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

:root {
    /* Pomodoro (red theme) */
    --color-primary: #dc4a3f;
    --color-primary-dark: #c0392b;
    --color-primary-light: #e74c3c;
    --color-bg: #e8e4e1;
    --color-surface: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #ddd5d0;
    --color-success: #27ae60;
    --color-shadow: rgba(0,0,0,0.08);

    /* Short Break (green) */
    --color-short: #27ae60;
    --color-short-dark: #1e8449;
    --color-short-bg: #d5f5e3;

    /* Long Break (blue) */
    --color-long: #2980b9;
    --color-long-dark: #1a5276;
    --color-long-bg: #d6eaf8;

    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
}

/* Mode themes */
body.mode-shortBreak {
    --color-primary: var(--color-short);
    --color-primary-dark: var(--color-short-dark);
    --color-bg: var(--color-short-bg);
}

body.mode-longBreak {
    --color-primary: var(--color-long);
    --color-primary-dark: var(--color-long-dark);
    --color-bg: var(--color-long-bg);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    transition: background var(--transition);
    overflow-x: hidden;
}

/* ===== Top Bar ===== */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    max-width: 640px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
    transition: color var(--transition);
}

.logo-icon {
    font-size: 28px;
}

.nav-actions {
    display: flex;
    gap: 8px;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    display: flex;
    align-items: center;
}

.nav-btn:hover {
    background: rgba(0,0,0,0.06);
    color: var(--color-primary);
}

/* ===== Main Content ===== */
.main-content {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 24px 24px;
    text-align: center;
}

/* ===== Mode Tabs ===== */
.mode-tabs {
    display: flex;
    gap: 4px;
    background: rgba(0,0,0,0.04);
    border-radius: var(--radius);
    padding: 4px;
    margin-bottom: 32px;
}

.mode-tab {
    flex: 1;
    padding: 10px 8px;
    border: none;
    background: transparent;
    color: var(--color-text-light);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

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

.mode-tab.active {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: 0 1px 3px var(--color-shadow);
}

/* ===== Timer ===== */
.timer-container {
    margin-bottom: 24px;
}

.timer-ring {
    position: relative;
    width: 260px;
    height: 260px;
    margin: 0 auto;
}

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

.timer-bg {
    fill: none;
    stroke: rgba(0,0,0,0.06);
    stroke-width: 6;
}

.timer-progress {
    fill: none;
    stroke: var(--color-primary);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 879.6;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.5s linear, stroke var(--transition);
}

.timer-display {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 72px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -2px;
    font-variant-numeric: tabular-nums;
}

/* ===== Controls ===== */
.timer-controls {
    margin-bottom: 20px;
}

.btn-start {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 14px 56px;
    font-size: 18px;
    font-weight: 700;
    border-radius: var(--radius);
    cursor: pointer;
    letter-spacing: 2px;
    transition: all var(--transition);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-start:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

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

.btn-start.running {
    background: var(--color-text-light);
}

/* ===== Current Task ===== */
.current-task {
    margin-bottom: 36px;
    min-height: 28px;
}

.task-label {
    color: var(--color-text-light);
    font-size: 15px;
}

/* ===== Tasks Section ===== */
.tasks-section {
    background: transparent;
    border-radius: 0;
    padding: 0;
    box-shadow: none;
    text-align: left;
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
}

.tasks-header h2 {
    font-size: 18px;
    font-weight: 600;
}

.btn-clear-done {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 13px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background var(--transition);
}

.btn-clear-done:hover {
    background: rgba(0,0,0,0.04);
}

.task-input-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.task-input-row input {
    flex: 1;
    padding: 10px 14px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition);
    background: transparent;
}

.task-input-row input:focus {
    border-color: var(--color-primary);
}

.btn-add-task {
    background: var(--color-primary);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
    flex-shrink: 0;
}

.btn-add-task:hover {
    background: var(--color-primary-dark);
}

.task-list {
    list-style: none;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    transition: opacity 0.3s;
}

.task-item:last-child {
    border-bottom: none;
}

.task-item.done {
    opacity: 0.5;
}

.task-item.done .task-text {
    text-decoration: line-through;
}

.task-checkbox {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
}

.task-checkbox:hover {
    border-color: var(--color-primary);
}

.task-checkbox.checked {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.task-checkbox.checked::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: 700;
}

.task-text {
    flex: 1;
    font-size: 14px;
}

.task-pomo-count {
    display: flex;
    align-items: center;
    gap: 2px;
}

.pomo-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--color-primary);
    transition: background var(--transition);
}

.pomo-dot.filled {
    background: var(--color-primary);
}

.task-actions {
    display: flex;
    gap: 4px;
}

.task-action-btn {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    font-size: 14px;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: all var(--transition);
}

.task-item:hover .task-action-btn {
    opacity: 1;
}

.task-action-btn:hover {
    color: var(--color-primary);
    background: rgba(0,0,0,0.04);
}

.task-estimate {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 13px;
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
}

.modal-content {
    position: relative;
    background: var(--color-surface);
    border-radius: var(--radius);
    width: 90%;
    max-width: 480px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: 18px;
}

.btn-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    line-height: 1;
}

.btn-close:hover {
    background: rgba(0,0,0,0.06);
}

/* ===== Settings ===== */
.settings-body {
    padding: 20px 24px;
}

.settings-body h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    margin-top: 20px;
}

.settings-body h3:first-child {
    margin-top: 0;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.setting-row label {
    font-size: 14px;
}

.setting-row input[type="number"],
.setting-row select {
    width: 80px;
    padding: 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    text-align: center;
}

.setting-row input[type="number"]:focus,
.setting-row select:focus {
    border-color: var(--color-primary);
}

.setting-row input[type="range"] {
    width: 120px;
    accent-color: var(--color-primary);
}

.toggle-row {
    padding: 12px 0;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-border);
    border-radius: 24px;
    transition: var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
}

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

.toggle input:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    text-align: right;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 10px 32px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
}

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

/* ===== Report ===== */
.report-body {
    padding: 24px;
}

.report-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}

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

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

.report-chart h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: 12px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 120px;
    padding: 0 8px;
}

.chart-bar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    height: 100%;
}

.chart-bar {
    width: 100%;
    max-width: 32px;
    background: var(--color-primary);
    border-radius: 4px 4px 0 0;
    transition: height 0.5s ease;
    min-height: 0;
    margin-top: auto;
}

.chart-day {
    font-size: 11px;
    color: var(--color-text-light);
}

/* ===== Empty State ===== */
.task-empty {
    text-align: center;
    padding: 20px 0;
    color: var(--color-text-light);
    font-size: 14px;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .top-bar {
        padding: 12px 16px;
    }

    .main-content {
        padding: 0 16px 32px;
    }

    .mode-tab {
        font-size: 12px;
        padding: 8px 4px;
    }

    .timer-ring {
        width: 220px;
        height: 220px;
    }

    .timer-display {
        font-size: 56px;
    }

    .btn-start {
        padding: 12px 44px;
        font-size: 16px;
    }

    .tasks-section {
        padding: 16px;
    }

    .setting-row input[type="number"],
    .setting-row select {
        width: 70px;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0,0,0,0.15);
    border-radius: 3px;
}

/* ===== Selection ===== */
::selection {
    background: var(--color-primary);
    color: white;
}

/* ===== SEO Content (pomofocus.io style) ===== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.seo-content {
    background: #ffffff;
    margin-top: 0;
    padding: 60px 24px;
}

.seo-wrapper {
    max-width: 680px;
    margin: 0 auto;
}

.seo-wrapper h1 {
    font-size: 30px;
    font-weight: 700;
    color: #541c1f;
    line-height: 1.4;
    margin-bottom: 48px;
}

.seo-wrapper article {
    margin-bottom: 42px;
}

.seo-wrapper article:last-child {
    margin-bottom: 0;
}

.seo-wrapper h2 {
    font-size: 22px;
    font-weight: 700;
    color: #541c1f;
    margin-bottom: 20px;
    padding-bottom: 12px;
    position: relative;
}

.seo-wrapper h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 32px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
}

.seo-wrapper p {
    font-size: 16px;
    line-height: 1.7;
    color: #787878;
    margin-bottom: 16px;
}

.seo-wrapper p:last-child {
    margin-bottom: 0;
}

.seo-wrapper strong {
    color: #541c1f;
    font-weight: 600;
}

.seo-wrapper a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: opacity 0.2s;
}

.seo-wrapper a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.seo-wrapper ol,
.seo-wrapper ul {
    padding-left: 20px;
    margin: 0 0 16px 0;
}

.seo-wrapper ol li,
.seo-wrapper ul li {
    font-size: 16px;
    line-height: 1.7;
    color: #787878;
    margin-bottom: 10px;
}

.seo-wrapper ol li:last-child,
.seo-wrapper ul li:last-child {
    margin-bottom: 0;
}

/* ===== Footer ===== */
.site-footer {
    background: #ffffff;
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid #f0e6e6;
}

.site-footer p {
    font-size: 14px;
    color: #787878;
    line-height: 1.8;
    margin: 0;
}

.site-footer strong {
    color: #541c1f;
}