/* ==========================================================================
   GearGen-3D Main Stylesheet
   Industrial CAD Dark Interface
   ========================================================================== */

/* Custom Fonts */
@font-face {
    font-family: 'LogoFont';
    src: url('../../assets/fonts/Logo_font.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'SloganFont';
    src: url('../../assets/fonts/slogan_font.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--background-primary);
    color: var(--text-primary);
    font-family: var(--font-ui);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* ==========================================================================
   Top Bar (Header - Height: 56px)
   ========================================================================== */
.top-bar {
    height: var(--header-height);
    min-height: var(--header-height);
    background-color: var(--background-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 500;
    position: relative;
    user-select: none;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.branding {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.logo-img {
    height: 32px;
    width: auto;
    display: block;
}

.branding-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.branding-title {
    font-family: 'LogoFont', var(--font-ui);
    font-size: 1.15rem;
    font-weight: 400;
    letter-spacing: -0.3px;
    color: var(--text-primary);
    line-height: 1.1;
}

.branding-tagline {
    font-family: 'SloganFont', var(--font-ui);
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--text-secondary);
    line-height: 1.1;
    white-space: nowrap;
}

/* Top Menu Bar */
.menu-bar {
    display: flex;
    align-items: center;
    gap: 2px;
}

.menu-group {
    position: relative;
}

.menu-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 10px;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.menu-btn:hover,
.menu-btn[aria-expanded="true"] {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--background-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 220px;
    padding: 6px;
    z-index: 1000;
}

.menu-dropdown.open {
    display: block;
    animation: fadeInMenu 0.12s ease-out;
}

@keyframes fadeInMenu {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.menu-item {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 7px 12px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.825rem;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.menu-item:hover:not(:disabled) {
    background: var(--accent-primary);
    color: #ffffff;
}

.menu-item:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.menu-shortcut {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
}

.menu-item:hover:not(:disabled) .menu-shortcut {
    color: rgba(255, 255, 255, 0.8);
}

.menu-separator {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

/* Quick Actions */
.top-bar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.quick-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.825rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.quick-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--border-focus);
}

/* ==========================================================================
   Three-Panel Workspace Layout
   ========================================================================== */
.workspace-layout {
    display: grid;
    grid-template-columns: var(--left-sidebar-width) 1fr var(--right-sidebar-width);
    gap: 12px;
    height: calc(100vh - var(--header-height));
    padding: 12px;
    background-color: var(--background-primary);
    overflow: hidden;
}

/* Panels Common */
.workspace-panel {
    background: var(--background-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-md);
}

.panel-header {
    height: 48px;
    min-height: 48px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: rgba(0, 0, 0, 0.15);
    user-select: none;
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-title-icon {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

.panel-scrollable {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

/* Custom Scrollbar */
.panel-scrollable::-webkit-scrollbar {
    width: 6px;
}

.panel-scrollable::-webkit-scrollbar-track {
    background: transparent;
}

.panel-scrollable::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
}

.panel-scrollable::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==========================================================================
   Left Sidebar: Gear Selector (280px)
   ========================================================================== */
.gear-types-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.gear-type-card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 6px;
    user-select: none;
}

.gear-type-card:hover {
    background: var(--background-panel-hover);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.gear-type-card.active {
    background: rgba(59, 130, 246, 0.12);
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 1px var(--accent-primary), 0 4px 12px var(--accent-primary-glow);
}

.gear-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.gear-card-icon-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.gear-icon-wrapper {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.gear-icon-img {
    width: 20px;
    height: 20px;
    object-fit: contain;
    filter: brightness(0.9) contrast(1.1);
}

.gear-card-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.gear-type-card.active .gear-card-title {
    color: #60A5FA;
}

.gear-card-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.35;
    padding-left: 2px;
}

/* ==========================================================================
   Center Viewport: Three.js WebGL Canvas
   ========================================================================== */
.viewport-panel {
    background: var(--background-primary);
    position: relative;
    overflow: hidden;
}

#preview-canvas {
    width: 100%;
    height: 100%;
    outline: none;
    cursor: grab;
}

#preview-canvas:active {
    cursor: grabbing;
}

/* Floating Toolbar (All 10 Controls) */
.floating-toolbar {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    z-index: 20;
    user-select: none;
}

.floating-btn {
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    position: relative;
}

.floating-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
}

.floating-btn.active {
    background: var(--accent-primary);
    color: #ffffff;
}

.toolbar-separator {
    width: 1px;
    height: 18px;
    background: var(--border);
    margin: 0 2px;
}

/* Mesh Statistics Overlay (Bottom-Left) */
.mesh-statistics-overlay {
    position: absolute;
    bottom: 14px;
    left: 14px;
    background: rgba(30, 41, 59, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 8px 14px;
    box-shadow: var(--shadow-md);
    z-index: 20;
    display: flex;
    gap: 16px;
    user-select: none;
}

.stat-metric {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.68rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Mobile Bottom Navigation & Drawers
   ========================================================================== */
.mobile-nav {
    display: none;
}

.mobile-overlay {
    display: none;
}

.mobile-drawer-header {
    display: none;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background: var(--background-panel);
    border: 1px solid var(--accent-success);
    color: var(--text-primary);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    animation: toastSlideIn 0.25s ease-out;
    pointer-events: auto;
}

.toast i {
    color: var(--accent-success);
    font-size: 1rem;
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Validation feedback */
.validation-feedback { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.validation-badge { padding: 6px 10px; border-radius: 6px; font-size: 0.85rem; }
.validation-badge.error { background: rgba(239,68,68,0.15); color: #FCA5A5; border: 1px solid #EF4444; }
.validation-badge.warning { background: rgba(245,158,11,0.15); color: #FCD34D; border: 1px solid #F59E0B; }
.validation-badge.info { background: rgba(16,185,129,0.15); color: #6EE7B7; border: 1px solid #10B981; }

/* Welcome Modal */
.welcome-modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.7); display: flex; align-items: center; justify-content: center; z-index: 2000; }
.welcome-modal { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 24px; max-width: 720px; width: 90%; }
.welcome-modal h2 { margin-bottom: 16px; }
.welcome-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.welcome-card { background: var(--secondary); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 16px; color: var(--text-primary); cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.welcome-card:hover { border-color: var(--primary); }
.welcome-actions { display: flex; justify-content: space-between; align-items: center; }
.welcome-hide { font-size: 0.85rem; color: var(--text-secondary); }