:root {
    --color-bg: #f1f5f9;
    /* Slate 100 */
    --color-card: #ffffff;
    /* White */
    --color-primary: #1e3a8a;
    /* Dark Blue */
    --color-accent: #3b82f6;
    /* Bright Blue */
    --color-text-main: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    /* Green for active */
    --color-warning: #f59e0b;
    /* Orange for break/transition */

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    --radius-lg: 16px;
    --radius-md: 8px;
}

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

body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    padding: 20px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

#interactive-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    /* Let clicks pass through */
}

.app-container {
    width: 100%;
    max-width: 600px;
    /* Mobile-first optimized width */
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Header */
.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
}

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

.current-time {
    font-family: monospace;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
    background: white;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* Active Card */
.active-card {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 8px;
    /* Slightly tighter gap */
    position: relative;
    overflow: hidden;
}

.status-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    align-self: flex-start;
    backdrop-filter: blur(4px);
    margin-bottom: 8px;
}

.subject-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
}

.teacher-name {
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.95;
    margin-bottom: 4px;
}

.time-range {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 500;
}

.progress-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    margin-top: 8px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: white;
    width: 0%;
    transition: width 1s linear;
}

.next-up {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-top: 4px;
}

/* Day Selector */
.day-selector {
    display: flex;
    overflow-x: auto;
    gap: 10px;
    padding-bottom: 8px;
    scrollbar-width: none;
    /* Hide scrollbar Firefox */
}

.day-selector::-webkit-scrollbar {
    display: none;
}

.day-btn {
    padding: 8px 16px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.9rem;
    white-space: nowrap;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: 0.2s;
}

.day-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* Schedule List */
.schedule-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Schedule List Item Refresh */
.schedule-item {
    background: var(--color-card);
    padding: 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    display: flex;
    gap: 16px;
    /* Added gap */
    justify-content: flex-start;
    /* Changed alignment */
    align-items: center;
    transition: 0.2s;
}

.schedule-item.active {
    border-color: var(--color-accent);
    background: #eff6ff;
    box-shadow: var(--shadow-md);
    transform: scale(1.02);
}

.item-time {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 600;
    min-width: 90px;
}

.item-content {
    flex: 1;
    text-align: right;
}

.item-subject-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-main);
}

.item-teacher {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.item-index {
    display: none;
    /* Optional: hide index number */
}

/* Empty State */
.no-schedule {
    text-align: center;
    color: var(--color-text-muted);
    padding: 40px;
    background: white;
    border-radius: var(--radius-lg);
}

@media (max-width: 480px) {
    .subject-title {
        font-size: 1.75rem;
    }
}