:root {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #38bdf8;
    --accent-secondary: #818cf8;
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 16px;
    --success: #4ade80;
    --font-main: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic Background */
.background-globes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.globe {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.globe-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-primary);
    top: -100px;
    left: -100px;
}

.globe-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-secondary);
    bottom: -100px;
    right: -100px;
    animation-delay: -5s;
}

.globe-3 {
    width: 300px;
    height: 300px;
    background: #c084fc;
    top: 40%;
    left: 40%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

/* Layout */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.app-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--card-border);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.app-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
}

.app-header h1 span {
    display: block;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
    font-weight: 400;
}

/* Progress Bar */
.progress-overview {
    max-width: 600px;
    margin: 0 auto;
}

.progress-bar-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(to right, var(--accent-primary), var(--success));
    width: 0%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Schedule Grid */
.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

/* Day Card */
.day-card {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.day-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.2);
}

.day-header {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.day-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.day-hours {
    font-size: 0.85rem;
    color: var(--accent-primary);
    background: rgba(56, 189, 248, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.day-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Time Blocks (Sabah, Öğle, Akşam) */
.time-block h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.time-block h3::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    background: var(--accent-secondary);
    border-radius: 50%;
}

.task-group {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 0.5rem;
}

.subject-title {
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
    display: block;
}

/* Checkboxes */
.task-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 6px;
    transition: background 0.2s;
}

.task-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.task-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-secondary);
    border-radius: 6px;
    margin-top: 2px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.task-checkbox:checked {
    background-color: var(--success);
    border-color: var(--success);
}

.task-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #0f172a;
    font-size: 14px;
    font-weight: bold;
}

.task-label {
    font-size: 0.95rem;
    line-height: 1.4;
    color: var(--text-primary);
    transition: color 0.3s;
}

.task-checkbox:checked + .task-label {
    text-decoration: line-through;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }
    
    .day-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}