:root {
    --primary: #07c160;
    --primary-dark: #06ad56;
    --bg-dark: #0a0a0f;
    --bg-surface: #12121a;
    --bg-card: #1a1a24;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6a6a7a;
    --border: rgba(255, 255, 255, 0.08);
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

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

/* Header */
.header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), #00d4aa);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: var(--transition);
}

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

/* Hero */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(7, 193, 96, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 24px;
    line-height: 1.2;
    position: relative;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--primary), #00d4aa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    position: relative;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(7, 193, 96, 0.3);
}

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

.btn-secondary:hover {
    background: var(--bg-surface);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn-wechat {
    background: var(--primary);
    color: white;
    font-size: 18px;
    padding: 18px 48px;
}

.btn-wechat:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(7, 193, 96, 0.4);
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.glass-card {
    background: rgba(26, 26, 36, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
}

/* Features */
.features {
    padding: 80px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(7, 193, 96, 0.3);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(7, 193, 96, 0.2), rgba(0, 212, 170, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    text-align: center;
}

.login-card h1 {
    font-size: 32px;
    margin-bottom: 12px;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.login-divider {
    display: flex;
    align-items: center;
    margin: 32px 0;
    color: var(--text-muted);
    font-size: 14px;
}

.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.login-divider span {
    padding: 0 16px;
}

/* Callback Page */
.callback-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.callback-card {
    width: 100%;
    max-width: 500px;
    text-align: center;
}

.callback-card h1 {
    font-size: 28px;
    margin-bottom: 24px;
}

.status-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.status-success {
    color: var(--primary);
}

.status-success .icon {
    width: 64px;
    height: 64px;
    background: rgba(7, 193, 96, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
}

.status-error {
    color: #ff6b6b;
}

.user-info {
    background: var(--bg-surface);
    border-radius: var(--radius);
    padding: 24px;
    margin-top: 24px;
    text-align: left;
}

.user-info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.user-info-row:last-child {
    border-bottom: none;
}

.user-info-label {
    color: var(--text-muted);
    font-size: 14px;
}

.user-info-value {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    color: var(--text-secondary);
    word-break: break-all;
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Powered by badge */
.powered-by {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 32px;
}

.powered-by a {
    color: var(--primary);
    font-weight: 600;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 16px;
    }

    .nav-links {
        display: none;
    }
}