/* ============================================
   Green Hong Kong Campaign - Styles
   ============================================ */

/* --- CSS Variables --- */
:root {
    --green-50: #f0fdf4;
    --green-100: #dcfce7;
    --green-200: #bbf7d0;
    --green-300: #86efac;
    --green-400: #4ade80;
    --green-500: #22c55e;
    --green-600: #16a34a;
    --green-700: #15803d;
    --green-800: #166534;
    --green-900: #14532d;
    --green-950: #052e16;

    --primary: #1a8a3f;
    --primary-dark: #0f6b2e;
    --primary-light: #2ebd57;
    --accent: #f0b429;

    --white: #ffffff;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;

    --font-zh: 'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
    --font-en: 'Inter', 'Helvetica Neue', Arial, sans-serif;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-zh);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-zh);
    border-radius: var(--radius-xl);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.1rem;
}

/* --- Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.4s ease;
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 12px 0;
    box-shadow: 0 1px 20px rgba(0,0,0,0.08);
}

.navbar.scrolled .nav-link {
    color: var(--gray-700);
}
.navbar.scrolled .nav-link:hover {
    color: var(--primary);
}
.navbar.scrolled .nav-logo .logo-text {
    color: var(--gray-900);
}
.navbar.scrolled .nav-cta {
    background: var(--primary) !important;
    color: var(--white) !important;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-light);
}

.logo-text {
    font-family: var(--font-en);
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--white);
    letter-spacing: -0.02em;
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    border-radius: var(--radius-xl);
    transition: var(--transition);
}
.nav-link:hover {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

.nav-cta {
    background: rgba(255,255,255,0.15) !important;
    color: var(--white) !important;
    border: 1px solid rgba(255,255,255,0.3);
}
.nav-cta:hover {
    background: rgba(255,255,255,0.25) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}
.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
    border-radius: 2px;
}
.navbar.scrolled .nav-toggle span {
    background: var(--gray-800);
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--green-950) 0%, var(--green-800) 40%, var(--primary) 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.leaf {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 60% 40% 70% 30% / 50% 60% 40% 50%;
    opacity: 0.08;
}

.leaf-1 {
    background: var(--green-400);
    top: -80px;
    right: -60px;
    width: 500px;
    height: 500px;
    animation: float1 20s ease-in-out infinite;
}
.leaf-2 {
    background: var(--green-300);
    bottom: -100px;
    left: -80px;
    width: 400px;
    height: 400px;
    animation: float2 25s ease-in-out infinite;
}
.leaf-3 {
    background: var(--primary-light);
    top: 30%;
    right: 10%;
    width: 200px;
    height: 200px;
    opacity: 0.05;
    animation: float3 18s ease-in-out infinite;
}
.leaf-4 {
    background: var(--green-200);
    top: 10%;
    left: 20%;
    width: 150px;
    height: 150px;
    opacity: 0.06;
    animation: float1 22s ease-in-out infinite reverse;
}
.leaf-5 {
    background: var(--accent);
    bottom: 20%;
    right: 25%;
    width: 120px;
    height: 120px;
    opacity: 0.04;
    animation: float2 15s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(5deg); }
    66% { transform: translate(-20px, 20px) rotate(-3deg); }
}
@keyframes float2 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-40px, -20px) rotate(-5deg); }
}
@keyframes float3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -30px) scale(1.1); }
}

.hero-content {
    text-align: center;
    color: var(--white);
    position: relative;
    z-index: 2;
    padding: 0 24px;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    margin-bottom: 32px;
    backdrop-filter: blur(10px);
}

.hero-icon {
    display: block;
    font-size: 3rem;
    margin-bottom: 8px;
    color: var(--green-400);
}

.hero-title-en {
    display: block;
    font-family: var(--font-en);
    font-size: clamp(3.5rem, 10vw, 7rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 0.95;
    margin-bottom: 4px;
}

.hero-title-zh {
    display: block;
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: 0.15em;
    line-height: 1.3;
    color: var(--green-300);
}

.hero-title-en2 {
    display: block;
    font-family: var(--font-en);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: 0.08em;
    line-height: 1.2;
    opacity: 0.9;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    margin-top: 24px;
    opacity: 0.8;
    line-height: 2;
    letter-spacing: 0.2em;
    font-weight: 300;
}

.hero-actions {
    margin-top: 40px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.4);
    font-family: var(--font-en);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    font-weight: 500;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.3); }
}

/* --- Section Styles --- */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    font-family: var(--font-en);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: 0.02em;
}

.section-header.light .section-label {
    color: var(--green-300);
}
.section-header.light h2 {
    color: var(--white);
}

.section-divider {
    width: 60px;
    height: 3px;
    background: var(--primary);
    margin: 16px auto 0;
    border-radius: 3px;
}

.section-header.light .section-divider {
    background: var(--green-400);
}

/* --- About Section --- */
.about {
    background: var(--gray-50);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-lead {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-content p {
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 48px;
    box-shadow: var(--shadow-xl);
    text-align: center;
    border: 1px solid var(--green-100);
}

.about-card-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.about-card h3 {
    font-family: var(--font-en);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 12px;
}

.about-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* --- Opportunity Section --- */
.opportunity {
    background: linear-gradient(135deg, var(--green-900) 0%, var(--green-800) 100%);
    color: var(--white);
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.opportunity-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.opp-lead {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--green-300);
}

.opp-text p {
    color: rgba(255,255,255,0.8);
    line-height: 1.9;
}

.opp-highlight {
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 40px;
    border: 1px solid rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
}

.opp-highlight h3 {
    font-size: 1.4rem;
    margin-bottom: 16px;
    color: var(--green-300);
}

.opp-highlight p {
    color: rgba(255,255,255,0.8);
    line-height: 1.8;
}

/* --- Vision Section --- */
.vision {
    background: var(--white);
    padding: 120px 0;
}

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

.vision-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.vision h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 32px;
}

.vision-statement {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--gray-800);
    line-height: 2;
    letter-spacing: 0.02em;
}

.vision-en {
    margin-top: 24px;
    font-family: var(--font-en);
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.8;
    font-style: italic;
}

/* --- Pillars Section --- */
.pillars {
    background: var(--gray-50);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.pillar-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid var(--gray-200);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.pillar-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--green-400));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.pillar-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--green-200);
}
.pillar-card:hover::before {
    transform: scaleX(1);
}

.pillar-number {
    font-family: var(--font-en);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--gray-300);
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.pillar-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.pillar-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.pillar-card > p {
    font-family: var(--font-en);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
}

.pillar-desc {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}

/* --- Strategy Section --- */
.strategy {
    background: linear-gradient(135deg, var(--green-800) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.strategy-bg {
    opacity: 0.5;
}

.strategy-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.strategy-card {
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
}

.strategy-card:hover {
    background: rgba(255,255,255,0.12);
    transform: translateY(-2px);
}

.strategy-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--primary-light);
    color: var(--white);
    border-radius: 50%;
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.strategy-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.strategy-card p {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* --- Action Plan Section --- */
.action-plan {
    background: var(--white);
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.action-item {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: 36px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

.action-item:hover {
    border-color: var(--green-300);
    box-shadow: var(--shadow-md);
}

.action-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.action-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-width: 40px;
    background: linear-gradient(135deg, var(--primary), var(--green-600));
    color: var(--white);
    border-radius: var(--radius-sm);
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 0.85rem;
}

.action-item h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--gray-900);
}

.action-item ul {
    padding-left: 0;
}

.action-item li {
    padding: 6px 0 6px 24px;
    color: var(--gray-600);
    font-size: 0.9rem;
    position: relative;
    line-height: 1.6;
}

.action-item li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green-400);
}

/* --- Partners Section --- */
.partners {
    background: var(--gray-50);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.partner-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 24px;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: all 0.4s ease;
}

.partner-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--green-200);
}

.partner-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.partner-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.partner-card p {
    font-size: 0.8rem;
    color: var(--gray-500);
    line-height: 1.5;
}

/* --- CTA Section --- */
.cta-section {
    background: linear-gradient(135deg, var(--green-900) 0%, var(--primary) 50%, var(--green-800) 100%);
    color: var(--white);
    padding: 120px 0;
}

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

.cta-wrapper h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.cta-wrapper > p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 36px;
    line-height: 1.8;
}

.cta-actions {
    margin-bottom: 40px;
}

.cta-actions .btn-primary {
    background: var(--white);
    color: var(--primary-dark);
    border-color: var(--white);
}
.cta-actions .btn-primary:hover {
    background: var(--green-100);
    border-color: var(--green-100);
}

.cta-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.cta-info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
}

/* --- Footer --- */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 64px 0 32px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand > p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.footer-links h4 {
    color: var(--white);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    padding: 4px 0;
    font-size: 0.85rem;
    color: var(--gray-500);
}
.footer-links a:hover {
    color: var(--green-400);
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--gray-600);
}

/* --- Animation Classes --- */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate="fade-right"] {
    transform: translateX(-30px);
}

[data-animate="fade-left"] {
    transform: translateX(30px);
}

[data-animate].animated {
    opacity: 1;
    transform: translate(0, 0);
}

/* --- Language Switcher --- */
.lang-switcher {
    position: relative;
    z-index: 1001;
    margin-left: 8px;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-xl);
    color: rgba(255,255,255,0.9);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-zh);
}

.lang-btn:hover {
    background: rgba(255,255,255,0.2);
}

.navbar.scrolled .lang-btn {
    background: var(--gray-100);
    border-color: var(--gray-200);
    color: var(--gray-700);
}

.lang-icon {
    font-size: 1rem;
}

.lang-arrow {
    font-size: 0.65rem;
    transition: transform 0.2s ease;
}

.lang-switcher.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 150px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-200);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
    overflow: hidden;
}

.lang-switcher.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 10px 16px;
    border: none;
    background: none;
    text-align: left;
    font-size: 0.85rem;
    font-family: var(--font-zh);
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
}

.lang-option:hover {
    background: var(--green-50);
    color: var(--primary);
}

.lang-option.active {
    background: var(--green-50);
    color: var(--primary);
    font-weight: 600;
}

/* --- Journey Section --- */
.journey {
    background: linear-gradient(135deg, var(--green-900) 0%, var(--green-800) 50%, var(--primary-dark) 100%);
    color: var(--white);
    overflow: hidden;
}

.journey-subtitle {
    text-align: center;
    max-width: 600px;
    margin: -32px auto 56px;
    color: rgba(255,255,255,0.75);
    font-size: 1.05rem;
    line-height: 1.8;
}

.journey-road {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.journey-line {
    position: absolute;
    top: 48px;
    left: 10%;
    right: 10%;
    height: 3px;
    background: linear-gradient(90deg, var(--green-400), var(--primary-light), var(--accent));
    border-radius: 3px;
    z-index: 0;
}

.journey-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.journey-icon {
    width: 96px;
    height: 96px;
    margin: 0 auto 20px;
    background: rgba(255,255,255,0.1);
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
}

.journey-step:hover .journey-icon {
    background: rgba(255,255,255,0.18);
    border-color: var(--green-400);
    transform: scale(1.08);
}

.journey-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--green-300);
}

.journey-content p {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.7;
    max-width: 280px;
    margin: 0 auto;
}

.journey-tag {
    display: inline-block;
    margin-top: 16px;
    padding: 4px 14px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--green-300);
}

/* --- Video Embed --- */
.air-video {
    margin-top: 56px;
    text-align: center;
}

.air-video h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--green-300);
}

.air-video-desc {
    max-width: 700px;
    margin: 0 auto 28px;
    color: rgba(255,255,255,0.75);
    font-size: 0.95rem;
    line-height: 1.7;
}

.video-embed {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    aspect-ratio: 16/9;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .pillars-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .journey-road {
        gap: 24px;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 100px 32px 32px;
        gap: 4px;
        transition: right 0.4s ease;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    }

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

    .nav-menu .nav-link {
        color: var(--gray-700);
        font-size: 1rem;
        padding: 12px 16px;
        width: 100%;
    }
    .nav-menu .nav-link:hover {
        background: var(--green-50);
        color: var(--primary);
    }

    .nav-menu .nav-cta {
        background: var(--primary) !important;
        color: var(--white) !important;
        text-align: center;
        border: none;
        margin-top: 16px;
    }

    .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);
    }

    .section {
        padding: 64px 0;
    }

    .about-grid,
    .opportunity-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

    .strategy-grid,
    .action-grid {
        grid-template-columns: 1fr;
    }

    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-scroll {
        display: none;
    }

    .journey-road {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .journey-line {
        display: none;
    }

    .lang-switcher {
        margin-left: 0;
        margin-right: 8px;
    }

    .vision {
        padding: 80px 0;
    }

    .cta-section {
        padding: 80px 0;
    }

    .cta-wrapper h2 {
        font-size: 2rem;
    }
}

/* --- AIR Project Section --- */
.air-project {
    background: linear-gradient(135deg, var(--green-950) 0%, var(--green-800) 50%, var(--primary-dark) 100%);
    color: var(--white);
    overflow: hidden;
}

.air-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
}

.air-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-xl);
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.air-info h3 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 16px;
    font-family: var(--font-en);
}

.air-desc {
    color: rgba(255,255,255,0.8);
    line-height: 1.8;
    margin-bottom: 28px;
    font-size: 1.05rem;
}

.air-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 32px;
}

.air-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.08);
}

.air-feature-icon {
    font-size: 1.2rem;
}

.air-card-stack {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.air-stat-card {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.air-stat-card:hover {
    background: rgba(255,255,255,0.12);
    transform: translateX(4px);
}

.air-stat-icon {
    font-size: 1.5rem;
}

.air-stat-label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.6);
}

.air-stat-value {
    font-size: 1.1rem;
    font-weight: 700;
    margin-left: auto;
    color: var(--green-300);
}

/* --- Donate Section --- */
.donate-section {
    background: var(--gray-50);
}

.donate-intro {
    text-align: center;
    max-width: 700px;
    margin: -32px auto 48px;
    color: var(--gray-600);
    line-height: 1.8;
}

.donate-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 48px;
}

.donate-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
}

.donate-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.donate-card-header {
    background: linear-gradient(135deg, var(--primary), var(--green-600));
    color: var(--white);
    padding: 28px 32px;
    text-align: center;
}

.donate-card-crypto .donate-card-header {
    background: linear-gradient(135deg, #f7931a, #e8a838);
}

.donate-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 8px;
}

.donate-card-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.donate-card-header p {
    font-size: 0.85rem;
    opacity: 0.85;
}

.donate-card-body {
    padding: 28px 32px;
}

.donate-amounts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.amount-btn {
    padding: 12px 8px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: var(--white);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-zh);
}

.amount-btn:hover,
.amount-btn.active {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--green-50);
}

.donate-custom {
    margin-bottom: 20px;
}

.donate-custom label {
    display: block;
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-bottom: 6px;
}

.donate-custom input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font-zh);
    transition: var(--transition);
    outline: none;
}

.donate-custom input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--green-100);
}

.btn-block {
    width: 100%;
    margin-bottom: 12px;
}

.donate-secure, .crypto-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--gray-500);
}

.crypto-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.crypto-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: var(--white);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-en);
    font-size: 0.95rem;
}

.crypto-btn:hover,
.crypto-btn.active {
    border-color: #f7931a;
    background: #fffbf5;
}

.crypto-symbol {
    font-size: 1.3rem;
    font-weight: 700;
    width: 32px;
    text-align: center;
}

.crypto-tag {
    margin-left: auto;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--gray-500);
    background: var(--gray-100);
    padding: 2px 8px;
    border-radius: 4px;
}

.crypto-wallet {
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-bottom: 16px;
    text-align: center;
}

.wallet-qr {
    width: 120px;
    height: 120px;
    margin: 0 auto 12px;
    background: var(--white);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--gray-200);
}

.qr-placeholder {
    font-size: 0.8rem;
    color: var(--gray-400);
    font-weight: 500;
}

.wallet-label {
    font-size: 0.75rem;
    color: var(--gray-500);
    display: block;
    margin-bottom: 6px;
}

.wallet-copy {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
}

.wallet-copy code {
    font-size: 0.7rem;
    color: var(--gray-600);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.copy-btn {
    padding: 4px 12px;
    border: 1px solid var(--gray-200);
    border-radius: 4px;
    background: var(--white);
    font-size: 0.75rem;
    cursor: pointer;
    color: var(--primary);
    font-weight: 600;
    transition: var(--transition);
    font-family: var(--font-zh);
    white-space: nowrap;
}

.copy-btn:hover {
    background: var(--green-50);
    border-color: var(--primary);
}

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

.donate-transparency h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 24px;
}

.transparency-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.transparency-item {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--gray-200);
}

.transparency-item span {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 10px;
}

.transparency-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.transparency-item p {
    font-size: 0.8rem;
    color: var(--gray-500);
}

/* --- PWA Install Banner --- */
.pwa-banner {
    position: fixed;
    bottom: -100px;
    left: 0;
    right: 0;
    z-index: 999;
    transition: bottom 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.pwa-banner.visible {
    bottom: 0;
}

.pwa-banner-content {
    max-width: 600px;
    margin: 0 auto 16px;
    padding: 16px 20px;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 14px;
    border: 1px solid var(--gray-200);
    margin-left: 16px;
    margin-right: 16px;
}

.pwa-banner-icon {
    font-size: 1.5rem;
    color: var(--primary);
    min-width: 32px;
    text-align: center;
}

.pwa-banner-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.pwa-banner-text strong {
    font-size: 0.9rem;
    color: var(--gray-900);
}

.pwa-banner-text span {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.85rem;
}

.pwa-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-400);
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

.pwa-close:hover {
    color: var(--gray-600);
}

/* --- Responsive additions --- */
@media (max-width: 768px) {
    .air-content {
        grid-template-columns: 1fr;
    }

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

    .donate-amounts {
        grid-template-columns: repeat(2, 1fr);
    }

    .transparency-features {
        grid-template-columns: repeat(2, 1fr);
    }

    .air-features {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title-en {
        font-size: 3rem;
    }

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

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .transparency-features {
        grid-template-columns: 1fr;
    }

    .donate-amounts {
        grid-template-columns: repeat(2, 1fr);
    }
}