:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --free-slot-gradient: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    --booked-slot-gradient: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    --own-booking-gradient: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    --night-gradient: linear-gradient(135deg, #37474f 0%, #263238 100%);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background: var(--primary-gradient);
    background-attachment: fixed;
    color: #333;
}
#app {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    max-width: 900px;
    margin: 20px auto;
    text-align: center;
    min-height: 150px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}
#version-info {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 0.7em;
    color: #999;
    background: #f5f5f5;
    padding: 4px 8px;
    border-radius: 4px;
    z-index: 10;
}
#aeroclub-logo {
    max-width: 180px;
    height: auto;
    margin-bottom: 25px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}
h1 {
    color: #2c3e50;
    margin-top: 0;
    font-size: 2.2em;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
h2 {
    color: #34495e;
    font-size: 1.6em;
    font-weight: 500;
}
h3 {
    color: #5f6368;
    font-size: 1.3em;
    margin-top: 25px;
    margin-bottom: 15px;
}
h4 {
    color: #70757a;
    font-size: 1.1em;
    margin-top: 20px;
    margin-bottom: 10px;
}
p {
    margin-bottom: 5px;
}
hr {
    width: 80%;
    margin: 30px 0;
    border: 0;
    border-top: 2px solid #e8eaf6;
}

/* Auth Container */
#auth-container input {
    display: block;
    width: 80%;
    padding: 12px;
    margin: 10px auto;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s ease;
}
#auth-container input:focus {
    outline: none;
    border-color: #667eea;
}
#auth-container button, .user-info-bar button, .new-booking-form button, .date-navigation button {
    background: var(--primary-gradient);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin: 5px;
    font-size: 1em;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}
#auth-container button:hover, .user-info-bar button:hover, .new-booking-form button:hover, .date-navigation button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}
#auth-error-message, #booking-error-message {
    margin-top: 10px;
    font-size: 0.95em;
    color: #d32f2f;
}

/* User Info Bar */
.user-info-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 15px 0;
    margin-bottom: 10px;
    border-bottom: 2px solid #e8eaf6;
}
.user-info-bar h2 {
    margin: 0;
    font-size: 1.4em;
    color: #2c3e50;
}
.user-info-bar button {
    padding: 8px 15px;
    font-size: 0.9em;
    background: var(--secondary-gradient);
}
.user-info-bar button:hover {
    transform: translateY(-2px);
}


/* App Content Sections */
.day-status, .schedule-section {
    width: 100%;
    margin-top: 20px;
}
.disclaimer {
    font-size: 0.85em;
    color: #70757a;
    margin-top: 5px;
}

/* Date Navigation */
.date-navigation {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 15px 0;
    font-size: 1.3em;
    font-weight: 600;
    color: #2c3e50;
}
.date-navigation button {
    background: var(--primary-gradient);
    color: white;
    padding: 10px 18px;
    border-radius: 6px;
    margin: 0 12px;
}
.date-navigation button:hover {
    transform: translateY(-2px);
}

/* Hourly Schedule Table */
#hourly-schedule {
    margin-top: 20px;
    border: 2px solid #e8eaf6;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    background-color: #fcfcfc;
}
.hour-block {
    display: flex;
    border-bottom: 1px solid #f0f0f0;
}
.hour-block:last-child {
    border-bottom: none;
}
.time-label {
    width: 80px;
    flex-shrink: 0;
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9em;
    border-right: 2px solid #e8eaf6;
}
.half-hour-slot {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 8px 10px;
    min-height: 50px;
    box-sizing: border-box;
    position: relative;
    font-size: 0.85em;
    color: #70757a;
    text-align: center;
    transition: all 0.2s ease;
}
.half-hour-slot.free, .half-hour-slot.booked.own-booking-slot {
    cursor: pointer;
}

.half-hour-slot.free:hover {
    background-color: #c8e6c9;
    transform: scale(1.02);
}

.half-hour-slot.free {
    background: var(--free-slot-gradient);
    border-left: 4px solid #4caf50;
}
.half-hour-slot.booked {
    background: var(--booked-slot-gradient);
    border-left: 4px solid #ff9800;
    color: #e65100;
    font-weight: 500;
}
.half-hour-slot.own-booking-slot {
    background: var(--own-booking-gradient);
    border-left: 4px solid #2196f3;
    color: #0d47a1;
    font-weight: 500;
}
.half-hour-slot.booked:hover, .half-hour-slot.own-booking-slot:hover {
    transform: scale(1.02);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.half-hour-slot.free .slot-time-indicator {
    font-size: 0.7em;
    color: #888;
    margin-top: 3px;
    font-weight: normal;
}

.slot-content {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.hobbs-info {
    font-size: 0.75em;
    color: #666;
    margin-top: 3px;
    display: flex;
    gap: 8px;
}
.hobbs-info span {
    background: rgba(255,255,255,0.7);
    padding: 2px 6px;
    border-radius: 4px;
}
.half-hour-slot.night {
    background: var(--night-gradient);
    color: #bbb;
    font-style: italic;
    text-align: center;
    cursor: default;
    border-left: 4px solid #455a64;
}
.half-hour-slot.night .slot-content {
    color: #bbb;
}


/* New Booking Form */
.new-booking-form input {
    padding: 10px;
    margin: 5px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 0.95em;
    transition: border-color 0.3s ease;
}
.new-booking-form input:focus {
    outline: none;
    border-color: #667eea;
}

/* Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 16px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    position: relative;
    animation: slideUp 0.3s ease;
}
@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
.close-button {
    position: absolute;
    right: 15px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    color: #999;
    cursor: pointer;
    transition: color 0.2s ease;
}
.close-button:hover {
    color: #333;
}
.hobbs-display p, .hobbs-form label {
    text-align: left;
    margin: 12px 0;
}
.hobbs-duration {
    font-size: 1.1em;
    color: #667eea;
    font-weight: 600;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #e8eaf6;
}
.hobbs-form {
    margin-top: 20px;
}
.hobbs-form label {
    display: block;
    font-weight: 500;
    color: #34495e;
    margin-top: 15px;
    margin-bottom: 5px;
}
.hobbs-form input {
    width: 100%;
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}
.hobbs-form input:focus {
    outline: none;
    border-color: #667eea;
}
.hobbs-help-text {
    font-size: 0.9em;
    color: #666;
    margin: 15px 0;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 6px;
    text-align: center;
}
.modal-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}
.primary-button, .secondary-button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}
.primary-button {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}
.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}
.secondary-button {
    background: #f5f5f5;
    color: #333;
}
.secondary-button:hover {
    background: #e0e0e0;
}
.danger-button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--secondary-gradient);
    color: white;
    box-shadow: 0 2px 8px rgba(245, 87, 108, 0.3);
}
.danger-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 87, 108, 0.4);
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    #app {
        padding: 15px;
        margin: 10px auto;
        max-width: 100%;
    }
    
    h1 {
        font-size: 1.5em;
    }
    
    h2 {
        font-size: 1.2em;
    }
    
    h3 {
        font-size: 1.1em;
    }
    
    h4 {
        font-size: 1em;
    }
    
    /* Make "Bentornato" text responsive */
    .user-info-bar {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .user-info-bar h2 {
        font-size: clamp(1em, 4vw, 1.4em);
        word-break: break-word;
        width: 100%;
    }
    
    .user-info-bar button {
        width: 100%;
        max-width: 200px;
    }
    
    /* Date navigation */
    .date-navigation {
        flex-direction: column;
        gap: 10px;
        font-size: 1em;
    }
    
    .date-navigation button {
        width: 100%;
        max-width: 200px;
        margin: 5px 0;
    }
    
    .date-navigation span {
        order: -1;
        margin-bottom: 10px;
    }
    
    /* Auth container */
    #auth-container input {
        width: 90%;
    }
    
    #auth-container button, .new-booking-form button {
        width: 90%;
        max-width: 300px;
    }
    
    /* Schedule table */
    .time-label {
        width: 50px;
        font-size: 0.75em;
    }
    
    .half-hour-slot {
        font-size: 0.75em;
        padding: 5px;
        min-height: 35px;
    }
    
    /* Chart */
    .meteo-chart-section canvas {
        max-width: 100% !important;
    }
    
    /* Version info */
    #version-info {
        font-size: 0.6em;
        right: 5px;
        top: 5px;
    }
    
    /* Logo */
    #aeroclub-logo {
        max-width: 120px;
    }
    
    /* Booking form */
    .new-booking-form {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .new-booking-form input {
        width: 90%;
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.3em;
    }
    
    .user-info-bar h2 {
        font-size: clamp(0.9em, 3.5vw, 1.2em);
    }
    
    .time-label {
        width: 40px;
        font-size: 0.7em;
    }
    
    .half-hour-slot {
        font-size: 0.7em;
        padding: 3px;
        min-height: 30px;
    }
}

/* Photo upload and display styles */
.hobbs-form input[type="file"] {
    width: 100%;
    padding: 8px;
    margin: 8px 0;
    border: 2px dashed #667eea;
    border-radius: 8px;
    background: #f8f9fa;
    cursor: pointer;
    font-size: 0.9em;
}

.hobbs-form input[type="file"]:hover {
    background: #e3f2fd;
    border-color: #764ba2;
}

.photo-preview {
    margin: 10px 0;
    text-align: center;
}

.photo-preview img {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    margin-top: 8px;
}

.photo-display {
    margin: 15px 0;
    text-align: center;
}

.photo-display img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.2s;
}

.photo-display img:hover {
    transform: scale(1.05);
}

.photo-preview .remove-photo {
    display: inline-block;
    margin-top: 5px;
    padding: 5px 10px;
    background: #f5576c;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85em;
}

.photo-preview .remove-photo:hover {
    background: #d32f2f;
}

/* Weather Charts Section */
.meteo-chart-section {
    width: 100%;
    margin: 20px 0;
}

.charts-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: flex-start;
    margin: 20px auto;
}

.chart-wrapper {
    flex: 1;
    min-width: 400px;
    max-width: 600px;
    padding: 10px;
    box-sizing: border-box;
}

.chart-wrapper canvas {
    width: 100% !important;
    height: auto !important;
}

@media (max-width: 900px) {
    .charts-container {
        flex-direction: column;
    }
    .chart-wrapper {
        min-width: 100%;
        max-width: 100%;
    }
}

/* Airplane watermark */
#airplane-watermark {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 120px;
    height: auto;
    opacity: 0.8;
    pointer-events: none;
    z-index: 999;
    filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.3));
    transition: opacity 0.3s ease;
}

/* Responsive adjustments for airplane watermark */
@media (max-width: 768px) {
    #airplane-watermark {
        width: 80px;
        bottom: 10px;
        right: 10px;
        opacity: 0.8;
    }
}

@media (max-width: 480px) {
    #airplane-watermark {
        width: 60px;
        opacity: 0.8;
    }
}

/* PDF Download Button */
.pdf-download-section {
    width: 100%;
    margin-top: 30px;
    text-align: center;
    padding: 20px 0;
    border-top: 2px solid #e8eaf6;
}

.pdf-download-button {
    display: inline-block;
    background: var(--primary-gradient);
    color: white;
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.pdf-download-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.6);
    text-decoration: none;
}

.pdf-download-button:active {
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .pdf-download-button {
        font-size: 1em;
        padding: 14px 28px;
    }
}

@media (max-width: 480px) {
    .pdf-download-button {
        font-size: 0.95em;
        padding: 12px 24px;
    }
}
}