:root {
    /* 颜色变量 - 深色科技感主题 */
    --bg-color: #050510;
    --text-color: #ffffff;
    --text-secondary: #a1a1aa;
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --accent-color: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-highlight: rgba(255, 255, 255, 0.2);

    /* 字体变量 */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* 粒子背景Canvas */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.15), transparent 40%),
        radial-gradient(circle at bottom left, rgba(236, 72, 153, 0.1), transparent 40%);
    z-index: 1;
    pointer-events: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
    position: relative;
    z-index: 10;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* 头部样式 */
.header {
    padding: var(--spacing-md) 0;
    width: 100%;
    display: flex;
    justify-content: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    height: 48px;
    width: auto;
}

.logo-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.02em;
}

.badge {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.05em;
    margin-top: 4px;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Hero区域 */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg) 0;
    width: 100%;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

.gradient-text {
    background: linear-gradient(135deg, var(--text-color) 0%, var(--primary-color) 50%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.6;
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

/* 倒计时样式 */
.countdown-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(99, 102, 241, 0.15);
    border-color: var(--glass-highlight);
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
}

.countdown-number {
    font-size: 2.5rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    margin-bottom: 0.25rem;
    background: linear-gradient(to bottom, #fff, #cbd5e1);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.countdown-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.countdown-separator {
    font-size: 2rem;
    font-weight: 300;
    color: var(--glass-highlight);
    margin-top: -1.5rem;
}

@media (max-width: 640px) {
    .countdown-container {
        padding: var(--spacing-sm);
        gap: 0.25rem;
    }

    .countdown-item {
        min-width: 50px;
    }

    .countdown-number {
        font-size: 1.75rem;
    }

    .countdown-label {
        font-size: 0.65rem;
    }

    .countdown-separator {
        font-size: 1.5rem;
        margin-top: -1rem;
    }
}

/* 订阅及表单样式 */
.subscribe-section {
    width: 100%;
    max-width: 450px;
}

.subscribe-text {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.subscribe-form {
    position: relative;
}

.input-group {
    display: flex;
    position: relative;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 4px;
    transition: border-color 0.3s ease, background 0.3s ease;
}

.input-group:focus-within {
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

input[type="email"] {
    flex: 1;
    background: transparent;
    border: none;
    padding: 12px 16px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    outline: none;
}

input[type="email"]::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.btn-primary:active {
    transform: scale(0.98);
}

.form-message {
    margin-top: 10px;
    font-size: 0.875rem;
    min-height: 20px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-message.success {
    color: #10b981;
    opacity: 1;
}

.form-message.error {
    color: #ef4444;
    opacity: 1;
}

@media (max-width: 480px) {
    .input-group {
        flex-direction: column;
        padding: 12px;
        gap: 12px;
        background: transparent;
        border: none;
    }

    input[type="email"] {
        width: 100%;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid var(--glass-border);
        border-radius: 8px;
    }

    .btn-primary {
        width: 100%;
        justify-content: center;
    }
}

/* 页脚样式 */
.footer {
    padding: var(--spacing-md) 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    color: var(--text-secondary);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    padding: 10px;
    border-radius: 50%;
    border: 1px solid transparent;
}

.social-link:hover {
    color: white;
    background: var(--glass-highlight);
    border-color: var(--glass-border);
    transform: translateY(-3px);
}

.copyright {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.875rem;
}

/* 动画类 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 1s ease-out forwards;
}

.fade-in-up {
    animation: fadeInUp 1s ease-out 0.3s forwards;
    opacity: 0;
}
/* QQ Group Styles - Appended */
.qq-group {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 10px 20px;
  border-radius: 50px;
  color: var(--text-color);
  font-weight: 500;
  transition: all 0.3s ease;
  backdrop-filter: blur(5px);
}

.qq-group:hover {
  background: var(--glass-highlight);
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.qq-group svg {
  color: var(--primary-color);
}