/* Root Variables */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --text-muted-color: #6c757d;
    --border-color: #dee2e6;
    --lecture-bg: #b8cce4;
    --seminar-bg: #ffeb9c;
    --exercise-bg: #c6efce;
    --work-bg: #92cddc;
    --volno-bg: #fbe2d5;
    --music-bg: #e6d5f0;
    --event-text: #333333;
    --hour-line-color: rgba(255, 166, 166, 0.4);
    --main-hour-line-color: #ff6b6b;
    --lecture-border-color: #2c6598;
    --seminar-border-color: #d2a700;
    --exercise-border-color: #5b9739;
    --work-border-color: #007f89;
    --volno-border-color: #d99077;
    --music-border-color: #8e5ba6;
    --mobile-timetable-background: #f8f9fa;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #181818;
    --text-color: #e0e0e0;
    --text-muted-color: #8a8a8a;
    --border-color: #3a3a3a;
    --lecture-bg: #3b4f65;
    --seminar-bg: #78652f;
    --exercise-bg: #4a6d4d;
    --work-bg: #336569;
    --volno-bg: #5c4640;
    --music-bg: #4c3a5c;
    --event-text: #ffffff;
    --hour-line-color: rgba(255, 107, 107, 0.4);
    --main-hour-line-color: #ff6b6b;
    --lecture-border-color: #7f91b3;
    --seminar-border-color: #d9bb76;
    --exercise-border-color: #6db38e;
    --work-border-color: #5fa0a9;
    --volno-border-color: #a67b6b;
    --music-border-color: #a884bd;
    --mobile-timetable-background: #222;
}

/* Global Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

h1 {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--text-color);
    text-decoration: underline;
    text-decoration-color: #dc143c;
    text-decoration-thickness: 6px;
    text-underline-offset: 6px;
}

h4, h5 {
    color: var(--text-color);
}

h6 {
    color: var(--text-muted-color);
}

main {
    padding-bottom: 60px; /* Space for the footer */
}

/* Week Switch */
.week-button {
    border: 2px solid var(--border-color);
    background-color: transparent;
    color: var(--text-muted-color);
    font-weight: 600;
    font-size: 0.9rem;
    padding: 6px 18px;
    border-radius: 999px;
    margin-right: 8px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.week-button:hover {
    border-color: #dc143c;
    color: var(--text-color);
}

.week-button.active {
    background-color: #dc143c;
    border-color: #dc143c;
    color: #ffffff;
}

/* Timetable Styles */
.timetable-container {
    overflow-x: auto;
}

.timetable {
    display: grid;
    grid-template-columns: auto repeat(5, minmax(150px, 1fr));
    gap: 1px;
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
}

.timetable > div {
    background-color: var(--bg-color);
}

.time-column {
    grid-column: 1;
    display: grid;
    grid-template-rows: auto repeat(13, 1fr);
}

.day-column {
    display: grid;
    grid-template-rows: auto repeat(13, 1fr);
    position: relative;
}

.day-header {
    font-weight: bold;
    padding: 10px;
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 10;
    text-align: center;
}

.time-slot {
    border-top: 1px solid var(--border-color);
    padding: 5px;
    text-align: right;
    font-size: 0.8rem;
    height: 50px;
}

/* Event Styles */
.event {
    position: absolute;
    border-radius: 4px;
    padding: 5px;
    width: calc(100% - 10px);
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    word-wrap: break-word;
    font-size: 0.8rem;
    left: 5px;
    border: 2px solid;
    color: var(--event-text);
}

.event-content {
    width: 100%;
}

.event.lecture {
    background-color: var(--lecture-bg);
    border-color: var(--lecture-border-color);
}

.event.seminar {
    background-color: var(--seminar-bg);
    border-color: var(--seminar-border-color);
}

.event.exercise {
    background-color: var(--exercise-bg);
    border-color: var(--exercise-border-color);
}

.event.work {
    background-color: var(--work-bg);
    border-color: var(--work-border-color);
}

.event.volno {
    background-color: var(--volno-bg);
    border-color: var(--volno-border-color);
}

.event.music {
    background-color: var(--music-bg);
    border-color: var(--music-border-color);
}

/* Hour Line Styles */
.hour-line {
    position: absolute;
    height: 3px;
    width: 100%;
    z-index: 15;
    border: 5px dashed var(--hour-line-color);
    background-color: transparent !important;
}

.hour-line.current {
    background-color: var(--main-hour-line-color) !important;
    border: none;
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.15);
    z-index: 20;
    font-size: 1.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-mode-toggle.sun {
    background-color: #ffeb9c;
    color: #d2a700;
}

.dark-mode-toggle.moon {
    background-color: #424242;
    color: #e0e0e0;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
}

/* Modal Styles */
.modal-content {
    background-color: var(--bg-color);
    color: var(--text-color);
}

.modal-header,
.modal-footer {
    border-color: var(--border-color);
}

.modal-title {
    color: var(--text-color);
}

.btn-close {
    filter: invert(0);
}

body.dark-mode .btn-close {
    filter: invert(1);
}

/* Footer Styles */
footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .timetable {
        grid-template-columns: auto repeat(5, 1fr);
    }

    .time-slot {
        font-size: 0.8rem;
    }

    .event {
        font-size: 0.7rem;
    }
}

@media (max-width: 600px) {
    .timetable {
        grid-template-columns: 1fr;
        background-color: var(--mobile-timetable-background);
        padding: 12px !important;
    }

    #Pondělí {
        margin-top: 20px;
    }

    .day-column {
        display: block;
        border-radius: 12px;
        margin-bottom: 20px;
        box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.15);
    }

    .day-header {
        position: static;
        background-color: var(--bg-color);
        padding: 10px;
        border-radius: 12px;
        font-size: 1.2rem;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
    }

    .event {
        position: relative !important;
        top: auto !important;
        height: auto !important;
        width: calc(100% - 20px);
        margin: 10px 5px 10px 5px;
        font-size: 0.9rem;
    }

    .time-column,
    .time-slot,
    .hour-line {
        display: none;
    }

    .hour-line.mobile {
        display: block;
        position: relative;
        height: 3px;
        border: none;
        width: calc(100% - 20px);
        margin: 10px;
    }
}