:root {
    --bg-color: #0d1117;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #3182ce;
    --card-bg: rgba(22, 27, 34, 0.6);
    --card-border: rgba(48, 54, 61, 0.5);

    --orb-1: #58a6ff;
    --orb-2: #8a2be2;
    --orb-3: #ff7b72;

    --session-lecture: #58a6ff18;
    --session-lecture-badge: #58a6ff33;
    --session-lecture-border: #58a6ff;

    --session-section: #b458ff18;
    --session-section-badge: #b458ff33;
    --session-section-border: #b458ff;

    --session-quiz: #ff955818;
    --session-quiz-badge: #ff955833;
    --session-quiz-border: #ff9558;

    --session-mid-term: #ff585818;
    --session-mid-term-badge: #ff585833;
    --session-mid-term-border: #ff5858;
    
    --session-final: #ff585818;
    --session-final-badge: #ff58581833;
    --session-final-border: #ff5858;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    padding-bottom: 4rem;
}

/* Background Animations */
.background-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out alternate;
}

.orb-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--orb-1), transparent 70%);
    animation-delay: 0s;
}

.orb-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--orb-2), transparent 70%);
    animation-delay: -5s;
}

.orb-3 {
    top: 40%;
    left: 60%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, var(--orb-3), transparent 70%);
    animation-delay: -10s;
}

@keyframes float {
    0% {
        transform: translate(0, 0) scale(1);
    }

    100% {
        transform: translate(5%, 5%) scale(1.05);
    }
}

/* Typography & Layout */
.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.app-header {
    text-align: center;
    margin-bottom: 3rem;
    margin-top: 2rem;
}

.app-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, #fff, var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Glassmorphism Cards */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    margin-bottom: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    box-shadow: 0 12px 48px 0 rgba(0, 0, 0, 0.4);
}

/* Selection Panel */
.selection-panel {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step-container {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.step-container.hidden {
    display: none;
    opacity: 0;
    transform: translateY(-10px);
}

.hidden {
    display: none !important;
}

.step-container label {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.subtitle {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.custom-select {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(13, 17, 23, 0.8);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23e6edf3' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1.5rem center;
    background-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.custom-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(13, 17, 23, 0.8);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.custom-select:focus,
.custom-select:hover,
.custom-input:focus,
.custom-input:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

/* Search Container */
.search-container {
    margin-top: 1rem;
}

.search-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.search-input-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
    align-items: center;
}

.search-input-group input {
    flex: 1;
    padding: 0.8rem 1rem;
    margin-bottom: 0;
}

.search-input-group button {
    padding: 0.8rem 1.5rem;
    white-space: nowrap;
    margin-top: 0;
}

.search-result {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 0.5rem;
}

.select-all-label {
    grid-column: 1 / -1;
}

.course-checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.2rem;
    background: rgba(13, 17, 23, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.course-checkbox-label:hover {
    background: rgba(13, 17, 23, 0.9);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.course-checkbox-label input[type="checkbox"] {
    flex-shrink: 0;
    margin-top: 0.2rem;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--card-border);
    border-radius: 6px;
    background-color: transparent;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
}

.course-checkbox-label input[type="checkbox"]:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.course-checkbox-label input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 1px;
    left: 6px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.course-checkbox-label span {
    font-size: 1.05rem;
    font-weight: 500;
    transform: translateY(-5px);
}

/* Buttons */
.primary-btn {
    padding: 1.2rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-color), #8a2be2);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.3s;
    align-self: flex-start;
    margin-top: 1rem;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.4);
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.6);
}

.primary-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.primary-btn.hidden {
    display: none;
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--card-border);
    box-shadow: none;
}

/* Schedule View */
.schedule-panel {
    animation: fadeIn 0.6s ease;
}

.schedule-panel.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.schedule-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1.5rem;
}

.schedule-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.view-toggles {
    display: flex;
    background: rgba(13, 17, 23, 0.8);
    border-radius: 8px;
    padding: 0.3rem;
    border: 1px solid var(--card-border);
}

.view-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-btn.active {
    background: var(--card-border);
    color: var(--text-primary);
}

/* Timetable Utilities */
.timetable {
    width: 100%;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* List View */
.list-view {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.day-group {
    background: rgba(13, 17, 23, 0.5);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--card-border);
}

.day-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.day-title i {
    color: var(--accent-color);
}

.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.session-card {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding: 1.2rem;
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.session-card:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.session-card.lecture {
    background: var(--session-lecture);
    border-color: var(--session-lecture-border);
}

.session-card.section {
    background: var(--session-section);
    border-color: var(--session-section-border);
}

.session-card.quiz {
    background: var(--session-quiz);
    border-color: var(--session-quiz-border);
}

.session-card.mid-term {
    background: var(--session-mid-term);
    border-color: var(--session-mid-term-border);
}

.session-card.final {
    background: var(--session-final);
    border-color: var(--session-final-border);
}

.session-card.custom-color {
    background: rgba(var(--card-color-rgb), 0.1);
    border-color: var(--card-color);
}

.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.session-badge {
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.session-card.custom-color .session-badge {
    background: rgba(var(--card-color-rgb), 0.2);
    color: var(--card-color);
}

.lecture .session-badge {
    background: var(--session-lecture-badge);
    color: var(--session-lecture-border);
}

.section .session-badge {
    background: var(--session-section-badge);
    color: var(--session-section-border);
}

.quiz .session-badge {
    background: var(--session-quiz-badge);
    color: var(--session-quiz-border);
}

.mid-term .session-badge {
    background: var(--session-mid-term-badge);
    color: var(--session-mid-term-border);
}

.final .session-badge {
    background: var(--session-final-badge);
    color: var(--session-final-border);
}

.session-time {
    font-weight: 600;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.3);
    padding: 0.3rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
}

.session-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.session-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.4rem;
}

.session-details {
    display: flex;
    gap: 1.5rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    opacity: 0.9;
}

.session-details span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.session-course-id {
    font-family: monospace;
    background: rgba(0, 0, 0, 0.4);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.highlight-badge {
    color: #10b981;
    font-weight: 700;
    text-shadow: 0 0 8px rgba(16, 185, 129, 0.3);
    background: rgba(16, 185, 129, 0.15);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

@media (max-width: 768px) {
    .app-header h1 {
        font-size: 2.2rem;
    }

    .glass-card {
        padding: 1.5rem;
    }

    /* Stack ID Search group */
    .search-input-group {
        flex-direction: column;
        align-items: stretch;
    }

    .search-input-group button.primary-btn {
        width: 100%;
        margin-top: 0.5rem;
    }

    /* Wrap session details so they don't overflow */
    .session-details {
        flex-wrap: wrap;
        gap: 0.8rem;
    }

    .session-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .primary-btn {
        width: 100%;
        text-align: center;
    }

    .courses-grid {
        grid-template-columns: 1fr;
    }

    /* Ensure Checkbox text matches hit area well */
    .course-checkbox-label {
        padding: 1rem;
    }

    .session-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
    }
}