/* ============================================
   HotKlick Web-App - Main Styles
   ============================================ */

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --secondary: #FF9800;
    --success: #4CAF50;
    --danger: #F44336;
    --warning: #FFC107;
    --dark: #212121;
    --light: #F5F5F5;
    --gray: #757575;
    --white: #FFFFFF;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 6px 12px rgba(0,0,0,0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--light);
    color: var(--dark);
    overflow: hidden;
    line-height: 1.5;
}

/* ============================================
   App Header
   ============================================ */
.app-header {
    background-color: var(--primary);
    color: var(--white);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.app-title {
    font-size: 20px;
    font-weight: 500;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ============================================
   Main Container
   ============================================ */
.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Screen Management
   ============================================ */
.screen {
    display: none;
    flex: 1;
    overflow: hidden;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

/* Canvas Screen hat spezielles Layout */
#canvasScreen {
    /* Kein display hier - wird von .screen gesteuert */
}

#canvasScreen.active {
    overflow: auto; /* Ermöglicht Scrolling für Textbox */
    display: flex !important;
    flex-direction: column !important;
    height: 100%;
}

/* ============================================
   Home Screen
   ============================================ */
.home-screen {
    padding: var(--spacing-xl);
}

.home-screen h2 {
    margin-bottom: var(--spacing-lg);
    font-size: 24px;
    font-weight: 500;
}

.exercise-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.exercise-card {
    background: var(--white);
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: transform var(--transition-fast), 
                box-shadow var(--transition-fast);
    position: relative;
}

.exercise-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.exercise-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    background-color: var(--light);
}

.exercise-name {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--dark);
}

.exercise-meta {
    font-size: 14px;
    color: var(--gray);
}

/* Delete Button auf Exercise Card */
.delete-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 32px;
    height: 32px;
    border: none;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    transition: all 0.2s ease;
    z-index: 10;
}

.delete-btn:hover {
    background: #f44336;
    transform: scale(1.1);
}

.delete-btn:active {
    transform: scale(0.95);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
    text-align: center;
    padding: 60px var(--spacing-xl);
    color: var(--gray);
    grid-column: 1 / -1;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Canvas Screen
   ============================================ */
.canvas-screen {
    background-color: var(--white);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.canvas-toolbar {
    background-color: var(--light);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid #E0E0E0;
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 8px;
    min-height: 0;
    max-height: calc(100vh - 56px - 60px - 150px);
}

#drawingCanvas {
    border: 2px solid var(--gray);
    background: var(--white);
    cursor: crosshair;
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
    transition: transform 0.1s ease;
    touch-action: none;
    object-fit: contain;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    padding: 10px var(--spacing-xl);
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    text-transform: uppercase;
    font-family: inherit;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.btn-secondary:hover {
    background-color: #F57C00;
}

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

.btn-danger:hover {
    background-color: #D32F2F;
}

.btn-save-warning {
    background-color: #F44336;
    color: var(--white);
    padding: 10px var(--spacing-xl);
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    text-transform: uppercase;
    font-family: inherit;
    box-shadow: 0 2px 4px rgba(244, 67, 54, 0.3);
    animation: pulse-save 2s infinite;
}

.btn-save-warning:hover {
    background-color: #D32F2F;
    box-shadow: 0 4px 8px rgba(244, 67, 54, 0.4);
}

.btn-save-warning:active {
    transform: scale(0.98);
}

@keyframes pulse-save {
    0%, 100% {
        box-shadow: 0 2px 4px rgba(244, 67, 54, 0.3);
    }
    50% {
        box-shadow: 0 4px 12px rgba(244, 67, 54, 0.6);
    }
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--white);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: background-color var(--transition-fast);
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ============================================
   FAB (Floating Action Button)
   ============================================ */
.fab {
    position: fixed;
    bottom: var(--spacing-xxl);
    right: var(--spacing-xxl);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--secondary);
    color: var(--white);
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-fast), 
                box-shadow var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

.fab:active {
    transform: scale(0.95);
}

/* ============================================
   Mode Toggle
   ============================================ */
.mode-toggle {
    display: flex;
    background-color: var(--white);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #E0E0E0;
}

.mode-toggle button {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    white-space: nowrap;
}

.mode-toggle button.active {
    background-color: var(--primary);
    color: var(--white);
}

/* Editiermodus-Button in Grün */
#btnEditMode.active {
    background-color: var(--success);
}

#btnEditMode:hover:not(.active) {
    background-color: rgba(76, 175, 80, 0.1);
}

.mode-toggle button:hover:not(.active) {
    background-color: rgba(0, 0, 0, 0.05);
}

/* ============================================
   Radius Controls
   ============================================ */
.radius-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 4px;
    border: 1px solid #E0E0E0;
}

.radius-controls.hidden {
    display: none !important;
}

#radiusDisplay {
    font-weight: 500;
    min-width: 45px;
    text-align: center;
    font-size: 14px;
}

/* ============================================
   Deepening Controls
   ============================================ */
.deepening-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--white);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 4px;
    border: 1px solid #E0E0E0;
}

.deepening-controls.hidden {
    display: none !important;
}

.btn-icon-small {
    background-color: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    transition: background-color var(--transition-fast);
}

.btn-icon-small:hover {
    background-color: var(--primary-dark);
}

.btn-icon-small:active {
    transform: scale(0.95);
}

/* ============================================
   Modal / Dialog
   ============================================ */
   
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex !important;
}

.modal-content {
    background: var(--white);
    border-radius: 8px;
    padding: var(--spacing-xxl);
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow: auto;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    color: var(--dark);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

/* ============================================
   Form Elements
   ============================================ */
input[type="text"],
input[type="file"],
textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid #E0E0E0;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    margin-bottom: var(--spacing-md);
    transition: border-color var(--transition-fast);
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
}

textarea {
    min-height: 100px;
    resize: vertical;
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 14px;
    color: var(--dark);
}

/* ============================================
   Hotspot Colors
   ============================================ */
.hotspot-red {
    fill: rgba(244, 67, 54, 0.6);
    stroke: #F44336;
}

.hotspot-yellow {
    fill: rgba(255, 193, 7, 0.6);
    stroke: #FFC107;
}

.hotspot-blue {
    fill: rgba(33, 150, 243, 0.6);
    stroke: #2196F3;
}

.hotspot-green {
    fill: rgba(76, 175, 80, 0.6);
    stroke: #4CAF50;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .exercise-list {
        grid-template-columns: 1fr;
    }
    
    .canvas-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .canvas-toolbar input[type="text"] {
        margin: 0;
    }
    
    .mode-toggle {
        width: 100%;
    }
    
    .mode-toggle button {
        flex: 1;
        font-size: 12px;
        padding: var(--spacing-sm);
    }
    
    .fab {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
    }
    
    .canvas-container {
        max-height: calc(100vh - 56px - 100px - 150px);
    }
    
    #drawingCanvas {
        max-height: calc(100vh - 56px - 100px - 150px);
    }
    
    #deepeningQuestion {
        min-height: 90px;
        max-height: 25vh;
        padding: 10px 14px;
    }
    
    #deepeningQuestion > div {
        padding: 14px;
        font-size: 15px;
        min-height: 70px;
    }
    
    #questionText {
        font-size: 15px;
        line-height: 1.4;
    }
    
    #btnCloseText {
        padding: 5px 10px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .app-title {
        font-size: 18px;
    }
    
    .home-screen {
        padding: var(--spacing-md);
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
}

/* ============================================
   Textbox (Deepening Question) - RESPONSIVE FIX
   ============================================ */
#deepeningQuestion {
    flex-shrink: 0;
    min-height: 100px;
    max-height: 30vh;
    padding: 12px 16px;
    background: #F5F5F5;
    border-top: 1px solid #E0E0E0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
}

#deepeningQuestion > div {
    background: white;
    padding: 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #2196F3;
    position: relative;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#questionText {
    flex: 1;
    text-align: center;
    line-height: 1.5;
    padding: 8px 40px 8px 8px;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

#btnCloseText {
    position: absolute;
    top: 8px;
    right: 8px;
    background: #F44336;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-weight: 500;
}

#btnCloseText:hover {
    background: #D32F2F;
}

#btnCloseText:active {
    transform: scale(0.95);
}

/* ============================================
   Help Button (unten links)
   ============================================ */
.fab-help {
    position: fixed;
    bottom: 24px;
    left: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: #757575;
    color: white;
    border: none;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    z-index: 100;
}

.fab-help:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
    background-color: #616161;
}

.fab-help:active {
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .fab-help {
        bottom: 16px;
        left: 16px;
        width: 44px;
        height: 44px;
        font-size: 22px;
    }
}