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

:root {
    /* Soft Pastel Colors */
    --color-bg: #faf8f5;
    --color-bg-work: #fff5f5;
    --color-bg-short-break: #f0fff4;
    --color-bg-long-break: #f0f9ff;
    
    --color-primary: #ff6b6b;
    --color-primary-light: #ff8787;
    --color-primary-dark: #fa5252;
    
    --color-secondary: #51cf66;
    --color-secondary-light: #69db7c;
    --color-tertiary: #339af0;
    --color-tertiary-light: #4dabf7;
    
    --color-text: #495057;
    --color-text-light: #868e96;
    --color-text-muted: #adb5bd;
    
    --color-white: #ffffff;
    --color-card: #ffffff;
    --color-border: #e9ecef;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    transition: background-color var(--transition-slow);
}

body.mode-work {
    background-color: var(--color-bg-work);
}

body.mode-short-break {
    background-color: var(--color-bg-short-break);
}

body.mode-long-break {
    background-color: var(--color-bg-long-break);
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 480px;
    background: var(--color-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 32px;
    transition: transform var(--transition-normal);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 28px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.mode-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    background: var(--color-bg);
    padding: 4px;
    border-radius: var(--radius-full);
}

.mode-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--color-text-light);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.mode-btn.active {
    background: var(--color-white);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
}

/* Timer Section */
.timer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 28px;
}

.timer-circle {
    position: relative;
    width: 240px;
    height: 240px;
    margin-bottom: 24px;
}

.progress-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--color-border);
    stroke-width: 6;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1s linear, stroke var(--transition-normal);
}

body.mode-work .progress-ring-fill {
    stroke: var(--color-primary);
}

body.mode-short-break .progress-ring-fill {
    stroke: var(--color-secondary);
}

body.mode-long-break .progress-ring-fill {
    stroke: var(--color-tertiary);
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.time {
    display: block;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -2px;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.mode-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: 8px;
    font-weight: 500;
}

/* Timer Controls */
.timer-controls {
    display: flex;
    gap: 16px;
    align-items: center;
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.control-btn.primary {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 16px rgba(255, 107, 107, 0.4);
}

.control-btn.primary:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.5);
}

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

body.mode-work .control-btn.primary {
    background: var(--color-primary);
    box-shadow: 0 4px 16px rgba(255, 107, 107, 0.4);
}

body.mode-short-break .control-btn.primary {
    background: var(--color-secondary);
    box-shadow: 0 4px 16px rgba(81, 207, 102, 0.4);
}

body.mode-long-break .control-btn.primary {
    background: var(--color-tertiary);
    box-shadow: 0 4px 16px rgba(51, 154, 240, 0.4);
}

.control-btn.secondary {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-bg);
    color: var(--color-text-light);
}

.control-btn.secondary:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.control-btn svg {
    width: 28px;
    height: 28px;
}

.control-btn.secondary svg {
    width: 20px;
    height: 20px;
}

.hidden {
    display: none !important;
}

/* Task Section */
.task-section {
    margin-bottom: 24px;
}

.task-input-wrapper {
    position: relative;
}

#taskInput {
    width: 100%;
    padding: 14px 48px 14px 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-white);
    transition: all var(--transition-fast);
}

#taskInput::placeholder {
    color: var(--color-text-muted);
}

#taskInput:focus {
    outline: none;
    border-color: var(--color-primary-light);
}

body.mode-work #taskInput:focus {
    border-color: var(--color-primary-light);
}

body.mode-short-break #taskInput:focus {
    border-color: var(--color-secondary-light);
}

body.mode-long-break #taskInput:focus {
    border-color: var(--color-tertiary-light);
}

.task-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    opacity: 0.6;
    pointer-events: none;
}

.current-task {
    margin-top: 12px;
    padding: 12px 16px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--color-text-light);
    display: none;
}

.current-task.show {
    display: block;
}

.current-task::before {
    content: '🎯 ';
}

/* Stats Section */
.stats-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--color-bg);
    padding: 16px 12px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: transform var(--transition-fast);
}

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

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

/* History Section */
.history-section {
    margin-bottom: 8px;
}

.section-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
}

.history-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.history-tab {
    padding: 6px 14px;
    border: none;
    background: transparent;
    color: var(--color-text-light);
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-tab:hover {
    color: var(--color-text);
    background: var(--color-bg);
}

.history-tab.active {
    background: var(--color-text);
    color: var(--color-white);
}

.history-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 8px;
    height: 120px;
    padding: 16px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
}

.chart-bar {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

.bar-fill {
    width: 100%;
    max-width: 32px;
    background: var(--color-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: height var(--transition-normal);
    min-height: 4px;
}

.bar-fill.work {
    background: var(--color-primary);
}

.bar-fill.break {
    background: var(--color-secondary);
}

.bar-label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.history-legend {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--color-text-light);
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.legend-dot.work {
    background: var(--color-primary);
}

.legend-dot.break {
    background: var(--color-secondary);
}

/* Footer */
.footer {
    text-align: center;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

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

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.timer-running .time {
    animation: pulse 2s ease-in-out infinite;
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 12px;
    }
    
    .app-container {
        padding: 24px 20px;
    }
    
    .timer-circle {
        width: 200px;
        height: 200px;
    }
    
    .time {
        font-size: 3rem;
    }
    
    .mode-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }
}

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