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

body {
    font-family: "Segoe UI", "Microsoft YaHei", -apple-system, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at top, #1e293b 0%, #0f172a 65%);
    color: #e2e8f0;
    padding: 20px;
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
    background-size: 32px 32px;
    pointer-events: none;
}

.admin-card {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 420px;
    background: rgba(15, 23, 42, 0.78);
    border: 1px solid rgba(148, 163, 184, 0.16);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    padding: 40px 36px 30px;
}

.admin-header {
    text-align: center;
    margin-bottom: 30px;
}

.shield-badge {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}

.shield-badge svg {
    width: 32px;
    height: 32px;
    fill: #ffffff;
}

.admin-header h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 1px;
}

.admin-header .subtitle {
    margin-top: 6px;
    font-size: 13px;
    color: #94a3b8;
    letter-spacing: 2px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 8px;
}

.input-wrap {
    position: relative;
}

.input-wrap input {
    width: 100%;
    padding: 12px 44px 12px 14px;
    font-size: 15px;
    color: #f1f5f9;
    background: rgba(30, 41, 59, 0.85);
    border: 1px solid rgba(148, 163, 184, 0.25);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-wrap input::placeholder {
    color: #64748b;
}

.input-wrap input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.toggle-pwd {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: #64748b;
}

.toggle-pwd:hover {
    color: #cbd5e1;
    background: rgba(148, 163, 184, 0.12);
}

.toggle-pwd svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.capslock-hint {
    display: none;
    margin-top: 6px;
    font-size: 12px;
    color: #f59e0b;
}

.capslock-hint.show {
    display: block;
}

.error-msg {
    display: none;
    background: rgba(220, 38, 38, 0.14);
    border: 1px solid rgba(220, 38, 38, 0.4);
    color: #fca5a5;
    font-size: 13px;
    line-height: 1.5;
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 18px;
}

.submit-btn {
    width: 100%;
    padding: 13px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 4px;
    color: #ffffff;
    background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
}

.submit-btn:hover:not(:disabled) {
    opacity: 0.9;
}

.submit-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.demo-tip {
    margin-top: 22px;
    padding-top: 16px;
    border-top: 1px dashed rgba(148, 163, 184, 0.2);
    font-size: 12px;
    color: #64748b;
    text-align: center;
    line-height: 1.6;
}

.success-panel {
    display: none;
    text-align: center;
    padding: 10px 0;
}

.success-panel .check-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(34, 197, 94, 0.15);
    border: 2px solid rgba(34, 197, 94, 0.5);
}

.success-panel .check-icon svg {
    width: 36px;
    height: 36px;
    stroke: #22c55e;
    stroke-width: 3;
    fill: none;
}

.success-panel h2 {
    font-size: 20px;
    margin-bottom: 8px;
}

.success-panel p {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.7;
}

.back-btn {
    margin-top: 24px;
    padding: 10px 28px;
    font-size: 14px;
    color: #cbd5e1;
    background: transparent;
    border: 1px solid rgba(148, 163, 184, 0.35);
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.back-btn:hover {
    background: rgba(148, 163, 184, 0.12);
}

@media (max-width: 480px) {
    .admin-card {
        padding: 32px 22px 24px;
    }
}