/* =============================================
   LA BIBLIO DE PROMTS — Stylesheet
   Tema: Pixel art oscuro con acentos neón
   ============================================= */

/* CSS RESET / BASE */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Paleta de colores */
    --bg-primary: #0d0b1f;
    --bg-secondary: #16142b;
    --bg-tertiary: #1f1c3a;
    --bg-elevated: #28244a;
    --bg-hover: #322e5a;

    --border-color: #3a3565;
    --border-glow: #6c5ce7;

    --text-primary: #e8e6f5;
    --text-secondary: #a39ec5;
    --text-muted: #6e6a8c;

    --accent-primary: #6c5ce7;
    --accent-secondary: #00d9a3;
    --accent-warning: #ffbe76;
    --accent-danger: #ff6b9d;
    --accent-info: #74b9ff;

    --neon-pink: #ff6bcb;
    --neon-cyan: #00d9ff;
    --neon-yellow: #fff56b;
    --neon-green: #6bff7a;
    --neon-purple: #c66bff;

    /* Tipografía */
    --font-pixel: 'Press Start 2P', monospace;
    --font-mono: 'VT323', 'Courier New', monospace;
    --font-ui: 'Inter', -apple-system, sans-serif;

    /* Espaciado */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;

    /* Bordes */
    --border-radius: 4px;
    --border-thick: 3px;

    /* Sombras */
    --shadow-glow: 0 0 12px rgba(108, 92, 231, 0.4);
    --shadow-elevated: 0 4px 12px rgba(0, 0, 0, 0.5);

    /* Tema claro (alternativo) */
    --bg-primary-light: #f0eef8;
    --bg-secondary-light: #e6e2f0;
    --bg-tertiary-light: #d8d2e8;
    --text-primary-light: #1a1730;
    --text-secondary-light: #4a4570;
}

[data-theme="light"] {
    --bg-primary: var(--bg-primary-light);
    --bg-secondary: var(--bg-secondary-light);
    --bg-tertiary: var(--bg-tertiary-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --text-muted: #8a85a3;
    --border-color: #b8b0d0;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-ui);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

/* Background pattern pixelado */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(108, 92, 231, 0.08), transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(0, 217, 163, 0.06), transparent 40%);
    pointer-events: none;
    z-index: 0;
}

/* APP CONTAINER */
.app {
    display: grid;
    grid-template-rows: auto auto 1fr;
    height: 100vh;
    position: relative;
    z-index: 1;
}

/* HEADER */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-secondary);
    border-bottom: var(--border-thick) solid var(--border-color);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.3);
}

.header-content {
    flex: 1;
    min-width: 0;
}

.app-title {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-pixel);
    font-size: 16px;
    color: var(--neon-cyan);
    text-shadow: 0 0 8px rgba(0, 217, 255, 0.5), 2px 2px 0 var(--bg-primary);
    letter-spacing: 1px;
}

.title-icon {
    font-size: 24px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.app-subtitle {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 4px;
    font-family: var(--font-mono);
    font-size: 16px;
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* TABS */
.tabs {
    display: flex;
    background: var(--bg-tertiary);
    border-bottom: var(--border-thick) solid var(--border-color);
    padding: 0 var(--space-md);
    gap: 2px;
}

.tab {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-ui);
    font-size: 14px;
    font-weight: 600;
    position: relative;
    transition: all 0.15s ease;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.tab.active {
    color: var(--neon-cyan);
    background: var(--bg-secondary);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--neon-cyan);
    box-shadow: 0 0 8px var(--neon-cyan);
}

.tab-icon {
    font-size: 18px;
    filter: drop-shadow(0 0 4px currentColor);
}

/* MAIN LAYOUT */
.app-main {
    display: grid;
    grid-template-columns: 300px 1fr 360px;
    gap: var(--space-md);
    padding: var(--space-md);
    overflow: hidden;
    min-height: 0;
}

.panel {
    background: var(--bg-secondary);
    border: var(--border-thick) solid var(--border-color);
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
    box-shadow: var(--shadow-elevated);
}

.panel-header {
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.panel-title {
    font-family: var(--font-pixel);
    font-size: 10px;
    color: var(--neon-yellow);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.panel-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
    min-height: 0;
}

.panel-body::-webkit-scrollbar {
    width: 8px;
}

.panel-body::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.panel-body::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.panel-body::-webkit-scrollbar-thumb:hover {
    background: var(--border-glow);
}

/* SEARCH BOX */
.search-box input {
    width: 100%;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px var(--space-md);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 16px;
    outline: none;
    transition: border-color 0.15s;
    margin-top: var(--space-sm);
}

.search-box input:focus {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 0 2px rgba(0, 217, 255, 0.2);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

/* CATEGORIES (Library) */
.category {
    margin-bottom: var(--space-md);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
}

.category-header:hover {
    background: var(--bg-hover);
    border-color: var(--border-glow);
}

.category-title {
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.category-count {
    background: var(--accent-primary);
    color: white;
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 700;
}

.category-toggle {
    color: var(--neon-cyan);
    transition: transform 0.2s;
}

.category.collapsed .category-toggle {
    transform: rotate(-90deg);
}

.category-body {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xs);
    padding-top: var(--space-sm);
}

.category.collapsed .category-body {
    display: none;
}

/* CHIPS (draggable items) */
.chip {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 6px 10px;
    cursor: grab;
    transition: all 0.15s;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.chip:hover {
    background: var(--bg-hover);
    border-color: var(--neon-cyan);
    transform: translateX(2px);
    box-shadow: 0 0 8px rgba(0, 217, 255, 0.3);
}

.chip:active {
    cursor: grabbing;
    transform: scale(0.97);
}

.chip.dragging {
    opacity: 0.5;
    transform: rotate(2deg);
}

.chip-icon {
    font-size: 14px;
    flex-shrink: 0;
}

.chip-label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chip-hint {
    font-size: 9px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Slot colors */
.chip[data-slot="estilo"] { border-left: 3px solid var(--neon-pink); }
.chip[data-slot="variante"] { border-left: 3px solid var(--neon-cyan); }
.chip[data-slot="situacion"] { border-left: 3px solid var(--neon-yellow); }
.chip[data-slot="bpm"] { border-left: 3px solid var(--neon-purple); }
.chip[data-slot="bitrate"] { border-left: 3px solid var(--neon-green); }
.chip[data-slot="ambiente"] { border-left: 3px solid var(--accent-info); }
.chip[data-slot="instrumento"] { border-left: 3px solid var(--accent-warning); }
.chip[data-slot="sfx"] { border-left: 3px solid var(--accent-danger); }
.chip[data-slot="capa"] { border-left: 3px solid var(--accent-secondary); }
.chip[data-slot="dinamica"] { border-left: 3px solid var(--accent-info); }
.chip[data-slot="referencia"] { border-left: 3px solid var(--neon-pink); }

/* CANVAS */
.canvas {
    min-height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    background: var(--bg-primary);
    position: relative;
    transition: all 0.15s;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.canvas.drag-over {
    border-color: var(--neon-cyan);
    border-style: solid;
    background: rgba(0, 217, 255, 0.05);
    box-shadow: inset 0 0 20px rgba(0, 217, 255, 0.1);
}

.canvas-empty {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-muted);
    pointer-events: none;
    font-family: var(--font-mono);
    font-size: 18px;
}

.canvas.has-chips .canvas-empty {
    display: none;
}

.canvas-empty-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

.canvas-section {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--space-sm);
    background: var(--bg-secondary);
    margin-bottom: var(--space-sm);
}

.canvas-section-title {
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--neon-yellow);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Canvas chip (in the builder) */
.canvas-chip {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    border-radius: var(--border-radius);
    padding: 8px 10px;
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 12px;
    cursor: grab;
    transition: all 0.15s;
    position: relative;
}

.canvas-chip:hover {
    background: var(--bg-hover);
    border-color: var(--neon-cyan);
}

.canvas-chip.dragging {
    opacity: 0.4;
    transform: scale(0.95);
}

.canvas-chip.combined {
    background: linear-gradient(90deg, var(--bg-elevated), rgba(255, 107, 203, 0.1));
}

.canvas-chip-icon {
    font-size: 16px;
    flex-shrink: 0;
}

.canvas-chip-label {
    flex: 1;
    min-width: 0;
}

.canvas-chip-tag {
    background: var(--bg-primary);
    color: var(--text-muted);
    padding: 1px 6px;
    border-radius: 8px;
    font-size: 9px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.canvas-chip-remove {
    background: transparent;
    border: none;
    color: var(--accent-danger);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.15s;
    flex-shrink: 0;
}

.canvas-chip-remove:hover {
    background: var(--accent-danger);
    color: white;
}

.canvas-chip-weight {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 2px 4px;
    border-radius: 3px;
    font-size: 10px;
    width: 36px;
    text-align: center;
    font-family: var(--font-mono);
}

.canvas-chip-weight:focus {
    outline: none;
    border-color: var(--neon-cyan);
}

/* SFX combination */
.canvas-chip.sfx-combo {
    background: linear-gradient(135deg, var(--bg-elevated), rgba(116, 185, 255, 0.15));
    border-left-color: var(--accent-secondary);
}

.sfx-combo-parts {
    font-size: 10px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* FASE 2.1: Canvas grouped by slot */
.canvas-slot-group {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-sm);
    overflow: hidden;
}

.canvas-slot-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px var(--space-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}

.canvas-slot-group-header:hover {
    background: var(--bg-hover);
}

.canvas-slot-group-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 11px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.canvas-slot-group-count {
    background: var(--accent-primary);
    color: white;
    padding: 1px 7px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 700;
    text-transform: none;
}

.canvas-slot-group-toggle {
    color: var(--neon-cyan);
    font-size: 9px;
    transition: transform 0.2s;
}

.canvas-slot-group.collapsed .canvas-slot-group-toggle {
    transform: rotate(-90deg);
}

.canvas-slot-group.collapsed .canvas-slot-group-body {
    display: none;
}

.canvas-slot-group-body {
    padding: var(--space-sm);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

/* FASE 2.6: duplicate indicator */
.canvas-chip-dup {
    background: var(--neon-pink) !important;
    color: white !important;
    padding: 1px 6px;
    border-radius: 10px;
    font-size: 9px;
    font-weight: 700;
    margin-left: 4px;
}

/* ==============================
   VELOCITY / INTENSITY BAR
   ============================== */
.velocity-bar {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-elevated));
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    position: relative;
    transition: all 0.2s;
}

.velocity-bar.locked {
    border-color: var(--accent-warning);
    box-shadow: 0 0 0 1px rgba(255, 190, 118, 0.3);
}

.velocity-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.velocity-title {
    flex: 1;
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--neon-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.velocity-value {
    background: var(--bg-primary);
    color: var(--neon-cyan);
    padding: 2px 8px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: bold;
    min-width: 36px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.velocity-bar.locked .velocity-value {
    color: var(--accent-warning);
    border-color: var(--accent-warning);
}

.velocity-lock-icon {
    color: var(--accent-warning);
    font-size: 16px;
    animation: pulse 2s infinite;
}

.velocity-track-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.velocity-end {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.velocity-end-low { color: var(--neon-purple); }
.velocity-end-high { color: var(--neon-pink); }

.velocity-slider {
    flex: 1;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(90deg,
        var(--neon-purple) 0%,
        var(--accent-info) 30%,
        var(--accent-secondary) 50%,
        var(--neon-yellow) 70%,
        var(--neon-pink) 100%);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    transition: opacity 0.2s;
}

.velocity-bar.locked .velocity-slider {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.velocity-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 4px;
    background: var(--bg-elevated);
    border: 3px solid var(--neon-cyan);
    cursor: grab;
    box-shadow: 0 0 8px rgba(0, 217, 255, 0.5), 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: all 0.15s;
}

.velocity-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 12px rgba(0, 217, 255, 0.7), 0 2px 4px rgba(0, 0, 0, 0.3);
}

.velocity-slider::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.1);
}

.velocity-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    background: var(--bg-elevated);
    border: 3px solid var(--neon-cyan);
    cursor: grab;
    box-shadow: 0 0 8px rgba(0, 217, 255, 0.5);
}

.velocity-bar.locked .velocity-slider::-webkit-slider-thumb {
    border-color: var(--accent-warning);
    box-shadow: 0 0 8px rgba(255, 190, 118, 0.5);
    cursor: not-allowed;
}

.velocity-hint {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    font-size: 11px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.velocity-hint-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.velocity-hint-text {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 12px;
}

.velocity-hint-desc {
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
    flex: 1;
    text-align: right;
}

.velocity-lock-reason {
    margin-top: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 190, 118, 0.1);
    border: 1px solid var(--accent-warning);
    border-radius: var(--border-radius);
    color: var(--accent-warning);
    font-size: 11px;
    font-weight: 600;
    text-align: center;
}

.velocity-bar.locked .velocity-hint {
    background: rgba(255, 190, 118, 0.05);
    border-color: var(--accent-warning);
}

/* ==============================
   SLOT FILTER PILLS (FASE 2.4)
   ============================== */
.slot-filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: var(--space-sm);
    padding: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.slot-pill {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.15s;
    min-width: 28px;
    text-align: center;
}

.slot-pill:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.slot-pill.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: 0 0 6px rgba(108, 92, 231, 0.5);
}

/* ==============================
   FAVORITES (FASE 2.2)
   ============================== */
.category-favorites {
    border: 1px solid var(--neon-yellow) !important;
    box-shadow: 0 0 8px rgba(255, 245, 107, 0.2);
}

.category-favorites .category-title {
    color: var(--neon-yellow);
}

.chip.is-fav {
    background: linear-gradient(90deg, var(--bg-elevated), rgba(255, 245, 107, 0.1));
    border-left-color: var(--neon-yellow) !important;
}

.chip-fav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0 4px;
    font-size: 12px;
    border-radius: 3px;
    transition: all 0.15s;
    flex-shrink: 0;
    line-height: 1;
}

.chip-fav-btn:hover {
    color: var(--neon-yellow);
    background: var(--bg-primary);
    transform: scale(1.2);
}

.chip-fav-btn.active {
    color: var(--neon-yellow);
}

/* ==============================
   PROMPT PREVIEW (FASE 2.5)
   ============================== */
.prompt-preview {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-left: 3px solid var(--neon-green);
    border-radius: var(--border-radius);
    padding: var(--space-sm) var(--space-md);
    margin-bottom: var(--space-md);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.4;
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
    max-height: 60px;
    overflow: hidden;
}

.prompt-preview-label {
    color: var(--neon-green);
    font-weight: 600;
    flex-shrink: 0;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.prompt-preview-text {
    color: var(--text-secondary);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* ==============================
   HISTORY (FASE 3.2)
   ============================== */
.history-section {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--border-color);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 200px;
    overflow-y: auto;
}

.history-item {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 6px var(--space-sm);
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 11px;
    transition: all 0.15s;
}

.history-item:hover {
    background: var(--bg-hover);
    border-color: var(--neon-cyan);
    transform: translateX(2px);
}

.history-tab {
    flex-shrink: 0;
    font-size: 14px;
}

.history-preview {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.history-time {
    color: var(--text-muted);
    font-size: 10px;
    flex-shrink: 0;
}

/* ==============================
   FORM GROUPS (FASE 3.3)
   ============================== */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-textarea {
    font-family: var(--font-mono);
    font-size: 14px;
    min-height: 80px;
    resize: vertical;
    padding: 8px;
}

/* ==============================
   IMPORT SECTION ROW (FASE 3.4)
   ============================== */
.import-section-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.import-section-row .btn {
    font-size: 11px;
    padding: 6px 8px;
}

/* ==============================
   UNDO/REDO BUTTONS
   ============================== */
#btn-undo:disabled,
#btn-redo:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: var(--bg-tertiary);
}

/* ==============================
   REPLACEMENT FIELDS
   ============================== */
.replacement-fields {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-md);
    overflow: hidden;
}

.replacement-fields-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--bg-elevated);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}

.replacement-fields-header:hover {
    background: var(--bg-hover);
}

.replacement-fields-title {
    flex: 1;
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--neon-yellow);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.replacement-fields-count {
    background: var(--bg-primary);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: bold;
    min-width: 24px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.replacement-fields-count.has-value {
    background: var(--neon-green);
    color: var(--bg-primary);
    border-color: var(--neon-green);
}

.replacement-fields-toggle {
    color: var(--neon-cyan);
    transition: transform 0.2s;
    font-size: 10px;
}

.replacement-fields-toggle.up {
    transform: rotate(-90deg);
}

.replacement-fields.collapsed .replacement-fields-body {
    display: none;
}

.replacement-fields-body {
    padding: var(--space-md);
}

.replacement-fields-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    line-height: 1.5;
}

.replacement-fields-hint code {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1px 4px;
    border-radius: 3px;
    color: var(--neon-cyan);
    font-family: var(--font-mono);
    font-size: 11px;
}

.replacement-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-sm);
}

.replacement-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.replacement-label {
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.replacement-label-icon {
    font-size: 12px;
}

.replacement-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.replacement-input {
    width: 100%;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 28px 6px 8px;
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 13px;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.replacement-input:focus {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 0 2px rgba(0, 217, 255, 0.2);
}

.replacement-input::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.replacement-clear {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--accent-danger);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 12px;
    font-weight: bold;
    transition: all 0.15s;
}

.replacement-clear:hover {
    background: var(--accent-danger);
    color: white;
}

/* ==============================
   MISSING HINTS
   ============================== */
.missing-hints {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-elevated));
    border: 2px solid var(--accent-warning);
    border-radius: var(--border-radius);
    margin-top: var(--space-md);
    overflow: hidden;
}

.missing-hints-header {
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 190, 118, 0.1);
    border-bottom: 1px solid var(--accent-warning);
}

.missing-hints-title {
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--accent-warning);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.missing-hints-body {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-height: 280px;
    overflow-y: auto;
}

.missing-hint {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-warning);
    border-radius: var(--border-radius);
    padding: var(--space-sm) var(--space-md);
}

.missing-hint-header {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.missing-hint-icon {
    font-size: 14px;
}

.missing-hint-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 12px;
}

.missing-hint-code {
    background: var(--bg-elevated);
    color: var(--neon-cyan);
    padding: 1px 6px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 10px;
    border: 1px solid var(--border-color);
    margin-left: auto;
}

.missing-hint-text {
    color: var(--text-secondary);
    font-size: 11px;
    margin: 0 0 6px 0;
    line-height: 1.4;
}

.missing-hint-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
    margin-top: 6px;
}

.missing-hint-tags-label {
    font-size: 10px;
    color: var(--text-muted);
    margin-right: 4px;
    font-weight: 600;
}

.missing-hint-tag {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    color: var(--neon-cyan);
    padding: 2px 8px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 11px;
    cursor: pointer;
    transition: all 0.15s;
}

.missing-hint-tag:hover {
    background: var(--neon-cyan);
    color: var(--bg-primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 217, 255, 0.3);
}

.missing-hint-tag:active {
    transform: translateY(0);
}

.missing-hint-tip {
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
    margin: 0;
}

/* Slot hints */
.slot-hints {
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border: 1px dashed var(--border-color);
    font-size: 11px;
    color: var(--text-secondary);
}

.slot-hints-title {
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--neon-yellow);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.slot-hints ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.slot-hints li {
    background: var(--bg-elevated);
    padding: 3px 8px;
    border-radius: 10px;
    font-family: var(--font-mono);
    font-size: 13px;
}

/* PROMPT OUTPUT */
.prompt-output {
    width: 100%;
    min-height: 200px;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--neon-green);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 15px;
    line-height: 1.6;
    resize: vertical;
    outline: none;
    user-select: text;
    transition: border-color 0.15s;
}

.prompt-output:focus {
    border-color: var(--neon-cyan);
}

.prompt-output::placeholder {
    color: var(--text-muted);
}

/* BUTTONS */
.btn {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 14px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-glow);
    transform: translateY(-1px);
}

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

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

.btn-primary:hover {
    background: var(--border-glow);
    border-color: var(--border-glow);
    box-shadow: 0 0 12px rgba(108, 92, 231, 0.4);
}

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

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-icon {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.15s;
}

.btn-icon:hover {
    background: var(--bg-hover);
    border-color: var(--neon-cyan);
    transform: scale(1.05);
}

.canvas-actions,
.output-actions {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

/* PRESETS */
.presets-section,
.defaults-section {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--border-color);
}

.presets-title {
    font-family: var(--font-pixel);
    font-size: 9px;
    color: var(--neon-yellow);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.presets-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.presets-empty {
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
    text-align: center;
    padding: var(--space-md);
}

.preset-item {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 8px var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    cursor: pointer;
    transition: all 0.15s;
    font-size: 12px;
}

.preset-item:hover {
    background: var(--bg-hover);
    border-color: var(--neon-cyan);
    transform: translateX(2px);
}

.preset-item-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.preset-item-actions {
    display: flex;
    gap: 2px;
}

.preset-item-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 11px;
    transition: all 0.15s;
}

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

.preset-item-btn.delete:hover {
    color: var(--accent-danger);
    border-color: var(--accent-danger);
}

/* Import section */
.import-section {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px dashed var(--border-color);
}

/* TOAST */
.toast {
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-elevated);
    border: 2px solid var(--neon-green);
    color: var(--neon-green);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 13px;
    box-shadow: 0 0 16px rgba(107, 255, 122, 0.4), var(--shadow-elevated);
    z-index: 1000;
    transition: transform 0.3s ease;
    pointer-events: none;
    font-family: var(--font-pixel);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    border-color: var(--accent-danger);
    color: var(--accent-danger);
    box-shadow: 0 0 16px rgba(255, 107, 157, 0.4), var(--shadow-elevated);
}

/* MODAL */
.modal {
    position: fixed;
    inset: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
}

.modal[hidden] {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: var(--border-thick) solid var(--border-glow);
    border-radius: var(--border-radius);
    padding: var(--space-xl);
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-elevated), 0 0 24px rgba(108, 92, 231, 0.5);
    z-index: 1;
}

.modal-content-large {
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-title {
    font-family: var(--font-pixel);
    font-size: 12px;
    color: var(--neon-cyan);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-input {
    width: 100%;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 16px;
    outline: none;
    margin-bottom: var(--space-md);
}

.modal-input:focus {
    border-color: var(--neon-cyan);
}

.modal-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: flex-end;
}

/* HELP CONTENT */
.help-content h4 {
    font-family: var(--font-pixel);
    font-size: 10px;
    color: var(--neon-yellow);
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.help-content h4:first-child {
    margin-top: 0;
}

.help-content ol,
.help-content ul {
    padding-left: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.help-content li {
    margin-bottom: 4px;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
}

.help-content p {
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
}

.help-content code {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--neon-cyan);
    font-family: var(--font-mono);
    font-size: 13px;
}

/* RESPONSIVE */
@media (max-width: 1100px) {
    .app-main {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto 1fr;
    }
    .panel-left {
        grid-column: 1 / 2;
        max-height: 300px;
    }
    .panel-center {
        grid-column: 2 / 3;
    }
    .panel-right {
        grid-column: 1 / 3;
        max-height: 400px;
    }
}

@media (max-width: 700px) {
    .app-main {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    .panel-left,
    .panel-center,
    .panel-right {
        grid-column: 1 / 2;
        max-height: none;
    }
    .panel-left { max-height: 250px; }
    .panel-right { max-height: 400px; }
    .app-title {
        font-size: 11px;
    }
    .tab-label {
        display: none;
    }
    .tab {
        padding: var(--space-md);
    }
    .tab-icon {
        font-size: 20px;
    }
}

/* Animations */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.canvas.drag-reject {
    animation: shake 0.3s ease;
    border-color: var(--accent-danger);
}

/* ==============================
   ABOUT DRAWER (slide-in panel)
   ============================== */
.about-drawer {
    position: fixed;
    inset: 0;
    z-index: 800;
    pointer-events: none;
    visibility: hidden;
    transition: visibility 0.3s;
}

.about-drawer[aria-hidden="false"] {
    visibility: visible;
    pointer-events: auto;
}

.about-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.3s;
}

.about-drawer[aria-hidden="false"] .about-backdrop {
    opacity: 1;
}

.about-panel {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 80vh;
    background: var(--bg-secondary);
    border-top: 3px solid var(--neon-cyan);
    border-radius: 12px 12px 0 0;
    box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.6), 0 0 16px rgba(0, 217, 255, 0.3);
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.about-drawer[aria-hidden="false"] .about-panel {
    transform: translateY(0);
}

.about-header {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.about-title {
    font-family: var(--font-pixel);
    font-size: 12px;
    color: var(--neon-cyan);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-close {
    background: var(--bg-elevated);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.15s;
}

.about-close:hover {
    background: var(--accent-danger);
    border-color: var(--accent-danger);
    color: white;
}

.about-body {
    padding: var(--space-lg) var(--space-xl);
    overflow-y: auto;
    display: grid;
    grid-template-columns: 1fr 1fr 1.2fr;
    gap: var(--space-xl);
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
}

.about-section h3 {
    font-family: var(--font-pixel);
    font-size: 10px;
    color: var(--neon-cyan);
    margin-bottom: var(--space-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.about-section h3:not(:first-child) {
    margin-top: var(--space-md);
}

.about-section p {
    margin-bottom: var(--space-sm);
}

.about-section ul {
    list-style: none;
    padding: 0;
}

.about-section li {
    padding: 3px 0;
    color: var(--text-secondary);
    font-size: 12px;
}

.about-section li::before {
    content: '▸ ';
    color: var(--neon-pink);
    margin-right: 4px;
}

.about-section strong {
    color: var(--text-primary);
}

.about-section code {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 1px 5px;
    border-radius: 3px;
    color: var(--neon-cyan);
    font-family: var(--font-mono);
    font-size: 12px;
}

.about-section a {
    color: var(--neon-cyan);
    text-decoration: none;
}

.about-section a:hover {
    text-decoration: underline;
    color: var(--neon-pink);
}

.about-footer-links {
    grid-column: 1 / -1;
    border-top: 1px dashed var(--border-color);
    padding-top: var(--space-md);
    margin-top: var(--space-sm);
    text-align: center;
    color: var(--text-muted);
    font-size: 11px;
}

@media (max-width: 900px) {
    .about-body {
        grid-template-columns: 1fr;
        gap: var(--space-md);
        padding: var(--space-md);
    }
}