/* --- CSS Reset & Basic Styles --- */
:root {
    --light-bg: #f8f9fa;
    --light-card-bg: rgba(255, 255, 255, 0.9);
    --light-text: #212529;
    --light-text-secondary: #6c757d;
    --light-border: #dee2e6;
    --light-shadow: rgba(0, 0, 0, 0.05);
    --light-primary: #339af0;
    --light-primary-hover: #1c7ed6;
    --light-success: #28a745;
    --light-warning: #ffc107;
    --light-danger: #dc3545;
    --dark-bg: #121212;
    --dark-card-bg: rgba(30, 30, 30, 0.9);
    --dark-text: #e9e9e9;
    --dark-text-secondary: #a0a0a0;
    --dark-border: #333;
    --dark-shadow: rgba(0, 0, 0, 0.2);
    --dark-primary: #4dabf7;
    --dark-primary-hover: #74c0fc;
    --dark-success: #34c759;
    --dark-warning: #ffcc00;
    --dark-danger: #ff3b30;
    --bg-color: var(--light-bg);
    --card-bg-color: var(--light-card-bg);
    --text-color: var(--light-text);
    --text-secondary-color: var(--light-text-secondary);
    --border-color: var(--light-border);
    --shadow-color: var(--light-shadow);
    --primary-color: var(--light-primary);
    --primary-hover-color: var(--light-primary-hover);
    --success-color: var(--light-success);
    --warning-color: var(--light-warning);
    --danger-color: var(--light-danger);
    --border-radius: 12px;
    --transition-speed: 0.3s ease;
}

html[data-theme='dark'] {
    --bg-color: var(--dark-bg);
    --card-bg-color: var(--dark-card-bg);
    --text-color: var(--dark-text);
    --text-secondary-color: var(--dark-text-secondary);
    --border-color: var(--dark-border);
    --shadow-color: var(--dark-shadow);
    --primary-color: var(--dark-primary);
    --primary-hover-color: var(--dark-primary-hover);
    --success-color: var(--dark-success);
    --warning-color: var(--dark-warning);
    --danger-color: var(--dark-danger);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- Particle Background --- */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 600px;
    height: 600px;
    background: linear-gradient(45deg, rgba(0, 123, 255, 0.15), rgba(40, 167, 69, 0.15));
    border-radius: 50%;
    filter: blur(100px);
    animation: float 15s infinite;
}

html[data-theme="dark"] .particle {
    background: linear-gradient(45deg, rgba(55, 147, 255, 0.15), rgba(52, 199, 89, 0.15));
    mix-blend-mode: screen;
    opacity: 0.2;
}

html[data-theme="light"] .particle {
    mix-blend-mode: multiply;
    opacity: 0.1;
}

.particle:nth-child(1) { top: -20%; left: -20%; animation-delay: 0s; width: 800px; height: 800px; }
.particle:nth-child(2) { top: 30%; right: -30%; animation-delay: -3s; width: 700px; height: 700px; }
.particle:nth-child(3) { bottom: -20%; left: 40%; animation-delay: -6s; width: 650px; height: 650px; }
.particle:nth-child(4) { bottom: 20%; right: 20%; animation-delay: -9s; width: 550px; height: 550px; }
.particle:nth-child(5) { top: 40%; left: 30%; animation-delay: -12s; width: 580px; height: 580px; }

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg) scale(1); }
    25% { transform: translate(15%, 15%) rotate(90deg) scale(1.2); }
    50% { transform: translate(-5%, -15%) rotate(180deg) scale(0.8); }
    75% { transform: translate(-15%, 10%) rotate(270deg) scale(1.1); }
    100% { transform: translate(0, 0) rotate(360deg) scale(1); }
}

/* --- Layout --- */
.container {
    max-width: 680px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* --- Header --- */
header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    /* 内联样式已经控制了尺寸，这里只负责边距 */
    margin: 0 auto 1rem;
    display: block; /* 确保 margin auto 生效 */
}

.notice {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 1.5rem;
    box-shadow: 0 4px 15px var(--shadow-color);
    text-align: left;
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
}

.notice p {
    display: flex;
    align-items: center;
    margin: 0.5rem 0;
    color: var(--text-secondary-color);
}

.notice p:first-child { margin-top: 0; }
.notice p:last-child { margin-bottom: 0; }

.notice i {
    margin-right: 0.8rem;
    color: var(--primary-color);
    width: 20px;
    text-align: center;
}

/* --- Official Site Warning --- */
.official-warning {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin: 2.5rem 0;
    border: 1px solid var(--danger-color);
    border-radius: var(--border-radius);
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    font-weight: 500;
    font-size: 0.95rem;
}

.official-warning i {
    font-size: 1.5rem;
}

.official-warning p {
    margin: 0;
}

/* --- Main Access Button --- */
.main-access {
    text-align: center;
    margin-bottom: 3rem;
}

#btn-main-access {
    font-size: 1.2rem;
    font-weight: 600;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    background: linear-gradient(45deg, var(--primary-color), var(--primary-hover-color));
    color: white;
    transition: all var(--transition-speed);
    box-shadow: 0 8px 25px -8px var(--primary-color);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

#btn-main-access:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px -10px var(--primary-color);
}

#btn-main-access:disabled {
    background: #ccc;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* --- Section Title --- */
.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    color: var(--text-color);
}

/* --- Backup Domain List & Others --- */
.backup-domains, .support-links, .fallback-domains {
    margin-bottom: 3rem;
}

.description, .domain-card, .support-btn {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.description {
    font-size: 0.9rem;
    color: var(--text-secondary-color);
    margin-bottom: 1.5rem;
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius);
}

.backup-domains .description { border-left: 3px solid var(--warning-color); }
.fallback-domains .description { border-left: 3px solid var(--danger-color); }

.domain-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: all var(--transition-speed);
}

.domain-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow-color);
    border-color: var(--primary-color);
}

.domain-info { display: flex; align-items: center; gap: 1rem; }
.domain-name { font-family: 'SF Mono', 'Menlo', 'Consolas', monospace; font-size: 1.1rem; font-weight: 500; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; }
.status-dot.ok { background-color: var(--success-color); }
.status-dot.error { background-color: var(--danger-color); }
.status-text { font-size: 0.9rem; color: var(--text-secondary-color); }
.domain-actions .btn { padding: 0.5rem 1rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); cursor: pointer; font-weight: 500; background-color: transparent; color: var(--primary-color); transition: all var(--transition-speed); margin-left: 0.5rem; }
.domain-actions .btn:hover { background-color: var(--primary-color); color: white; border-color: var(--primary-color); }

/* --- Support Links --- */
.support-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.support-btn { display: flex; align-items: center; justify-content: center; gap: 0.75rem; padding: 1rem; text-decoration: none; color: var(--text-color); border-radius: var(--border-radius); font-weight: 500; transition: all var(--transition-speed); }
.support-btn:hover { color: var(--primary-color); border-color: var(--primary-color); transform: translateY(-2px); box-shadow: 0 6px 20px var(--shadow-color); }
.support-btn i { font-size: 1.2rem; }

/* --- Footer & Theme Switch --- */
footer { text-align: center; padding: 2rem 0; border-top: 1px solid var(--border-color); color: var(--text-secondary-color); font-size: 0.9rem; }
.theme-switch-wrapper { position: fixed; bottom: 20px; right: 20px; z-index: 1000; }
#theme-switch { width: 50px; height: 50px; border-radius: 50%; background-color: var(--card-bg-color); border: 1px solid var(--border-color); box-shadow: 0 4px 15px var(--shadow-color); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: var(--text-color); transition: all var(--transition-speed); backdrop-filter: blur(10px); }
#theme-switch:hover { transform: scale(1.1); border-color: var(--primary-color); color: var(--primary-color); }

/* --- Welcome Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}
.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}
.modal-content {
    background-color: var(--card-bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 400px;
    text-align: center;
    backdrop-filter: blur(10px);
    transform: scale(0.9);
    transition: transform 0.3s;
}
.modal-overlay.show .modal-content {
    transform: scale(1);
}
.modal-content h2 { font-size: 1.5rem; margin-bottom: 1rem; color: var(--text-color); }
.modal-content p { font-size: 1rem; color: var(--text-secondary-color); margin-bottom: 1.5rem; }
#close-modal-btn {
    font-size: 1rem;
    font-weight: 600;
    padding: 0.8rem 2rem;
    width: 100%;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    background-color: var(--primary-color);
    color: white;
    transition: all var(--transition-speed);
}
#close-modal-btn:hover { opacity: 0.85; }

/* --- Responsive --- */
@media (max-width: 600px) {
    .domain-card { flex-direction: column; align-items: flex-start; gap: 1rem; }
    .domain-actions { width: 100%; display: flex; }
    .domain-actions .btn { flex-grow: 1; text-align: center; }
}