/**
 * TSH48 第9期生招募 - 样式表
 *
 * 品牌色：主色 #E60012（红色），辅色 #FFFFFF（白色），点缀 #FFD700（金色）
 * 使用系统字体，无外部 CDN 依赖。
 */

/* ===== 基础重置 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #E60012;
    --color-primary-dark: #B8000E;
    --color-primary-light: #ff3b3b;
    --color-white: #FFFFFF;
    --color-gold: #FFD700;
    --color-dark: #1a1a1a;
    --color-gray: #666666;
    --color-light-gray: #f5f5f5;
    --max-width: 1200px;
    --header-height: 64px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
        "PingFang SC", "Hiragino Sans GB", sans-serif;
    color: var(--color-dark);
    background: var(--color-white);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ===== 顶部导航栏 ===== */
.site-header {
    background: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-bar {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    height: var(--header-height);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-size: 1.75rem;
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: 1px;
    border: 2px solid var(--color-gold);
    border-radius: 6px;
    padding: 2px 10px;
    line-height: 1.2;
    white-space: nowrap;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: 1px;
}

/* ===== 倒计时区域 ===== */
.countdown-section {
    background: linear-gradient(135deg, #1a0000 0%, #2b0000 50%, #400000 100%);
    padding: 3rem 1.5rem;
    text-align: center;
}

.countdown-label {
    color: var(--color-gold);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.75rem;
    letter-spacing: 3px;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.time-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 215, 0, 0.25);
    border-radius: 14px;
    padding: 1.25rem 1.5rem;
    min-width: 110px;
}

.time-number {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-white);
    line-height: 1;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
}

.time-text {
    margin-top: 0.6rem;
    font-size: 0.95rem;
    color: var(--color-gold);
    letter-spacing: 2px;
}

.countdown-ended {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gold);
    letter-spacing: 4px;
    padding: 1rem 0;
}

/* ===== 主视觉区域 ===== */
.hero-section {
    background:
        radial-gradient(circle at 30% 40%, rgba(255, 215, 0, 0.18) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.12) 0%, transparent 45%),
        linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
    padding: 5rem 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: var(--color-gold);
    color: var(--color-primary-dark);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 6px 18px;
    border-radius: 20px;
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.hero-slogan {
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: 6px;
    line-height: 1.3;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.25);
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 4px;
    font-weight: 400;
}

/* ===== 报名按钮区域 ===== */
.register-section {
    background: var(--color-light-gray);
    padding: 3.5rem 1.5rem;
    text-align: center;
}

.register-btn {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 4px;
    padding: 1.1rem 4rem;
    border-radius: 50px;
    border: none;
    box-shadow: 0 6px 20px rgba(230, 0, 18, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    cursor: pointer;
}

.register-btn:hover,
.register-btn:focus {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(230, 0, 18, 0.45);
    outline: none;
}

.register-btn:active {
    transform: translateY(-1px);
}

/* 报名按钮禁用状态（招募已结束） */
.register-btn.is-disabled {
    background: #aaaaaa;
    color: #dddddd;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
    pointer-events: none;
}

/* ===== 底部信息 ===== */
.site-footer {
    background: var(--color-dark);
    color: #cccccc;
    padding: 3rem 1.5rem 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
}

.footer-title {
    font-size: 1.2rem;
    color: var(--color-gold);
    margin-bottom: 1.25rem;
    letter-spacing: 2px;
}

.footer-list {
    display: inline-block;
    text-align: left;
    margin-bottom: 2rem;
}

.footer-list li {
    font-size: 0.95rem;
    line-height: 2.2;
    color: #bbbbbb;
}

.copyright {
    border-top: 1px solid #333333;
    padding-top: 1.5rem;
    font-size: 0.85rem;
    color: #888888;
    letter-spacing: 1px;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
    .nav-bar {
        height: 56px;
        gap: 0.6rem;
        padding: 0 1rem;
    }

    .logo {
        font-size: 1.4rem;
        padding: 2px 8px;
    }

    .site-title {
        font-size: 1rem;
    }

    .countdown-section {
        padding: 2.5rem 1rem;
    }

    .countdown-label {
        font-size: 1.05rem;
        letter-spacing: 2px;
    }

    .countdown-timer {
        gap: 0.75rem;
    }

    .time-unit {
        min-width: 70px;
        padding: 0.9rem 0.8rem;
    }

    .time-number {
        font-size: 2.5rem;
    }

    .time-text {
        font-size: 0.8rem;
    }

    .countdown-ended {
        font-size: 1.4rem;
    }

    .hero-section {
        padding: 3.5rem 1rem;
    }

    .hero-slogan {
        font-size: 2rem;
        letter-spacing: 3px;
    }

    .hero-subtitle {
        font-size: 1.1rem;
        letter-spacing: 2px;
    }

    .register-section {
        padding: 2.5rem 1rem;
    }

    .register-btn {
        font-size: 1.25rem;
        padding: 0.9rem 2.5rem;
        letter-spacing: 3px;
    }
}

@media (max-width: 420px) {
    .time-unit {
        min-width: 60px;
        padding: 0.7rem 0.5rem;
    }

    .time-number {
        font-size: 2rem;
    }

    .countdown-timer {
        gap: 0.5rem;
    }

    .hero-slogan {
        font-size: 1.6rem;
    }
}