@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600&display=swap');

:root {
    --primary: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --accent: #10b981;
    --bg-main: #020617;
    --bg-glass: rgba(15, 23, 42, 0.7);
    --border-glass: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --danger: #ef4444;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-premium: 0 20px 50px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-main);
    background-image: radial-gradient(circle at 50% 50%, #1e1b4b 0%, #020617 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
    height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header Estilo Vidrio */
header {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-premium);
}

.logo {
    height: 32px;
    filter: drop-shadow(0 0 8px var(--primary-glow));
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.file-controls {
    display: flex;
    gap: 16px;
    align-items: center;
}

.button-group {
    background: rgba(255, 255, 255, 0.03);
    padding: 4px;
    border-radius: var(--radius-md);
    display: flex;
    gap: 2px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Botones Premium */
[class^="btn-"], .tool-btn {
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #4f46e5);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 15px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--primary-glow);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-danger {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: 10px 20px;
    border-radius: var(--radius-md);
}

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

.btn-undo, .btn-redo, .btn-delete {
    background: transparent;
    color: var(--text-secondary);
    width: 40px;
    height: 40px;
    justify-content: center;
    border-radius: var(--radius-md);
}

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

.btn-delete:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.toolbar {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    display: flex;
    gap: 32px;
    align-items: center;
    box-shadow: var(--shadow-premium);
    flex-wrap: wrap;
    position: relative;
    z-index: 100;
}

.tool-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.tool-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.tool-btn {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 1.4rem;
    justify-content: center;
}

.tool-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.07);
    transform: translateY(-2px);
}

.tool-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: 0 8px 20px var(--primary-glow);
    border-color: var(--primary);
}

#colorPicker {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-glass);
    border-radius: 50%;
    cursor: pointer;
    background: none;
    padding: 0;
    overflow: hidden;
    transition: var(--transition);
}

#colorPicker:hover {
    transform: scale(1.15) rotate(15deg);
    border-color: var(--primary);
}

#colorPicker::-webkit-color-swatch-wrapper { padding: 0; }
#colorPicker::-webkit-color-swatch { border: none; border-radius: 50%; }

/* Canvas Container */
.canvas-container {
    flex: 1;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border-glass);
    padding: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    position: relative;
}

canvas {
    background-color: #000;
    box-shadow: 0 60px 120px rgba(0, 0, 0, 0.9);
    border-radius: 8px;
    image-rendering: auto;
    transition: box-shadow 0.6s ease;
}

/* Dropdown Premium */
.tool-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(40px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    box-shadow: 0 30px 60px rgba(0,0,0,0.6);
    display: none;
    flex-direction: column;
    padding: 8px;
    min-width: 240px;
    z-index: 1000;
}

.dropdown-menu.show {
    display: flex;
    animation: slideUp 0.3s ease;
}

.dropdown-item {
    padding: 12px 18px;
    border-radius: 6px;
    color: var(--text-secondary);
    text-align: left;
    transition: var(--transition);
    background: transparent;
    border: none;
    width: 100%;
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    padding-left: 24px;
}

/* Custom Input Range */
input[type="range"] {
    -webkit-appearance: none;
    width: 140px;
    background: transparent;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    background: var(--primary);
    border-radius: 50%;
    margin-top: -6px;
    box-shadow: 0 0 15px var(--primary-glow);
    cursor: pointer;
    border: 2px solid white;
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

#strokeValue {
    font-weight: 600;
    color: var(--primary);
    font-variant-numeric: tabular-nums;
    width: 30px;
}

/* UI Hints & UX Improvements */
.upload-hint {
    text-align: center;
    color: var(--text-secondary);
    pointer-events: none;
    z-index: 1;
    position: absolute;
    animation: fadeIn 1s ease;
}

.hint-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
    filter: grayscale(1);
}

.upload-hint h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.upload-hint p {
    font-size: 1rem;
    opacity: 0.7;
}

.drag-active {
    background: rgba(99, 102, 241, 0.1) !important;
    border: 2px solid var(--primary) !important;
    border-style: solid !important;
}

.status-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-glass);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 0.9rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-premium);
    display: none;
    z-index: 1000;
}

@media (max-width: 768px) {
    .toolbar {
        flex-direction: row;
        overflow-x: auto;
        justify-content: flex-start;
        padding-bottom: 15px;
    }
    
    .tool-group {
        flex-shrink: 0;
    }
}