:root {
    /* LIGHT MODE */
    --bg-main: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-glass-hover: rgba(255, 255, 255, 0.9);
    --border-glass: rgba(0, 0, 0, 0.08);
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --accent: #c026d3;
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    
    --input-bg: rgba(255, 255, 255, 0.8);
    --input-bg-focus: rgba(255, 255, 255, 1);
    --input-text: #0f172a;
    
    --gradient-bg-1: rgba(99, 102, 241, 0.1);
    --gradient-bg-2: rgba(217, 70, 239, 0.1);
    
    --btn-outline-text: #4f46e5;
    --btn-outline-bg: rgba(79, 70, 229, 0.1);
    --btn-outline-border: rgba(79, 70, 229, 0.3);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.3);
    
    --font-family: 'Outfit', system-ui, sans-serif;
    
    --toast-bg: rgba(255, 255, 255, 0.95);
    --toast-text: #0f172a;
    --json-bg: rgba(255, 255, 255, 0.9);
    --json-text: #15803d;
    --json-border: rgba(21, 128, 61, 0.2);
    --glass-footer-bg: rgba(255, 255, 255, 0.85);
    --summary-bg: rgba(99, 102, 241, 0.1);
}

html.dark {
    /* DARK MODE */
    --bg-main: #09090b;
    --bg-glass: rgba(24, 24, 27, 0.6);
    --bg-glass-hover: rgba(39, 39, 42, 0.8);
    --border-glass: rgba(255, 255, 255, 0.08);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --accent: #d946ef;
    
    --input-bg: rgba(0, 0, 0, 0.2);
    --input-bg-focus: rgba(0, 0, 0, 0.4);
    --input-text: #ffffff;
    
    --gradient-bg-1: rgba(99, 102, 241, 0.15);
    --gradient-bg-2: rgba(217, 70, 239, 0.15);

    --btn-outline-text: #a5b4fc;
    --btn-outline-bg: rgba(99, 102, 241, 0.1);
    --btn-outline-border: rgba(99, 102, 241, 0.3);
    
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);
    
    --toast-bg: rgba(15, 23, 42, 0.95);
    --toast-text: #ffffff;
    --json-bg: rgba(0, 0, 0, 0.5);
    --json-text: #4ade80;
    --json-border: rgba(74, 222, 128, 0.2);
    --glass-footer-bg: rgba(15, 23, 42, 0.85);
    --summary-bg: rgba(99, 102, 241, 0.15);
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, var(--gradient-bg-1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, var(--gradient-bg-2) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* SCROLLBAR */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(150, 150, 150, 0.3);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(150, 150, 150, 0.5);
}

/* GLASSMORPHISM UTILS */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-glass);
}

/* TOAST */
.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.history-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    position: relative; /* Para posicionar el botón de borrado */
}

.history-item:hover {
    transform: translateY(-2px);
    background: var(--border-color);
}

.delete-history-btn {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #ff4757;
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    z-index: 10;
}

.history-item:hover .delete-history-btn {
    opacity: 1;
}

.delete-history-btn:hover {
    transform: scale(1.1);
    background: #ff6b81;
}

.toast {
    background: var(--toast-bg);
    border: 1px solid var(--border-glass);
    color: var(--toast-text);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 12px;
    backdrop-filter: blur(8px);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    transform-origin: top right;
}
.toast.error {
    border-left: 4px solid var(--error);
}
.toast.success {
    border-left: 4px solid #10b981;
}
.toast.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(100%) scale(0.9); }
    to { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes fadeOut {
    to { opacity: 0; transform: translateY(-10px); }
}

/* NAVBAR */
.navbar {
    padding: 10px 24px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border-top: none;
    min-height: 66px;
    gap: 16px;
}

.navbar-brand-logo {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.header-logo-gif {
    height: 46px;
    max-height: 50px;
    width: auto;
    object-fit: contain;
    display: block;
    transition: transform 0.2s ease, filter 0.2s ease;
}

.header-logo-gif:hover {
    transform: scale(1.03);
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    justify-self: center;
    text-align: center;
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-glow);
    flex-shrink: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    white-space: nowrap;
}
.logo-pro {
    font-size: 0.8rem;
    background: linear-gradient(to right, var(--primary), var(--accent));
    padding: 2px 6px;
    border-radius: 4px;
    color: white;
    vertical-align: top;
    margin-left: 4px;
}

.nav-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
    flex-wrap: wrap;
    justify-self: end;
}

@media (max-width: 992px) {
    .navbar {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        padding: 10px 16px;
        gap: 12px;
    }
    .navbar-brand-logo {
        order: 1;
    }
    .nav-actions {
        order: 2;
    }
    .logo-container {
        order: 3;
        width: 100%;
        justify-content: center;
    }
    .logo {
        font-size: 1.25rem;
        white-space: normal;
        text-align: center;
    }
    .header-logo-gif {
        height: 40px;
    }
}

@media (max-width: 480px) {
    .header-logo-gif {
        height: 34px;
    }
    .logo {
        font-size: 1.1rem;
    }
    .nav-actions {
        gap: 8px;
    }
}

/* THEME TOGGLE */
.btn-icon {
    background: var(--input-bg);
    border: 1px solid var(--border-glass);
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.btn-icon:hover {
    background: var(--input-bg-focus);
    transform: scale(1.05);
}

/* API KEY INPUT IN PANEL */
.api-key-section {
    background: var(--summary-bg);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 16px 20px;
}
.api-key-label {
    display: block;
    margin-bottom: 8px;
    color: var(--primary);
    font-weight: 700;
}
.api-key-wrapper-panel {
    position: relative;
    display: flex;
    align-items: center;
}
.api-key-wrapper-panel .key-icon {
    position: absolute;
    left: 12px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}
.api-key-wrapper-panel input {
    width: 100%;
    padding-left: 40px;
    background: var(--bg-main);
}
.api-key-wrapper-panel input:focus {
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

/* BUTTONS */
button {
    cursor: pointer;
    border: none;
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    padding: 8px 16px;
}
.btn-ghost:hover {
    color: var(--text-main);
    background: var(--input-bg);
}

.btn-outline {
    background: var(--btn-outline-bg);
    color: var(--btn-outline-text);
    border: 1px solid var(--btn-outline-border);
    padding: 8px 16px;
}
.btn-outline:hover {
    background: var(--gradient-bg-1);
    border-color: var(--primary);
}

.btn-generate {
    width: 100%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 16px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: var(--radius-md);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    letter-spacing: 0.5px;
}
.btn-glow {
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(217, 70, 239, 0.4), inset 0 1px 0 rgba(255,255,255,0.3);
}

.btn-download {
    background: var(--text-main);
    color: var(--bg-main);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
}
.btn-glow-secondary {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.btn-glow-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

/* MAIN LAYOUT */
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 16px;
    display: flex;
    flex-direction: column-reverse; /* Preview on top, controls below on mobile */
    gap: 24px;
}

@media (min-width: 1024px) {
    .container {
        flex-direction: row;
        align-items: flex-start;
        height: calc(100vh - 100px);
        padding: 24px;
    }
}

.panel {
    border-radius: var(--radius-xl);
}

.left-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    min-width: 0;
}

@media (min-width: 1024px) {
    .left-panel {
        flex: 0 0 45%;
        height: 100%;
        overflow-y: auto;
        overflow-x: hidden;
        min-width: 0;
    }
}

.form-content {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

@media (min-width: 1024px) {
    .form-content {
        padding: 24px;
    }
}

/* ACCORDIONS (DETAILS) */
details.form-section {
    background: var(--input-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: background 0.3s;
}
details.form-section:hover {
    background: var(--input-bg-focus);
}
details.form-section summary {
    padding: 16px 20px;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    background: var(--summary-bg);
    border-bottom: 1px solid var(--border-glass);
}
details.form-section summary::-webkit-details-marker {
    display: none;
}
details.form-section summary h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}
details.form-section summary .chevron {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: transform 0.3s ease;
}
details[open] summary .chevron {
    transform: rotate(180deg);
}
.form-grid {
    padding: 0 20px 20px 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
    animation: fadeInDown 0.3s ease-out;
}
@media (min-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.input-group.full-width {
    grid-column: 1 / -1;
}

label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

input, select, textarea {
    font-family: var(--font-family);
    font-size: 0.95rem;
    padding: 12px 16px;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    background-color: var(--input-bg);
    color: var(--input-text);
    outline: none;
    transition: all 0.2s;
}
input:focus, select:focus, textarea:focus {
    background-color: var(--input-bg-focus);
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}
select option {
    background: var(--bg-main);
    color: var(--text-main);
}

/* TEMPLATES GRID */
.template-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 0 20px 20px 20px;
    animation: fadeInDown 0.3s ease-out;
}
.template-card {
    background: var(--input-bg);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}
.template-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}
.template-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
    border-bottom: 1px solid var(--border-glass);
}
.template-name {
    padding: 8px 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* JSON EDITOR */
.json-header {
    display: flex;
    align-items: center;
    gap: 12px;
}
.error-badge {
    background: var(--error-bg);
    color: var(--error);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--error);
}
.hidden {
    display: none !important;
}

#json-editor {
    width: calc(100% - 40px);
    margin: 0 20px 20px 20px;
    background-color: var(--json-bg);
    color: var(--json-text);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    border-radius: var(--radius-md);
    padding: 16px;
    border: 1px solid var(--json-border);
}
#json-editor.invalid {
    background-color: var(--error-bg);
    color: var(--error);
    border-color: var(--error);
}

/* STICKY FOOTER FOR GENERATE BUTTON */
.glass-footer {
    position: sticky;
    bottom: 0;
    padding: 20px 24px;
    background: var(--glass-footer-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-glass);
    z-index: 100;
}

/* RIGHT PANEL (PREVIEW) */
.right-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-width: 0;
}

@media (min-width: 1024px) {
    .right-panel {
        flex: 1;
        height: 100%;
        min-width: 0;
    }
}

.preview-container {
    border-radius: var(--radius-xl);
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    min-height: 300px;
    min-width: 0;
}

@media (min-width: 768px) {
    .preview-container {
        min-height: 500px;
    }
}

.state-view {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px;
}

#state-empty {
    color: var(--text-muted);
}
.icon-glow {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--input-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: 0 0 30px rgba(0,0,0,0.05);
}
.icon-placeholder {
    width: 40px;
    height: 40px;
    opacity: 0.5;
}
.title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}
.subtitle {
    font-size: 0.9rem;
    margin-top: 8px;
    opacity: 0.7;
    max-width: 300px;
}

/* PREMIUM LOADING ANIMATION */
#state-loading {
    background: var(--bg-glass-hover);
    backdrop-filter: blur(8px);
    z-index: 10;
}
.glow-text {
    background: linear-gradient(to right, var(--accent), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    font-size: 1.5rem;
    margin-top: 30px;
}

.hexagon-spinner {
    width: 60px;
    height: 60px;
    position: relative;
    animation: rotate-hex 3s infinite linear;
}
.hex-brick {
    position: absolute;
    top: 0;
    left: 20px;
    width: 20px;
    height: 60px;
    background: var(--accent);
    border-radius: 4px;
    box-shadow: var(--shadow-glow);
}
.h2 { transform: rotate(60deg); background: var(--primary); }
.h3 { transform: rotate(-60deg); background: #818cf8; }

@keyframes rotate-hex {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: .7; transform: scale(1.05); }
}

.result-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 5;
}
.preview-container:hover .result-image {
    transform: scale(1.02);
}

.actions-right {
    display: flex;
    justify-content: flex-end;
}

/* HISTORY */
.history-container {
    padding: 20px;
    border-radius: var(--radius-lg);
}
.history-title {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    color: var(--text-main);
}
.history-list {
    display: flex;
    gap: 16px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-snap-type: x mandatory;
}
.history-item {
    scroll-snap-align: start;
    flex-shrink: 0;
    width: 100px;
    cursor: pointer;
    position: relative;
    group: hover;
}
.history-thumb {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    border: 2px solid transparent;
    transition: all 0.3s;
}
.history-item:hover .history-thumb {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}
.history-brand, .history-product {
    font-size: 0.7rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-main);
}

/* BUTTON SPINNER */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}