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

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    --border: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --success: #22c55e;
    --error: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --radius: 8px;
    --radius-lg: 12px;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

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

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(180deg, var(--surface) 0%, transparent 100%);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1rem;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* Upload Section */
.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
    cursor: pointer;
    transition: all 0.3s ease;
    max-width: 500px;
    width: 100%;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.upload-icon {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-subtext {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.upload-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

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

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

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

.btn-outline:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

/* Editor Section */
.editor-section {
    animation: fadeIn 0.3s ease;
}

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

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.5rem;
    align-items: start;
}

/* Canvas Container */
.canvas-container {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    overflow: hidden;
}

.canvas-wrapper {
    position: relative;
    display: inline-block;
    max-width: 100%;
    max-height: 70vh;
}

#imageCanvas {
    display: block;
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
}

/* Crop Overlay */
.crop-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.crop-box {
    position: absolute;
    border: 2px solid var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    cursor: move;
    pointer-events: auto;
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
}

/* Crop Handles */
.crop-handle {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border: 2px solid white;
    border-radius: 50%;
    pointer-events: auto;
}

.crop-handle.nw { top: -6px; left: -6px; cursor: nw-resize; }
.crop-handle.ne { top: -6px; right: -6px; cursor: ne-resize; }
.crop-handle.sw { bottom: -6px; left: -6px; cursor: sw-resize; }
.crop-handle.se { bottom: -6px; right: -6px; cursor: se-resize; }
.crop-handle.n { top: -6px; left: 50%; transform: translateX(-50%); cursor: n-resize; }
.crop-handle.s { bottom: -6px; left: 50%; transform: translateX(-50%); cursor: s-resize; }
.crop-handle.e { right: -6px; top: 50%; transform: translateY(-50%); cursor: e-resize; }
.crop-handle.w { left: -6px; top: 50%; transform: translateY(-50%); cursor: w-resize; }

/* Controls Panel */
.controls-panel {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Ratio Buttons */
.ratio-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.ratio-btn {
    padding: 0.6rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--surface-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
}

.ratio-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

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

/* Transform Buttons */
.transform-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
}

.transform-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    padding: 0.75rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--surface-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
}

.transform-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

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

/* Dimension Display */
.dimension-display {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    padding: 0.75rem;
    background: var(--surface-hover);
    border-radius: var(--radius);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: row;
    gap: 0.75rem;
}

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

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem 1rem;
    margin-top: auto;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .editor-layout {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        order: -1;
    }

    .ratio-buttons {
        grid-template-columns: repeat(6, 1fr);
    }

    .transform-buttons {
        grid-template-columns: repeat(4, 1fr);
    }

    .action-buttons {
        flex-direction: row;
    }
}

@media (max-width: 600px) {
    .header {
        padding: 1.5rem 1rem;
    }

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

    .upload-area {
        padding: 2rem 1.5rem;
    }

    .ratio-buttons {
        grid-template-columns: repeat(3, 1fr);
    }

    .transform-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .canvas-container {
        min-height: 300px;
    }

    .canvas-wrapper {
        max-height: 50vh;
    }

    #imageCanvas {
        max-height: 50vh;
    }

    .controls-panel {
        padding: 1rem;
    }
}

@media (max-width: 400px) {
    .ratio-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}