/* ROOT VARIABLES - SUPERLAC WHITE + PASTEL GREEN DESIGN SYSTEM */
:root {
    --bg-color: #F8FAF9;
    --sidebar-bg: #FFFFFF;
    --card-bg: rgba(111, 143, 122, 0.04);
    --border-color: rgba(111, 143, 122, 0.12);
    --accent-color: #6F8F7A;
    --accent-hover: #5A7A65;
    --accent-light: #E8F0EB;
    --secondary-accent: #38C172; /* VIBRANT INTERACTION GREEN */
    --secondary-glow: rgba(56, 193, 114, 0.25);
    --secondary-glow-strong: rgba(56, 193, 114, 0.4);
    --text-primary: #1A2B23;
    --text-secondary: #6B7F74;
    --error-color: #E05555;
    --success-color: #4A9B6E;
    --surface-elevated: #FFFFFF;
    --surface-soft: #F0F5F2;

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-pill: 999px;

    /* MOTION */
    --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
    --trans-dur: 0.3s;
    --slide-offset: 10px;
    --micro-dur: 0.2s;

    --sidebar-width: 340px;
}

/* RESET & BASE */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden; 
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height */
    width: 100vw;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: transparent;
    color: inherit;
    transition: all var(--trans-dur) var(--ease-standard);
}

button:focus-visible {
    outline: 2px solid var(--secondary-accent);
    outline-offset: 4px;
}

img {
    max-width: 100%;
    display: block;
}

/* SUBTLE BACKGROUND */
.mesh-background {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    background: var(--bg-color);
    pointer-events: none;
}

.blob {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
    filter: blur(160px);
    opacity: 0.06;
    border-radius: 50%;
}

.blob-1 { top: -10%; left: -10%; animation: blobFloat 45s infinite alternate var(--ease-standard); }
.blob-2 { bottom: -10%; right: -10%; animation: blobFloat 55s infinite alternate-reverse var(--ease-standard); opacity: 0.04; }
.blob-3 { top: 40%; left: 30%; animation: blobFloat 50s infinite alternate var(--ease-standard); opacity: 0.03; }

@keyframes blobFloat {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(150px, 100px) scale(1.2); }
}

/* MOTION GOVERNOR OVERRIDES */
body.is-system-animating * {
    pointer-events: none !important;
}
body.is-system-animating .sidebar-header, 
body.is-system-animating .control-section {
    opacity: 0.7;
    transition: opacity var(--trans-dur);
}

/* NAVIGATION - BACK HOME */
.back-home-btn {
    position: fixed;
    top: var(--space-5);
    left: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    z-index: 1000;
    transition: all var(--trans-dur) var(--ease-standard);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.back-home-btn:hover {
    background: #fff;
    transform: translateY(-2px);
    border-color: var(--accent-color);
    box-shadow: 0 8px 20px rgba(111,143,122,0.12);
}

.back-home-btn:active {
    transform: scale(0.98);
}

.back-home-btn svg {
    color: var(--text-secondary);
    transition: color var(--trans-dur);
}

.back-home-btn:hover svg {
    color: var(--accent-color);
}

/* GUIDED STEPS - WIZARD SYSTEM */
.step-section {
    transition: all 0.5s var(--ease-standard);
    opacity: 1;
    transform: scale(1);
    position: relative;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
}

.step-section.inactive {
    opacity: 0.3;
    transform: scale(0.96);
    pointer-events: none;
    filter: grayscale(1);
}

.step-section.active {
    border-color: var(--accent-color);
    background: rgba(111, 143, 122, 0.03);
    box-shadow: 0 10px 30px rgba(0,0,0,0.02);
}

.step-section.completed {
    border-color: var(--success-color);
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--accent-color);
    color: white;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    margin-right: var(--space-2);
}

.step-section.completed .step-num {
    background: var(--success-color);
}

/* SECTION TITLES */
.section-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    color: var(--text-primary);
}

/* CATEGORY SELECTOR (STEP 3) */
.category-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
}

.category-btn {
    display: flex;
    flex-direction: column;
    padding: var(--space-4);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: left;
    transition: all var(--micro-dur) var(--ease-standard);
}

.category-btn:hover {
    border-color: var(--accent-color);
    background: var(--accent-light);
}

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

.cat-label {
    font-size: 13px;
    font-weight: 600;
    display: block;
}

.cat-desc {
    font-size: 11px;
    opacity: 0.7;
    margin-top: 2px;
}

/* SECONDARY SHADE PICKER (STEP 5) */
.secondary-shade-container {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-3);
}

.secondary-status {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.secondary-preview {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--surface-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.preview-empty {
    font-size: 10px;
    color: var(--text-secondary);
}

.secondary-info {
    display: flex;
    flex-direction: column;
}

.secondary-label {
    font-size: 14px;
    font-weight: 600;
}

.secondary-hint {
    font-size: 11px;
    color: var(--text-secondary);
}

.open-secondary-btn {
    width: 100%;
    padding: var(--space-2);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    transition: all 0.3s var(--ease-standard);
}

.open-secondary-btn:hover {
    border-color: var(--secondary-accent);
    color: var(--secondary-accent);
    background: var(--accent-light);
    box-shadow: 0 4px 12px var(--secondary-glow);
}

.secondary-picker-panel {
    margin-top: var(--space-4);
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    padding: var(--space-3);
    border: 1px solid var(--border-color);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.close-panel {
    font-size: 18px;
    line-height: 1;
    color: var(--text-secondary);
}

/* LAYOUT */
.app-layout {
    display: flex;
    height: 100%;
    width: 100%;
}

/* SIDEBAR */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
    overflow-y: auto;
    z-index: 100;
    box-shadow: 4px 0 20px rgba(0,0,0,0.03);
}

/* Desktop Safe Zone for Back Button */
@media (min-width: 1024px) {
    .sidebar {
        padding-top: 80px;
    }
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.sidebar-header {
    margin-bottom: var(--space-6);
    flex-shrink: 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-1);
}

.sidebar-header h1 {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.close-sidebar-btn {
    display: none;
    color: var(--text-secondary);
}

.tagline {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
}

.divider {
    border: none;
    height: 1px;
    background-color: var(--border-color);
    margin-top: var(--space-4);
}

.control-section {
    margin-bottom: var(--space-6);
    flex-shrink: 0;
}

.section-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

/* UPLOAD CARD */
.upload-card {
    background: var(--surface-soft);
    border: 1.5px dashed var(--border-color);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    transition: transform var(--micro-dur) var(--ease-standard), 
                box-shadow var(--micro-dur) var(--ease-standard),
                border-color var(--micro-dur);
    min-height: 160px;
}

.upload-card:hover {
    border-color: var(--secondary-accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--secondary-glow);
}

.upload-card:active {
    transform: scale(0.98);
}

.upload-card.drag-active {
    border-color: var(--accent-color);
    border-style: solid;
    background: var(--accent-light);
    box-shadow: 0 0 0 4px rgba(111, 143, 122, 0.1) inset;
}

/* Error State */
.upload-card.error {
    border-color: var(--error-color);
    background: rgba(224, 85, 85, 0.05);
    box-shadow: 0 0 0 4px rgba(224, 85, 85, 0.08) inset;
}

.upload-card.shake {
    animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both;
}

@keyframes shake {
    10%, 90% { transform: translate3d(-1px, 0, 0); }
    20%, 80% { transform: translate3d(2px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-3px, 0, 0); }
    40%, 60% { transform: translate3d(3px, 0, 0); }
}

.upload-error-msg {
    color: var(--error-color);
    font-size: 13px;
    margin-top: var(--space-2);
    font-weight: 500;
    text-align: center;
}

.upload-empty, .upload-loaded {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-4);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--trans-dur) ease;
}

.upload-empty.state-active, .upload-loaded.state-active {
    opacity: 1;
    pointer-events: auto;
}

.upload-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-color);
    margin-bottom: var(--space-3);
}

.upload-title {
    font-weight: 500;
    font-size: 14px;
    margin-bottom: var(--space-1);
}

.upload-desc {
    color: var(--text-secondary);
    font-size: 12px;
}

.upload-loaded img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    z-index: 1;
    opacity: 0.8;
}

.change-btn {
    position: relative;
    z-index: 2;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-primary);
}
.change-btn:hover {
    background: #fff;
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--secondary-glow);
    border-color: var(--secondary-accent);
    color: var(--secondary-accent);
}

/* ROOM TYPE SELECTOR */
.room-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2);
}

.room-btn {
    background: var(--surface-soft);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-2);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: 13px;
    color: var(--text-secondary);
}

.room-btn:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
    color: var(--text-primary);
}

.room-btn:active {
    transform: scale(0.98);
}

.room-btn.active {
    border-color: var(--secondary-accent);
    background: var(--accent-light);
    color: var(--text-primary);
    box-shadow: 0 4px 15px var(--secondary-glow);
}

.room-btn.active svg {
    color: var(--accent-color);
}

/* OUTDOOR DIFFERENTIATION */
.room-btn[data-room="outdoor"].active {
    border-color: #4A9B6E;
    background: rgba(74, 155, 110, 0.08);
    box-shadow: 0 4px 15px rgba(74, 155, 110, 0.12);
}

.room-btn[data-room="outdoor"].active svg {
    color: #4A9B6E;
}

/* SHADE SYSTEM CONTAINER */
.shade-system-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    border: 1px solid var(--border-color);
}

/* Search Bar */
.search-wrapper {
    position: relative;
    width: 100%;
}

#shade-search {
    width: 100%;
    background: var(--surface-soft);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 13px;
    transition: all var(--trans-dur);
}

#shade-search:focus {
    outline: none;
    border-color: var(--secondary-accent);
    background: #fff;
    box-shadow: 0 0 0 4px var(--secondary-glow);
}

.secondary-search {
    margin-bottom: var(--space-4);
}

#secondary-shade-search {
    width: 100%;
    background: var(--surface-soft);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 13px;
    transition: all var(--trans-dur);
}

#secondary-shade-search:focus {
    outline: none;
    border-color: var(--secondary-accent);
    background: #fff;
    box-shadow: 0 0 0 4px var(--secondary-glow);
}

/* Scrollable Area */
.shade-list-scrollable {
    max-height: 480px;
    overflow-y: auto;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-color);
}

.shade-list-scrollable::-webkit-scrollbar {
    width: 4px;
}
.shade-list-scrollable::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-pill);
}

/* Accordion Family */
.shade-family-group {
    margin-bottom: var(--space-2);
}

.family-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 500;
    font-size: 13px;
    transition: background var(--trans-dur);
}

.family-header:hover {
    background: rgba(255, 255, 255, 0.06);
}

.family-header .chevron {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.shade-family-group.expanded .family-header {
    background: var(--accent-light);
    color: var(--accent-color);
}

.shade-family-group.expanded .chevron {
    transform: rotate(180deg);
}

.family-content {
    display: none;
    padding: var(--space-3) 0;
}

.shade-family-group.expanded .family-content,
#secondary-shade-list,
#tertiary-shade-list,
#shade-list-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    padding: var(--space-2);
    justify-items: center;
}

.shade-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* Responsive Grid Rules */
@media (max-width: 1024px) {
    .shade-family-group.expanded .family-content,
    #secondary-shade-list,
    #tertiary-shade-list,
    #shade-list-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .shade-family-group.expanded .family-content,
    #secondary-shade-list,
    #tertiary-shade-list,
    #shade-list-container {
        grid-template-columns: repeat(2, 1fr);
        justify-content: center;
    }
}

/* Swatches Refined */
.swatch, .swatch-secondary {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    position: relative;
    transition: transform 0.4s var(--ease-standard), box-shadow 0.4s ease;
    /* Soft ambient aura using the swatch color via JS variable */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1), 
                0 0 10px var(--glow-color, rgba(111,143,122,0.1));
}

.swatch:hover, .swatch-secondary:hover {
    transform: scale(1.08) translateY(-2px);
    z-index: 10;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 
                0 0 20px var(--glow-color, rgba(111,143,122,0.25));
}

.swatch.active, .swatch-secondary.active {
    transform: scale(1.12);
    border: 2px solid #fff;
    box-shadow: 0 0 0 3px var(--secondary-accent),
                0 0 25px var(--secondary-glow-strong);
    z-index: 11;
}

/* Minimal Label */
.swatch-label {
    display: block;
    font-size: 9px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 6px;
    text-align: center;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0.8;
}

/* None option for secondary */
.swatch-secondary.none {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    border: 1px dashed var(--border-color);
}

/* RIPPLE EFFECT */
.ripple-effect {
    position: absolute;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(3);
        opacity: 0;
    }
}

/* WALL COVERAGE & FINISH SELECTOR */
.wall-selector, .finish-selector {
    display: flex;
    background: var(--card-bg);
    border-radius: var(--radius-pill);
    padding: var(--space-1);
    border: 1px solid var(--border-color);
}

.wall-btn, .finish-btn {
    flex: 1;
    padding: var(--space-2);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-pill);
    color: var(--text-secondary);
}

.wall-btn:hover:not(.active), .finish-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.02);
}

.wall-btn.active, .finish-btn.active {
    background: var(--secondary-accent);
    color: #fff;
    box-shadow: 0 4px 12px var(--secondary-glow);
}

/* GENERATE BUTTON */
.sidebar-footer {
    margin-top: auto;
    padding-top: var(--space-6);
}

.generate-btn {
    width: 100%;
    height: 48px;
    background: linear-gradient(135deg, #6F8F7A, #5A7A65);
    border-radius: var(--radius-md);
    color: #fff;
    font-weight: 600;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    box-shadow: 0 4px 15px rgba(111, 143, 122, 0.25);
    position: relative;
    overflow: hidden;
}

.generate-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity var(--trans-dur);
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    filter: brightness(1.1);
    box-shadow: 0 8px 25px var(--secondary-glow-strong);
}

.generate-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.generate-btn:disabled {
    background: var(--surface-soft);
    color: var(--text-secondary);
    box-shadow: none;
    border: 1px solid var(--border-color);
    cursor: not-allowed;
    opacity: 0.6;
}

/* MAIN CONTENT AREA */
.main-content {
    flex: 1;
    position: relative;
    background: var(--bg-color);
    overflow: hidden;
}

.content-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transform: translateY(var(--slide-offset));
    transition: opacity var(--trans-dur) var(--ease-standard), 
                transform var(--trans-dur) var(--ease-standard);
    padding: var(--space-8);
}

.content-state.active {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

/* EMPTY STATE */
.empty-illustration {
    width: 120px;
    height: 120px;
    color: var(--border-color);
    margin-bottom: var(--space-6);
}

.state-empty h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.state-empty p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 400px;
    text-align: center;
    line-height: 1.5;
}

/* LOADING STATE */
.loading-wrapper {
    position: relative;
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    padding: 3rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    position: relative;
    z-index: 2;
    width: 100%;
    border: 1px solid var(--border-color);
}

/* SVG PROGRESS BORDER */
.loading-border-svg {
    position: absolute;
    top: -3px;
    left: -3px;
    width: calc(100% + 6px);
    height: calc(100% + 6px);
    z-index: 1;
    pointer-events: none;
    overflow: visible;
}

.loading-border-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 2px;
}

.loading-border-progress {
    fill: none;
    stroke: var(--secondary-accent);
    stroke-width: 4px;
    stroke-linecap: round;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset 0.2s linear;
    filter: drop-shadow(0 0 8px var(--secondary-glow-strong));
}

.progress-indicator {
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
}

.loading-percent-text {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--secondary-accent);
}

.scanner-container {
    position: relative;
    width: 200px;
    height: 120px;
    background: var(--surface-soft);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.scanner-beam {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent, var(--secondary-accent), transparent);
    height: 40px;
    width: 100%;
    z-index: 10;
    animation: scan 2s linear infinite;
    filter: blur(6px);
    opacity: 0.6;
}

@keyframes scan {
    0% { transform: translateY(-100%); }
    100% { transform: translateY(300%); }
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.state-loading h2 {
    font-size: 20px;
    margin-bottom: var(--space-3);
    font-weight: 500;
}

.dots {
    animation: dots 1.5s infinite steps(4, end);
    display: inline-block;
    width: 24px;
    text-align: left;
}

@keyframes dots {
    0%, 20% { opacity: 0; content: ''; }
    40% { opacity: 1; content: '.'; }
    60% { opacity: 1; content: '..'; }
    80%, 100% { opacity: 1; content: '...'; }
}

.loading-tip {
    color: var(--text-secondary);
    font-size: 14px;
    opacity: 0;
    animation: fadeInOut 4s infinite 1s;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0; transform: translateY(5px); }
    10%, 90% { opacity: 1; transform: translateY(0); }
}

/* RESULT STATE */
.single-output-container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-6);
    z-index: 5;
}

.result-header {
    text-align: center;
    margin-bottom: var(--space-4);
}

.result-header h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--text-primary);
}

.result-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.preview-frame {
    width: 100%;
    height: var(--preview-height, 60vh);
    transition: height 0.3s ease;
    background: var(--surface-soft);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    cursor: ew-resize;
    user-select: none;
    --slider-pos: 50%;
}

.preview-frame .single-output-container {
    max-width: 100%;
    gap: var(--space-4);
}

.slider-layer {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.after-layer {
    z-index: 2;
    clip-path: inset(0 0 0 var(--slider-pos));
}

.before-layer {
    z-index: 1;
}

.comparison-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

.result-img {
    opacity: 0; /* Managed by JS/Animation */
}

/* SLIDER UI */
.slider-divider {
    position: absolute;
    inset: 0;
    left: var(--slider-pos);
    width: 0;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

.slider-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
    transform: translateX(-50%);
}

.slider-handle {
    position: absolute;
    top: 50%;
    left: 0;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translate(-50%, -50%);
    color: #fff;
    box-shadow: 0 0 20px rgba(0,0,0,0.5), inset 0 0 10px rgba(255,255,255,0.2);
    cursor: grab;
    pointer-events: auto;
    transition: transform 0.2s, background 0.2s;
}

.slider-handle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translate(-50%, -50%) scale(1.1);
}

.slider-handle:active {
    cursor: grabbing;
    background: rgba(255, 255, 255, 0.3);
}

/* LABELS */
.comparison-label {
    position: absolute;
    top: var(--space-4);
    padding: var(--space-2) var(--space-4);
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: #fff;
    border: 1px solid rgba(255,255,255,0.1);
    z-index: 5;
    pointer-events: none;
}

.label-before { left: var(--space-4); }
.label-after { right: var(--space-4); }

/* REVEAL FOCUS ANIMATION */
.reveal-focus {
    animation: revealFocus 0.6s var(--ease-standard) forwards;
}

@keyframes revealFocus {
    0% { 
        filter: blur(8px) brightness(0.8); 
        opacity: 0;
        transform: scale(1.05);
    }
    100% { 
        filter: blur(0) brightness(1); 
        opacity: 1;
        transform: scale(1);
    }
}

/* METADATA CHIPS */
.metadata-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
}

.meta-chip {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--surface-soft);
    border: 1px solid var(--border-color);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    font-size: 13px;
    color: var(--text-primary);
}

.meta-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.color-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    box-shadow: 0 0 5px rgba(255,255,255,0.2);
}

/* FLOATING ACTION BAR */
.fab {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    padding: var(--space-2);
    border-radius: var(--radius-pill);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.state-result.active .fab {
    transform: translateX(-50%) translateY(0);
}

.fab-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    border-radius: var(--radius-pill);
}

.fab-btn:hover {
    background: var(--accent-light);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--secondary-glow);
}

.fab-btn svg {
    color: var(--text-secondary);
    transition: color 0.2s;
}

.fab-btn:hover svg {
    color: var(--secondary-accent);
}

.fab-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
}

/* MOBILE CONTROLS */
.mobile-drawer-btn {
    display: none;
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-color);
    color: #fff;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 15px;
    gap: var(--space-2);
    align-items: center;
    box-shadow: 0 8px 24px rgba(111, 143, 122, 0.35);
    z-index: 50;
}

.drawer-backdrop {
    pointer-events: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.3);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    transition: opacity var(--trans-dur);
}
body.drawer-open .drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
}

/* MOBILE RESPONSIVE SYSTEM (PRODUCTION SAFE) */
@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
    }

    /* BOTTOM SHEET (SIDEBAR) */
    .sidebar {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 75dvh;
        max-height: 75dvh;
        transform: translateY(100%);
        transition: transform 0.4s var(--ease-standard);
        border-right: none;
        border-top: 1px solid var(--border-color);
        box-shadow: 0 -10px 30px rgba(0,0,0,0.08);
        border-top-left-radius: var(--radius-lg);
        border-top-right-radius: var(--radius-lg);
        padding: 0 var(--space-6) env(safe-area-inset-bottom);
        padding-top: var(--space-4);
        background-color: var(--sidebar-bg);
        z-index: 1000;
    }

    body.drawer-open .sidebar {
        transform: translateY(0);
    }

    /* DRAWER HANDLE */
    .drawer-handle {
        display: block;
        width: 40px;
        height: 4px;
        background: var(--border-color);
        border-radius: var(--radius-pill);
        margin: 0 auto var(--space-4);
        flex-shrink: 0;
    }

    .close-sidebar-btn {
        display: block;
    }

    .mobile-drawer-btn {
        display: flex;
        left: auto;
        right: var(--space-6);
        transform: none;
        bottom: calc(var(--space-6) + env(safe-area-inset-bottom));
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    }

    .sidebar-header {
        position: sticky;
        top: 0;
        background: var(--sidebar-bg);
        z-index: 10;
        padding-top: var(--space-2);
        margin-bottom: var(--space-4);
    }

    /* ROOM SELECTOR: HORIZONTAL SCROLL */
    .room-selector-wrapper {
        position: relative;
        margin: 0 calc(var(--space-6) * -1);
        padding: 0 var(--space-6);
    }

    /* Gradient hints for scroll */
    .room-selector-wrapper::before,
    .room-selector-wrapper::after {
        content: '';
        position: absolute;
        top: 0;
        bottom: 0;
        width: 40px;
        z-index: 2;
        pointer-events: none;
    }
    .room-selector-wrapper::before {
        left: 0;
        background: linear-gradient(to right, var(--sidebar-bg), transparent);
    }
    .room-selector-wrapper::after {
        right: 0;
        background: linear-gradient(to left, var(--sidebar-bg), transparent);
    }

    .room-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        gap: var(--space-3);
        padding-bottom: var(--space-2);
        -webkit-overflow-scrolling: touch;
    }

    .room-grid::-webkit-scrollbar {
        display: none;
    }

    .room-btn {
        flex: 0 0 120px;
        scroll-snap-align: center;
        height: 48px; /* Touch target */
        flex-direction: row;
        padding: 0 var(--space-3);
    }

    /* SHADE PICKER ADAPTATION */
    .shade-list-scrollable {
        max-height: 35dvh;
    }

    /* STICKY CTA */
    .sidebar-footer {
        position: sticky;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--sidebar-bg);
        padding: var(--space-4) 0 calc(var(--space-4) + env(safe-area-inset-bottom));
        border-top: 1px solid var(--border-color);
        z-index: 20;
    }

    .generate-btn {
        height: 52px; /* Enhanced touch target */
        box-shadow: 0 -10px 20px rgba(0,0,0,0.2);
    }

    /* MAIN CONTENT */
    .main-content {
        height: 40dvh;
        padding-bottom: 0;
    }

    .collage-grid {
        display: none;
    }

    .single-output-container {
        max-width: 100%;
        gap: var(--space-4);
    }

    .preview-frame {
        aspect-ratio: 16 / 9;
    }

    .metadata-row {
        gap: var(--space-2);
    }

    .meta-chip {
        padding: var(--space-1) var(--space-3);
        font-size: 12px;
    }

    /* MOBILE MOTION MODE */
    .blob {
        animation: none !important;
        opacity: 0.04;
    }
    
    /* Reduced scanner intensity */
    .scanner-beam {
        animation-duration: 4s;
        opacity: 0.2;
    }

    /* Faster transitions (30% increase) */
    :root {
        --trans-dur: 0.2s;
        --micro-dur: 0.14s;
    }

    .upload-card:hover, .room-btn:hover, .fab-btn:hover {
        transform: none !important;
    }
}

/* SHADE APPLIED TOAST */
.shade-toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--surface-elevated);
    border: 1px solid var(--border-color);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    z-index: 2000;
    opacity: 0;
    transition: all 0.3s var(--ease-standard);
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.shade-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* INLINE ERROR STATE */
.state-error {
    text-align: center;
}

.state-error .error-icon {
    width: 64px;
    height: 64px;
    color: var(--error-color);
    margin-bottom: var(--space-4);
    opacity: 0.7;
}

.state-error h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.state-error p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    max-width: 400px;
}

.retry-btn {
    background: var(--accent-color);
    color: #fff;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-pill);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    box-shadow: 0 4px 12px rgba(111,143,122,0.2);
    transition: all var(--trans-dur) var(--ease-standard);
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(111,143,122,0.3);
}

/* FOCUS-VISIBLE ACCESSIBILITY */
*:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.swatch:focus-visible {
    outline-offset: 3px;
    border-radius: 50%;
}

.generate-btn:focus-visible,
.fab-btn:focus-visible {
    outline-offset: 3px;
}

/* EXPORT OPTIONS & STYLE SELECTOR */
.export-options {
    margin-top: var(--space-6);
    padding: var(--space-5);
    background: rgba(111, 143, 122, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.options-title {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    font-weight: 700;
    margin-bottom: var(--space-4);
    text-align: center;
}

.style-selector {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
}

.style-btn {
    flex: 1;
    padding: var(--space-3) var(--space-2);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--trans-dur) var(--ease-standard);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
}

.style-btn:hover {
    border-color: var(--accent-color);
    background: var(--accent-light);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.style-btn.active {
    background: linear-gradient(135deg, var(--secondary-accent), #2F9E5F);
    color: white;
    border-color: transparent;
    box-shadow: 0 8px 20px var(--secondary-glow-strong);
}

.style-btn i {
    font-size: 18px;
    margin-bottom: var(--space-1);
}

/* EXPORT OVERLAY */
.export-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s var(--ease-standard);
}

.export-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.export-loader-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(32px) saturate(200%);
    -webkit-backdrop-filter: blur(32px) saturate(200%);
    padding: var(--space-8);
    border-radius: 40px;
    width: 100%;
    max-width: 440px;
    text-align: center;
    position: relative;
    overflow: visible;
    border: 1px solid rgba(255, 255, 255, 0.8);
    transform: translateY(30px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 
        0 30px 60px -12px rgba(111, 143, 122, 0.2),
        inset 0 0 0 1px rgba(255, 255, 255, 0.5);
    background-image: 
        radial-gradient(at 0% 0%, rgba(255, 255, 255, 0.4) 0, transparent 50%),
        radial-gradient(at 100% 100%, rgba(111, 143, 122, 0.05) 0, transparent 50%);
}

.export-mascot-wrapper {
    position: absolute;
    top: -55px;
    right: -25px;
    width: 120px;
    height: 120px;
    z-index: 10;
    filter: drop-shadow(0 15px 30px rgba(0,0,0,0.2));
    animation: mascotFloat 4s ease-in-out infinite;
    pointer-events: none;
}

@keyframes mascotFloat {
    0%, 100% { transform: translateY(0) rotate(3deg); }
    50% { transform: translateY(-12px) rotate(-3deg); }
}

.export-mascot {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.export-overlay.active .export-loader-card {
    transform: translateY(0);
}

.loader-spinner {
    width: 54px;
    height: 54px;
    border: 3.5px solid rgba(111, 143, 122, 0.1);
    border-top: 3.5px solid var(--accent-color);
    border-radius: 50%;
    margin: 0 auto var(--space-6);
    animation: spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    filter: drop-shadow(0 0 8px rgba(111, 143, 122, 0.3));
}

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

.export-loader-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.export-loader-card p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.5;
}

.export-progress {
    height: 8px;
    background: rgba(111, 143, 122, 0.1);
    border-radius: var(--radius-pill);
    overflow: hidden;
    position: relative;
    margin-bottom: var(--space-2);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
}

.export-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #8EB19A);
    width: 0%;
    transition: width 0.1s linear;
    border-radius: var(--radius-pill);
}

.export-footer-text {
    margin-top: var(--space-8);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    opacity: 0.6;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* FAB Adjustments */
.fab {
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}

/* SECONDARY ACCENT - INTERACTION SYSTEM COVERAGE */
.retry-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--secondary-accent);
  color: white;
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: all 0.3s var(--ease-standard);
  box-shadow: 0 4px 12px var(--secondary-glow);
  border: none;
  cursor: pointer;
}

.retry-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--secondary-glow-strong);
  filter: brightness(1.1);
}

.retry-btn svg {
  transition: transform 0.3s ease;
}

.retry-btn:hover svg {
  transform: rotate(180deg);
}

/* TERTIARY (THIRD) ACCENT PICKER (STEP 6) */
.tertiary-shade-container {
  background: white;
  border: 1px solid #E8D5B5;
  border-radius: var(--radius-md);
  padding: var(--space-3);
  border-left: 3px solid #D4A853;
}

.tertiary-status {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.tertiary-preview {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #E8D5B5;
}

.tertiary-info {
  display: flex;
  flex-direction: column;
}

.tertiary-label {
  font-size: 14px;
  font-weight: 600;
}

.tertiary-hint {
  font-size: 11px;
  color: var(--text-secondary);
}

.open-tertiary-btn {
  width: 100%;
  padding: var(--space-2);
  border: 1px solid #D4A853;
  color: #B8943E;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 600;
  transition: all 0.3s var(--ease-standard);
}

.open-tertiary-btn:hover {
  border-color: #C49A3C;
  color: #A07D2E;
  background: #FFF8EC;
  box-shadow: 0 4px 12px rgba(212, 168, 83, 0.25);
}

.tertiary-picker-panel {
  margin-top: var(--space-4);
  background: var(--bg-color);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  border: 1px solid #E8D5B5;
}

.tertiary-search {
  margin-bottom: var(--space-4);
}

#tertiary-shade-search {
  width: 100%;
  background: var(--surface-soft);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 10px 16px;
  color: var(--text-primary);
  font-size: 13px;
  transition: all var(--trans-dur);
}

#tertiary-shade-search:focus {
  outline: none;
  border-color: #D4A853;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(212, 168, 83, 0.15);
}

/* Swatch Tertiary */
.swatch-tertiary {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  cursor: pointer;
  position: relative;
  transition: transform 0.4s var(--ease-standard), box-shadow 0.4s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1), 
              0 0 10px var(--glow-color, rgba(111,143,122,0.1));
}

.swatch-tertiary:hover {
  transform: scale(1.08) translateY(-2px);
  z-index: 10;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 
              0 0 20px var(--glow-color, rgba(111,143,122,0.25));
}

.swatch-tertiary.active {
  transform: scale(1.12);
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px #D4A853,
              0 0 25px rgba(212, 168, 83, 0.4);
  z-index: 11;
}

/* None option for tertiary */
.swatch-tertiary.none {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px dashed var(--border-color);
}

/* ──────────────────────────────────────────────
   LOADING SKELETON — Shimmer placeholders that
   mirror the result layout for perceived speed
   ────────────────────────────────────────────── */
.skeleton-result {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  padding: var(--space-8);
  opacity: 0.5;
  z-index: 0;
}

.skeleton-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.skeleton-line {
  height: 14px;
  border-radius: var(--radius-pill);
  background: var(--border-color);
  position: relative;
  overflow: hidden;
}

.skeleton-line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    transparent
  );
  animation: skeleton-shimmer 1.8s ease-in-out infinite;
}

.skeleton-line-short {
  width: 180px;
}

.skeleton-line-medium {
  width: 260px;
}

.skeleton-preview-frame {
  width: 100%;
  max-width: 700px;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  background: var(--border-color);
  position: relative;
  overflow: hidden;
}

.skeleton-preview-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: skeleton-shimmer 1.8s ease-in-out infinite;
}

.skeleton-img {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--border-color) 0%, var(--surface-soft) 100%);
}

.skeleton-badge {
  position: absolute;
  top: var(--space-4);
  width: 64px;
  height: 20px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.3);
}

.skeleton-badge-left {
  left: var(--space-4);
}

.skeleton-badge-right {
  right: var(--space-4);
}

.skeleton-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.skeleton-metadata {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
}

.skeleton-chip {
  width: 130px;
  height: 32px;
  border-radius: var(--radius-pill);
  background: var(--border-color);
  position: relative;
  overflow: hidden;
}

.skeleton-chip::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    transparent
  );
  animation: skeleton-shimmer 1.8s ease-in-out infinite;
}

.skeleton-chip-short {
  width: 100px;
}

.skeleton-fab {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 44px;
  padding: var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--border-color);
  position: relative;
  overflow: hidden;
}

.skeleton-fab::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: skeleton-shimmer 1.8s ease-in-out infinite;
}

.skeleton-fab-btn {
  width: 80px;
  height: 32px;
  border-radius: var(--radius-pill);
}

.skeleton-fab-btn-short {
  width: 100px;
}

.skeleton-fab-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.2);
}

@keyframes skeleton-shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* On mobile, show skeleton behind loading card */
@media (max-width: 768px) {
  .skeleton-result {
    padding: var(--space-4);
    gap: var(--space-3);
    opacity: 0.3;
  }

  .skeleton-preview-frame {
    max-width: 100%;
  }

  .skeleton-chip {
    width: 90px;
    height: 28px;
  }

  .skeleton-chip-short {
    width: 80px;
  }

  .skeleton-fab-btn {
    width: 60px;
    height: 28px;
  }

  .skeleton-fab-btn-short {
    width: 80px;
  }
}

/* Tertiary grid: reuse secondary shade list grid */
#tertiary-shade-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  padding: var(--space-2);
  justify-items: center;
}

@media (max-width: 480px) {
  #tertiary-shade-list {
    grid-template-columns: repeat(2, 1fr);
    justify-content: center;
  }
}

/* ──────────────────────────────────────────────
   CONDITIONAL VISIBILITY: show step-6 only for outdoor/exterior
   ────────────────────────────────────────────── */
.step-section[data-step="6"] {
  display: none;
}
body.show-tertiary-step .step-section[data-step="6"] {
  display: block;
}

/* Global Focus Ring for Accessibility */
:focus-visible {
    outline: 2px solid var(--secondary-accent) !important;
    outline-offset: 3px !important;
}

/* Input Focus States */
input:focus, select:focus, textarea:focus {
    border-color: var(--secondary-accent) !important;
    box-shadow: 0 0 0 4px var(--secondary-glow) !important;
}

/* Scrollbar Highlights */
.sidebar::-webkit-scrollbar-thumb:hover,
.shade-list-scrollable::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-accent);
}

/* ──────────────────────────────────────────────
   MISSING UI CLASSES (visualizer.js integration)
   ────────────────────────────────────────────── */

/* Toast Notifications */
.system-toast,
.shade-toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    color: #fff;
    padding: 12px 24px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    z-index: 99999;
    pointer-events: none;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    white-space: nowrap;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.system-toast.visible,
.shade-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.shade-toast {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Mobile Drawer */
.drawer-open {
    overflow: hidden;
}

.drawer-open .sidebar {
    transform: translateX(0) !important;
}

.drawer-open .drawer-backdrop {
    opacity: 1;
    pointer-events: auto;
}

/* Selection Buttons */
.room-btn,
.wall-btn,
.finish-btn,
.category-btn {
    cursor: pointer;
    transition: all 0.3s ease;
}

/* Primary Shade Item */
.shade-item {
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.shade-item:hover {
    transform: translateY(-2px);
}

/* Secondary Swatch */
.swatch-secondary {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.swatch-secondary:hover {
    transform: scale(1.1);
}

.swatch-secondary.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--accent-color);
}