/* ==========================================
   CSS 變數
   ========================================== */
:root {
    --navy: #1a237e;
    --navy-dark: #0d1257;
    --navy-light: #3949ab;

    --bg-gradient: linear-gradient(135deg, #e8ecf7 0%, #f0f4ff 50%, #e8f0fe 100%);
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(255, 255, 255, 0.9);
    --item-bg: rgba(255, 255, 255, 0.95);
    --item-border: #edf0f7;
    --item-hover-shadow: 0 8px 24px rgba(26, 35, 126, 0.12);

    --text-primary: #1a1a2e;
    --text-secondary: #5f6b85;
    --text-muted: #9aa3b5;

    --icon-blue: #dbeafe;
    --icon-blue-text: #1d4ed8;
    --icon-gold: #fef9c3;
    --icon-gold-text: #b45309;
    --icon-green: #dcfce7;
    --icon-green-text: #16a34a;
    --icon-purple: #f3e8ff;
    --icon-purple-text: #7c3aed;
    --icon-orange: #ffedd5;
    --icon-orange-text: #c2410c;
    --icon-red: #fee2e2;
    --icon-red-text: #dc2626;

    --navbar-bg: linear-gradient(90deg, #1a237e 0%, #283593 100%);
    --navbar-shadow: 0 2px 20px rgba(26, 35, 126, 0.3);

    --search-bg: #f1f4fb;
    --search-border: #dde3f0;
    --search-focus-border: var(--navy-light);

    --footer-text: #8a95a8;
    --footer-link: var(--navy-light);

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式 */
[data-theme="dark"] {
    --bg-gradient: linear-gradient(135deg, #0d0f1a 0%, #141628 50%, #0f1420 100%);
    --card-bg: rgba(20, 22, 45, 0.85);
    --card-border: rgba(255, 255, 255, 0.08);
    --item-bg: rgba(28, 31, 60, 0.9);
    --item-border: rgba(255, 255, 255, 0.06);
    --item-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);

    --text-primary: #e8eaf6;
    --text-secondary: #9fa8c5;
    --text-muted: #6b7394;

    --icon-blue: rgba(29, 78, 216, 0.22);
    --icon-blue-text: #93c5fd;
    --icon-gold: rgba(180, 83, 9, 0.22);
    --icon-gold-text: #fcd34d;
    --icon-green: rgba(22, 163, 74, 0.22);
    --icon-green-text: #86efac;
    --icon-purple: rgba(124, 58, 237, 0.22);
    --icon-purple-text: #c4b5fd;
    --icon-orange: rgba(194, 65, 12, 0.22);
    --icon-orange-text: #fb923c;
    --icon-red: rgba(220, 38, 38, 0.22);
    --icon-red-text: #fca5a5;

    --navbar-bg: linear-gradient(90deg, #0d0f1a 0%, #141628 100%);
    --navbar-shadow: 0 2px 20px rgba(0, 0, 0, 0.55);

    --search-bg: rgba(255, 255, 255, 0.05);
    --search-border: rgba(255, 255, 255, 0.1);
    --search-focus-border: #7986cb;

    --footer-text: #4a5173;
    --footer-link: #7986cb;
}

/* ==========================================
   基礎
   ========================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-gradient);
    background-attachment: fixed;
    font-family: "PingFang TC", "Microsoft JhengHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    color: var(--text-primary);
    transition: background var(--transition-smooth), color var(--transition-smooth);
}

/* ==========================================
   導覽列
   ========================================== */
.main-navbar {
    background: var(--navbar-bg);
    box-shadow: var(--navbar-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 1.25rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand-wrap {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: #fff;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.navbar-brand-wrap i { font-size: 1.3rem; opacity: 0.9; }

.theme-btn {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: rotate(20deg);
}

/* ==========================================
   主要內容
   ========================================== */
.main-content {
    flex: 1;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 2.5rem 1rem;
}

/* 玻璃擬態卡片 */
.portal-card {
    width: 100%;
    max-width: 600px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1.5rem;
    padding: 2rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(26, 35, 126, 0.1), 0 2px 8px rgba(0, 0, 0, 0.05);
    animation: slide-up 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
    transition: background var(--transition-smooth), border-color var(--transition-smooth),
                box-shadow var(--transition-smooth);
}

[data-theme="dark"] .portal-card {
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.3);
}

.card-header-section {
    text-align: center;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 0.3rem;
    letter-spacing: 0.03em;
    transition: color var(--transition-smooth);
}

.card-subtitle {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
    transition: color var(--transition-smooth);
}

/* ==========================================
   搜尋列
   ========================================== */
.search-wrapper {
    position: relative;
    margin-bottom: 1.25rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.95rem;
    pointer-events: none;
    transition: color var(--transition-fast);
}

.search-input {
    width: 100%;
    background: var(--search-bg);
    border: 1.5px solid var(--search-border);
    border-radius: 0.875rem;
    padding: 0.7rem 2.8rem 0.7rem 2.6rem;
    font-size: 0.95rem;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: all var(--transition-fast);
}

.search-input::placeholder { color: var(--text-muted); }

.search-input:focus {
    border-color: var(--search-focus-border);
    background: var(--item-bg);
    box-shadow: 0 0 0 3px rgba(57, 73, 171, 0.12);
}

.search-clear {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.2rem;
    display: none;
    font-size: 1rem;
    line-height: 1;
    transition: color var(--transition-fast);
}

.search-clear:hover { color: var(--text-secondary); }
.search-clear.visible { display: flex; align-items: center; }

/* ==========================================
   功能列表
   ========================================== */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.feature-item {
    display: flex;
    align-items: center;
    background: var(--item-bg);
    border: 1.5px solid var(--item-border);
    border-radius: 1rem;
    padding: 0.85rem 1.1rem;
    text-decoration: none;
    color: var(--text-primary);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth),
                border-color var(--transition-smooth), background var(--transition-smooth),
                opacity var(--transition-smooth);
}

.feature-item.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.feature-item:hover {
    border-color: var(--navy-light);
    transform: translateY(-3px) scale(1.01);
    box-shadow: var(--item-hover-shadow);
    color: var(--text-primary);
    text-decoration: none;
}

.feature-item:active {
    transform: translateY(-1px) scale(0.99);
    transition-duration: 0.1s;
}

/* Ripple */
.feature-item .ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: ripple-anim 0.5s linear;
    background: rgba(57, 73, 171, 0.15);
    pointer-events: none;
}

@keyframes ripple-anim {
    to { transform: scale(4); opacity: 0; }
}

/* 圖示容器 */
.feature-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-right: 0.9rem;
    font-size: 1.3rem;
    transition: transform var(--transition-fast);
}

.feature-item:hover .feature-icon-wrap {
    transform: scale(1.1) rotate(-3deg);
}

.bg-blue   { background: var(--icon-blue);   color: var(--icon-blue-text); }
.bg-gold   { background: var(--icon-gold);   color: var(--icon-gold-text); }
.bg-green  { background: var(--icon-green);  color: var(--icon-green-text); }
.bg-purple { background: var(--icon-purple); color: var(--icon-purple-text); }
.bg-orange { background: var(--icon-orange); color: var(--icon-orange-text); }
.bg-red    { background: var(--icon-red);    color: var(--icon-red-text); }

/* 文字 */
.feature-text { flex: 1; min-width: 0; }

.feature-name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
    transition: color var(--transition-smooth);
}

.feature-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-smooth);
}

/* 箭頭 */
.feature-arrow {
    font-size: 1.6rem;
    color: var(--text-muted);
    flex-shrink: 0;
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.feature-item:hover .feature-arrow {
    transform: translateX(5px);
    color: var(--navy-light);
}

[data-theme="dark"] .feature-item:hover .feature-arrow { color: #7986cb; }

/* 搜尋無結果 */
.no-results {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.no-results i {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.no-results p { font-size: 0.9rem; margin: 0; }

.feature-item.hidden { display: none; }

/* ==========================================
   頁尾
   ========================================== */
.main-footer {
    padding: 1.25rem 1rem;
    text-align: center;
}

.footer-inner {
    font-size: 0.8rem;
    color: var(--footer-text);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.4rem;
    transition: color var(--transition-smooth);
}

.footer-divider { opacity: 0.4; }

.footer-link {
    color: var(--footer-link);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.footer-link:hover { opacity: 0.75; text-decoration: underline; }

/* ==========================================
   進場動畫
   ========================================== */
@keyframes slide-up {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ==========================================
   手機版
   ========================================== */
@media (max-width: 576px) {
    .main-content { padding: 1.5rem 0.75rem; }

    .portal-card {
        padding: 1.5rem 1.1rem;
        border-radius: 1.25rem;
    }

    .navbar-brand-wrap { font-size: 1rem; }

    .feature-item { padding: 0.75rem 0.9rem; }

    .feature-icon-wrap {
        width: 42px;
        height: 42px;
        font-size: 1.15rem;
    }

    .feature-name { font-size: 0.95rem; }
}