/* ============================================================
   header.css - 頂部導航樣式（支援雙主題）
   ============================================================ */

/* ==================== 基本導航 ==================== */
.navbar-custom {
    background: var(--gradient-primary);
    padding: 0.75rem 0;
    box-shadow: var(--shadow-md);
    z-index: 1030;
    transition: background var(--transition-base), padding var(--transition-base);
    backdrop-filter: blur(10px);
}

.navbar-custom.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .navbar-custom {
    background: linear-gradient(135deg, #0f1419 0%, #1e3a5f 100%);
    border-bottom: 1px solid rgba(77, 171, 247, 0.15);
}

/* ==================== 品牌標誌 ==================== */
.navbar-custom .navbar-brand {
    color: var(--text-light);
    font-size: 1.25rem;
    font-weight: 700;
    transition: transform var(--transition-base);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0;
}

.navbar-custom .navbar-brand:hover {
    transform: scale(1.03);
    color: var(--text-light);
}

.navbar-logo {
    height: 40px;
    width: auto;
    transition: transform var(--transition-base);
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.navbar-brand:hover .navbar-logo {
    transform: rotate(-5deg);
}

.brand-text {
    font-size: 1.25rem;
    line-height: 1;
    margin: 0;
    padding: 0;
    white-space: nowrap;
    background: linear-gradient(135deg, #ffffff 0%, #ffd43b 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

/* ==================== 行動裝置優化 ==================== */
@media (max-width: 767.98px) {
    body {
        padding-top: 60px;
    }

    .navbar-custom {
        padding: 0.5rem 0;
    }

    .navbar-logo {
        height: 30px;
    }

    .brand-text {
        font-size: 1rem;
    }

    .theme-toggle-btn {
        width: 36px;
        height: 36px;
    }
}