/* API Wallet Website Style */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
    --bg-color: #0b0c10;
    --card-bg: rgba(22, 24, 33, 0.7);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.15);
    --accent: #14b8a6;
    --accent-glow: rgba(20, 184, 166, 0.15);
    --danger: #ef4444;
    --success: #10b981;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: 'Outfit', var(--font-sans);
    --max-width: 1100px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Background Gradients */
body::before {
    content: '';
    position: absolute;
    top: -10%;
    left: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

body::after {
    content: '';
    position: absolute;
    bottom: -10%;
    right: -10%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(20, 184, 166, 0.06) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

/* Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--card-border);
    background: rgba(11, 12, 16, 0.7);
    padding: 1rem 2rem;
    transition: var(--transition);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.4rem;
}

.logo svg {
    width: 32px;
    height: 32px;
    fill: var(--primary);
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.logo-text span {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.lang-switch {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2px;
    position: relative;
    cursor: pointer;
}

.lang-btn {
    border: none;
    background: transparent;
    color: var(--text-secondary);
    padding: 6px 14px;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 18px;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Containers */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Language Content Display */
[lang="zh"] .lang-en-only,
[lang="en"] .lang-zh-only {
    display: none !important;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 6rem 2rem 4rem;
    position: relative;
}

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-glow);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--primary-light);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -0.5px;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--primary-light) 30%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 20px var(--primary-glow);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Features Section */
.section-title {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-title h2 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.section-title p {
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.05) 0%, transparent 100%);
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-glow);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--primary-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

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

/* Info Cards / Columns */
.info-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    .info-section {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

.info-content h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.info-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.info-list {
    list-style: none;
}

.info-list li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.info-list li svg {
    width: 20px;
    height: 20px;
    color: var(--accent);
    margin-top: 2px;
    flex-shrink: 0;
}

.info-list li strong {
    color: var(--text-primary);
}

.security-badge {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1), rgba(99, 102, 241, 0.1));
    border: 1px solid rgba(20, 184, 166, 0.2);
    border-radius: 24px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
}

.badge-icon {
    width: 64px;
    height: 64px;
    background: rgba(20, 184, 166, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--accent);
}

.badge-icon svg {
    width: 32px;
    height: 32px;
}

/* Support Form & FAQ */
.support-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 4rem;
}

@media (max-width: 900px) {
    .support-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

.faq-section h2, .contact-section h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-question {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    user-select: none;
    font-size: 1.05rem;
}

.faq-question svg {
    width: 18px;
    height: 18px;
    transition: transform 0.3s;
    color: var(--text-secondary);
}

.faq-answer {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: none;
}

.faq-item.active {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(22, 24, 33, 0.9);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
    color: var(--primary-light);
}

.faq-item.active .faq-answer {
    display: block;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-align: center;
    height: fit-content;
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-glow);
    color: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.contact-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.contact-email {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    padding: 10px 15px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.btn-copy {
    border: none;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Policy Content Details */
.policy-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 3.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
    .policy-container {
        padding: 2rem 1.5rem;
    }
}

.policy-header {
    text-align: center;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 2rem;
}

.policy-header h1 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.policy-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.policy-section {
    margin-bottom: 2.5rem;
}

.policy-section h2 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.policy-section h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1.2rem;
    background: var(--primary);
    border-radius: 2px;
}

.policy-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
    text-align: justify;
}

.policy-section ul {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    font-size: 0.95rem;
}

.policy-section li {
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--card-border);
    padding: 3rem 2rem;
    background: rgba(11, 12, 16, 0.9);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

@media (max-width: 600px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}

.footer-info {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-company {
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* Notification Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: rgba(22, 24, 33, 0.95);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast svg {
    color: var(--accent);
    width: 20px;
    height: 20px;
}