/* ==========================================
   DESIGN TOKENS & CSS VARIABLES
   ========================================== */
:root {
    /* Color Palette - Premium Dark Theme */
    --color-bg-primary: #0a0b0f;
    --color-bg-secondary: #12141a;
    --color-bg-tertiary: #1a1d26;
    --color-bg-elevated: #1f2330;

    /* Accent Colors */
    --color-accent-primary: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --color-accent-glow: rgba(99, 102, 241, 0.3);

    /* Text Colors */
    --color-text-primary: #f1f3f9;
    --color-text-secondary: #9ca3b8;
    --color-text-muted: #6b7280;

    /* Border & Divider */
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Status Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--color-accent-glow);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Layout */
    --navbar-height: 70px;
    --sidebar-width: 320px;
}

/* ==========================================
   GLOBAL STYLES & RESET
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
    width: 100%;
}

.hidden {
    display: none !important;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    position: relative;
}

/* Animated Background Gradient */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.05) 0%, transparent 70%);
    animation: pulse 10s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1) rotate(0deg);
    }

    50% {
        transform: scale(1.1) rotate(180deg);
    }
}

/* ==========================================
   NAVIGATION BAR
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: transform var(--transition-normal);
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--color-accent-primary);
    filter: drop-shadow(0 0 8px var(--color-accent-glow));
    transition: all var(--transition-normal);
}

.logo:hover .logo-icon {
    color: var(--color-accent-secondary);
    transform: rotate(5deg);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==========================================
   MAIN CONTAINER LAYOUT
   ========================================== */
.main-container {
    margin-top: var(--navbar-height);
    display: flex;
    height: calc(100vh - var(--navbar-height));
    width: 100%;
    max-width: 100vw;
    position: relative;
    z-index: 1;
    overflow-x: hidden;
}

/* ==========================================
   SIDEBAR
   ========================================== */
.sidebar {
    min-width: 280px;
    width: var(--sidebar-width);
    max-width: 400px;
    flex-shrink: 0;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent-primary) var(--color-bg-tertiary);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-accent-primary);
    border-radius: 3px;
}

.sidebar-content {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.sidebar-section {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.sidebar-section:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--color-accent-gradient);
    border-radius: 2px;
}

/* ==========================================
   FORM INPUTS
   ========================================== */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.label-with-info {
    display: flex !important;
    align-items: center;
    gap: var(--spacing-xs);
}

.input-field {
    width: 100%;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: 0.938rem;
    transition: all var(--transition-normal);
}

.input-field:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

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

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.938rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-icon {
    width: 20px;
    height: 20px;
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: var(--color-accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
    margin-bottom: var(--spacing-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--color-accent-glow);
}

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

.btn-secondary {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.btn-secondary:last-child {
    margin-bottom: 0;
}

.btn-secondary:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-tertiary);
}

/* ==========================================
   PROGRESS SECTION
   ========================================== */
.progress-container {
    margin-bottom: var(--spacing-lg);
}

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

.progress-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.progress-percentage {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    font-weight: 700;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--color-bg-elevated);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--color-accent-gradient);
    border-radius: 4px;
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

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

    100% {
        transform: translateX(100%);
    }
}

/* ==========================================
   TODO LIST
   ========================================== */
.todo-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.todo-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-bg-elevated);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.todo-item:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-secondary);
}

.todo-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.todo-item[data-status="completed"] .todo-checkbox {
    background: var(--color-accent-gradient);
    border-color: var(--color-accent-primary);
}

.todo-item[data-status="completed"] .todo-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.todo-text {
    font-size: 0.875rem;
    color: var(--color-text-primary);
    transition: all var(--transition-normal);
}

.todo-item[data-status="completed"] .todo-text {
    color: var(--color-text-muted);
    text-decoration: line-through;
}

/* ==========================================
   CUSTOM CHECKBOXES
   ========================================== */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.checkbox-item:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-secondary);
}

.checkbox-item input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.checkbox-item input[type="checkbox"]:checked+.checkbox-custom {
    background: var(--color-accent-gradient);
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 8px var(--color-accent-glow);
}

.checkbox-item input[type="checkbox"]:checked+.checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.checkbox-label {
    font-size: 0.813rem;
    color: var(--color-text-primary);
    user-select: none;
}

/* ==========================================
   ROOM SELECTOR
   ========================================== */
.room-selector {
    display: flex;
    flex-direction: column;
    /* Vertical stacking by default in sidebar */
    gap: var(--spacing-lg);
}

.available-rooms,
.selected-rooms {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.room-list-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.room-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-height: auto;
}

/* Allow available rooms to wrap horizontally */
.available-rooms .room-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

/* Room list scrollbar styles removed as no longer needed */

.room-chip {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    /* More chip-like */
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.room-chip:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-tertiary);
    transform: translateX(2px);
}

.room-icon {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.room-chip span {
    font-size: 0.813rem;
    color: var(--color-text-primary);
}

.room-chip.hidden {
    display: none;
}

/* Selected Room Item */
.selected-room-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    /* Allow wrapping on very small widths */
}

.selected-room-item:hover {
    border-color: var(--color-border-hover);
}

.selected-room-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.selected-room-name {
    font-size: 0.813rem;
    color: var(--color-text-primary);
    font-weight: 500;
}

.quantity-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.quantity-btn {
    width: 24px;
    height: 24px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-primary);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    padding: 0;
}

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

.quantity-btn:active {
    transform: scale(0.9);
}

.quantity-display {
    min-width: 24px;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--color-text-muted);
    font-size: 0.813rem;
}

.empty-state.hidden {
    display: none;
}


/* ==========================================
   CUSTOM RADIO BUTTONS
   ========================================== */
.radio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.radio-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
}

.radio-item:hover {
    border-color: var(--color-border-hover);
    background: var(--color-bg-secondary);
}

.radio-item input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-custom {
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.radio-item input[type="radio"]:checked+.radio-custom {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 8px var(--color-accent-glow);
}

.radio-item input[type="radio"]:checked+.radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    background: var(--color-accent-gradient);
    border-radius: 50%;
}

.radio-label {
    font-size: 0.875rem;
    color: var(--color-text-primary);
    user-select: none;
}

/* ==========================================
   INFO BUTTON WITH TOOLTIP
   ========================================== */
.info-btn {
    background: none;
    border: none;
    padding: 0;
    width: 16px;
    height: 16px;
    color: var(--color-text-muted);
    cursor: help;
    position: relative;
    transition: all var(--transition-normal);
}

.info-btn svg {
    width: 100%;
    height: 100%;
}

.info-btn:hover {
    color: var(--color-accent-primary);
}

.info-btn::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    white-space: normal;
    width: 200px;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.info-btn:hover::after {
    opacity: 1;
}

/* ==========================================
   FLOOR SELECTION (NEW)
   ========================================== */
.floor-selector {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.floor-chip {
    flex: 1;
    min-width: 40px;
    height: 40px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.938rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.floor-chip:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.floor-chip.active {
    background: var(--color-accent-gradient);
    border-color: var(--color-accent-primary);
    color: white;
    box-shadow: var(--shadow-glow);
}

/* ==========================================
   QUALITY TIER SELECTION
   ========================================== */
.quality-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.quality-option {
    cursor: pointer;
    position: relative;
}

.quality-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.quality-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.quality-option:hover .quality-card {
    border-color: var(--color-border-hover);
    background: var(--color-bg-secondary);
}

.quality-option input[type="radio"]:checked+.quality-card {
    border-color: var(--color-accent-primary);
    background: var(--color-bg-secondary);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.quality-name {
    font-size: 0.938rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.quality-price {
    font-size: 0.813rem;
    color: var(--color-accent-primary);
    font-weight: 700;
}

.quality-option input[type="radio"]:checked+.quality-card .quality-price {
    color: var(--color-accent-secondary);
}

/* ==========================================
   CANVAS AREA
   ========================================== */
.canvas-area {
    flex: 1;
    min-width: 0;
    background: var(--color-bg-primary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.canvas-header {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.canvas-header-top {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.canvas-floor-tabs {
    display: flex;
    padding: 0 var(--spacing-xl);
    gap: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-top: 1px solid var(--color-border);
    overflow-x: auto;
    scrollbar-width: none;
}

.canvas-floor-tabs::-webkit-scrollbar {
    display: none;
}

.floor-tab {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-normal);
}

.floor-tab:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.floor-tab.active {
    color: var(--color-accent-primary);
    border-bottom-color: var(--color-accent-primary);
    background: rgba(99, 102, 241, 0.05);
}

.canvas-floor-tabs.hidden {
    display: none;
}

.canvas-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.canvas-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.control-btn {
    width: 40px;
    height: 40px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.control-btn:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
    transform: translateY(-2px);
}

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

.canvas-wrapper {
    flex: 1;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: radial-gradient(circle at 2px 2px, var(--color-border) 1px, transparent 0);
    background-size: 32px 32px;
}

.validation-error-container {
    position: absolute;
    top: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    background: rgba(239, 68, 68, 0.9);
    border: 1px solid #ef4444;
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
    max-width: 90%;
    backdrop-filter: blur(8px);
    transition: all var(--transition-normal);
}

.validation-error-container.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -20px);
}

.validation-error-item {
    margin-bottom: var(--spacing-xs);
}

.validation-error-item:last-child {
    margin-bottom: 0;
}

#floor-plan-canvas {
    max-width: 100%;
    max-height: 100%;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    box-shadow: var(--shadow-lg);
    display: none;
}

.canvas-placeholder {
    text-align: center;
    max-width: 400px;
}

.placeholder-icon {
    width: 100px;
    height: 100px;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
    animation: float 3s ease-in-out infinite;
}

.error-shake {
    animation: shake 0.5s 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(-4px, 0, 0);
    }

    40%,
    60% {
        transform: translate3d(4px, 0, 0);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.placeholder-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.placeholder-subtext {
    font-size: 0.938rem;
    color: var(--color-text-muted);
}

.canvas-info {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-2xl);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.info-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.info-value {
    font-size: 0.938rem;
    color: var(--color-accent-primary);
    font-weight: 700;
}

/* ==========================================
   RESPONSIVE DESIGN - TABLET
   ========================================== */
@media (max-width: 1200px) {
    :root {
        --sidebar-width: 300px;
    }
}

@media (max-width: 1024px) {
    :root {
        --sidebar-width: 280px;
        --spacing-xl: 1.25rem;
        --spacing-lg: 1rem;
    }

    .navbar {
        padding: 0 var(--spacing-lg);
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .sidebar {
        min-width: 280px;
        width: 280px;
        flex-shrink: 0;
    }

    .sidebar-content {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }

    .sidebar-section {
        padding: var(--spacing-md);
    }

    .section-title {
        font-size: 0.938rem;
        margin-bottom: var(--spacing-md);
    }

    /* Room selector height overrides removed to prevent internal scrolls */
    .room-list {
        min-height: auto;
        max-height: none;
    }

    .canvas-header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .canvas-title {
        font-size: 1.125rem;
    }

    .canvas-wrapper {
        padding: var(--spacing-lg);
    }

    .canvas-info {
        padding: var(--spacing-md) var(--spacing-lg);
        gap: var(--spacing-md);
        flex-wrap: wrap;
    }

    .quality-card {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 900px) {
    :root {
        --sidebar-width: 260px;
    }

    .sidebar {
        min-width: 260px;
        width: 260px;
        flex-shrink: 0;
    }

    .logo-icon {
        width: 32px;
        height: 32px;
    }

    .logo-text {
        font-size: 1.125rem;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }

    .main-container {
        flex-direction: column;
        height: auto;
        min-height: calc(100vh - var(--navbar-height));
    }

    .sidebar {
        width: 100%;
        min-width: 100%;
        max-width: 100%;
        max-height: none;
        flex-shrink: 1;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .canvas-area {
        min-height: 500px;
    }

    .canvas-title {
        font-size: 1rem;
    }

    .control-btn {
        width: 36px;
        height: 36px;
    }

    .control-btn svg {
        width: 18px;
        height: 18px;
    }

    .canvas-info {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
    }

    .room-selector {
        gap: var(--spacing-sm);
    }

    .room-list {
        min-height: auto;
        max-height: none;
    }

    .quality-options {
        gap: var(--spacing-xs);
    }
}

@media (max-width: 640px) {
    .navbar {
        padding: 0 var(--spacing-md);
    }

    .sidebar-content {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .sidebar-section {
        padding: var(--spacing-sm);
    }

    .canvas-header {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .canvas-controls {
        align-self: flex-end;
    }

    .canvas-wrapper {
        padding: var(--spacing-md);
    }

    .room-chip span,
    .selected-room-name {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .canvas-area {
        min-height: 400px;
    }

    .canvas-title {
        font-size: 0.938rem;
    }

    .control-btn {
        width: 32px;
        height: 32px;
    }

    .control-btn svg {
        width: 16px;
        height: 16px;
    }
}