/* Estilos Generales y Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-darker: #06060a;
    --bg-dark: #0c0c14;
    --bg-glass: rgba(18, 18, 30, 0.55);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-active: rgba(192, 132, 252, 0.35);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --primary-grad: linear-gradient(135deg, #a78bfa, #f43f5e);
    --accent: #c084fc;
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --radius-lg: 16px;
    --radius-md: 10px;
    --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    background-color: var(--bg-darker);
    color: var(--text-primary);
    font-family: var(--font-body);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Luces traseras de ambiente (Glow Background) */
.glow-bg {
    position: fixed;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(167, 139, 250, 0.12) 0%, rgba(244, 63, 94, 0.03) 70%, transparent 100%);
    top: -100px;
    right: -100px;
    z-index: -1;
    pointer-events: none;
}

/* Contenedor Principal */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Encabezado */
header {
    text-align: center;
    margin-bottom: 40px;
}

header .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 10px;
}

.logo-img {
    width: min(520px, 90vw);
    height: auto;
    display: block;
    margin: 0 auto 4px;
    filter: drop-shadow(0 0 18px rgba(167, 139, 250, 0.35)) drop-shadow(0 0 40px rgba(244, 63, 94, 0.15));
    transition: filter 0.4s ease;
}

.logo-img:hover {
    filter: drop-shadow(0 0 28px rgba(167, 139, 250, 0.55)) drop-shadow(0 0 60px rgba(244, 63, 94, 0.25));
}

header .logo i {
    font-size: 2.5rem;
    background: var(--primary-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header h1 {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -1px;
}

header h1 span {
    background: var(--primary-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Distintivos de características */
.feature-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 18px;
}

.feat-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-glass);
    padding: 6px 12px;
    border-radius: 20px;
    transition: var(--transition);
}

.feat-badge i {
    color: var(--accent);
    font-size: 0.8rem;
}

.feat-badge:hover {
    color: var(--text-primary);
    border-color: var(--border-glass-active);
    transform: translateY(-1px);
}

/* Layout de la Aplicación */
.app-layout {
    display: grid;
    grid-template-columns: 480px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 968px) {
    .app-layout {
        grid-template-columns: 1fr;
    }
}

/* Paneles Glassmorphism */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-main);
    padding: 30px;
    transition: var(--transition);
}

.glass:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

/* Controles de Formulario */
.form-group {
    margin-bottom: 24px;
}

label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.input-wrapper, .textarea-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon, .textarea-icon {
    position: absolute;
    left: 16px;
    color: var(--text-secondary);
    font-size: 1.1rem;
    pointer-events: none;
}

input[type="text"], textarea, select {
    width: 100%;
    background: rgba(10, 10, 15, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 14px 16px 14px 44px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

textarea {
    resize: vertical;
    padding-top: 14px;
}

.textarea-icon {
    top: 16px;
}

input[type="text"]:focus, textarea:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(192, 132, 252, 0.15);
    background: rgba(10, 10, 15, 0.8);
}

.help-text {
    display: block;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 6px;
}

/* Pestañas (Tabs) */
.tab-container {
    display: flex;
    background: rgba(10, 10, 15, 0.8);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 28px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

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

.tab-btn.active {
    background: var(--primary-grad);
    color: white;
    box-shadow: 0 4px 15px rgba(244, 63, 94, 0.2);
}

/* Grid de Presets de Color */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-top: 8px;
}

.preset-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    border-radius: var(--radius-md);
    padding: 6px;
    border: 1px solid transparent;
    transition: var(--transition);
}

.preset-card:hover {
    background: rgba(255, 255, 255, 0.03);
}

.preset-card.active {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-glass-active);
}

.preset-preview {
    width: 100%;
    aspect-ratio: 1;
    border-radius: 50%;
    margin-bottom: 4px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: var(--transition);
}

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

.preset-label {
    font-size: 0.65rem;
    text-align: center;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    width: 100%;
}

.preset-card.active .preset-label {
    color: var(--accent);
    font-weight: 600;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed var(--border-glass);
    border-radius: var(--radius-md);
    background: rgba(10, 10, 15, 0.4);
    padding: 26px 20px;
    text-align: center;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.upload-zone:hover {
    border-color: var(--accent);
    background: rgba(192, 132, 252, 0.03);
}

.upload-zone input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 2.2rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    transition: var(--transition);
}

.upload-zone:hover .upload-icon {
    color: var(--accent);
    transform: translateY(-4px);
}

.upload-prompt p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.upload-prompt p span {
    color: var(--accent);
    font-weight: 500;
}

.upload-spec {
    font-size: 0.75rem;
    color: rgba(156, 163, 175, 0.6);
}

/* Vista previa de carga */
.upload-preview {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    z-index: 2;
}

.upload-preview img {
    max-height: 180px;
    max-width: 100%;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-glass);
}

.remove-upload-btn {
    background: rgba(244, 63, 94, 0.15);
    border: 1px solid rgba(244, 63, 94, 0.3);
    color: #f87171;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.remove-upload-btn:hover {
    background: rgba(244, 63, 94, 0.3);
    color: white;
}

/* Tarjetas Radio de Opciones */
.image-options {
    margin-top: 20px;
}

.radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 8px;
}

.radio-card {
    cursor: pointer;
}

.radio-card input[type="radio"] {
    display: none;
}

.radio-content {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(10, 10, 15, 0.5);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 12px;
    height: 100%;
    transition: var(--transition);
}

.radio-content i {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.radio-details {
    display: flex;
    flex-direction: column;
}

.radio-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
}

.radio-desc {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.radio-card input[type="radio"]:checked + .radio-content {
    border-color: var(--accent);
    background: rgba(192, 132, 252, 0.05);
}

.radio-card input[type="radio"]:checked + .radio-content i {
    color: var(--accent);
}

/* Slider */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.slider-val {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--accent);
    font-weight: bold;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent);
    transition: var(--transition);
}

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

/* ====== Opciones de Exportación ====== */
.export-options {
    background: rgba(10, 10, 15, 0.4);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 18px;
}

.export-options > label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
}

.export-options > label i {
    color: var(--accent);
}

.sub-control {
    margin-bottom: 16px;
}

.sub-label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.6px;
    margin-bottom: 8px;
}

/* Chips de selección (formato y resolución) */
.chip-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.format-grid .chip {
    flex: 1 1 calc(50% - 4px);
}

.res-grid .chip {
    flex: 1;
}

.chip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 600;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.chip i {
    font-size: 0.85rem;
}

.chip:hover {
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(255, 255, 255, 0.06);
}

.chip.active {
    color: white;
    border-color: transparent;
    background: var(--primary-grad);
    box-shadow: 0 4px 14px rgba(244, 63, 94, 0.25);
}

.chip.active i {
    color: white;
}

.pro-tag {
    font-size: 0.55rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: rgba(255, 215, 0, 0.18);
    color: #ffd700;
    border: 1px solid rgba(255, 215, 0, 0.4);
    padding: 1px 5px;
    border-radius: 6px;
    margin-left: 2px;
}

.chip.active .pro-tag {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

/* Toggle de fondo transparente */
.toggle-row {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 4px 0 0 0;
    cursor: pointer;
}

.toggle-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0;
}

.toggle-text i {
    color: var(--accent);
    margin-right: 4px;
}

.toggle-text small {
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.switch {
    position: relative;
    flex-shrink: 0;
    width: 46px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider-switch {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid var(--border-glass);
    border-radius: 26px;
    transition: var(--transition);
}

.slider-switch::before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    top: 3px;
    background: #fff;
    border-radius: 50%;
    transition: var(--transition);
}

.switch input:checked + .slider-switch {
    background: var(--primary-grad);
    border-color: transparent;
}

.switch input:checked + .slider-switch::before {
    transform: translateX(20px);
}

/* Previsualización de transparencia (patrón ajedrez) */
.canvas-container.transparent-preview {
    background-color: #d8d8d8;
    background-image:
        linear-gradient(45deg, #b8b8b8 25%, transparent 25%),
        linear-gradient(-45deg, #b8b8b8 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #b8b8b8 75%),
        linear-gradient(-45deg, transparent 75%, #b8b8b8 75%);
    background-size: 24px 24px;
    background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}

.canvas-container.transparent-preview #output-image {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Botón Generar */
.generate-btn {
    width: 100%;
    background: var(--primary-grad);
    border: none;
    color: white;
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 700;
    padding: 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-top: 10px;
    box-shadow: 0 4px 20px rgba(244, 63, 94, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(244, 63, 94, 0.45);
}

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

/* Panel de Previsualización Derecho */
.preview-panel {
    display: flex;
    flex-direction: column;
    min-height: 580px;
    height: 100%;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-glass);
    padding-bottom: 12px;
}

.preview-header h2 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
}

.badge {
    background: rgba(192, 132, 252, 0.15);
    border: 1px solid var(--border-glass-active);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.canvas-container {
    flex: 1;
    background: #040407;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    padding: 20px;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    max-width: 320px;
}

.empty-state i {
    font-size: 2.8rem;
    background: var(--primary-grad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.empty-state p {
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Loader */
.loader-container {
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
    box-shadow: 0 0 15px rgba(192, 132, 252, 0.3);
}

.loader-container p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

/* Imagen de Salida */
#output-image {
    max-width: 100%;
    max-height: 600px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.98); }
    to { opacity: 1; transform: scale(1); }
}

/* Botón de Descarga */
.action-buttons {
    margin-top: 20px;
    animation: fadeIn 0.3s ease-out;
}

.action-btn {
    width: 100%;
    border: none;
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 700;
    padding: 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.action-btn.download {
    background: #10b981;
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.25);
}

.action-btn.download:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* Ajustes de imagen (mosaico) */
.img-adjustments {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 14px 16px;
}

.img-adjustments label {
    display: block;
    margin-bottom: 12px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.img-adjustments input[type="range"] {
    width: 100%;
    margin-top: 4px;
}

.reset-adjustments-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 14px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-glass);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.reset-adjustments-btn:hover {
    border-color: var(--border-glass-active);
    color: var(--text-primary);
}

/* Presets de relleno */
.fill-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
}

.fill-preset-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 5px 11px;
    border-radius: 20px;
    border: 1px solid var(--border-glass);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.fill-preset-btn:hover {
    border-color: var(--border-glass-active);
    color: var(--text-primary);
    background: rgba(192, 132, 252, 0.08);
}

.fill-preset-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(192, 132, 252, 0.12);
}

/* Utilidades */
.hidden {
    display: none !important;
}