:root {
    --accent-color: #ff8888;
    --accent-strong: color-mix(in srgb, var(--accent-color) 85%, white 15%);
    --accent-soft: color-mix(in srgb, var(--accent-color) 40%, white 10%);
    --accent-glow: color-mix(in srgb, var(--accent-color) 35%, transparent);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.78);
    --bg-dark-overlay: rgba(0, 0, 0, 0.55);
    --radius-ui: 24px;
    --input-bg: rgba(255, 255, 255, 0.06);
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #000;
    font-family: "Noto Sans TC", "Inter", system-ui, sans-serif;
    color: var(--text-primary);
    overflow: hidden;
    animation: fadeIn 0.8s ease-out;
}

.full-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
}

.full-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(60%) grayscale(18%) blur(4px);
    transform: scale(1.03);
}

.full-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, color-mix(in srgb, var(--accent-color) 8%, transparent), transparent 40%), var(--bg-dark-overlay);
    z-index: -1;
}

.login-shell {
    width: 100%;
    max-width: 420px;
    padding: 40px 32px;
    position: relative;
    z-index: 10;
    background: rgba(255, 255, 255, 0.07);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-ui);
    border: 1px solid color-mix(in srgb, var(--accent-color) 28%, white 15%);
    box-shadow: 0 18px 60px color-mix(in srgb, var(--accent-color) 15%, black 20%);
    animation: fadeInScale 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.login-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--accent-strong);
    margin-bottom: 8px;
    text-align: center;
    text-shadow: 0 0 15px var(--accent-glow);
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
    text-align: center;
    line-height: 1.6;
}

.auth-input {
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 16px;
    border-radius: 12px;
    border: 1px solid color-mix(in srgb, var(--accent-color) 24%, white 20%);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: all 0.2s ease;
}

.auth-input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.auth-input:focus {
    border-color: var(--accent-strong);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 15px var(--accent-glow);
}

.login-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    align-items: center;
}

.primary-btn {
    padding: 12px 20px;
    font-weight: 700;
    font-size: 15px;
    border: none;
    border-radius: 12px;
    background: var(--accent-strong);
    color: #1a1a1a;
    cursor: pointer;
    transition: transform 0.1s, background 0.2s, box-shadow 0.2s;
    flex: 1;
}

.primary-btn:hover {
    background: color-mix(in srgb, var(--accent-color) 92%, white 8%);
    box-shadow: 0 4px 12px var(--accent-glow);
    transform: translateY(-1px);
}

.primary-btn:active {
    transform: scale(0.98);
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.05);
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.status-text {
    min-height: 20px;
    font-size: 13px;
    color: var(--accent-soft);
    margin-top: 16px;
    text-align: center;
    font-weight: 500;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
}