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

:root {
    /* Primary */
    --orange: #F37022;
    --orange-light: #FF8F4D;
    --orange-dark: #D45E15;

    /* Accent Colors */
    --teal: #00A5B5;
    --blue: #2E86AB;
    --pink: #E84A8A;
    --green: #7CB342;
    --yellow: #F9A826;

    /* Neutrals */
    --dark-text: #1A1A1A;
    --body-text: #4A4A4A;
    --background: #FFF9F5;
    --white: #FFFFFF;
    --dark-footer: #2D2D2D;
    --disabled: #E0E0E0;
    --disabled-text: #9E9E9E;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--dark-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: var(--white);
    padding: 0.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.logo-img {
    height: 40px;
    width: auto;
}

.school-img {
    height: 40px;
    width: auto;
}

.header-title-link {
    text-decoration: none;
}

.header-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--blue);
    margin: 0;
    transition: opacity 0.2s;
}

.all-locations-link {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-text);
    text-decoration: none;
}

.all-locations-link:hover {
    text-decoration: underline;
}

/* Main Content */
main {
    flex: 1;
    padding: 1rem 2rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

/* Selection Rows */
.selection-row {
    margin-bottom: 1rem;
}

.row-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--body-text);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: opacity 0.3s;
}

.selection-row:has(.disabled) .row-label {
    opacity: 0.3;
}

.selection-row:has(.active) .row-label {
    color: var(--dark-text);
    font-weight: 700;
}

.selection-row:has(.completed) .row-label {
    opacity: 0.5;
}

/* Tile Row */
.tile-row {
    display: flex;
    gap: 1rem;
    transition: opacity 0.3s, filter 0.3s;
}

.tile-row.disabled {
    opacity: 0.15;
    filter: grayscale(100%);
    pointer-events: none;
}

.tile-row.completed .tile:not(.selected) {
    opacity: 0.25;
    filter: grayscale(100%);
}

.tile-row.active {
    background: rgba(255, 255, 255, 0.5);
    padding: 0.75rem;
    margin: -0.75rem;
    border-radius: 12px;
}

/* Tiles */
.tile {
    flex: 1;
    background: var(--white);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.tile.selected {
    border-color: currentColor;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: scale(1.02);
}

.tile-icon {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.tile-icon-wrap {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tile-svg {
    width: 36px;
    height: 36px;
}

.tile-info {
    display: flex;
    flex-direction: column;
}

.tile-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--dark-text);
}

.tile-detail {
    font-size: 0.75rem;
    color: var(--body-text);
    line-height: 1.3;
}

/* Age Group Tiles - Colors */
.age-tile[data-group="nebula"] {
    border-top: 3px solid var(--teal);
}
.age-tile[data-group="nebula"] .tile-name { color: var(--teal); }
.age-tile[data-group="nebula"].selected {
    border-color: var(--teal);
    background: rgba(0, 165, 181, 0.08);
}

.age-tile[data-group="star"] {
    border-top: 3px solid var(--pink);
}
.age-tile[data-group="star"] .tile-name { color: var(--pink); }
.age-tile[data-group="star"].selected {
    border-color: var(--pink);
    background: rgba(232, 74, 138, 0.08);
}

.age-tile[data-group="supernova"] {
    border-top: 3px solid var(--green);
}
.age-tile[data-group="supernova"] .tile-name { color: var(--green); }
.age-tile[data-group="supernova"].selected {
    border-color: var(--green);
    background: rgba(124, 179, 66, 0.08);
}

/* Type Tiles - Dynamic Colors */
.type-tile {
    border-top: 3px solid var(--orange);
}
.type-tile .tile-svg { color: var(--orange); }

/* Type tiles inherit color from selected age group */
.type-row-nebula .type-tile { border-top-color: var(--teal); }
.type-row-nebula .type-tile .tile-svg { color: var(--teal); }
.type-row-nebula .type-tile.selected {
    border-color: var(--teal);
    background: rgba(0, 165, 181, 0.08);
}

.type-row-star .type-tile { border-top-color: var(--pink); }
.type-row-star .type-tile .tile-svg { color: var(--pink); }
.type-row-star .type-tile.selected {
    border-color: var(--pink);
    background: rgba(232, 74, 138, 0.08);
}

.type-row-supernova .type-tile { border-top-color: var(--green); }
.type-row-supernova .type-tile .tile-svg { color: var(--green); }
.type-row-supernova .type-tile.selected {
    border-color: var(--green);
    background: rgba(124, 179, 66, 0.08);
}

/* Calendar */
.calendar-container {
    background: var(--white);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: opacity 0.3s, filter 0.3s;
}

.calendar-container.disabled {
    opacity: 0.15;
    filter: grayscale(100%);
    pointer-events: none;
}

.calendar-container.active {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

#calendar-section:has(.disabled) .row-label {
    opacity: 0.3;
}

#calendar-section:has(.active) .row-label {
    color: var(--dark-text);
    font-weight: 700;
    opacity: 1;
}

.calendar-header {
    text-align: center;
    margin-bottom: 0.75rem;
}

.calendar-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-text);
    margin: 0;
}

.month-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.month-btn {
    background: none;
    border: 1px solid var(--body-text);
    border-radius: 4px;
    width: 28px;
    height: 28px;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--body-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.month-btn:hover {
    background: var(--body-text);
    color: var(--white);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
    margin-bottom: 0.25rem;
}

.calendar-weekdays span {
    text-align: center;
    font-weight: 600;
    font-size: 0.7rem;
    color: var(--body-text);
    padding: 0.25rem;
}

.calendar-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.25rem;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--body-text);
    border-radius: 6px;
    transition: all 0.2s;
    padding: 0.2rem;
    text-align: center;
    position: relative;
}

.calendar-day.empty {
    background: transparent;
}

.calendar-day.has-lesson {
    background: var(--orange);
    color: var(--white);
    cursor: pointer;
    font-weight: 600;
}

.calendar-day.has-lesson:hover {
    background: var(--orange-dark);
    transform: scale(1.02);
}

.calendar-day.today {
    box-shadow: 0 0 0 3px var(--dark-text), 0 0 12px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.calendar-day.today.has-lesson {
    box-shadow: 0 0 0 3px var(--white), 0 0 12px rgba(0, 0, 0, 0.4);
}

.calendar-day:not(.has-lesson):not(.empty) {
    background: rgba(0, 0, 0, 0.03);
}

.day-number {
    font-size: 1.15rem;
    font-weight: 700;
    position: absolute;
    top: 0.2rem;
}

.day-title {
    font-size: 0.72rem;
    font-weight: 500;
    line-height: 1.1;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.day-theme {
    font-size: 0.5rem;
    font-weight: 400;
    line-height: 1.1;
    margin-top: 0.15rem;
    opacity: 0.85;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}

/* Calendar Theme Colors */
.calendar-nebula .calendar-day.has-lesson {
    background: var(--teal);
}
.calendar-nebula .calendar-day.has-lesson:hover {
    background: #008a98;
}

.calendar-star .calendar-day.has-lesson {
    background: var(--pink);
}
.calendar-star .calendar-day.has-lesson:hover {
    background: #d13a78;
}

.calendar-supernova .calendar-day.has-lesson {
    background: var(--green);
}
.calendar-supernova .calendar-day.has-lesson:hover {
    background: #6a9a38;
}

/* Footer */
footer {
    background: var(--dark-footer);
    padding: 0.75rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 0.5rem 1rem;
    }

    .logo-img, .school-img {
        height: 30px;
    }

    .header-title {
        font-size: 1.25rem;
    }

    main {
        padding: 0.75rem 1rem;
    }

    .tile-row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .tile {
        padding: 0.75rem;
    }

    .tile-icon {
        width: 40px;
        height: 40px;
    }
}