:root {
    --primary: #00f2fe;
    --secondary: #7000ff;
    --bg: #050508;
}

body {
    background-color: var(--bg);
    color: #e0e0e0;
    font-family: 'Inter', 'PingFang TC', sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 80px 0 40px;
    box-sizing: border-box;
}

.bg-glow {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 20% 30%, rgba(112, 0, 255, 0.1) 0%, transparent 50%), 
                radial-gradient(circle at 80% 70%, rgba(0, 242, 254, 0.1) 0%, transparent 50%);
    z-index: -1;
}

/* 導覽列 */
nav.top-nav { position: absolute; top: 0; width: 100%; padding: 20px 40px; display: flex; justify-content: space-between; box-sizing: border-box; align-items: center; }
.logo { font-weight: 800; color: var(--primary); text-shadow: 0 0 10px var(--primary); text-decoration: none; font-size: 1.2rem; }

/* 標籤選單 */
.tab-menu { display: flex; gap: 10px; margin-bottom: 25px; }
.tab-link { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.1); color: #888; padding: 8px 18px; border-radius: 10px; cursor: pointer; text-decoration: none; font-size: 0.8rem; transition: 0.3s; }
.tab-link.active { border-color: var(--primary); color: var(--primary); background: rgba(0, 242, 254, 0.1); }

/* 主卡片容器 */
.main-card {
    width: 92%;
    max-width: 900px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 24px;
    padding: 1.5px;
}

.inner-content {
    background: #0a0a0f;
    border-radius: 23px;
    padding: 50px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    font-size: 2.8rem;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0 0 15px 0;
}

/* --- 強制網格佈局 --- */
.system-info {
    margin-top: 30px;
    display: grid !important; /* 強制開啟網格 */
    grid-template-columns: repeat(2, 1fr) !important; /* 強制兩欄 */
    gap: 15px;
    width: 100%;
    max-width: 750px;
}

.info-item {
    background: rgba(255, 255, 255, 0.02);
    padding: 18px;
    border-radius: 12px;
    border: 1px solid rgba(0, 242, 254, 0.08);
    text-align: left;
    transition: 0.2s ease-in-out;
}

.info-item:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(0, 242, 254, 0.4);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.info-label {
    color: var(--primary);
    font-family: 'Courier New', Courier, monospace;
    display: block;
    margin-bottom: 6px;
    font-size: 0.75rem;
    font-weight: bold;
    opacity: 0.8;
}

.info-item span:not(.info-label) {
    font-size: 0.95rem;
    font-weight: 500;
}

footer { margin-top: 40px; font-size: 0.7rem; color: #444; }

/* 手機版適配 */
@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    .system-info { grid-template-columns: 1fr !important; } /* 手機改單欄 */
    .inner-content { padding: 30px 15px; }
    nav.top-nav { padding: 15px 20px; }
}