:root[data-theme="light"] {
        --bg-color: #f8fafc;
        --bg-gradient: 
        radial-gradient(circle at 10% 20%, rgba(244, 114, 182, 0.25) 0%, transparent 40%),
        radial-gradient(circle at 90% 10%, rgba(129, 140, 248, 0.25) 0%, transparent 40%),
        radial-gradient(circle at 50% 90%, rgba(52, 211, 153, 0.2) 0%, transparent 40%),
        linear-gradient(135deg, #fdf4ff 0%, #e0f2fe 100%);
        --card-bg: rgba(255, 255, 255, 0.8);
        --card-border: rgba(255, 255, 255, 0.95);
        --text-color: #1e293b;
        --text-secondary: #64748b;
        --btn-hover-bg: rgba(255, 255, 255, 0.98);
        --accent-glow: rgba(99, 102, 241, 0.2);
        --modal-bg: rgba(255, 255, 255, 0.85);
        --modal-border: rgba(255, 255, 255, 0.9);
        --link-color: #4f46e5;
    }

    :root[data-theme="dark"] {
        --bg-color: #0f1015;
        --bg-gradient: 
        radial-gradient(circle at 50% 20%, rgba(79, 70, 229, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.1) 0%, transparent 40%),
        linear-gradient(135deg, #0f1015 0%, #1a1c23 100%);
        --card-bg: rgba(255, 255, 255, 0.06);
        --card-border: rgba(255, 255, 255, 0.12);
        --text-color: #f3f4f6;
        --text-secondary: #9ca3af;
        --btn-hover-bg: rgba(255, 255, 255, 0.14);
        --accent-glow: rgba(99, 102, 241, 0.25);
        --modal-bg: rgba(20, 21, 28, 0.85);
        --modal-border: rgba(255, 255, 255, 0.15);
        --link-color: #818cf8;
    }

    body {
        margin: 0;
        padding: 20px;
        background-color: var(--bg-color);
        background-image: var(--bg-gradient);
        background-attachment: fixed;
        color: var(--text-color);
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        display: flex;
        justify-content: center;
        align-items: center;
        min-height: 100vh;
        transition: background 0.4s ease, color 0.4s ease;
    }

    .theme-toggle {
        position: fixed;
        top: 20px;
        right: 20px;
        background: var(--card-bg);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border: 1px solid var(--card-border);
        color: var(--text-color);
        width: 44px;
        height: 44px;
        border-radius: 50%;
        display: flex;
        justify-content: center;
        align-items: center;
        cursor: pointer;
        font-size: 20px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        transition: transform 0.2s ease, background 0.2s ease;
        z-index: 10;
    }

    .theme-toggle:hover {
        transform: scale(1.1);
    }

    .container {
        width: 100%;
        max-width: 440px;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
        z-index: 1;
    }

    .avatar-container {
        width: 100%;
        margin-bottom: 24px;
        position: relative;
        cursor: pointer;
    }

    .avatar-container img {
        width: 100%;
        height: auto;
        max-height: 460px;
        object-fit: contain;
        filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.15));
        transition: transform 0.3s ease;

        -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 72%, rgba(0,0,0,0) 100%);
        mask-image: linear-gradient(to bottom, rgba(0,0,0,1) 72%, rgba(0,0,0,0) 100%);
    }

    .avatar-container:hover img {
        transform: scale(1.02);
    }

    .links-container {
        width: 100%;
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .link-btn {
        display: flex;
        align-items: center;
        position: relative;
        width: 100%;
        padding: 18px 24px;
        background: var(--card-bg);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border: 1px solid var(--card-border);
        color: var(--text-color);
        text-decoration: none;
        border-radius: 16px;
        box-sizing: border-box;
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    }

    .link-btn i {
        font-size: 20px; /* Logo 放大 */
        width: 32px;
        text-align: left;
        z-index: 2; /* 確保在最上層可點擊 */
        transition: transform 0.2s ease;
    }

    .link-btn span {
        position: absolute;
        left: 0;
        right: 0;
        text-align: center;
        font-size: 17px;
        font-weight: 750;
        letter-spacing: 0.8px;
        pointer-events: none;
    }

    .link-btn:hover {
        transform: translateY(-3px);
        background: var(--btn-hover-bg);
        border-color: rgba(99, 102, 241, 0.4);
        box-shadow: 0 8px 25px var(--accent-glow);
    }

    .link-btn:hover i {
        transform: scale(1.12);
    }

    .modal-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(5px);
        -webkit-backdrop-filter: blur(5px);
        display: flex;
        justify-content: center;
        align-items: center;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
        z-index: 100;
    }

    .modal-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .modal-card {
        background: var(--modal-bg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid var(--modal-border);
        width: 85%;
        max-width: 320px;
        padding: 24px;
        border-radius: 20px;
        text-align: center;
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
        transform: scale(0.9);
        transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .modal-overlay.active .modal-card {
        transform: scale(1);
    }

    .modal-title {
        font-size: 16px;
        font-weight: bold;
        margin-bottom: 12px;
        color: var(--text-color);
    }

    .modal-desc {
        font-size: 14px;
        color: var(--text-secondary);
        margin-bottom: 20px;
    }

    .artist-link {
        display: inline-block;
        font-size: 16px;
        font-weight: 600;
        color: var(--link-color);
        text-decoration: none;
        padding: 8px 16px;
        border-radius: 10px;
        background: rgba(99, 102, 241, 0.1);
        transition: background 0.2s ease, transform 0.2s ease;
        margin-bottom: 20px;
    }

    .artist-link:hover {
        background: rgba(99, 102, 241, 0.2);
        transform: translateY(-2px);
    }

    .modal-close-btn {
        display: block;
        width: 100%;
        padding: 10px;
        background: var(--card-bg);
        border: 1px solid var(--card-border);
        color: var(--text-color);
        border-radius: 10px;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        transition: background 0.2s ease;
    }

    .modal-close-btn:hover {
        background: var(--btn-hover-bg);
    }

    @media screen and (max-width: 480px) {
        body { padding: 15px; }
        .avatar-container img { max-height: 380px; }
        .link-btn { padding: 16px 20px; }
        .link-btn span { font-size: 16px; }
    }