:root {
    /* Light Theme */
    --bg-color: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --danger: #ef4444;
    --success: #10b981;
    --panel-bg: rgba(255, 255, 255, 0.95);

    /* Orb Colors */
    --orb-1: #818cf8;
    --orb-2: #38bdf8;
    --orb-3: #a78bfa;
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --panel-bg: rgba(15, 23, 42, 0.95);

    --orb-1: #4f46e5;
    --orb-2: #0ea5e9;
    --orb-3: #8b5cf6;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Animated Background */
.background-orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s infinite ease-in-out alternate;
    transition: background-color 0.3s;
}

.orb-1 {
    width: 300px;
    height: 300px;
    background: var(--orb-1);
    top: -100px;
    left: -100px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--orb-2);
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: var(--orb-3);
    top: 40%;
    left: 60%;
    animation-delay: -10s;
}

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

    100% {
        transform: translate(50px, 50px) scale(1.1);
    }
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    transition: background 0.3s, border-color 0.3s;
}

/* Top Bar */
.top-bar {
    width: 100%;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 40;
    border-left: none;
    border-right: none;
    border-top: none;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--accent-hover), #a78bfa);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.nav-actions {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    background: rgba(128, 128, 128, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-primary);
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-2px);
}

/* Main Container */
.app-container {
    width: 100%;
    max-width: 800px;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    flex-grow: 1;
}

.current-selection-path {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.schedule-container {
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.2);
}

/* Date Navigator */
.date-navigator {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(128, 128, 128, 0.1);
    border-radius: 16px;
    padding: 0.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--glass-border);
}

.date-nav-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.2s;
}

.date-nav-btn:hover {
    background: rgba(128, 128, 128, 0.2);
}

.current-date {
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: background 0.2s;
    text-transform: capitalize;
}

.current-date:hover {
    background: rgba(128, 128, 128, 0.1);
}

/* Classes List */
.classes-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.class-card {
    background: rgba(128, 128, 128, 0.05);
    border: 1px solid rgba(128, 128, 128, 0.1);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    gap: 1rem;
    transition: transform 0.2s, background 0.2s;
}

.class-card:hover {
    transform: translateY(-2px);
    background: rgba(128, 128, 128, 0.1);
}

.class-card.active-class {
    border: 1px solid var(--accent-hover);
    background: rgba(59, 130, 246, 0.1);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.2);
}

.class-time {
    display: flex;
    flex-direction: column;
    justify-content: center;
    font-weight: 600;
    color: var(--accent-hover);
    min-width: 100px;
    white-space: nowrap;
    border-right: 1px solid var(--glass-border);
    padding-right: 1rem;
}

.class-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.class-name {
    font-size: 1.05rem;
    font-weight: 600;
}

.class-teacher,
.class-room {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.class-card.class-gap {
    background: rgba(128, 128, 128, 0.02);
    border: 1px dashed rgba(128, 128, 128, 0.25);
    opacity: 0.85;
}

.class-card.class-gap:hover {
    background: rgba(128, 128, 128, 0.05);
    transform: none;
    opacity: 1;
}

.class-card.class-gap .class-time {
    color: var(--text-secondary);
    border-right: 1px dashed var(--glass-border);
}

.class-card.class-gap .class-name {
    color: var(--text-secondary);
    font-weight: 500;
}

.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
    font-style: italic;
    border-radius: 24px;
}

.hidden {
    display: none !important;
}

/* Side Panels */
.panel-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    z-index: 45;
}

.side-panel {
    position: fixed;
    top: 0;
    right: -450px;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background: var(--panel-bg);
    z-index: 50;
    padding: 2rem;
    overflow-y: auto;
    transition: right 0.3s ease-in-out;
    border-left: 1px solid var(--glass-border);
    border-radius: 0;
}

.side-panel.open {
    right: 0;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.close-panel-btn {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.close-panel-btn:hover {
    color: var(--text-primary);
}

/* Accordeon Picker */
.accordion {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.acc-step {
    background: rgba(128, 128, 128, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    overflow: hidden;
}

.acc-step.locked {
    opacity: 0.45;
    pointer-events: none;
    user-select: none;
}

.acc-step summary {
    padding: 1rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    position: relative;
    user-select: none;
}

.acc-step summary::-webkit-details-marker {
    display: none;
}

.acc-step summary::after {
    content: '+';
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 1.25rem;
    font-weight: normal;
    color: var(--text-secondary);
}

.acc-step[open] summary::after {
    content: '-';
}

.acc-content {
    padding: 1rem;
    border-top: 1px solid var(--glass-border);
}

.grid-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.pick-btn {
    padding: 0.5rem 1rem;
    background: rgba(128, 128, 128, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    font-size: 0.9rem;
}

.pick-btn:hover {
    background: rgba(128, 128, 128, 0.2);
}

.pick-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Settings Panel */
.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--glass-border);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(128, 128, 128, 0.3);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}

input:checked+.slider {
    background-color: var(--accent-color);
}

input:focus+.slider {
    box-shadow: 0 0 1px var(--accent-color);
}

input:checked+.slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* About Panel */
.about-content {
    line-height: 1.6;
}

.github-link {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: background 0.2s;
}

.github-link:hover {
    background: var(--accent-hover);
}

/* Calendar Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    padding: 1rem;
}

.modal-content {
    width: 100%;
    max-width: 400px;
    padding: 1.5rem;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-modal-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
}

.calendar-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-nav button {
    background: rgba(128, 128, 128, 0.2);
    border: none;
    color: var(--text-primary);
    width: 30px;
    height: 30px;
    border-radius: 8px;
    cursor: pointer;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
    text-align: center;
}

.cal-day-header {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.cal-day {
    padding: 0.5rem 0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.cal-day:hover:not(.disabled) {
    background: var(--accent-color);
    color: white;
}

.cal-day.disabled {
    color: rgba(128, 128, 128, 0.3);
    cursor: not-allowed;
}

.cal-day.has-class {
    background: rgba(59, 130, 246, 0.2);
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.cal-day.active {
    background: var(--accent-color);
    color: white;
    font-weight: bold;
}

@media (max-width: 600px) {
    .class-card {
        flex-direction: column;
        gap: 0.75rem;
    }

    .class-time {
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
        padding-right: 0;
        padding-bottom: 0.75rem;
    }

    .current-date {
        font-size: 0.85rem;
        padding: 0.5rem 0.25rem;
        white-space: nowrap;
    }
}