottom: 0;
}

.donation-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    max-width: 800px;
    margin: 0 auto var(--space-lg);
}

.donation-card {
    background: var(--color-bg);
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-lg);
    border: 3px solid transparent;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.donation-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.donation-card.selected {
    border-color: var(--color-primary);
    background: var(--color-bg-alt);
}

.donation-card.featured {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: white;
    transform: scale(1.05);
}

.donation-card.featured:hover {
    transform: scale(1.08);
}

.donation-card .amount {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.donation-card.featured .amount {
    color: white;
}

.donation-card .meaning {
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
}

.donation-note {
    font-size: 1rem;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.donation-note strong {
    display: block;
    color: var(--color-primary);
}

.donation-purpose {
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-light);
    max-width: 500px;
    margin: var(--space-sm) auto var(--space-md);
}

.payment-methods {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.payment-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.payment-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   GALLERY RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-item.main img,
    .gallery-item:not(.main) img {
        height: 250px;
        max-height: none;
    }
    
    .donation-options {
        grid-template-columns: 1fr;
    }
    
    .donation-card.featured {
        transform: none;
    }
    
    .donation-card.featured:hover {
        transform: translateY(-6px);
    }
    
    .share-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .share-btn {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .gallery-caption {
        padding: var(--space-md) var(--space-sm) var(--space-sm);
    }
    
    .gallery-caption strong {
        font-size: 1rem;
    }
    
    .gallery-caption p {
        font-size: 0.85rem;
    }
}