/* Pretendard Font */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

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

:root {
    --bg-primary: #171717;
    --bg-secondary: #1f1f1f;
    --bg-tertiary: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-primary: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: rgba(96, 165, 250, 0.1);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-color: #333333;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo svg {
    color: var(--accent-primary);
}

.logo h1 {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.icon-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* Status Card */
.status-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 24px;
    position: relative;
    overflow: hidden;
}

.status-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), #a78bfa);
}

.status-icon {
    font-size: 64px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.status-text {
    flex: 1;
}

.status-text h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

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

.timer-display {
    text-align: right;
}

.time-large {
    font-size: 48px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--accent-primary);
    text-shadow: 0 2px 10px rgba(96, 165, 250, 0.3);
}

.time-label {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 4px;
}

/* Control Panel */
.control-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.setting-group {
    margin-bottom: 24px;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.setting-group label svg {
    color: var(--accent-primary);
}

/* Input Controls */
.input-with-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.control-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

#intervalInput {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-family: inherit;
    text-align: center;
    font-weight: 600;
}

#intervalInput:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.quick-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.quick-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.quick-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

/* Volume Control */
.volume-control {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.volume-icon {
    background: transparent;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}

.volume-icon:hover {
    transform: scale(1.1);
}

#volumeSlider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-primary);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

#volumeSlider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    transition: all 0.2s;
}

#volumeSlider::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.2);
}

#volumeSlider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

#volumeSlider::-moz-range-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.2);
}

#volumeValue {
    min-width: 45px;
    text-align: right;
    font-weight: 600;
    color: var(--accent-primary);
    font-size: 14px;
}

.test-sound-btn {
    background: var(--accent-primary);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

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

.test-sound-btn:active {
    transform: translateY(0);
}

/* Toggle Switch */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toggle-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.toggle {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    transition: 0.3s;
    border-radius: 26px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

input:checked + .slider:before {
    transform: translateX(24px);
    background-color: white;
}

/* Action Buttons */
.action-buttons {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 12px;
    margin-top: 24px;
}

.btn {
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: #d97706;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Statistics Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.2s;
}

.stat-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    font-size: 32px;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* History Section */
.history-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
}

.section-header svg {
    color: var(--accent-primary);
}

.text-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: color 0.2s;
}

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

.history-list {
    max-height: 300px;
    overflow-y: auto;
}

.history-list::-webkit-scrollbar {
    width: 8px;
}

.history-list::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.history-icon {
    font-size: 24px;
}

.history-content {
    flex: 1;
}

.history-time {
    font-weight: 600;
    color: var(--text-primary);
}

.history-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 14px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: modalFadeIn 0.3s ease;
    backdrop-filter: blur(4px);
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    animation: modalSlideIn 0.3s ease;
    box-shadow: var(--shadow-lg);
}

@keyframes modalSlideIn {
    from { 
        opacity: 0;
        transform: translateY(-30px) scale(0.9);
    }
    to { 
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.modal-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.modal-actions .btn {
    flex: 1;
    padding: 12px 20px;
}

/* Footer */
footer {
    text-align: center;
    padding: 24px 0;
    color: var(--text-secondary);
    font-size: 13px;
    border-top: 1px solid var(--border-color);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }

    header {
        padding: 16px 0;
        margin-bottom: 24px;
    }

    .logo h1 {
        font-size: 20px;
    }

    .status-card {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

    .timer-display {
        text-align: center;
    }

    .time-large {
        font-size: 36px;
    }

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

    .action-buttons {
        grid-template-columns: 1fr;
    }

    .quick-actions {
        grid-template-columns: repeat(3, 1fr);
    }

    .modal-content {
        padding: 24px;
    }

    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .status-icon {
        font-size: 48px;
    }

    .status-text h2 {
        font-size: 20px;
    }

    .time-large {
        font-size: 32px;
    }

    .stat-value {
        font-size: 24px;
    }

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

/* Notification Badge Animation */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.notification-badge {
    animation: shake 0.5s ease;
}