/* ==========================================
   CSS VARIABLES & THEME
   ========================================== */
:root {
    --color-cream-50: rgba(252, 252, 249, 1);
    --color-cream-100: rgba(255, 255, 253, 1);
    --color-gray-200: rgba(245, 245, 245, 1);
    --color-gray-300: rgba(167, 169, 169, 1);
    --color-gray-500: rgba(115, 115, 115, 1);
    --color-charcoal-700: rgba(31, 33, 33, 1);
    --color-charcoal-800: rgba(38, 40, 40, 1);
    --color-black: rgba(0, 0, 0, 1);

    --color-brown-600-rgb: 94, 82, 64;
    --color-primary-rgb: 182, 95, 207;
    --color-and-rgb: 45, 180, 120;
    --color-or-rgb: 45, 120, 200;

    --color-primary: rgba(var(--color-primary-rgb), 1);
    --color-background: var(--color-cream-50);
    --color-surface: var(--color-cream-100);
    --color-text: var(--color-black);
    --color-text-secondary: var(--color-gray-500);
    --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
    --color-border: rgba(var(--color-brown-600-rgb), 0.2);
    --color-focus-ring: rgba(var(--color-primary-rgb), 0.25);

    --color-single: rgb(var(--color-primary-rgb));
    --color-and: rgb(var(--color-and-rgb));
    --color-or: rgb(var(--color-or-rgb));
    --color-single-bg: rgba(var(--color-primary-rgb), 0.18);
    --color-and-bg: rgba(var(--color-and-rgb), 0.18);
    --color-or-bg: rgba(var(--color-or-rgb), 0.18);
    --color-single-border: rgba(var(--color-primary-rgb), 0.35);
    --color-and-border: rgba(var(--color-and-rgb), 0.35);
    --color-or-border: rgba(var(--color-or-rgb), 0.35);

    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-base: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-3xl: 24px;
    --font-size-4xl: 30px;
    --font-weight-medium: 500;
    --font-weight-semibold: 550;
    --font-weight-bold: 600;
    --line-height-normal: 1.5;
    --letter-spacing-tight: -0.01em;

    --space-4: 4px;
    --space-6: 6px;
    --space-8: 8px;
    --space-12: 12px;
    --space-16: 16px;
    --space-24: 24px;
    --space-32: 32px;
    --radius-base: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --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 12px 36px rgba(0, 0, 0, 0.25), 0 4px 12px rgba(0, 0, 0, 0.15);

    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
    --theme-transition: background-color var(--duration-normal) var(--ease-standard),
                        border-color var(--duration-normal) var(--ease-standard),
                        color var(--duration-normal) var(--ease-standard),
                        box-shadow var(--duration-normal) var(--ease-standard),
                        transform var(--duration-normal) var(--ease-standard);

    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23000000' 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");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' 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");
    --select-caret: var(--select-caret-light);
}

.dark-mode {
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(167, 169, 169, 0.7);
    --color-secondary: rgba(119, 124, 124, 0.15);
    --color-border: rgba(119, 124, 124, 0.3);
    --select-caret: var(--select-caret-dark);
}

body, .articulation-card, .form-control, .group-box-single, .group-box-and,
.group-box-or, .card-header, .theme-toggle, .github-btn, .course-chip {
    transition: var(--theme-transition);
}

.no-transition * {
    transition: none !important;
}


/* ==========================================
   GLOBAL LAYOUT
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: var(--line-height-normal);
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-32) var(--space-16);
}

header {
    text-align: center;
    margin-bottom: var(--space-32);
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    margin-bottom: var(--space-8);
    letter-spacing: var(--letter-spacing-tight);
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin: 0;
}

.header-actions {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-16);
    margin-bottom: var(--space-16);
}

.theme-toggle, .github-btn {
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    text-decoration: none;
}

.theme-toggle:hover, .github-btn:hover {
    background-color: var(--color-border);
}

.sun-icon {
    display: none;
    line-height: 1;
}

.moon-icon {
    display: block;
    line-height: 1;
}

.dark-mode .sun-icon {
    display: block;
}

.dark-mode .moon-icon {
    display: none;
}

.github-btn svg {
    display: block;
    fill: var(--color-text);
    width: 20px;
    height: 20px;
}


/* ==========================================
   FORMS & INPUTS
   ========================================== */
.search-section {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-24);
    max-width: 800px;
    margin: 0 auto var(--space-32) auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-width: 0;
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-8);
    color: var(--color-text);
}

.select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    min-width: 0;
}

.form-control {
    width: 100%;
    max-width: 100%;
    padding: var(--space-12);
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-repeat: no-repeat;
    background-position: right var(--space-12) center;
    background-size: 16px;
    padding-right: 40px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--focus-ring);
}

.form-control:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.loading-spinner {
    position: absolute;
    right: var(--space-12);
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    will-change: transform;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.clear-btn, .caret-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    transition: all var(--duration-normal) var(--ease-standard);
}

.clear-btn {
    right: 12px;
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 2;
}

.clear-btn:hover {
    background-color: var(--color-secondary);
    color: var(--color-text);
}

.caret-icon {
    right: 16px;
    color: var(--color-text-secondary);
    pointer-events: none;
    z-index: 1;
}

input.form-control:not([readonly]):not(:placeholder-shown) ~ .clear-btn {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

input.form-control:not([readonly]):not(:placeholder-shown) ~ .caret-icon {
    opacity: 0;
    visibility: hidden;
    transform: translateY(-50%) scale(0.5);
}

.custom-select-wrapper.is-open .caret-icon {
    transform: translateY(-50%) rotate(180deg);
}


/* ==========================================
   CUSTOM DROPDOWNS
   ========================================== */
.custom-select-wrapper {
    position: relative;
}

.custom-options-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 300px;
    overflow-y: auto;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    margin-top: var(--space-4);

    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: all var(--duration-normal) var(--ease-standard);

}

.custom-options-list.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.custom-option {
    padding: var(--space-8) var(--space-12);
    cursor: pointer;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: background-color var(--duration-fast) var(--ease-standard);
}

.custom-option:last-child,
.custom-option.last-visible {
    border-bottom: none;
}

.custom-option:hover { background-color: var(--color-secondary); }

.custom-option-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.custom-option-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.custom-optgroup {
    padding: var(--space-8) var(--space-12);
    font-size: 11px;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
    background-color: var(--color-background);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: default;
    border-bottom: 1px solid var(--color-border);
}

.no-results-message {
    padding: var(--space-16) var(--space-12);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    font-style: italic;
    background-color: transparent;
    cursor: default;
}


/* ==========================================
   RESULTS LAYOUT & CARDS
   ========================================== */
.articulation-results {
    margin-top: var(--space-32);
}

.results-header {
    text-align: center;
    margin-bottom: var(--space-32);
}

.results-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-8);
    color: var(--color-text);
}

.selected-course {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin: 0;
    white-space: pre-wrap;
}

.articulation-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-32);
    gap: var(--space-16);
}

.articulation-loading .loading-spinner {
    position: static;
    width: 32px;
    height: 32px;
}

.articulation-loading p {
    color: var(--color-text-secondary);
    margin: 0;
}

.articulation-cards {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-24);
}

.articulation-card {
    width: calc((100% - (var(--space-24) * 2)) / 3);
    min-width: 320px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: var(--space-16);
    background-color: var(--color-secondary);
    border-bottom: 1px solid var(--color-border);
    border-top-left-radius: calc(var(--radius-lg) - 1px);
    border-top-right-radius: calc(var(--radius-lg) - 1px);
}

.college-name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text);
    margin: 0;
}

.card-body {
    padding: var(--space-16);
}


/* ==========================================
   COURSES
   ========================================== */
.course-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-16);
}

.course-item {
    width: 100%;
    text-align: center;
}

/* Group Boxes */
.group-box {
    border-radius: var(--radius-base);
    padding: var(--space-12) var(--space-16);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-8);
    width: 100%;
}

.group-box-single {
    background: var(--color-single-bg);
    border: 1px solid var(--color-single-border);
}

.group-box-and {
    background: var(--color-and-bg);
    border: 1px solid var(--color-and-border);
}

.group-box-or {
    background: var(--color-or-bg);
    border: 1px solid var(--color-or-border);
}

.course-chip {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    width: 95%;
    padding: var(--space-8) var(--space-12);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
}

.chip-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    text-align: center;
}

.chip-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    text-align: center;
}

.course-separator {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
    padding: var(--space-4) 0;
    letter-spacing: 0.05em;
}

.separator-and { color: var(--color-and); }
.separator-or { color: var(--color-or); }

.group-separator {
    display: block;
    width: fit-content;
    flex: none;
    list-style: none;
    font-size: 10px;
    font-weight: var(--font-weight-bold);
    padding: 2px 10px;
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    text-transform: uppercase;
}

.group-separator-and {
    color: var(--color-and);
    border-color: var(--color-and-border);
    background-color: var(--color-and-bg);
}

.group-separator-or {
    color: var(--color-or);
    border-color: var(--color-or-border);
    background-color: var(--color-or-bg);
}


/* ==========================================
   TOOLTIPS
   ========================================== */
.articulation-path.has-tooltip {
    position: relative;
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    transition: background-color var(--duration-normal) var(--ease-standard);
}

.articulation-path.has-tooltip:hover {
    background-color: var(--color-secondary);
    box-shadow: var(--shadow-md);
}

.path-separator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin: var(--space-16) 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-secondary);
}

.path-separator::before,
.path-separator::after {
    content: "";
    flex: 1;
    height: 1px;
    background-color: var(--color-border);
}

.path-or-badge {
    position: relative;
    cursor: help;
    display: inline-block;
    padding: 0 var(--space-12);
}

.context-tooltip,
.or-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(5px) scale(0.95);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-standard);
    z-index: 50;
    padding-bottom: 8px;
    pointer-events: auto;
}

.articulation-path.has-tooltip:hover .context-tooltip,
.path-or-badge:hover .or-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0) scale(1);
}

.context-tooltip-content,
.or-tooltip {
    background-color: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    box-shadow: var(--shadow-lg);
    width: max-content;
}

.or-tooltip {
    padding: var(--space-8) var(--space-12);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    max-width: 220px;
    white-space: normal;
    line-height: 1.4;
}

.context-tooltip-content {
    padding: var(--space-8) var(--space-12);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
    align-items: center;
    max-width: 250px;
}

.context-tooltip-header {
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 10px;
    color: var(--color-text-secondary);
}

.context-tag {
    background-color: var(--color-secondary);
    color: var(--color-text);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    padding: var(--space-4) var(--space-8);
    border-radius: var(--radius-base);
    text-align: center;
    line-height: 1.3;
    width: 100%;
}


/* ==========================================
   NOTES
   ========================================== */
.no-articulations {
    text-align: center;
    padding: var(--space-32);
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
}

.no-articulations p {
    margin: 0;
}

.group-box .course-notes {
    margin-top: 0;
}

.course-notes {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    margin-top: var(--space-8);
    padding: 0 var(--space-8);
}

.course-notes-above {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
    padding: 0 var(--space-8);
}

.note-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-6);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.4;
}

.note-text { flex: 1; }


/* ==========================================
   MEDIA QUERIES FOR MOBILE
   ========================================== */
@media (max-width: 768px) {
    .search-section {
        grid-template-columns: 1fr;
    }

    .form-group,
    .articulation-card {
        width: 100%;
    }

    h1 {
        font-size: var(--font-size-3xl);
    }

    /* Prevent iOS Safari from zooming in on input fields */
    input.form-control,
    select.form-control {
        font-size: 16px !important;
    }
}