/* ===== CSS Variables & Themes ===== */
:root {
    /* Light Theme (Default) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --accent: #6366f1;
    --accent-light: rgba(99, 102, 241, 0.1);
    --accent-hover: #4f46e5;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.5);
    --gradient-start: #e0e7ff;
    --gradient-end: #fce7f3;
    --overlay-bg: rgba(255, 255, 255, 0.1);
    /* Custom colors (can be overridden) */
    --timer-text: #0f172a;
    --ring-color: #6366f1;
    --custom-border: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(30, 41, 59, 0.9);
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient-start: #1e1b4b;
    --gradient-end: #4c1d95;
    --overlay-bg: rgba(0, 0, 0, 0.3);
    --timer-text: #f8fafc;
    --custom-border: rgba(255, 255, 255, 0.1);
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

/* ===== Background Layer ===== */
.background-layer {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.gradient-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    transition: background 0.5s ease;
}

.custom-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.custom-bg.hidden {
    display: none;
}

.bg-overlay {
    position: absolute;
    inset: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(60px);
}

/* ===== App Container ===== */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 16px 24px;
    position: relative;
}

/* ===== Header ===== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.3rem;
    font-weight: 600;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-family: 'Playfair Display', serif;
    background: linear-gradient(135deg, var(--accent) 0%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-controls {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--custom-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

/* ===== Language Select ===== */
.lang-select {
    height: 40px;
    padding: 0 12px;
    border-radius: 10px;
    border: 1px solid var(--custom-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 28px;
}

.lang-select:hover {
    background-color: var(--bg-secondary);
    color: var(--accent);
    border-color: var(--accent);
}

.lang-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.lang-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 8px;
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
    display: block;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 10px 0;
}

/* ===== Mode Tabs ===== */
.mode-tabs {
    display: flex;
    gap: 6px;
    padding: 5px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 14px;
    border: 1px solid var(--custom-border);
}

.mode-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.mode-tab.active {
    background: var(--accent);
    color: white;
}

.tab-icon {
    font-size: 1rem;
}

/* ===== Timer Ring ===== */
.timer-ring {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.progress-ring-circle {
    fill: none;
    stroke: var(--ring-color);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 785;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 0.5s ease, stroke 0.3s ease;
}

.timer-inner {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.timer-display {
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    font-variant-numeric: tabular-nums;
    color: var(--timer-text);
    transition: color 0.3s ease;
}

.timer-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

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

.control-btn {
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.control-btn.primary {
    width: 64px;
    height: 64px;
    background: var(--accent);
    color: white;
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

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

.control-btn.secondary {
    width: 44px;
    height: 44px;
    background: var(--glass-bg);
    color: var(--text-secondary);
    border: 1px solid var(--custom-border);
}

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

.control-btn .pause-icon.hidden,
.control-btn .play-icon.hidden {
    display: none;
}

/* ===== Task Input ===== */
.task-input-wrapper {
    display: flex;
    gap: 8px;
    width: 100%;
    max-width: 320px;
}

.task-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--custom-border);
    border-radius: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

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

.task-input:focus {
    outline: none;
    border-color: var(--accent);
}

.add-task-btn {
    width: 44px;
    height: 44px;
    border: 1px solid var(--custom-border);
    border-radius: 12px;
    background: var(--accent);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.add-task-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
}

/* ===== Session Counter ===== */
.session-counter {
    font-size: 0.85rem;
    color: var(--text-muted);
}

#session-count {
    color: var(--accent);
    font-weight: 600;
}

/* ===== Panels (Music & Tasks) ===== */
.panel {
    position: fixed;
    bottom: 20px;
    width: 300px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid var(--custom-border);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    z-index: 100;
    transition: all 0.3s ease;
}

.music-panel {
    left: 20px;
}

.tasks-panel {
    right: 20px;
}

.panel-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 16px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
}

.panel-toggle:hover {
    background: var(--bg-tertiary);
}

.panel-icon {
    font-size: 1.1rem;
}

.panel-title {
    flex: 1;
    text-align: left;
}

.task-badge {
    background: var(--accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    min-width: 24px;
    text-align: center;
}

.chevron {
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel.collapsed .chevron {
    transform: rotate(180deg);
}

/* Enhanced Panel Animations */
.panel-content {
    padding: 0 16px 16px;
    max-height: 350px;
    overflow-y: auto;
    opacity: 1;
    transform: translateY(0);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.panel.collapsed .panel-content {
    max-height: 0;
    padding: 0 16px;
    opacity: 0;
    transform: translateY(-10px);
    overflow: hidden;
}

.panel {
    transform: translateY(0);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
}

.panel:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
}

.panel.collapsed:hover {
    transform: translateY(-2px);
}

/* ===== Playlist Grid ===== */
.playlist-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.playlist-btn {
    padding: 10px 6px;
    border: 1px solid var(--custom-border);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.playlist-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

.spotify-embed {
    border-radius: 8px;
    overflow: hidden;
}

/* ===== Tasks List ===== */
.tasks-section {
    margin-bottom: 16px;
}

.tasks-section:last-child {
    margin-bottom: 0;
}

.tasks-section h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

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

.task-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 6px;
    border: 1px solid var(--custom-border);
}

.task-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.task-checkbox:hover {
    background: var(--accent-light);
}

.task-checkbox.checked {
    background: var(--accent);
}

.task-checkbox.checked svg {
    display: block;
}

.task-checkbox svg {
    display: none;
    color: white;
}

.task-text {
    flex: 1;
    font-size: 0.85rem;
    color: var(--text-primary);
}

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

.task-delete {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    opacity: 0;
    transition: all 0.2s ease;
}

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

.task-delete:hover {
    color: #ef4444;
}

.empty-state {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    padding: 12px;
}

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

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    padding: 20px;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border-radius: 20px;
    border: 1px solid var(--custom-border);
    width: 100%;
    max-width: 420px;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

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

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 600;
}

.close-btn {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: #ef4444;
    color: white;
}

/* ===== Modal Tabs ===== */
.modal-tabs {
    display: flex;
    padding: 0 20px;
    gap: 4px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--custom-border);
}

.tab-btn {
    flex: 1;
    padding: 12px 8px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all 0.2s ease;
}

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

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: var(--bg-secondary);
}

/* ===== Tab Content ===== */
.tab-content {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.tab-content.hidden {
    display: none;
}

.settings-section {
    margin-bottom: 24px;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h4 {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

/* ===== Settings Grid ===== */
.settings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.setting-item {
    background: var(--bg-tertiary);
    border-radius: 10px;
    padding: 12px;
}

.setting-item label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.input-group input {
    flex: 1;
    padding: 8px 10px;
    border: 1px solid var(--custom-border);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: center;
    width: 60px;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.input-group span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== Setting Row ===== */
.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--custom-border);
}

.setting-row:last-child {
    border-bottom: none;
}

.setting-row label:first-child {
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* ===== Toggle Switch ===== */
.switch {
    position: relative;
    width: 44px;
    height: 24px;
}

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

.slider {
    position: absolute;
    inset: 0;
    background: var(--bg-tertiary);
    border-radius: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.slider::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
}

.switch input:checked+.slider {
    background: var(--accent);
}

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

/* ===== Language Selector ===== */
.language-selector {
    margin-bottom: 12px;
}

.language-selector select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--custom-border);
    border-radius: 10px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.language-selector select:hover {
    border-color: var(--accent);
}

.language-selector select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* ===== Background Options ===== */
.bg-options {
    display: flex;
    gap: 10px;
}

.bg-option {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px;
    border: 2px solid var(--custom-border);
    border-radius: 12px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.bg-option:hover {
    border-color: var(--accent);
}

.bg-option.active {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent);
}

.bg-preview {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.gradient-preview {
    background: linear-gradient(135deg, #e0e7ff 0%, #fce7f3 100%);
}

.solid-preview {
    background: var(--bg-primary);
    border: 1px solid var(--custom-border);
}

.custom-preview {
    background: var(--bg-secondary);
    border: 1px dashed var(--custom-border);
}

.custom-upload {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.custom-upload.hidden {
    display: none;
}

.upload-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border-radius: 8px;
    background: var(--accent);
    color: white;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-btn:hover {
    background: var(--accent-hover);
}

.filename {
    font-size: 0.8rem;
    color: var(--text-muted);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== Color Options ===== */
.color-options {
    display: flex;
    gap: 10px;
}

.color-option {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 3px solid transparent;
    background: var(--color);
    cursor: pointer;
    transition: all 0.2s ease;
}

.color-option:hover {
    transform: scale(1.1);
}

.color-option.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--bg-secondary);
}

/* ===== Custom Colors ===== */
.custom-colors {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.color-picker-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

.color-picker-row label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.color-picker-row input[type="color"] {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: none;
}

.color-picker-row input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-row input[type="color"]::-webkit-color-swatch {
    border-radius: 6px;
    border: none;
}

/* ===== Sound Options ===== */
.sound-options {
    display: flex;
    gap: 10px;
}

.sound-options select {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--custom-border);
    border-radius: 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
}

.sound-options select:focus {
    outline: none;
    border-color: var(--accent);
}

.test-btn {
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: white;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.test-btn:hover {
    background: var(--accent-hover);
}

/* ===== Volume Control ===== */
.volume-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.volume-control input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

#volume-value {
    min-width: 40px;
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .app-container {
        padding: 12px 16px;
    }

    .timer-display {
        font-size: 3.5rem;
    }

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

    .progress-ring-bg,
    .progress-ring-circle {
        r: 100;
    }

    .tab-label {
        display: none;
    }

    .panel {
        width: calc(50% - 30px);
        min-width: 160px;
    }

    .panel-content {
        max-height: 200px;
    }

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

    .task-input-wrapper {
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    .timer-display {
        font-size: 3rem;
    }

    .timer-ring svg {
        width: 180px;
        height: 180px;
    }

    .progress-ring-bg,
    .progress-ring-circle {
        r: 80;
    }

    .panel {
        width: calc(100% - 32px);
        left: 16px;
        right: 16px;
    }

    .music-panel {
        bottom: 70px;
    }

    .tasks-panel {
        bottom: 16px;
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

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