:root {
    /* Color System */
    --primary-hue: 95;
    --primary: hsl(var(--primary-hue), 25%, 35%);
    --primary-light: hsl(var(--primary-hue), 25%, 45%);

    /* Theme Colors */
    --background: #fafbff;
    --surface: #ffffff;
    --text: #2c3e50;
    --text-light: #6c757d;
    --border: #e1e8f5;
    --red: #d32f2c;

    /* Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Effects */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(107, 127, 247, 0.1);
    --shadow-lg: 0 10px 15px rgba(107, 127, 247, 0.1);

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --default-font: "SF Pro Text", "SF Pro Icons", "Helvetica Neue", "Helvetica", "Arial", sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    scrollbar-color: var(--primary) transparent;
    accent-color: var(--primary);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary: hsl(var(--primary-hue), 15%, 50%);
        --primary-light: hsl(var(--primary-hue), 20%, 60%);
        --background: #1a1a1a;
        --surface: #2d2d2d;
        --text: #e1e1e1;
        --text-light: #a7a7a7;
        --border: #404040;
        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.25);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    }
}

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

body {
    background-color: var(--background);
    padding: var(--spacing-md);
    color: var(--text);
    line-height: 1.6;
    font-family: var(--default-font);
}

.ずつ {
    color: var(--primary);
    font-weight: bold;
}

/* Layout */
.container {
    margin: 0 auto;
    padding: var(--spacing-md);
    max-width: 1200px;
}

/* Header */
header {
    margin-bottom: var(--spacing-xl);
    text-align: center;

    & h1 {
        margin: 0;
        color: var(--primary);
        font-weight: 600;
        font-size: 3.2rem;

        & rt {
            opacity: 0;
            transition: opacity 0.2s ease;
            pointer-events: none;
            user-select: none;
        }

        & ruby:hover rt {
            opacity: 1;
        }
    }

    & p {
        margin-top: var(--spacing-xs);
        color: var(--text-light);
        font-size: 1rem;
    }
}

/* Grid layout */
main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.two-panels {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    align-items: start;
    gap: var(--spacing-lg);
    width: 100%;
}

/* Panel */
.panel {
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: var(--spacing-lg);
}

/* Task Input */
.task-input-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);

    & input {
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        background: var(--background);
        padding: var(--spacing-sm);
        color: var(--text);
        font-size: 1rem;

        &:focus {
            outline: none;
            border-color: var(--primary);
        }
    }
}

input[type="number"] {
    border: none;
    border-bottom: 2px solid var(--primary-light);
    background: transparent;
    padding: var(--spacing-xs) 0;
    width: 60px;
    color: var(--text);
    font: var(--default-font);
    font-size: 1.1rem;
    text-align: center;
}

input[type="number"]:focus {
    outline: none;
    border-bottom-color: var(--primary);
}

input[type="number"].task-duration-input {
    width: 4rem;
}

.task-name-input {
    flex: 1;
    min-width: 0;
}

.duration-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Task List */
#taskPlaceholder {
    padding: var(--spacing-md);
    color: var(--text-light);
    font-size: 1rem;
    text-align: center;
}

.tasks-container {
    border-radius: var(--radius-lg);
    background: var(--surface);
    overflow: hidden;
}

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

.task-item {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md);
}

/* Task states */
.task-item.completed {
    opacity: 0.7;
    background-color: var(--background);
}

.task-item.completed .task-name {
    color: var(--text-light);
}

.task-item.current {
    /* Special border to make it stand out */
    background-color: var(--primary);
    color: var(--surface);
}

.task-item.current .task-duration {
    color: var(--surface);
}

.icon-action-button {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    transition: color 0.2s ease;
    cursor: pointer;
    border: none;
    background: none;
    padding: 0;
    width: 24px;
    height: 24px;
    color: var(--text-light);
    font-size: 1.2rem;
}

.icon-action-button:hover {
    transform: none;
    background: none;
}

.delete-button {
    margin-left: var(--spacing-sm);
}

.delete-button:hover {
    color: var(--red);
}

.editable-duration {
    position: relative;
    transition: color 0.2s ease;
    cursor: pointer;
}

.editable-duration:hover {
    color: var(--accent-color);
}

.editable-duration:hover::after {
    position: absolute;
    top: -0.1em;
    left: -1.2em;
    opacity: 0.8;
    content: "✎";
}

.edit-duration-input {
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding: 2px 4px;
    font-size: 1em;
}

.drag-handle {
    cursor: grab;
    margin-right: var(--spacing-sm);
    color: var(--text-light);
    user-select: none;
}

.task-item.dragging {
    opacity: 0.7;
    cursor: grabbing;
    background: var(--background);
}

.task-item.dragging .drag-handle {
    cursor: grabbing;
}

.task-name {
    flex: 1;
    margin-right: var(--spacing-sm);
}

.task-name.editable {
    transition: text-decoration 0.2s ease;
    cursor: text;
}

.task-name.editable:hover {
    text-decoration: underline;
    text-decoration-color: var(--primary);
    text-underline-offset: 2px;
}

.task-duration {
    color: var(--text-light);
}

/* Current Task */
.current-task {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--primary);
    padding: var(--spacing-xl);
    color: white;
    text-align: center;

    & h2 {
        margin: 0;
        font-weight: 500;
        font-size: 2.5rem;
        line-height: 1.2;
    }

    & p {
        opacity: 0.9;
        margin-top: var(--spacing-xs);
    }
}

/* Timer Display */
.timer-section {
    text-align: center;
}

.timer-display {
    margin: var(--spacing-lg) 0;
    color: var(--primary);
    font-weight: bold;
    font-size: 4rem;
    font-variant-numeric: tabular-nums;
}

.timer-display.paused {
    opacity: 70%;
}

/* Controls */
.controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

/* Buttons */
button {
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-md);
    background: var(--primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: white;
    font-size: 1rem;

    &:hover {
        background: var(--primary-light);
    }

    &.secondary {
        border: 1px solid var(--primary);
        background: transparent;
        color: var(--primary);

        &:hover {
            background: var(--primary);
            color: white;
        }
    }
}

#addTaskButton {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    width: 36px;
    height: 36px;
    font-size: 1.5rem;
    line-height: 0;
}

button[disabled] {
    position: relative;
    opacity: 0.5;
    cursor: not-allowed;
}

button[disabled]::before {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    padding: 4px 8px;
    pointer-events: none;
    color: var(--text);
    font-size: 0.8rem;
    white-space: nowrap;
}

#exportButton[disabled]::before {
    content: "nothing to export";
}

#startSessionButton[disabled]::before {
    content: "no pending tasks";
}

button[disabled]:hover::before {
    opacity: 1;
}

.tasks-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

#resetButton {
    display: none;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    min-width: fit-content;
    font-size: 0.9rem;
}

.total-time {
    margin-left: auto;
    color: var(--text-light);
    font-weight: 400;
    font-size: 0.9rem;
}

/* Import/Export Controls */
#importExportControls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* Start Session Button */
.panel .start-session {
    display: block;
    margin-top: var(--spacing-lg);
    width: 100%;
}

/* Progress Bar */
.progress-bar {
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-sm);
    background: var(--border);
    width: 100%;
    height: 0.7rem;
    overflow: hidden;
}

.progress-fill {
    transition: width 0.3s ease;
    background: var(--primary);
    width: 0%;
    height: 100%;
}

/* Modal stuff */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    background-color: color-mix(in srgb, var(--primary) 12%, rgba(0, 0, 0, 0));
    width: 100%;
    height: 100%;
    overflow: auto;

    p a {
        color: var(--primary);
    }

    p a:hover {
        background-color: var(--primary);
        color: var(--background);
        text-decoration: none;
    }
}

kbd {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.1rem 0.3rem;
    font-size: 0.9rem;
}

.modal:target {
    display: flex;
    justify-content: center;
    align-items: center;
}

.help-icon-container {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 1;
}

.help-icon svg {
    display: block;
    width: 22px;
    height: 22px;
}

.help-icon {
    display: inline-flex;
    vertical-align: middle;
    transition: color 0.2s ease;
    margin-left: var(--spacing-xs);
    aspect-ratio: 1;
    width: 24px;
    color: var(--text-light);
}

.help-icon:hover {
    color: var(--text);
}

.modal-backdrop {
    -webkit-backdrop-filter: blur(2px);
    position: fixed;
    top: 0;
    left: 0;
    backdrop-filter: blur(2px);
    width: 100%;
    height: 100%;
}

/* Modal container */
.modal-content {
    display: flex;
    position: relative;
    flex-direction: column;
    margin: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background-color: var(--surface);
    padding: var(--spacing-md) var(--spacing-xl);
    width: 100%;
    max-width: 42em;
    max-height: 90vh;

    h3 {
        margin-top: var(--spacing-md);
        color: var(--primary-light);
    }

    h3:first-child {
        margin-top: 0;
    }
}

/* Modal body */
.modal-body {
    overflow-y: auto;

    ol,
    ul {
        margin-top: 0.2rem;
        margin-left: 1.5rem;
    }

    ol {
        list-style-type: decimal;
    }

    ul {
        list-style-type: disc;
    }

    p {
        margin-top: 0.5rem;
    }

    rt {
        font-size: 0.77em;
    }
}

/* Modal header */
.modal-header {
    position: relative;
    top: 0;
    justify-content: space-between;
    align-items: center;
    z-index: 1;
    color: var(--text);
}

.modal-close {
    position: absolute;
    top: -1rem;
    right: 0;
    color: var(--text-light);
    font-size: 2rem;
    text-decoration: none;
}

.modal-close:hover,
.modal-close:focus,
.modal-backdrop:hover~.modal-content .modal-close {
    cursor: pointer;
    color: var(--primary);
    text-decoration: none;
}

/* Tiles */
summary {
    cursor: pointer;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs);
    color: var(--text-light);
    font-size: 1rem;
    user-select: none;
    text-align: center;
}

.tiles-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 170px), 1fr));
    gap: var(--spacing-md);
    width: 100%;
    overflow: visible;
}

.tile {
    display: flex;
    position: relative;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--spacing-md);
    aspect-ratio: 1;
    width: 100%;
}

.tile-icon {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    padding: 0;
    aspect-ratio: 1;
    width: 20px;
    height: 20px;
    color: var(--text-light);
}

.tile-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    min-width: 0;
}

.popup {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    visibility: hidden;
    opacity: 0;
    z-index: 1;
    transition: opacity 0.2s ease, visibility 0.2s ease;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    padding: var(--spacing-xs) var(--spacing-sm);
    width: max-content;
    max-width: 205px;
    color: var(--text);
    font-size: 0.9rem;
    text-align: center;
}

.tile-icon:hover,
.tile-icon:focus {
    color: var(--primary);
}

.tile-icon:hover+.tile-docs,
.tile-icon:focus+.tile-docs {
    visibility: visible;
    opacity: 1;
}

.tile-result {
    transition: transform 0.3s ease, opacity 0.3s ease;
    margin: auto 0;
    min-height: 1.5em;
    color: var(--text);
    font-weight: bold;
    font-size: 1.4em;
}

.tile-result.animating {
    transform: scale(0.8);
    opacity: 0;
}

.tile-button {
    cursor: pointer;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    padding: var(--spacing-sm) var(--spacing-md);
    height: 2.4rem;
    color: var(--text);
}

.tile-button:active {
    transform: scale(0.95);
}

.icon-button {
    display: flex;
    justify-content: center;
    align-items: center;
    aspect-ratio: 1;
}

/* Number tile specifics */
.number-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 1rem;
    width: 100%;
}

.number-input {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--background);
    padding: var(--spacing-xs);
    width: 100%;
    color: var(--text);
    font-size: 0.9rem;
    text-align: center;
}

/* Counter */
#counterResult,
#chronoResult {
    font-weight: bold;
    font-size: 2.5rem;
}

/* Note tile */
.note-textarea {
    border: none;
    background: none;
    padding: var(--spacing-sm);
    aspect-ratio: 1;
    width: 100%;
    resize: none;
    color: var(--text);
    font-size: 0.9rem;
    line-height: 1.4;
    font-family: var(--default-font);
}

.note-textarea::placeholder {
    color: var(--text-light);
    font-style: italic;
}

/* Random selector */
.tile-input {
    margin-bottom: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--background);
    padding: var(--spacing-xs);
    width: 100%;
    color: var(--text);
    font-size: 0.9rem;
    text-align: left;
}

#selectorResult {
    font-size: 1rem;
}

/* Not Pomodoro */
.interval-inputs {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: 1.5rem;
}

.interval-inputs span {
    color: var(--text-light);
}

/* Activity calendar */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 2px;
    margin: auto;
    margin-top: 1.2rem;
    width: 100%;

    .calendar-day-container {
        position: relative;

        .calendar-day {
            border-radius: var(--radius-sm);
            background: var(--background);
            aspect-ratio: 1;

            &.activity-empty {
                opacity: 0.1;
                background: var(--text);
            }

            &.activity-q1 {
                opacity: 0.25;
                background: var(--primary);
            }

            &.activity-q2 {
                opacity: 0.5;
                background: var(--primary);
            }

            &.activity-q3 {
                opacity: 0.75;
                background: var(--primary);
            }

            &.activity-q4 {
                opacity: 1;
                background: var(--primary);
            }

            &:hover + .calendar-popup,
            &:focus + .calendar-popup {
                visibility: visible;
                opacity: 1;
            }
        }
    }
}

/* GitHub corner */
#github-corner {
    position: absolute;
    top: 0;
    right: 0;
    border: 0;
}

.corner-svg {
    fill: var(--primary);
    width: 80px;
    height: 80px;
    color: var(--background);
}

.corner-bg {
    fill: var(--primary);
}

.octo-arm,
.octo-body {
    fill: currentColor;
}

.octo-arm {
    transform-origin: 130px 106px;
}

#github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {

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

    20%,
    60% {
        transform: rotate(-25deg);
    }

    40%,
    80% {
        transform: rotate(10deg);
    }
}

/* Mobile Adjustments */
@media (max-width: 800px) {
    .tiles-container {
        overflow-x: hidden;
      }

    .container {
        padding: 0;
    }

    .calendar-popup {
        top: 0;
        left: 0;
        transform: translateX(-80%) translateY(-100%);
    }

    .panel {
        border-radius: var(--radius-md);
        padding: var(--spacing-md);
    }

    .controls {
        flex-direction: column;
    }

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

    .task-input-group {
        flex-wrap: wrap;

        & .task-name-input {
            flex: 90%;
        }
    }

    main {
        grid-template-columns: 1fr;
    }

    .panel {
        grid-column: 1 / -1;
    }

    #github-corner:hover .octo-arm {
        animation: none;
    }

    #github-corner .octo-arm {
        animation: octocat-wave 560ms ease-in-out;
    }

    .corner-svg {
        width: 55px;
        height: 55px;
    }

}

@media (min-width: 1024px) {
    main {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (prefers-reduced-motion: reduce) {
    #github-corner:hover .octo-arm {
        animation: none;
    }

    ruby rt {
        transition: none;
    }
}