:root {
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.2);
}

/* DARK THEME */
[data-theme="dark"] {
    --bg-root: #0D0D0F;
    --bg-panel: #161618;
    --bg-panel2: #1C1C1F;
    --bg-card: #222226;
    --bg-input: #1C1C1F;
    --bg-hover: #28282D;
    --border: rgba(255, 255, 255, 0.07);
    --border-active: rgba(249, 115, 22, 0.5);
    --text-primary: #F5F0EB;
    --text-secondary: #A89880;
    --text-muted: #5A5048;
    --accent: #F97316;
    --accent-2: #FB923C;
    --accent-glow: rgba(249, 115, 22, 0.22);
    --accent-btn: linear-gradient(135deg, #EA580C 0%, #FB923C 100%);
    --focus-color: #22C55E;
    --short-color: #38BDF8;
    --long-color: #EF4444;
    --danger: #F87171;
    --ring-track: rgba(255, 255, 255, 0.06);
    --header-bg: rgba(13, 13, 15, 0.88);
}

/* LIGHT THEME */
[data-theme="light"] {
    --bg-root: #FFF8F2;
    --bg-panel: #FFFFFF;
    --bg-panel2: #FFF3EA;
    --bg-card: #FFEDE0;
    --bg-input: #FFF8F2;
    --bg-hover: #FFEDE0;
    --border: rgba(0, 0, 0, 0.07);
    --border-active: rgba(234, 88, 12, 0.4);
    --text-primary: #1C1008;
    --text-secondary: #5C3D1E;
    --text-muted: #A07850;
    --accent: #EA580C;
    --accent-2: #C2410C;
    --accent-glow: rgba(234, 88, 12, 0.12);
    --accent-btn: linear-gradient(135deg, #C2410C 0%, #F97316 100%);
    --focus-color: #16A34A;
    --short-color: #38BDF8;
    --long-color: #DC2626;
    --danger: #DC2626;
    --ring-track: rgba(0, 0, 0, 0.07);
    --header-bg: rgba(255, 248, 242, 0.92);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-root);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition), color var(--transition);
    line-height: 1.6;
}

/* Subtle ambient blobs */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    filter: blur(90px);
    opacity: 0.12;
}

body::before {
    width: 520px;
    height: 520px;
    background: var(--focus-color);
    top: -160px;
    left: -120px;
}

body::after {
    width: 420px;
    height: 420px;
    background: var(--short-color);
    bottom: -100px;
    right: -80px;
}


.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.header-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 28px;
    height: 66px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon-wrap {
    width: 36px;
    height: 36px;
    background: var(--accent-btn);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.logo-icon-wrap svg {
    color: #fff;
}

.logo-text {
    font-size: 1.22rem;
    font-weight: 800;
    letter-spacing: -0.035em;
    color: var(--text-primary);
    transition: color var(--transition);
}

.logo-text span {
    color: var(--accent);
}

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

.daily-badge {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--accent-glow);
    border: 1px solid var(--border-active);
    color: var(--accent-2);
    font-size: 0.78rem;
    font-weight: 700;
    padding: 5px 13px;
    border-radius: 100px;
    cursor: default;
    white-space: nowrap;
}

.theme-toggle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-panel);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--bg-hover);
    border-color: var(--border-active);
    transform: rotate(15deg) scale(1.05);
}

.theme-icon {
    position: absolute;
    transition: all 0.3s;
}

[data-theme="dark"] .theme-icon.sun {
    opacity: 1;
    transform: scale(1);
}

[data-theme="dark"] .theme-icon.moon {
    opacity: 0;
    transform: scale(0.3) rotate(-90deg);
}

[data-theme="light"] .theme-icon.sun {
    opacity: 0;
    transform: scale(0.3) rotate(90deg);
}

[data-theme="light"] .theme-icon.moon {
    opacity: 1;
    transform: scale(1);
}


.main-layout {
    flex: 1;
    max-width: 1120px;
    width: 100%;
    margin: 0 auto;
    padding: 40px 28px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    position: relative;
    z-index: 1;
}

/* TIMER PANEL */
.timer-panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 26px;
    box-shadow: var(--shadow-md);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.timer-panel:hover {
    box-shadow: var(--shadow-lg);
}

/* Mode tabs row (tabs + gear) */
.mode-tabs-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.mode-tabs-row .mode-tabs {
    flex: 1;
}

.btn-icon-sm {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    border-radius: 10px;
}

.btn-icon-sm.active-settings {
    background: var(--accent-glow);
    border-color: var(--border-active);
    color: var(--accent);
}

/* Collapsible Settings Row */
.settings-row {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    animation: settingsSlide 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes settingsSlide {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.setting-field {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.setting-label {
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.setting-input-wrap {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 5px 10px;
    transition: all var(--transition);
}

.setting-input-wrap:focus-within {
    border-color: var(--border-active);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.setting-input {
    width: 48px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
    outline: none;
    appearance: textfield;
    -moz-appearance: textfield;
}

.setting-input::-webkit-outer-spin-button,
.setting-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.setting-unit {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
}

.setting-sep {
    color: var(--text-muted);
    font-size: 1.1rem;
    padding-top: 18px;
}

/* Mode Tabs */

.mode-tabs {
    display: flex;
    gap: 5px;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 5px;
    width: 100%;
}

.mode-tab {
    flex: 1;
    padding: 9px 8px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

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

.mode-tab.active {
    background: var(--accent-btn);
    color: #fff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

/* Circular Ring Timer */
.timer-ring-container {
    position: relative;
    width: 230px;
    height: 230px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timer-ring {
    position: absolute;
    top: 0;
    left: 0;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--ring-track);
    stroke-width: 7;
}

.ring-progress {
    fill: none;
    stroke: var(--focus-color);
    stroke-width: 7;
    stroke-linecap: round;
    stroke-dasharray: 659;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear, stroke 0.5s ease;
    filter: drop-shadow(0 0 10px var(--accent-glow));
}

/* Break ring colors */
[data-mode="shortBreak"] .ring-progress {
    stroke: var(--short-color);
    filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.4));
}

[data-mode="longBreak"] .ring-progress {
    stroke: var(--long-color);
    filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.4));
}

.timer-center {
    position: relative;
    z-index: 2;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    max-width: 150px;
    width: 100%;
}

.session-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-2);
}

.timer-display {
    font-family: var(--font-mono);
    font-size: 3.4rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    line-height: 1;
    transition: color var(--transition);
}

.session-counter {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Ring pulse while running */
.timer-ring-container.running .ring-progress {
    animation: ringPulse 2s ease-in-out infinite;
}

@keyframes ringPulse {

    0%,
    100% {
        filter: drop-shadow(0 0 6px var(--accent-glow));
    }

    50% {
        filter: drop-shadow(0 0 20px var(--accent-glow));
    }
}

/* Currently Working On */
.working-on {
    width: 100%;
    background: var(--accent-glow);
    border: 1px solid var(--border-active);
    border-radius: var(--radius-md);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    flex-wrap: wrap;
}

.working-on-label {
    color: var(--text-muted);
    font-weight: 500;
    white-space: nowrap;
}

.working-on-task {
    color: var(--accent-2);
    font-weight: 700;
    font-size: 0.85rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 200px;
}

/* Controls */
.timer-controls {
    display: flex;
    align-items: center;
    gap: 14px;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    outline: none;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: opacity var(--transition);
}

.btn:hover::after {
    opacity: 1;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--accent-btn);
    color: #fff;
    font-size: 1rem;
    padding: 14px 38px;
    border-radius: 100px;
    box-shadow: 0 6px 22px var(--accent-glow);
    min-width: 148px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px var(--accent-glow);
}

.btn-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-active);
    transform: scale(1.08);
}

.btn-add {
    background: var(--accent-btn);
    color: #fff;
    font-size: 0.88rem;
    padding: 11px 18px;
    border-radius: var(--radius-md);
    gap: 6px;
    white-space: nowrap;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px var(--accent-glow);
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
}

.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.3);
}

.btn-sm {
    font-size: 0.78rem;
    padding: 6px 14px;
}

.hidden {
    display: none !important;
}

/* TASKS PANEL */
.tasks-panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    box-shadow: var(--shadow-md);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.tasks-panel:hover {
    box-shadow: var(--shadow-lg);
}

.tasks-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.tasks-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.tasks-count {
    font-size: 0.74rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    padding: 3px 11px;
    border-radius: 100px;
}

/* Add Task Row */
.add-task-row {
    display: flex;
    gap: 10px;
}

.task-input {
    flex: 1;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    padding: 11px 16px;
    outline: none;
    transition: all var(--transition);
}

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

.task-input:focus {
    border-color: var(--border-active);
    background: var(--bg-hover);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Task List */
.task-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 9px;
    flex: 1;
    overflow-y: auto;
    max-height: 370px;
    padding-right: 3px;
}

.task-list::-webkit-scrollbar {
    width: 4px;
}

.task-list::-webkit-scrollbar-track {
    background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--border-active);
    border-radius: 4px;
}

/* Task Item */
.task-item {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-panel2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    cursor: pointer;
    transition: all var(--transition);
    animation: slideIn 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.task-item:hover {
    border-color: var(--border-active);
    background: var(--bg-hover);
    transform: translateX(3px);
}

.task-item.active-task {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.task-item.active-task::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 3px;
    background: var(--accent-btn);
    border-radius: 3px;
}

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

.task-item.completed .task-name {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Custom Checkbox */
.task-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-active);
    border-radius: 6px;
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--transition);
    background: transparent;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.task-checkbox:checked {
    background: var(--accent-btn);
    border-color: transparent;
}

.task-checkbox:checked::after {
    content: '✓';
    color: #fff;
    font-size: 11px;
    font-weight: 800;
    position: absolute;
}

.task-checkbox:hover {
    border-color: var(--accent);
    transform: scale(1.1);
}

.task-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.task-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition);
}

.task-pomodoros {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-2);
    display: flex;
    align-items: center;
    gap: 3px;
}

.task-delete {
    width: 30px;
    height: 30px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
    opacity: 0;
}

.task-item:hover .task-delete {
    opacity: 1;
}

.task-delete:hover {
    background: rgba(239, 68, 68, 0.14);
    color: var(--danger);
    transform: scale(1.12);
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 44px 20px;
    text-align: center;
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 3rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

.empty-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.empty-sub {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.task-actions {
    display: flex;
    justify-content: flex-end;
}

.task-actions.hidden {
    display: none;
}

/* FOOTER */
.site-footer {
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    padding: 18px 28px;
    position: relative;
    z-index: 1;
    transition: background var(--transition);
}

.footer-inner {
    max-width: 1120px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-stats {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.stat-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.footer-brand {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* TOAST */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(16px);
    background: var(--bg-panel);
    border: 1px solid var(--border-active);
    color: var(--text-primary);
    padding: 12px 26px;
    border-radius: 100px;
    font-size: 0.88rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    white-space: nowrap;
    backdrop-filter: blur(12px);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* RESPONSIVE */
@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
        padding: 24px 20px;
        gap: 20px;
    }
}

@media (max-width: 520px) {
    .header-inner {
        padding: 0 16px;
        height: 58px;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .daily-badge {
        display: none;
    }

    .timer-display {
        font-size: 2.8rem;
    }

    .timer-ring-container {
        width: 200px;
        height: 200px;
    }

    .timer-ring {
        width: 200px !important;
        height: 200px !important;
    }

    .mode-tab {
        font-size: 0.74rem;
        padding: 8px 4px;
    }

    .btn-primary {
        padding: 12px 28px;
        min-width: 130px;
        font-size: 0.95rem;
    }

    .timer-panel {
        padding: 26px 20px;
        gap: 20px;
    }

    .tasks-panel {
        padding: 24px 18px;
    }

    .main-layout {
        padding: 16px 14px;
        gap: 16px;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-stats {
        flex-direction: column;
        gap: 6px;
    }
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible {
    box-shadow: 0 0 0 3px var(--accent-glow);
}