@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --glass: rgba(255, 255, 255, 0.05);
    --success: #10b981;
    --error: #ef4444;
}

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

body {
    background: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: 
        radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.15) 0, transparent 50%),
        radial-gradient(circle at 100% 100%, rgba(79, 70, 229, 0.1) 0, transparent 50%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

h1, h2, h3 {
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.input {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: white;
    width: 100%;
    outline: none;
    transition: border-color 0.2s;
}

.input:focus {
    border-color: var(--primary);
}

/* Calendar Grid */
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1rem;
    margin-top: 2rem;
}

.day-header {
    text-align: center;
    color: var(--text-muted);
    font-weight: 500;
    padding-bottom: 0.5rem;
}

.day-cell {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    min-height: 120px;
    transition: all 0.2s ease;
}

.day-cell.today {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.hour-slot {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    padding: 0.5rem;
    border-radius: 0.4rem;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.hour-slot:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.hour-slot.available {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.5);
    color: #34d399;
}

.hour-slot.available:hover {
    background: rgba(16, 185, 129, 0.25);
    border-color: var(--success);
}

.hour-slot.booked {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: #f87171;
    cursor: not-allowed;
}

/* Booking List */
.booking-list {
    margin-top: 2rem;
}

.booking-item {
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.booking-info h4 {
    margin-bottom: 0.25rem;
}

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

.meet-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.meet-link:hover {
    text-decoration: underline;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate {
    animation: fadeIn 0.4s ease forwards;
}

/* Response for Tablet & Mobile */
@media (max-width: 768px) {
    .container {
        padding: 1rem 0.75rem;
    }

    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }

    /* Calendar Grids */
    .calendar-grid, .calendar-month-grid {
        gap: 0.15rem;
    }

    .day-cell, .cal-day {
        padding: 0.25rem;
        min-height: 70px;
        border-radius: 0.5rem;
    }

    .day-num {
        font-size: 0.9rem;
    }

    .slot-indicator {
        font-size: 0.55rem;
        line-height: 1;
        margin-top: 0.1rem;
    }

    .hour-slot {
        padding: 0.4rem 0.2rem;
        font-size: 0.75rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1.5rem;
    }

    /* Stack flex-based settings/input groups */
    section .glass-card > div, 
    header > div:last-child {
        flex-direction: column;
        align-items: stretch !important;
        gap: 1rem;
    }

    .booking-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .booking-item div:last-child {
        align-items: flex-start !important;
        width: 100%;
    }

    .modal-content {
        max-width: 95%;
        padding: 1.25rem;
    }

    .month-header {
        padding: 0.5rem;
        justify-content: center;
        width: 100%;
        gap: 0.5rem !important;
    }
    
    .month-header h2, .month-header h3 {
        font-size: 0.9rem;
        min-width: auto;
    }

    .month-header .btn {
        padding: 0.3rem 0.6rem;
    }
}

/* Extra small screens */
@media (max-width: 380px) {
    .container {
        padding: 0.75rem 0.4rem;
    }
    .calendar-month-grid {
        gap: 0.1rem;
    }
    .day-num {
        font-size: 0.8rem;
    }
    .slot-indicator {
        display: none; /* Hide 'szabad' text on extremely small screens to preserve grid */
    }
}