/* ==================== 全局样式 ==================== */
:root {
    --deep-blue: #0a1628;
    --navy: #0f2137;
    --blue: #1a3a5c;
    --accent: #4da8da;
    --accent-light: #7ec8f8;
    --gold: #d4a853;
    --bg: #f0f4f8;
    --card: #ffffff;
    --text: #1a2332;
    --muted: #5a6c7d;
    --border: #d0dce8;
    --shadow: 0 4px 24px rgba(10, 22, 40, 0.08);
    --shadow-hover: 0 12px 36px rgba(10, 22, 40, 0.14);
    --radius: 14px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --red: #e74c3c;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }

/* ==================== 导航栏 ==================== */
.nav-bar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(15, 33, 55, 0.94);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 2rem; height: 60px; transition: var(--transition);
}
.nav-bar.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
.nav-logo {
    font-size: 1.3rem; font-weight: 700; color: #fff;
    letter-spacing: 0.06em; display: flex; align-items: center; gap: 0.5rem;
}
.nav-logo .ball-dot {
    width: 10px; height: 10px; background: var(--accent); border-radius: 50%;
    box-shadow: 0 0 12px var(--accent-light);
    animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%,100% { box-shadow: 0 0 8px var(--accent-light); }
    50% { box-shadow: 0 0 20px var(--accent-light), 0 0 36px var(--accent); }
}
.nav-links { display: flex; align-items: center; gap: 0.3rem; list-style: none; }
.nav-links a {
    color: rgba(255,255,255,0.78); padding: 0.5rem 1rem; border-radius: 8px;
    font-size: 0.9rem; font-weight: 500; letter-spacing: 0.03em; transition: var(--transition);
    position: relative;
}
.nav-links a:hover, .nav-links a.active { color: #fff; background: rgba(77,168,218,0.15); }
.nav-links a.active::after {
    content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
    width: 20px; height: 2px; background: var(--accent); border-radius: 1px;
}
.nav-auth { display: flex; align-items: center; gap: 0.6rem; }
.btn-nav {
    padding: 0.45rem 1.2rem; border-radius: 20px; font-size: 0.85rem;
    font-weight: 600; letter-spacing: 0.04em; cursor: pointer; border: none; transition: var(--transition);
}
.btn-nav-outline { background: transparent; border: 1.5px solid rgba(255,255,255,0.35); color: #fff; }
.btn-nav-outline:hover { border-color: var(--accent); background: rgba(77,168,218,0.1); }
.btn-nav-solid { background: var(--accent); color: #fff; border: 1.5px solid var(--accent); }
.btn-nav-solid:hover { background: var(--accent-light); border-color: var(--accent-light); box-shadow: 0 4px 18px rgba(77,168,218,0.35); }

/* 用户头像区 */
.user-info { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; position: relative; }
.user-avatar {
    width: 34px; height: 34px; border-radius: 50%; background: var(--accent);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 700; font-size: 0.9rem; letter-spacing: 0.05em;
}
.user-nickname-wrap { display: flex; align-items: center; gap: 0.35rem; }
.user-nickname { color: #fff; font-size: 0.85rem; font-weight: 500; max-width: 80px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.su-badge {
    background: #e74c3c; color: #fff; font-size: 0.6rem; font-weight: 800;
    padding: 0.15rem 0.35rem; border-radius: 4px; letter-spacing: 0.05em; line-height: 1;
}
.user-dropdown {
    position: absolute; top: 110%; right: 0; background: #fff; border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2); padding: 0.5rem 0; min-width: 140px;
    display: none; flex-direction: column; z-index: 10;
}
.user-dropdown.show { display: flex; }
.user-dropdown button, .user-dropdown a {
    background: none; border: none; padding: 0.6rem 1.2rem; text-align: left;
    font-size: 0.85rem; color: var(--text); cursor: pointer; transition: 0.2s;
    display: block; width: 100%; text-decoration: none;
}
.user-dropdown button:hover, .user-dropdown a:hover { background: #f0f4f8; }
.user-dropdown .logout-btn:hover { color: #c0392b; }
.user-dropdown .admin-btn { color: var(--accent); font-weight: 600; }
.user-dropdown .admin-btn:hover { background: #eef6fb; }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }

/* ==================== 开场动画层 ==================== */
.intro-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(160deg, #0a1628 0%, #0f2137 50%, #162d48 100%);
    z-index: 9999; display: flex; flex-direction: column; align-items: center; justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}
.intro-overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.intro-big-text {
    font-size: 5rem; font-weight: 900; color: #fff; letter-spacing: 0.15em;
    text-shadow: 0 0 60px rgba(77,168,218,0.6), 0 0 120px rgba(77,168,218,0.3);
    animation: introPop 1s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0; transform: scale(0.3);
}
@keyframes introPop {
    0% { opacity: 0; transform: scale(0.3); }
    60% { opacity: 1; transform: scale(1.08); }
    100% { opacity: 1; transform: scale(1); }
}
.intro-sub {
    font-size: 1.2rem; color: #7ec8f8; letter-spacing: 0.2em; margin-top: 1.5rem;
    animation: fadeUp 0.8s 0.6s ease forwards; opacity: 0;
}
@keyframes fadeUp { from { opacity:0; transform: translateY(20px); } to { opacity:1; transform: translateY(0); } }
.intro-balls { display: flex; gap: 2rem; margin-top: 2.5rem; }
.intro-ball {
    width: 18px; height: 18px; background: #fff; border-radius: 50%;
    box-shadow: 0 0 20px rgba(255,255,255,0.5);
    animation: floatBall 1.5s ease-in-out infinite;
}
.intro-ball:nth-child(1) { animation-delay: 0s; }
.intro-ball:nth-child(2) { animation-delay: 0.3s; }
.intro-ball:nth-child(3) { animation-delay: 0.6s; }
@keyframes floatBall { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
.intro-hint { position: absolute; bottom: 2.5rem; color: rgba(255,255,255,0.45); font-size: 0.85rem; letter-spacing: 0.1em; animation: fadeUp 0.8s 1.2s ease forwards; opacity: 0; cursor: pointer; }

/* ==================== 首页特有 ==================== */
.hero-home {
    background: linear-gradient(160deg, #0a1628 0%, #0f2137 50%, #1a3a5c 100%);
    color: #fff; text-align: center; padding: 5rem 2rem 4rem;
}
.hero-home h1 { font-size: 3rem; font-weight: 900; letter-spacing: 0.1em; animation: fadeSlideIn 0.8s ease; }
.hero-home .accent-text { color: #7ec8f8; }
.hero-home p { color: rgba(255,255,255,0.7); font-size: 1.1rem; margin-top: 0.8rem; letter-spacing: 0.06em; }
.scroll-indicator { margin-top: 2.5rem; animation: bounceDown 2s ease infinite; font-size: 2rem; color: rgba(255,255,255,0.5); }
@keyframes bounceDown { 0%,100% { transform: translateY(0); } 50% { transform: translateY(12px); } }

/* ==================== 页面容器 ==================== */
.page-container { max-width: 1000px; margin: 0 auto; padding: 100px 1.5rem 3rem; animation: fadeSlideIn 0.5s ease; }
@keyframes fadeSlideIn { from { opacity:0; transform: translateY(20px); } to { opacity:1; transform: translateY(0); } }
.section-title {
    font-size: 1.5rem; font-weight: 700; color: var(--navy); letter-spacing: 0.04em;
    margin-bottom: 1.5rem; padding-bottom: 0.6rem; border-bottom: 3px solid var(--accent); display: inline-block;
}

/* ==================== 卡片 ==================== */
.card {
    background: var(--card); border-radius: var(--radius); padding: 1.6rem;
    box-shadow: var(--shadow); border: 1px solid var(--border); transition: var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 1.5rem; margin-bottom: 2.5rem; }

/* ==================== 公告列表 ==================== */
.notice-item {
    background: #fff; border-radius: var(--radius); padding: 1.2rem 1.5rem;
    margin-bottom: 1rem; box-shadow: var(--shadow); border: 1px solid var(--border);
    display: flex; align-items: center; gap: 1rem; cursor: pointer;
    transition: var(--transition);
}
.notice-item:hover { transform: translateX(4px); box-shadow: var(--shadow-hover); border-left: 4px solid var(--accent); }

/* 弹窗 */
.modal-overlay {
    position: fixed; top:0; left:0; width:100%; height:100%; background: rgba(0,0,0,0.55);
    z-index: 2000; display: flex; align-items: center; justify-content: center;
    animation: fadeIn 0.25s ease;
}
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
.modal-content {
    background: #fff; border-radius: 16px; padding: 2rem 2rem 1.5rem;
    max-width: 750px; width: 90%; max-height: 85vh; overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3); animation: modalIn 0.3s ease;
}
@keyframes modalIn { from { opacity:0; transform: scale(0.95) translateY(10px); } to { opacity:1; transform: scale(1) translateY(0); } }
.modal-close {
    float: right; background: none; border: none; font-size: 1.5rem; cursor: pointer;
    color: #a0b0c0; transition: 0.2s;
}
.modal-close:hover { color: #e74c3c; }
.modal-content h3 { color: var(--navy); margin-bottom: 1rem; }
.modal-content textarea { width: 100%; min-height: 250px; border: 2px solid var(--border); border-radius: 10px; padding: 1rem; font-size: 0.9rem; font-family: inherit; resize: vertical; }
.modal-content input[type="text"] { width: 100%; padding: 0.7rem 1rem; border: 2px solid var(--border); border-radius: 10px; font-size: 0.9rem; }
.btn-row { display: flex; gap: 0.8rem; margin-top: 1rem; justify-content: flex-end; }
.btn-sm {
    padding: 0.5rem 1.4rem; border-radius: 20px; font-size: 0.85rem; font-weight: 600;
    cursor: pointer; border: none; transition: var(--transition);
}
.btn-save { background: var(--accent); color: #fff; }
.btn-save:hover { background: #3a97c8; }
.btn-cancel { background: #eee; color: #666; }
.btn-cancel:hover { background: #ddd; }
.btn-danger { background: #e74c3c; color: #fff; }
.btn-danger:hover { background: #c0392b; }

/* ==================== 等级阶梯 ==================== */
.level-stairs { display: flex; flex-direction: column; gap: 0; max-width: 650px; margin: 0 auto 2rem; }
.level-step {
    display: flex; align-items: center; gap: 1.5rem;
    padding: 1.5rem 2rem; border-radius: 14px; margin-bottom: -8px;
    position: relative; z-index: 1; transition: var(--transition);
}
.level-step:hover { transform: translateX(6px); z-index: 5; }
.level-step .step-num { font-size: 2.5rem; font-weight: 900; min-width: 60px; text-align: center; }
.level-step .step-info { flex: 1; }
.level-step .step-info .step-title { font-size: 1.15rem; font-weight: 700; }
.level-step .step-info .step-role { font-size: 0.8rem; opacity: 0.75; margin-bottom: 0.25rem; }
.level-step .step-info .step-members { font-size: 0.9rem; font-weight: 500; }

.ls-1 { background: linear-gradient(135deg, #fffef5, #fff8e1); border: 2px solid #d4b871; z-index: 4; }
.ls-1 .step-num { color: #b8860b; } .ls-1 .step-title { color: #8b6914; } .ls-1 .step-members { color: #5c4508; }
.ls-2 { background: linear-gradient(135deg, #f8fafc, #eef3f8); border: 2px solid #a0b8d0; z-index: 3; }
.ls-2 .step-num { color: #4a6d8c; } .ls-2 .step-title { color: #3a5c78; } .ls-2 .step-members { color: #2c4a60; }
.ls-3 { background: linear-gradient(135deg, #f6faf7, #eaf3ec); border: 2px solid #8cb89f; z-index: 2; }
.ls-3 .step-num { color: #3d6b4f; } .ls-3 .step-title { color: #2e553b; } .ls-3 .step-members { color: #1f4028; }
.ls-4 { background: linear-gradient(135deg, #f9fafb, #eef1f5); border: 2px solid #c0c8d4; z-index: 1; }
.ls-4 .step-num { color: #6b7a8d; } .ls-4 .step-title { color: #556370; } .ls-4 .step-members { color: #3d4a56; }

/* ==================== 比赛表格 ==================== */
.match-table-wrap { overflow-x: auto; margin-bottom: 2rem; }
.match-table {
    width: 100%; border-collapse: collapse; background: var(--card);
    border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.match-table th { background: var(--navy); color: #fff; padding: 0.9rem 1rem; font-size: 0.88rem; }
.match-table td { padding: 0.8rem 1rem; font-size: 0.88rem; text-align: center; border-bottom: 1px solid var(--border); }
.match-table tr:hover td { background: #f6f9fc; }
.badge { display: inline-block; padding: 0.25rem 0.8rem; border-radius: 14px; font-size: 0.75rem; font-weight: 600; }
.badge-gold { background: #fff8e1; color: #b8860b; }
.badge-silver { background: #f0f4f8; color: #5a6d80; }
.badge-bronze { background: #fdf0e8; color: #b0763a; }

/* ==================== 规则切换 ==================== */
.rule-toggle-wrap { display: flex; gap: 0.8rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.rule-toggle-btn {
    padding: 0.5rem 1.4rem; border-radius: 20px; border: 2px solid var(--border);
    background: #fff; font-size: 0.88rem; font-weight: 600; cursor: pointer;
    transition: var(--transition); color: var(--muted);
}
.rule-toggle-btn.active { background: var(--navy); color: #fff; border-color: var(--navy); }
.rule-toggle-btn:hover:not(.active) { border-color: var(--accent); color: var(--accent); }
.plain-text { background: #fff; border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow); line-height: 2; color: var(--muted); }
.plain-text h3 { color: var(--navy); margin-top: 1.5rem; margin-bottom: 0.8rem; }
.plain-text p { margin-bottom: 0.5rem; }

/* ==================== 创始人 ==================== */
.founders { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: center; margin-bottom: 2rem; }
.founder-card {
    background: #fff; border-radius: 20px; padding: 2rem 1.8rem; text-align: center;
    box-shadow: var(--shadow); border: 2px solid var(--border);
    transition: var(--transition); min-width: 180px;
}
.founder-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
.founder-avatar {
    width: 80px; height: 80px; border-radius: 50%; background: var(--navy);
    display: flex; align-items: center; justify-content: center; margin: 0 auto 1rem;
    font-size: 2rem; font-weight: 900; color: #fff; letter-spacing: 0.05em;
}
.founder-card .fc-name { font-size: 1.3rem; font-weight: 700; color: var(--navy); }
.founder-card .fc-role { font-size: 0.85rem; color: var(--accent); font-weight: 600; margin-top: 0.3rem; }

/* ==================== 联系卡片 ==================== */
.contact-card {
    background: #fff; border-radius: var(--radius); padding: 1.5rem 2rem;
    box-shadow: var(--shadow); border: 1px solid var(--border);
}
.contact-card .contact-row {
    display: flex; align-items: center; gap: 1rem; padding: 0.7rem 0;
    border-bottom: 1px solid #f0f0f0; flex-wrap: wrap;
}
.contact-card .contact-row:last-child { border-bottom: none; }
.contact-card .contact-label { font-weight: 600; color: var(--navy); min-width: 90px; }
.contact-card .contact-value { color: var(--muted); }
.contact-card a { color: var(--accent); font-weight: 500; transition: 0.2s; }
.contact-card a:hover { text-decoration: underline; color: #2a8abf; }

/* ==================== 管理面板 ==================== */
.admin-panel { max-width: 1000px; margin: 0 auto; padding: 100px 1.5rem 3rem; animation: fadeSlideIn 0.5s ease; }
.admin-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 2rem; }
.admin-tab {
    padding: 0.5rem 1.2rem; border-radius: 20px; border: 2px solid var(--border);
    background: #fff; font-size: 0.85rem; font-weight: 600; cursor: pointer;
    transition: var(--transition); color: var(--muted);
}
.admin-tab.active { background: var(--navy); color: #fff; border-color: var(--navy); }
.admin-tab:hover:not(.active) { border-color: var(--accent); color: var(--accent); }
.admin-section { display: none; }
.admin-section.active { display: block; }
.admin-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); margin-bottom: 1.5rem; }
.admin-table th { background: var(--navy); color: #fff; padding: 0.7rem 1rem; font-size: 0.85rem; text-align: left; }
.admin-table td { padding: 0.6rem 1rem; font-size: 0.85rem; border-bottom: 1px solid var(--border); }
.admin-table tr:hover td { background: #f8fafc; }
.admin-inline-input {
    border: 1px solid transparent; padding: 0.3rem 0.5rem; border-radius: 6px;
    font-size: 0.85rem; font-family: inherit; width: 100%; background: transparent;
    transition: 0.2s;
}
.admin-inline-input:hover { border-color: #d0dce8; background: #fafafa; }
.admin-inline-input:focus { border-color: var(--accent); background: #fff; outline: none; box-shadow: 0 0 0 2px rgba(77,168,218,0.1); }

/* ==================== 登录/注册 ==================== */
.auth-page { min-height:100vh; display:flex; align-items:center; justify-content:center; background:linear-gradient(160deg, #0a1628 0%, #0f2137 40%, #162d48 100%); padding:2rem; }
.auth-card { background:#fff; border-radius:20px; padding:2.5rem 2.5rem 2rem; width:100%; max-width:440px; box-shadow:0 20px 60px rgba(0,0,0,0.3); animation:fadeSlideIn 0.5s ease; }
.auth-card h2 { text-align:center; color:var(--navy); font-size:1.6rem; margin-bottom:0.3rem; }
.auth-card .auth-sub { text-align:center; color:var(--muted); font-size:0.85rem; margin-bottom:1.8rem; }
.form-group { margin-bottom:1.2rem; }
.form-group label { display:block; font-size:0.85rem; font-weight:600; color:var(--navy); margin-bottom:0.4rem; }
.form-group input { width:100%; padding:0.75rem 1rem; border:2px solid var(--border); border-radius:10px; font-size:0.9rem; transition:var(--transition); background:#f8fafc; }
.form-group input:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(77,168,218,0.12); background:#fff; }
.btn-auth { width:100%; padding:0.8rem; background:var(--accent); color:#fff; border:none; border-radius:10px; font-size:1rem; font-weight:700; cursor:pointer; transition:var(--transition); margin-top:0.5rem; }
.btn-auth:hover { background:#3a97c8; box-shadow:0 6px 24px rgba(77,168,218,0.35); transform:translateY(-1px); }
.auth-switch { text-align:center; margin-top:1.2rem; font-size:0.85rem; color:var(--muted); }
.auth-switch a { color:var(--accent); font-weight:600; }
.auth-switch a:hover { text-decoration:underline; }
.msg { text-align:center; padding:0.5rem; border-radius:8px; font-size:0.85rem; margin-bottom:1rem; display:none; }
.msg.error { background:#fde8e8; color:#b91c1c; display:block; }
.msg.success { background:#e6f4ea; color:#1e6b34; display:block; }

/* ==================== 底部 ==================== */
.footer { text-align:center; color:#a0b0c0; font-size:0.8rem; padding:2rem 1.5rem; border-top:1px solid var(--border); background:#fff; }

/* ==================== 响应式 ==================== */
@media (max-width:768px) {
    .nav-links { display:none; position:absolute; top:60px; left:0; right:0; background:rgba(15,33,55,0.98); flex-direction:column; padding:1rem; backdrop-filter:blur(20px); }
    .nav-links.open { display:flex; }
    .hamburger { display:flex; }
    .user-nickname { display:none; }
    .page-container, .admin-panel { padding:90px 1rem 2rem; }
    .level-step { flex-direction:column; text-align:center; gap:0.5rem; padding:1.2rem 1rem; }
    .intro-big-text { font-size:3rem; }
    .admin-tabs { gap: 0.3rem; }
    .admin-tab { padding: 0.4rem 0.8rem; font-size: 0.78rem; }
}