/* ========================================
   S3 File Explorer - Login Dark Mode
   ======================================== */

:root {
    /* Background Scale */
    --bg-base: #0d0d0d;
    --bg-surface: #141414;
    --bg-elevated: #1a1a1a;
    --bg-hover: #242424;

    /* Primary - Cyan */
    --primary-400: #22d3ee;
    --primary-500: #06b6d4;
    --primary-600: #0891b2;
    --primary-glow: rgba(6, 182, 212, 0.15);

    /* Text */
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;
    --text-inverse: #0d0d0d;

    /* Borders */
    --border-subtle: #1f1f1f;
    --border-default: #2a2a2a;
    --border-strong: #3a3a3a;

    /* Semantic */
    --danger: #ef4444;
    --danger-muted: rgba(239, 68, 68, 0.15);

    /* Shadows */
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 30px var(--primary-glow);

    /* Spacing */
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;

    /* Radius */
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', sans-serif;
    background: var(--bg-base);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-5);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle grid pattern background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.login-container {
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header {
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-8);
    text-align: center;
}

.login-header .logo {
    color: var(--primary-500);
    margin-bottom: var(--space-4);
    filter: drop-shadow(0 0 12px var(--primary-glow));
}

.login-header h1 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.login-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

#login-form {
    padding: var(--space-8);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-2);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-base);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-glow);
    background: var(--bg-surface);
}

.login-btn {
    width: 100%;
    padding: var(--space-3) var(--space-6);
    background: var(--primary-500);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: inherit;
}

.login-btn:hover:not(:disabled) {
    background: var(--primary-400);
    box-shadow: 0 0 24px var(--primary-glow);
    transform: translateY(-2px);
}

.login-btn:active:not(:disabled) {
    transform: translateY(0);
    background: var(--primary-600);
}

.login-btn:focus-visible {
    outline: 2px solid var(--primary-400);
    outline-offset: 2px;
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    animation: spin 0.8s linear infinite;
}

.spinner.hidden {
    display: none;
}

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

.error-message {
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--danger-muted);
    color: var(--danger);
    border-radius: var(--radius-md);
    font-size: 14px;
    display: none;
    animation: shake 0.4s ease;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.error-message.show {
    display: block;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

.login-footer {
    padding: var(--space-4) var(--space-8);
    background: var(--bg-elevated);
    color: var(--text-muted);
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border-top: 1px solid var(--border-subtle);
}

.login-footer svg {
    color: var(--primary-500);
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 0;
        align-items: stretch;
    }

    .login-container {
        max-width: 100%;
        display: flex;
        flex-direction: column;
        min-height: 100vh;
    }

    .login-box {
        border-radius: 0;
        flex: 1;
        display: flex;
        flex-direction: column;
        border: none;
    }

    #login-form {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}