*,
*::before,
*::after {
    box-sizing: border-box;
}

:root {
    color-scheme: light;
    --page-background: linear-gradient(to bottom, #e0f7fa, #80deea);
    --page-text: #01579b;
    --container-background: #ffffff;
    --container-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --input-background: #ffffff;
    --input-border: #b7dbe3;
    --input-text: #01579b;
    --settings-button-background: #f1fbff;
    --settings-button-background-hover: #e1f5fe;
    --settings-button-border: #b7dbe3;
    --settings-button-text: #0277bd;
    --settings-button-shadow: 0 6px 16px rgba(2, 119, 189, 0.12);
    --settings-button-shadow-hover: 0 10px 24px rgba(2, 119, 189, 0.18);
    --heading-color: #0277bd;
    --panel-background: #f1fbff;
    --panel-border: #d3edf3;
    --panel-help: #4f7b85;
    --panel-shadow: 0 16px 40px rgba(0, 77, 64, 0.12);
    --today-background: #e8f5e9;
    --today-text: #004d40;
    --card-background: #f1f8e9;
    --today-highlight-background: #fff176;
    --today-highlight-text: #2f2500;
    --today-highlight-border: #d2a300;
    --footer-text: #757575;
    --modal-overlay: rgba(0, 0, 0, 0.4);
    --modal-background: #fefefe;
    --modal-border: #888888;
    --close-color: #aaaaaa;
    --close-color-hover: #111111;
    --chapter-label: #074b63;
    --chapter-link-background: #d9f3ff;
    --chapter-link-background-hover: #bfe8ff;
    --chapter-link-text: #055f89;
    --chapter-link-shadow: 0 10px 24px rgba(4, 78, 121, 0.12);
    --chapter-link-shadow-hover: 0 12px 28px rgba(4, 78, 121, 0.18);
    --flatpickr-background: #ffffff;
    --flatpickr-surface: #ffffff;
    --flatpickr-text: #1d415a;
    --flatpickr-muted: #86a5b8;
    --flatpickr-border: #d5e8f1;
    --flatpickr-hover: #eef8fd;
    --flatpickr-selected: #2b90d9;
    --flatpickr-selected-text: #ffffff;
}

html[data-theme='dark'] {
    color-scheme: dark;
    --page-background: linear-gradient(to bottom, #06141f, #122a3d);
    --page-text: #d7ebff;
    --container-background: rgba(8, 24, 38, 0.95);
    --container-shadow: 0 18px 50px rgba(0, 0, 0, 0.42);
    --input-background: #102737;
    --input-border: #2e5168;
    --input-text: #d7ebff;
    --settings-button-background: #102737;
    --settings-button-background-hover: #183549;
    --settings-button-border: #32566d;
    --settings-button-text: #8fd0ff;
    --settings-button-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
    --settings-button-shadow-hover: 0 16px 36px rgba(0, 0, 0, 0.32);
    --heading-color: #8fd0ff;
    --panel-background: #102737;
    --panel-border: #2e5168;
    --panel-help: #afcadf;
    --panel-shadow: 0 24px 48px rgba(0, 0, 0, 0.38);
    --today-background: #123042;
    --today-text: #cbf0ff;
    --card-background: #102737;
    --today-highlight-background: #1d4d6a;
    --today-highlight-text: #f3fbff;
    --today-highlight-border: #79c7ff;
    --footer-text: #8aaac0;
    --modal-overlay: rgba(1, 8, 14, 0.72);
    --modal-background: #0d2232;
    --modal-border: #2e5168;
    --close-color: #8aaac0;
    --close-color-hover: #ffffff;
    --chapter-label: #d7ebff;
    --chapter-link-background: #183549;
    --chapter-link-background-hover: #214a63;
    --chapter-link-text: #9ad7ff;
    --chapter-link-shadow: 0 16px 32px rgba(0, 0, 0, 0.24);
    --chapter-link-shadow-hover: 0 18px 36px rgba(0, 0, 0, 0.3);
    --flatpickr-background: #102737;
    --flatpickr-surface: #132d40;
    --flatpickr-text: #d7ebff;
    --flatpickr-muted: #7d9bb0;
    --flatpickr-border: #2e5168;
    --flatpickr-hover: #1b4258;
    --flatpickr-selected: #69c0ff;
    --flatpickr-selected-text: #0b1823;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--page-background);
    color: var(--page-text);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
    transition: background 0.2s ease, color 0.2s ease;
}

.flatpickr-calendar {
    font-family: Arial, sans-serif;
    background: var(--flatpickr-background);
    border: 1px solid var(--flatpickr-border);
    box-shadow: var(--container-shadow);
}

.flatpickr-months .flatpickr-month,
.flatpickr-current-month .flatpickr-monthDropdown-months,
.flatpickr-current-month input.cur-year,
.flatpickr-weekdays,
span.flatpickr-weekday {
    background: var(--flatpickr-surface);
    color: var(--flatpickr-text);
}

.flatpickr-months .flatpickr-prev-month svg,
.flatpickr-months .flatpickr-next-month svg {
    fill: var(--flatpickr-text);
}

.flatpickr-day {
    color: var(--flatpickr-text);
}

.flatpickr-day:hover,
.flatpickr-day:focus {
    background: var(--flatpickr-hover);
    border-color: var(--flatpickr-hover);
}

.flatpickr-day.today {
    border-color: var(--flatpickr-selected);
}

.flatpickr-day.selected,
.flatpickr-day.startRange,
.flatpickr-day.endRange,
.flatpickr-day.selected.inRange,
.flatpickr-day.startRange.inRange,
.flatpickr-day.endRange.inRange,
.flatpickr-day.selected:focus,
.flatpickr-day.startRange:focus,
.flatpickr-day.endRange:focus,
.flatpickr-day.selected:hover,
.flatpickr-day.startRange:hover,
.flatpickr-day.endRange:hover {
    background: var(--flatpickr-selected);
    border-color: var(--flatpickr-selected);
    color: var(--flatpickr-selected-text);
}

.flatpickr-day.inRange,
.flatpickr-day.prevMonthDay.inRange,
.flatpickr-day.nextMonthDay.inRange,
.flatpickr-day.today.inRange,
.flatpickr-day.prevMonthDay.today.inRange,
.flatpickr-day.nextMonthDay.today.inRange {
    background: var(--flatpickr-hover);
    border-color: var(--flatpickr-hover);
    box-shadow: -5px 0 0 var(--flatpickr-hover), 5px 0 0 var(--flatpickr-hover);
}

.flatpickr-day.prevMonthDay,
.flatpickr-day.nextMonthDay,
.flatpickr-day.flatpickr-disabled,
.flatpickr-day.flatpickr-disabled:hover {
    color: var(--flatpickr-muted);
}

.numInputWrapper span.arrowUp:after {
    border-bottom-color: var(--flatpickr-text);
}

.numInputWrapper span.arrowDown:after {
    border-top-color: var(--flatpickr-text);
}

.date-picker input,
.preference-field select {
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 4px;
    font-size: 16px;
    width: 100%;
    cursor: pointer;
    background: var(--input-background);
    color: var(--input-text);
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.date-picker input:focus,
.preference-field select:focus {
    outline: 2px solid var(--heading-color);
    outline-offset: 2px;
}

.container {
    background: var(--container-background);
    position: relative;
    padding: 56px 40px 40px;
    border-radius: 15px;
    box-shadow: var(--container-shadow);
    max-width: 600px;
    width: 100%;
    overflow-x: clip;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.settings-toggle {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 42px;
    height: 42px;
    border: 1px solid var(--settings-button-border);
    border-radius: 999px;
    background: var(--settings-button-background);
    color: var(--settings-button-text);
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    box-shadow: var(--settings-button-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.settings-toggle:hover,
.settings-toggle:focus {
    background: var(--settings-button-background-hover);
    box-shadow: var(--settings-button-shadow-hover);
    transform: rotate(20deg);
    outline: none;
}

h1 {
    color: var(--heading-color);
    font-size: 2.5em;
    margin-bottom: 10px;
}

.clickable,
.clickable2 {
    cursor: pointer;
}

.reading-button {
    appearance: none;
    border: 0;
    padding: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    text-align: inherit;
}

.reading-button:hover,
.reading-button:focus {
    text-decoration: underline;
}

.reading-button:focus {
    outline: 2px solid var(--heading-color);
    outline-offset: 3px;
}

.muted-entry {
    color: var(--panel-help);
}

.app-error {
    background: var(--today-highlight-background);
    color: var(--today-highlight-text);
    box-shadow: inset 0 0 0 1px var(--today-highlight-border);
}

.date-picker {
    margin: 10px 0;
    font-size: 1em;
    text-align: left;
}

.date-picker label,
.preference-field label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.preferences-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    position: absolute;
    top: 66px;
    right: 16px;
    left: 16px;
    width: auto;
    max-width: 320px;
    margin: 0;
    padding: 18px;
    border-radius: 12px;
    background: var(--panel-background);
    border: 1px solid var(--panel-border);
    text-align: left;
    box-shadow: var(--panel-shadow);
    z-index: 2;
}

.preferences-panel[hidden] {
    display: none !important;
}

.preferences-help,
.chapters-preferences {
    margin: 0;
    color: var(--panel-help);
    font-size: 0.95em;
    text-align: left;
}

.today-reading {
    font-size: 1.8em;
    color: var(--today-text);
    margin: 20px 0;
    padding: 20px;
    background: var(--today-background);
    border-radius: 10px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.week-list {
    list-style: none;
    padding: 0;
    overflow-y: auto;
    height: 400px;
}

.week-list li {
    margin: 10px 0;
    padding: 15px;
    background: var(--card-background);
    color: var(--page-text);
    border-radius: 8px;
    font-size: 1.2em;
    transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.week-list li:hover {
    transform: scale(1.03);
}

.today-highlight {
    background: var(--today-highlight-background) !important;
    color: var(--today-highlight-text);
    font-weight: bold;
    box-shadow: inset 0 0 0 1px var(--today-highlight-border);
}

footer {
    margin-top: 30px;
    font-size: 0.8em;
    color: var(--footer-text);
}

.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: var(--modal-overlay);
}

.modal-content {
    background-color: var(--modal-background);
    color: var(--page-text);
    margin: 15% auto;
    padding: 20px;
    border: 1px solid var(--modal-border);
    width: 80%;
    max-width: 500px;
    border-radius: 10px;
    box-shadow: var(--container-shadow);
}

.close {
    color: var(--close-color);
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: var(--close-color-hover);
    text-decoration: none;
    cursor: pointer;
}

#chapters-list {
    list-style-type: none;
    padding: 0;
    display: grid;
    gap: 12px;
}

#chapters-list li {
    margin: 0;
    padding: 12px 16px;
    background: var(--card-background);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    text-align: left;
}

.chapter-label {
    color: var(--chapter-label);
    font-size: 1.05em;
    font-weight: 600;
}

.chapter-link-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.chapter-action-link {
    text-decoration: none;
    color: var(--chapter-link-text);
    background: var(--chapter-link-background);
    font-size: 0.95em;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: 999px;
    transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
    box-shadow: var(--chapter-link-shadow);
}

.chapter-action-link:hover,
.chapter-action-link:focus {
    background: var(--chapter-link-background-hover);
    box-shadow: var(--chapter-link-shadow-hover);
    transform: translateY(-1px);
    outline: none;
}

@media (max-width: 600px) {
    body {
        background: var(--container-background);
        padding: 0;
        align-items: stretch;
    }

    .week-list li {
        display: grid;
        width: calc(100% - 20px);
        font-size: 1em;
        padding: 10px;
    }

    .container {
        max-width: none;
        min-height: 100vh;
        padding: 56px 10px 10px;
        border-radius: 0;
        box-shadow: none;
    }

    .preferences-panel {
        left: 10px;
        right: 10px;
        width: auto;
        max-width: none;
        padding: 14px;
    }

    h1 {
        font-size: 2em;
        margin: 0;
    }

    .today-reading {
        font-size: 1.5em;
        padding: 15px;
    }

    .modal-content {
        width: calc(100% - 20px);
        margin: 10% auto;
    }

    #chapters-list li {
        align-items: flex-start;
        flex-direction: column;
    }

    .chapter-link-group {
        justify-content: flex-start;
    }
}