/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --accent-color: #10b981;
    --accent-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --success-color: #22c55e;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-elevated: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    text-align: center;
    padding: 40px 0 30px;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 1rem;
}

/* Main */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Input Section */
.input-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.input-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.input-wrapper input {
    flex: 1;
    padding: 14px 18px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface-elevated);
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.icon-btn {
    width: 50px;
    height: 50px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--surface-elevated);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    font-size: 1.2rem;
}

.icon-btn:hover {
    border-color: var(--primary-color);
    background: var(--surface);
}

.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn.primary {
    background: var(--primary-color);
    color: white;
}

.btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn.secondary {
    background: var(--secondary-color);
    color: white;
}

.btn.secondary:hover {
    background: var(--secondary-hover);
    transform: translateY(-1px);
}

.btn.accent {
    background: var(--accent-color);
    color: white;
}

.btn.accent:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn.danger {
    background: transparent;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
}

.btn.danger:hover {
    background: var(--danger-color);
    color: white;
}

.btn.small {
    padding: 8px 16px;
    font-size: 0.85rem;
}

/* Result Sections */
.result-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.result-section.hidden {
    display: none;
}

.result-section h2 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.badge {
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 12px;
    font-weight: 600;
}

/* Strength Meter */
.strength-meter {
    height: 12px;
    background: var(--surface-elevated);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 12px;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.5s ease, background 0.3s ease;
    border-radius: 6px;
}

.strength-bar.weak { background: var(--danger-color); }
.strength-bar.fair { background: var(--warning-color); }
.strength-bar.good { background: #84cc16; }
.strength-bar.strong { background: var(--success-color); }
.strength-bar.excellent { background: linear-gradient(90deg, var(--success-color), var(--accent-color)); }

.strength-label {
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Analysis Grid */
.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
}

.analysis-card {
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    padding: 20px;
    text-align: center;
    transition: transform var(--transition);
}

.analysis-card:hover {
    transform: translateY(-2px);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.analysis-card h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.analysis-card .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.analysis-card .description {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Criteria List */
.criteria-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.criteria-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.criteria-list li.passed {
    background: rgba(34, 197, 94, 0.15);
    border-left: 3px solid var(--success-color);
}

.criteria-list li.failed {
    background: rgba(239, 68, 68, 0.15);
    border-left: 3px solid var(--danger-color);
}

.check-icon {
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.criteria-list li.passed .check-icon { color: var(--success-color); }
.criteria-list li.failed .check-icon { color: var(--danger-color); }

/* Breach Section */
.breach-result {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
}

.breach-icon {
    font-size: 2.5rem;
}

.breach-message {
    font-size: 1.1rem;
    font-weight: 500;
}

.breach-result.safe {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid var(--success-color);
}

.breach-result.breached {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger-color);
}

.breach-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

/* Suggestions */
.suggestions-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.suggestions-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 16px;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--warning-color);
}

.suggestions-list li::before {
    content: '💡';
}

/* Generated Password */
.generated-password-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.generated-password {
    flex: 1;
    min-width: 200px;
    padding: 14px 18px;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    word-break: break-all;
    color: var(--accent-color);
}

.generator-options {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.generator-options label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.generator-options input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.generator-options input[type="range"] {
    width: 100px;
    accent-color: var(--primary-color);
}

/* Saved Passwords */
.saved-passwords-container {
    margin-bottom: 16px;
}

.saved-empty, .history-empty {
    text-align: center;
    padding: 30px;
    color: var(--text-muted);
}

.saved-empty .note, .history-empty .note {
    font-size: 0.85rem;
    margin-top: 8px;
}

.saved-list, .history-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 300px;
    overflow-y: auto;
}

.saved-item, .history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--surface-elevated);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.saved-item:hover, .history-item:hover {
    background: var(--border-color);
}

.saved-item-content, .history-item-content {
    flex: 1;
    min-width: 0;
}

.saved-item-name {
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.saved-item-password {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.saved-item-date, .history-item-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.history-item-password {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.history-item-score {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-item-score .score-badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.score-badge.weak { background: var(--danger-color); color: white; }
.score-badge.fair { background: var(--warning-color); color: black; }
.score-badge.good { background: #84cc16; color: black; }
.score-badge.strong { background: var(--success-color); color: white; }
.score-badge.excellent { background: var(--accent-color); color: white; }

.saved-item-actions, .history-item-actions {
    display: flex;
    gap: 8px;
}

.saved-item-actions button, .history-item-actions button {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition);
}

.saved-item-actions button:hover, .history-item-actions button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.saved-item-actions button.delete:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.saved-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface-elevated);
    color: var(--text-primary);
    padding: 14px 24px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.info {
    border-left: 4px solid var(--primary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.footer-note {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header {
        padding: 30px 0 20px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .logo-container {
        flex-direction: column;
        gap: 10px;
    }

    .input-section {
        padding: 20px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .analysis-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .criteria-list {
        grid-template-columns: 1fr;
    }

    .generated-password-container {
        flex-direction: column;
        align-items: stretch;
    }

    .generated-password {
        text-align: center;
    }

    .generator-options {
        justify-content: center;
    }

    .saved-item, .history-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .saved-item-actions, .history-item-actions {
        width: 100%;
        justify-content: flex-end;
        margin-top: 10px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.3rem;
    }

    .analysis-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .analysis-card {
        padding: 15px;
    }

    .analysis-card .value {
        font-size: 1.2rem;
    }

    .result-section {
        padding: 18px;
    }
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-section:not(.hidden) {
    animation: fadeIn 0.3s ease;
}