/* ============================================
   AI NAIL PRO - Professional Stylesheet
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
    --primary: #c832c8;
    --primary-light: #e056e0;
    --primary-dark: #9a249a;
    --accent: #ff6b9d;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --bg-primary: #0a0a0f;
    --bg-secondary: #131320;
    --bg-card: rgba(30, 30, 50, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b80;

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(200, 50, 200, 0.3);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at top left, rgba(200, 50, 200, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(100, 50, 200, 0.1) 0%, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header */
.header {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.header h1 .emoji {
    -webkit-text-fill-color: initial;
    background: none;
}

.header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.app-footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Main Container */
.main-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 100px);
}

/* Image Viewport */
.image-viewport {
    position: relative;
    flex: 1;
    max-width: 900px;
    min-height: 500px;
    height: calc(100vh - 180px);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

.result-image {
    max-width: 100%;
    max-height: 100%;
    display: block;
    image-rendering: -webkit-optimize-contrast;
    user-select: none;
    border-radius: var(--radius-md);
}

.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    padding: 2rem;
    text-align: center;
}

.placeholder-content .icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.placeholder-content p {
    font-size: 1rem;
    max-width: 300px;
}

/* Cursor Ring */
.cursor-ring {
    position: fixed;
    border: 2px solid white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5), inset 0 0 10px rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    pointer-events: none;
    z-index: 9999;
    display: none;
    transform: translate(-50%, -50%);
    transition: border-color 0.2s ease;
}

/* Zoom Controls */
.zoom-controls {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    display: flex;
    gap: 0.5rem;
    z-index: 10;
}

.btn-zoom {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-zoom:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-zoom.reset {
    font-size: 0.75rem;
    font-weight: 600;
    width: auto;
    padding: 0 1rem;
}

/* Loader */
.loader {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 20;
}

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

.loader-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.75rem;
    text-align: center;
}

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

/* Controls Panel */
.controls-panel {
    width: 340px;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    padding: 1.5rem;
}

.controls-panel::-webkit-scrollbar {
    width: 6px;
}

.controls-panel::-webkit-scrollbar-track {
    background: transparent;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--primary-dark);
    border-radius: 3px;
}

/* Section */
.section {
    margin-bottom: 1.5rem;
}

.section:last-child {
    margin-bottom: 0;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary-light);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.section-title .number {
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: white;
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-label span {
    color: var(--primary-light);
    font-weight: 600;
}

/* Color Picker */
.color-picker-wrapper {
    position: relative;
    height: 50px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

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

.color-picker {
    width: 100%;
    height: 100%;
    border: none;
    cursor: pointer;
    padding: 0;
}

/* Range Slider */
.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--text-secondary);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(200, 50, 200, 0.4);
    transition: var(--transition);
}

.range-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.range-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(200, 50, 200, 0.4);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem 1rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-upload {
    background: var(--bg-glass);
    border: 2px dashed var(--border-color);
    color: var(--text-secondary);
}

.btn-upload:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    background: rgba(200, 50, 200, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 15px rgba(200, 50, 200, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(200, 50, 200, 0.4);
}

.btn-pattern {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
}

.btn-pattern:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--danger);
    color: var(--danger);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-toggle {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
}

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

.btn-toggle.active {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

/* Manual Tools */
.manual-tools {
    display: none;
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.manual-tools.visible {
    display: block;
    animation: slideDown 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-buttons {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tool-btn {
    flex: 1;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.tool-btn.brush {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    border-color: var(--success);
}

.tool-btn.brush.active {
    background: var(--success);
    color: white;
}

.tool-btn.eraser {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border-color: var(--danger);
}

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

/* History Controls */
.history-controls {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn-history {
    flex: 1;
    padding: 0.625rem;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Brush Preview */
.brush-preview-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.brush-preview {
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    border: 2px solid var(--primary);
    transition: var(--transition);
}

/* Divider */
.divider {
    height: 1px;
    background: var(--border-color);
    margin: 1rem 0;
}

/* File Input Hidden */
.file-input {
    display: none;
}

/* Example Gallery */
.example-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.example-thumb {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-glass);
}

.example-thumb:hover {
    border-color: var(--primary);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ============================================
   MOBILE RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    .main-container {
        gap: 1rem;
        padding: 1rem;
    }

    .controls-panel {
        width: 300px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .main-container {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        gap: 1rem;
    }

    .image-viewport {
        max-width: 100%;
        min-height: 350px;
        height: 50vh;
        order: 1;
    }

    .controls-panel {
        width: 100%;
        max-height: 50vh;
        overflow-y: auto;
        order: 2;
    }

    .section {
        margin-bottom: 1.25rem;
    }

    .btn {
        padding: 0.75rem;
    }

    .zoom-controls {
        bottom: 0.5rem;
        right: 0.5rem;
    }

    .btn-zoom {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .header h1 {
        font-size: 1.25rem;
    }

    .header p {
        font-size: 0.75rem;
    }

    .image-viewport {
        min-height: 280px;
        height: 45vh;
        border-radius: var(--radius-lg);
    }

    .controls-panel {
        padding: 1rem;
        border-radius: var(--radius-lg);
    }

    .section-title {
        font-size: 0.7rem;
    }

    .form-label {
        font-size: 0.8rem;
    }

    .tool-buttons {
        flex-direction: column;
    }

    .history-controls {
        flex-direction: row;
    }
}

/* Touch-friendly adjustments */
@media (hover: none) and (pointer: coarse) {
    .btn-zoom {
        width: 48px;
        height: 48px;
    }

    .range-slider::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    .btn {
        padding: 1rem;
    }
}