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

body {
    font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
    background: #f7f3ec;
    color: #2b2b2b;
    line-height: 1.6;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 24px 16px 60px;
}

.site-header {
    text-align: center;
    margin-bottom: 24px;
}

.site-header h1 {
    font-size: 24px;
    color: #8a2c1d;
    margin-bottom: 4px;
}

.subtitle {
    color: #888;
    font-size: 14px;
}

.calling-board {
    background: #8a2c1d;
    color: #fff;
    border-radius: 12px;
    padding: 32px 16px;
    text-align: center;
    margin-bottom: 24px;
}

.board-label {
    font-size: 14px;
    opacity: 0.85;
}

.board-number {
    font-size: 64px;
    font-weight: bold;
    margin: 8px 0;
}

.board-hint {
    font-size: 12px;
    opacity: 0.7;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.btn {
    display: block;
    text-align: center;
    padding: 14px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 16px;
    font-weight: bold;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: #c0392b;
    color: #fff;
}

.btn-secondary {
    background: #fff;
    color: #c0392b;
    border: 1px solid #c0392b;
}

.btn-block {
    width: 100%;
}

.external-links h2 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #555;
}

.link-card {
    display: block;
    background: #fff;
    border: 1px solid #e0d8c8;
    border-radius: 8px;
    padding: 14px;
    text-decoration: none;
    color: #8a2c1d;
    font-weight: bold;
}

.tabs {
    display: flex;
    margin-bottom: 16px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #c0392b;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background: #fff;
    border: none;
    color: #c0392b;
    font-weight: bold;
    cursor: pointer;
}

.tab-btn.active {
    background: #c0392b;
    color: #fff;
}

.reg-form {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #e0d8c8;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    margin-bottom: 6px;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}

.hint {
    background: #fef3e2;
    color: #8a5a00;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 16px;
}

.alert {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: #fce8e6;
    color: #c0392b;
}

.result-box {
    background: #fff;
    border-radius: 12px;
    padding: 32px 16px;
    text-align: center;
    border: 1px solid #e0d8c8;
}

.result-box.success .big-number {
    font-size: 56px;
    font-weight: bold;
    color: #c0392b;
    margin: 12px 0;
}

.result-box.success .big-number.small {
    font-size: 36px;
    color: #555;
}

.result-box .btn {
    margin-top: 20px;
}

.back-link {
    text-align: center;
    margin-top: 16px;
}

.back-link a {
    color: #888;
    text-decoration: none;
    font-size: 14px;
}