:root {
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --green: #10b981;
    --green-glow: rgba(16, 185, 129, 0.3);
    --red: #ef4444;
    --red-glow: rgba(239, 68, 68, 0.3);
    --yellow: #f59e0b;
    --yellow-glow: rgba(245, 158, 11, 0.3);
    --border-color: #cbd5e1;
    --hover-shadow: rgba(0, 0, 0, 0.1);
    --btn-bg: #e2e8f0;
    --btn-hover: #cbd5e1;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    padding: 2rem;
}

/* Login Overlay */
#login-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.login-box {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px -5px var(--hover-shadow);
    text-align: center;
    border: 1px solid var(--border-color);
    max-width: 400px;
    width: 100%;
}

.login-box img {
    width: 80px;
    margin-bottom: 1.5rem;
}

.login-box h2 {
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.login-box p {
    color: var(--text-muted);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

.login-input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    margin-bottom: 1rem;
    background-color: var(--bg-color);
    color: var(--text-main);
    outline: none;
    transition: border-color 0.2s;
}

.login-input:focus {
    border-color: #38bdf8;
}

.login-button {
    width: 100%;
    padding: 12px;
    background: linear-gradient(90deg, #38bdf8, #818cf8);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.login-button:hover {
    opacity: 0.9;
}

#login-error {
    color: var(--red);
    font-size: 0.85rem;
    margin-top: 1rem;
    display: none;
}

/* Main UI */
.container {
    max-width: 1200px;
    margin: 0 auto;
    display: none; /* Hidden until login */
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.logo {
    width: 64px;
    height: 64px;
    object-fit: contain;
    border-radius: 12px;
}

.header-text h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.2rem;
    background: linear-gradient(90deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-text p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.user-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.user-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease;
}

.user-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px var(--hover-shadow);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.indicator {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    margin-right: 12px;
}

.indicator-green {
    background-color: var(--green);
    box-shadow: 0 0 12px var(--green-glow);
}

.indicator-yellow {
    background-color: var(--yellow);
    box-shadow: 0 0 12px var(--yellow-glow);
}

.indicator-red {
    background-color: var(--red);
    box-shadow: 0 0 12px var(--red-glow);
}

.status-text {
    font-weight: 600;
    font-size: 0.9rem;
}

.username {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    word-break: break-all;
}

.updated-time {
    margin-top: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.loading, .empty, .error {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    font-size: 1.2rem;
}