/* ========================================
   EYECATCH GENERATOR - MODERN CSS
   ======================================== */

/* CSS Variables */
:root {
    /* Colors - Primary */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;

    /* Colors - Accent */
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;
    --accent-amber: #f59e0b;
    --accent-emerald: #10b981;

    /* Colors - Neutral */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #111827;
        --bg-secondary: #1f2937;
        --bg-tertiary: #374151;
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-tertiary: #9ca3af;
        --border-color: #374151;
        --shadow-color: rgba(0, 0, 0, 0.3);
    }
}

/* Reset */
*, *::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: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--accent-pink) 50%, var(--accent-amber) 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* App Container */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-4);
}

/* Header */
.app-header {
    text-align: center;
    padding: var(--space-8) var(--space-4);
    margin-bottom: var(--space-6);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.app-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: var(--space-2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.title-icon {
    font-size: 1.2em;
}

.app-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Main Content */
.app-main {
    display: grid;
    grid-template-columns: minmax(320px, 400px) 1fr;
    gap: var(--space-6);
    align-items: start;
}

@media (max-width: 1024px) {
    .app-main {
        grid-template-columns: 1fr;
    }
}

/* Sidebar */
.sidebar {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: sticky;
    top: var(--space-4);
}

.sidebar-content {
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    overflow-x: hidden;
}

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

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

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: var(--radius-full);
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* Tabs */
.tabs {
    display: flex;
    background: var(--bg-secondary);
    padding: var(--space-1);
    gap: var(--space-1);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Tab Panels */
.tab-panel {
    display: none;
    padding: var(--space-5);
}

.tab-panel.active {
    display: block;
}

/* Control Group */
.control-group {
    margin-bottom: var(--space-5);
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

/* Inputs */
.control-input,
.control-select,
.control-textarea {
    width: 100%;
    padding: var(--space-3);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.control-input:focus,
.control-select:focus,
.control-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.control-textarea {
    resize: vertical;
    min-height: 80px;
}

/* Range Input */
.range-input {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.range-input input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    cursor: pointer;
}

.range-input input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

.range-input input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.range-input input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
}

.range-value {
    min-width: 3.5rem;
    text-align: right;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

/* Color Palette */
.color-palette {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
}

.color-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.color-field label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
}

.color-input {
    width: 100%;
    height: 40px;
    padding: var(--space-1);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.color-input::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-input::-webkit-color-swatch {
    border: none;
    border-radius: var(--radius-md);
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

.checkbox-label span {
    font-size: 0.875rem;
    font-weight: 500;
}

/* Button Group */
.button-group {
    display: flex;
    background: var(--bg-secondary);
    padding: var(--space-1);
    border-radius: var(--radius-lg);
    gap: var(--space-1);
}

.toggle-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.toggle-btn span {
    display: block;
}

/* Sub Controls */
.sub-controls {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

/* File Input */
.file-input {
    width: 100%;
    padding: var(--space-3);
    background: var(--bg-secondary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* Buttons */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--gray-300);
}

.btn-small {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

.btn-full {
    width: 100%;
}

.btn-icon {
    font-size: 1em;
}

/* Design Grid */
.design-grid,
.shape-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--space-2);
}

.design-preset,
.shape-preset {
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    transition: all var(--transition-fast);
}

.design-preset:hover,
.shape-preset:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.design-preset.selected,
.shape-preset.selected {
    border-color: var(--primary);
    background: var(--primary-50);
    box-shadow: 0 0 0 2px var(--primary);
}

.design-preset-icon,
.shape-preset-icon {
    font-size: 1.5rem;
}

.design-preset-name,
.shape-preset-name {
    font-size: 0.65rem;
    font-weight: 600;
    text-align: center;
    color: var(--text-secondary);
}

/* Canvas Section */
.canvas-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.canvas-wrapper {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--space-4);
    overflow: hidden;
}

#mainCanvas {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    display: block;
}

.download-actions {
    display: flex;
    gap: var(--space-3);
}

.download-actions .btn-primary,
.download-actions .btn-secondary {
    flex: 1;
}

@media (max-width: 640px) {
    .download-actions {
        flex-direction: column;
    }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-5);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-5);
    border-top: 1px solid var(--border-color);
}

/* Utility */
[hidden] {
    display: none !important;
}