/* ==========================================
   Reve Editor - Premium Photo Editor Styles
   ========================================== */

/* CSS Variables - Design Tokens */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --bg-elevated: #1f1f1f;
    --bg-hover: #2a2a2a;
    --bg-active: #333333;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666666;
    --text-muted: #444444;
    
    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-primary-glow: rgba(99, 102, 241, 0.3);
    
    --accent-success: #22c55e;
    --accent-success-hover: #4ade80;
    --accent-danger: #ef4444;
    --accent-danger-hover: #f87171;
    
    --border-color: #2a2a2a;
    --border-color-hover: #3a3a3a;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-glow: linear-gradient(135deg, #f97316 0%, #eab308 100%);
    --gradient-dither: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-primary-glow);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-md: 15px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Layout */
    --header-height: 60px;
    --sidebar-width: 340px;
}

/* Light Theme Override */
[data-theme="light"] {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #fafafa;
    --bg-elevated: #ffffff;
    --bg-hover: #eeeeee;
    --bg-active: #e0e0e0;
    
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --text-muted: #bbbbbb;
    
    --border-color: #e0e0e0;
    --border-color-hover: #cccccc;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ==========================================
   Base Styles
   ========================================== */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow: hidden;
}

/* ==========================================
   App Container
   ========================================== */

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* ==========================================
   Header
   ========================================== */

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent-primary);
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: 1px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-item {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.nav-item.active {
    color: var(--accent-primary);
    background-color: var(--accent-primary-glow);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.icon-sun { display: block; }
.icon-moon { display: none; }

[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ==========================================
   Main Content
   ========================================== */

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ==========================================
   Canvas Section
   ========================================== */

.canvas-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background-color: var(--bg-primary);
    position: relative;
    overflow: hidden;
    
    /* Checkerboard pattern for transparency */
    background-image: 
        linear-gradient(45deg, var(--bg-tertiary) 25%, transparent 25%),
        linear-gradient(-45deg, var(--bg-tertiary) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--bg-tertiary) 75%),
        linear-gradient(-45deg, transparent 75%, var(--bg-tertiary) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.canvas-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    position: relative;
}

/* Upload Placeholder */
.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    background-color: var(--bg-secondary);
    transition: all var(--transition-normal);
    cursor: pointer;
    max-width: 500px;
}

.upload-placeholder:hover,
.upload-placeholder.drag-over {
    border-color: var(--accent-primary);
    background-color: var(--bg-tertiary);
    box-shadow: var(--shadow-glow);
}

.upload-icon {
    width: 80px;
    height: 80px;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.upload-placeholder:hover .upload-icon {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.upload-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.upload-subtitle {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.upload-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.upload-btn svg {
    width: 20px;
    height: 20px;
}

/* Canvas */
.main-canvas,
.preview-canvas {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.hidden {
    display: none !important;
}

/* Canvas Controls */
.canvas-controls {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-elevated);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background-color: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
}

.control-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

/* ==========================================
   Sidebar
   ========================================== */

.sidebar {
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-hover) transparent;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
}

.sidebar-section {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.section-header svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.section-header h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

/* Image Info */
.image-info {
    margin-bottom: var(--spacing-md);
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
}

.info-label {
    color: var(--text-secondary);
}

.info-value {
    color: var(--text-primary);
    font-weight: 500;
}

/* Sidebar Buttons */
.sidebar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-btn svg {
    width: 18px;
    height: 18px;
}

.sidebar-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.sidebar-btn.primary:hover:not(:disabled) {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.sidebar-btn.secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.sidebar-btn.secondary:hover:not(:disabled) {
    background-color: var(--bg-hover);
    border-color: var(--border-color-hover);
}

.sidebar-btn.success {
    background-color: var(--accent-success);
    color: white;
}

.sidebar-btn.success:hover:not(:disabled) {
    background-color: var(--accent-success-hover);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.sidebar-btn.danger {
    background-color: transparent;
    color: var(--accent-danger);
    border: 1px solid var(--accent-danger);
}

.sidebar-btn.danger:hover:not(:disabled) {
    background-color: var(--accent-danger);
    color: white;
}

/* ==========================================
   Effects Section
   ========================================== */

.effects-section {
    flex: 1;
}

.effect-card {
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.effect-card:hover {
    border-color: var(--border-color-hover);
}

.effect-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.effect-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.effect-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: white;
}

.effect-icon svg {
    width: 20px;
    height: 20px;
}

.dither-icon {
    background: var(--gradient-dither);
}

.glow-icon {
    background: var(--gradient-glow);
}

.effect-name {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

.effect-desc {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-top: 2px;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--bg-hover);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.toggle-slider::before {
    content: "";
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--gradient-primary);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
}

/* Effect Controls */
.effect-controls {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: none;
}

.effect-card:has(input:checked) .effect-controls {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Slider Group */
.slider-group {
    margin-bottom: var(--spacing-md);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.slider-header label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.slider-value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-primary);
    min-width: 45px;
    text-align: right;
}

/* Custom Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-hover);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

/* Radio Group */
.color-options {
    margin-top: var(--spacing-md);
}

.color-option-label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.radio-group {
    display: flex;
    gap: var(--spacing-sm);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-hover);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.radio-option:hover {
    background-color: var(--bg-active);
}

.radio-option input {
    display: none;
}

.radio-option:has(input:checked) {
    background: var(--gradient-primary);
    color: white;
}

/* Color Picker */
.color-picker-group {
    margin-top: var(--spacing-md);
}

.color-picker-group label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.color-picker-wrapper input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    background: none;
    padding: 0;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
}

.color-value {
    font-size: var(--font-size-sm);
    font-family: monospace;
    color: var(--text-secondary);
    background-color: var(--bg-hover);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
}

/* Actions Section */
.actions-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-lg);
    text-align: center;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.sidebar-footer p {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.sidebar-footer .credits {
    margin-top: var(--spacing-xs);
}

.sidebar-footer a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.sidebar-footer a:hover {
    color: var(--accent-primary-hover);
}

/* ==========================================
   Loading Overlay
   ========================================== */

.loading-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--bg-hover);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-overlay p {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
    font-size: var(--font-size-md);
}

/* ==========================================
   Toast Notification
   ========================================== */

.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    transition: transform var(--transition-normal);
    border: 1px solid var(--border-color);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    border-color: var(--accent-success);
}

.toast.error {
    border-color: var(--accent-danger);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 300px;
    }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column-reverse;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        max-height: 50vh;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
    
    .canvas-section {
        height: 50vh;
        padding: var(--spacing-md);
    }
    
    .nav {
        display: none;
    }
    
    .upload-placeholder {
        padding: var(--spacing-lg);
    }
    
    .upload-title {
        font-size: var(--font-size-lg);
    }
    
    .upload-icon {
        width: 60px;
        height: 60px;
    }
}

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

/* ==========================================
   Utility Classes
   ========================================== */

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glow-effect {
    box-shadow: var(--shadow-glow);
}