/* 匯入外部字型佔位 */
@font-face {
    font-family: 'CustomFont';
    src: url('../assets/font.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

/* CSS 變數 - 控制深淺主題 */
:root {
    --bg-start: #c3d4fe;
    --bg-end: #e8d5f5;
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.4);
    --text-color: #1a1a2e;
    --shadow: rgba(31, 38, 135, 0.2);
    --input-bg: rgba(255,255,255,0.6);
}

[data-theme="dark"] {
    --bg-start: #0f0f1a;
    --bg-end: #1b1b2f;
    --glass-bg: rgba(0, 0, 0, 0.45);
    --glass-border: rgba(255, 255, 255, 0.15);
    --text-color: #eeeeff;
    --shadow: rgba(0, 0, 0, 0.6);
    --input-bg: rgba(255,255,255,0.15);
}

/* 全域重置與背景 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'CustomFont', 'Segoe UI', system-ui, sans-serif;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
    transition: background 0.4s ease;
    padding: 20px;
}

/* 背景圖層 (佔位 JPG 疊加) */
.bg-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0.25; /* 調低透明度讓漸層仍可見 */
    z-index: 0;
    transition: opacity 0.4s;
}

.container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 700px;
}

/* ★ 毛玻璃核心樣式 ★ */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 32px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 50px var(--shadow);
    padding: 40px 35px;
    text-align: center;
    color: var(--text-color);
    transition: all 0.3s ease;
}

h1 {
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 25px;
    font-size: 2rem;
}

/* 搜尋欄 */
.search-area {
    display: flex;
    gap: 12px;
    margin-bottom: 35px;
}

.search-area input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    border-radius: 60px;
    background: var(--input-bg);
    backdrop-filter: blur(5px);
    color: var(--text-color);
    font-size: 1rem;
    outline: 1px solid transparent;
    transition: 0.25s;
}
.search-area input::placeholder {
    color: var(--text-color);
    opacity: 0.5;
}
.search-area input:focus {
    outline: 1px solid var(--glass-border);
    background: rgba(255,255,255,0.3);
}
[data-theme="dark"] .search-area input:focus {
    background: rgba(255,255,255,0.2);
}

.search-area button {
    padding: 14px 28px;
    border: none;
    border-radius: 60px;
    background: var(--text-color);
    color: var(--bg-start);
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    opacity: 0.9;
}
.search-area button:hover {
    transform: scale(1.03);
    opacity: 1;
}

/* 連結網格 */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin: 25px 0 30px;
}

.links-grid a {
    display: block;
    padding: 14px 8px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(4px);
    border-radius: 16px;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    border: 1px solid rgba(255,255,255,0.1);
    transition: 0.2s;
}
.links-grid a:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 20px var(--shadow);
}

/* 時鐘 */
#clock {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 3px;
    margin-top: 10px;
    font-variant-numeric: tabular-nums;
}

/* 切換按鈕 */
#theme-toggle {
    position: fixed;
    top: 25px;
    right: 30px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.6rem;
    cursor: pointer;
    color: var(--text-color);
    box-shadow: 0 4px 15px var(--shadow);
    transition: 0.25s;
    z-index: 99;
}
#theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
}

/* RWD 響應式 */
@media (max-width: 500px) {
    .glass { padding: 25px 18px; }
    .links-grid { grid-template-columns: repeat(2, 1fr); }
    #theme-toggle { top: 15px; right: 15px; width: 44px; height: 44px; }
}

/* 分組標題樣式 */
.group-section {
    margin-top: 28px;
}

.group-title {
    text-align: left;
    font-size: 0.95rem;
    font-weight: 600;
    opacity: 0.8;
    margin-bottom: 12px;
    padding-left: 6px;
    letter-spacing: 1px;
    color: var(--text-color);
    border-left: 3px solid var(--text-color);
    padding-left: 12px;
}

/* 篩選時隱藏連結的過渡效果 */
.links-grid a {
    transition: all 0.2s ease;
}

/* ===== 毛玻璃自訂彈窗 (Modal) ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999;
    opacity: 0;
    pointer-events: none;  /* 隱藏時無法點擊 */
    transition: opacity 0.4s ease;
}
.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;  /* 顯示時可點擊 */
}

.modal-content {
    max-width: 420px;
    width: 90%;
    padding: 40px 30px;
    text-align: center;
    border-radius: 32px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}
/* 彈出時微微放大 */
.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 15px;
}
.modal-content p {
    font-size: 1.1rem;
    opacity: 0.85;
    margin-bottom: 30px;
    line-height: 1.6;
}
.modal-content button {
    padding: 14px 48px;
    border: none;
    border-radius: 60px;
    background: var(--text-color);
    color: var(--bg-start);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 15px var(--shadow);
}
.modal-content button:hover {
    transform: scale(1.05);
    opacity: 0.9;
}