/**
 * Curator - Stylesheet
 * Apple-inspired minimal aesthetic
 * SF System fonts, clean lines, subtle shadows
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors - Clean, light */
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F5F5F7;
    --color-bg-tertiary: #E8E8ED;
    --color-surface: #FFFFFF;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-strong: rgba(0, 0, 0, 0.12);
    
    --color-text: #1D1D1F;
    --color-text-secondary: #6E6E73;
    --color-text-tertiary: #86868B;
    
    --color-accent: #0071E3;
    --color-accent-hover: #0077ED;
    --color-success: #34C759;
    --color-warning: #FF9500;
    --color-error: #FF3B30;
    
    /* Typography - System fonts (no condensed) */
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Radii - Apple-like soft corners */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    
    /* Shadows - Subtle, layered */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* Layout */
    --header-height: 52px;
    --sidebar-width: 320px;
    --sidebar-collapsed: 0px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::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-sans);
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }
h4 { font-size: 1rem; }

.text-sm { font-size: 0.8125rem; }
.text-xs { font-size: 0.75rem; }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 100%;
    padding: 0 var(--space-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 1.0625rem;
    color: var(--color-text);
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
}

.logo-mark {
    width: 26px;
    height: 26px;
    background: var(--color-text);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-mark svg {
    width: 16px;
    height: 16px;
    color: white;
}

.header-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.image-counter {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-badge {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 7px 14px;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

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

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

.btn-secondary:hover {
    background: var(--color-bg-tertiary);
}

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

.btn-ghost {
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    color: var(--color-text);
    background: var(--color-bg-secondary);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
}

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

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

/* ============================================
   Form Elements
   ============================================ */
.input-group {
    margin-bottom: var(--space-lg);
}

.input-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: var(--space-sm);
}

.input {
    width: 100%;
    padding: 10px 12px;
    font-size: 0.9375rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    color: var(--color-text);
}

.input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.input::placeholder {
    color: var(--color-text-tertiary);
}

textarea.input {
    min-height: 100px;
    resize: vertical;
    line-height: 1.5;
}

.helper-text {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-md);
}

.helper-text.small {
    margin-top: var(--space-sm);
    margin-bottom: 0;
}

/* ============================================
   Editor Layout - LEFT SIDEBAR
   ============================================ */
.page {
    padding-top: var(--header-height);
    min-height: 100vh;
}

.editor {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: calc(100vh - var(--header-height));
    transition: grid-template-columns var(--transition-normal);
}

/* ============================================
   Left Sidebar
   ============================================ */
.editor-sidebar {
    position: relative;
    width: var(--sidebar-width);
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-normal), transform var(--transition-normal);
    overflow: hidden;
}

.editor-sidebar.collapsed {
    width: 0;
    border-right: none;
}

.editor-sidebar.collapsed .sidebar-inner {
    opacity: 0;
    pointer-events: none;
}

.sidebar-inner {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: opacity var(--transition-fast);
}

/* Collapse Button */
.sidebar-collapse-btn {
    position: absolute;
    top: 12px;
    right: -14px;
    width: 28px;
    height: 28px;
    background: var(--color-bg);
    border: 1px solid var(--color-border-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.sidebar-collapse-btn:hover {
    background: var(--color-bg-secondary);
}

.sidebar-collapse-btn svg {
    transition: transform var(--transition-fast);
}

.editor-sidebar.collapsed .sidebar-collapse-btn {
    right: -40px;
}

/* Resize Handle */
.sidebar-resize-handle {
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    cursor: ew-resize;
    background: transparent;
    transition: background var(--transition-fast);
}

.sidebar-resize-handle:hover {
    background: var(--color-accent);
}

/* Sidebar Tabs */
.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--space-md);
}

.sidebar-tab {
    flex: 1;
    padding: var(--space-md) var(--space-sm);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-tab:hover {
    color: var(--color-text-secondary);
}

.sidebar-tab.active {
    color: var(--color-text);
    border-bottom-color: var(--color-text);
}

/* Sidebar Panels */
.sidebar-panel {
    display: none;
    flex: 1;
    overflow: hidden;
}

.sidebar-panel.active {
    display: flex;
    flex-direction: column;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-lg);
}

/* ============================================
   Search Gate (Sign-in required)
   ============================================ */
.search-gate {
    text-align: center;
    padding: var(--space-xl) var(--space-md);
}

.search-gate-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-gate-icon svg {
    color: var(--color-text-tertiary);
}

.search-gate h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.search-gate p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

.search-gate-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.search-gate-form .input {
    text-align: center;
}

.search-gate-form .btn {
    width: 100%;
    padding: 12px;
}

/* ============================================
   Search Bar
   ============================================ */
.search-bar {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.search-bar .input {
    flex: 1;
}

/* ============================================
   Image Bucket
   ============================================ */
.image-bucket {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.bucket-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-2xl) var(--space-md);
    color: var(--color-text-tertiary);
}

.bucket-placeholder p:first-child {
    margin-bottom: var(--space-xs);
}

.bucket-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: grab;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.bucket-item:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.bucket-item:active {
    cursor: grabbing;
}

.bucket-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.bucket-item-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.bucket-item:hover .bucket-item-overlay {
    opacity: 1;
}

.bucket-item-actions {
    position: absolute;
    bottom: var(--space-sm);
    right: var(--space-sm);
    display: flex;
    gap: var(--space-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.bucket-item:hover .bucket-item-actions {
    opacity: 1;
}

.bucket-action {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.9);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.bucket-action:hover {
    background: white;
    transform: scale(1.05);
}

/* ============================================
   Settings Controls
   ============================================ */
.ratio-buttons {
    display: flex;
    gap: var(--space-sm);
}

.ratio-buttons .btn {
    flex: 1;
}

.color-picker {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.color-swatch {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-strong);
    overflow: hidden;
    cursor: pointer;
    position: relative;
}

.color-swatch input[type="color"] {
    position: absolute;
    inset: -10px;
    width: 150%;
    height: 150%;
    cursor: pointer;
    opacity: 0;
}

.color-presets {
    display: flex;
    gap: var(--space-xs);
}

.color-preset {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-strong);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.color-preset:hover {
    transform: scale(1.1);
}

.color-preset.active {
    box-shadow: 0 0 0 2px var(--color-accent);
}

.filter-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.filter-option {
    padding: 10px var(--space-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-align: center;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-option:hover {
    background: var(--color-bg-tertiary);
}

.filter-option.active {
    background: var(--color-text);
    color: white;
    border-color: var(--color-text);
}

/* ============================================
   Palette
   ============================================ */
.palette {
    display: flex;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.palette-color {
    flex: 1;
    height: 40px;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.palette-color:hover {
    transform: scaleY(1.1);
    z-index: 1;
}

.palette-empty {
    height: 40px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.export-buttons {
    display: flex;
    gap: var(--space-sm);
}

.export-buttons .btn {
    flex: 1;
}

/* ============================================
   Canvas Area
   ============================================ */
.editor-canvas-area {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    background: var(--color-bg-secondary);
    min-height: calc(100vh - var(--header-height));
}

.editor-canvas {
    position: relative;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.editor-canvas.square {
    aspect-ratio: 1/1;
    width: min(70vh, 100%);
}

.editor-canvas.landscape {
    aspect-ratio: 16/9;
    width: 100%;
    max-width: min(80vh * 16/9, 100%);
}

.editor-canvas.portrait {
    aspect-ratio: 4/5;
    width: min(64vh, 100%);
}

.canvas-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
    pointer-events: none;
}

.canvas-placeholder svg {
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.canvas-placeholder p {
    font-size: 0.9375rem;
}

/* Canvas Items */
.canvas-item {
    position: absolute;
    cursor: move;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.canvas-item:hover {
    border-color: var(--color-accent);
}

.canvas-item.selected {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.2);
}

.canvas-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
    border-radius: calc(var(--radius-sm) - 2px);
}

.canvas-item-controls {
    position: absolute;
    top: -36px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 2px;
    padding: 4px;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.canvas-item.selected .canvas-item-controls {
    opacity: 1;
}

.canvas-item-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.canvas-item-btn:hover {
    color: var(--color-text);
    background: var(--color-bg-secondary);
}

.canvas-item-btn.delete:hover {
    color: var(--color-error);
    background: rgba(255, 59, 48, 0.1);
}

/* Resize handles */
.resize-handle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: white;
    border: 2px solid var(--color-accent);
    border-radius: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.canvas-item.selected .resize-handle {
    opacity: 1;
}

.resize-handle.nw { top: -5px; left: -5px; cursor: nwse-resize; }
.resize-handle.ne { top: -5px; right: -5px; cursor: nesw-resize; }
.resize-handle.sw { bottom: -5px; left: -5px; cursor: nesw-resize; }
.resize-handle.se { bottom: -5px; right: -5px; cursor: nwse-resize; }

/* Snap guides */
.snap-guide {
    position: absolute;
    background: var(--color-accent);
    pointer-events: none;
    z-index: 1000;
}

.snap-guide.horizontal {
    height: 1px;
    left: 0;
    right: 0;
}

.snap-guide.vertical {
    width: 1px;
    top: 0;
    bottom: 0;
}

/* Filter effects */
.filter-grayscale { filter: grayscale(100%); }
.filter-sepia { filter: sepia(80%); }
.filter-desaturated { filter: grayscale(50%) brightness(1.05); }

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 2000;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 12px var(--space-lg);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success { border-left: 3px solid var(--color-success); }
.toast.error { border-left: 3px solid var(--color-error); }
.toast.warning { border-left: 3px solid var(--color-warning); }

/* ============================================
   Gallery & Other Pages
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.gallery {
    padding: var(--space-2xl) 0;
}

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

.gallery-title {
    font-size: 1.5rem;
    font-weight: 600;
}

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

.board-card {
    position: relative;
    aspect-ratio: 4/3;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    background: var(--color-bg-secondary);
}

.board-card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.board-card:hover .board-card-image {
    transform: scale(1.05);
}

.board-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.board-card:hover .board-card-overlay {
    opacity: 1;
}

.board-card-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    color: white;
    transform: translateY(8px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.board-card:hover .board-card-content {
    transform: translateY(0);
    opacity: 1;
}

.board-card-title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.board-card-meta {
    font-size: 0.8125rem;
    opacity: 0.8;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .editor {
        grid-template-columns: 1fr;
    }
    
    .editor-sidebar {
        position: fixed;
        top: var(--header-height);
        left: 0;
        bottom: 0;
        z-index: 50;
        box-shadow: var(--shadow-lg);
    }
    
    .editor-sidebar.collapsed {
        transform: translateX(-100%);
    }
    
    .sidebar-collapse-btn {
        right: -44px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 48px;
        --sidebar-width: 100%;
    }
    
    .header-center {
        display: none;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
}