:root {
    /* Light theme colors - Modern minimal palette */
    --bg-primary: #fefefe;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f9fafb;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --accent-hover: #2563eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Typography Scale - Consistent font sizes */
    --font-size-xs: 0.75rem;    /* 12px - small text, captions */
    --font-size-sm: 0.875rem;   /* 14px - form labels, secondary text */
    --font-size-base: 1rem;     /* 16px - body text, buttons */
    --font-size-lg: 1.125rem;   /* 18px - large body text */
    --font-size-xl: 1.25rem;    /* 20px - h5, h6 */
    --font-size-2xl: 1.5rem;    /* 24px - h4 */
    --font-size-3xl: 1.875rem;  /* 30px - h3 */
    --font-size-4xl: 2.25rem;   /* 36px - h2 */
    --font-size-5xl: 3rem;      /* 48px - h1, hero titles */
    
    /* Spacing Scale */
    --spacing-xs: 0.25rem;      /* 4px */
    --spacing-sm: 0.5rem;       /* 8px */
    --spacing-md: 0.75rem;      /* 12px */
    --spacing-lg: 1rem;         /* 16px */
    --spacing-xl: 1.5rem;       /* 24px */
    --spacing-2xl: 2rem;        /* 32px */
}

[data-theme="dark"] {
    /* Dark theme colors - Modern dark aesthetic */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #151515;
    --text-primary: #fafafa;
    --text-secondary: #d4d4d8;
    --text-muted: #a1a1aa;
    --border-color: #262626;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-hover: #4f46e5;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #f87171;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #a855f7 0%, #ec4899 100%);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.25), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.6;
    font-size: var(--font-size-base);
}

h1:focus {
    outline: none;
}

/* Typography - Consistent hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

h1 { 
    font-size: var(--font-size-5xl); 
    font-weight: 700; 
}
h2 { 
    font-size: var(--font-size-4xl); 
    font-weight: 600; 
}
h3 { 
    font-size: var(--font-size-3xl); 
    font-weight: 600; 
}
h4 { 
    font-size: var(--font-size-2xl); 
    font-weight: 600; 
}
h5 { 
    font-size: var(--font-size-xl); 
    font-weight: 600; 
}
h6 { 
    font-size: var(--font-size-lg); 
    font-weight: 600; 
}

a, .btn-link {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover, .btn-link:hover {
    color: var(--accent-hover);
}

/* Modern button system */
.btn {
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    transition: all 0.2s ease;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    text-align: center;
    line-height: 1.4;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-base);
    font-weight: 600;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--gradient-accent);
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #059669;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

/* Form controls */
.form-control, input[type="text"], input[type="number"] {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    line-height: 1.4;
}

.form-control:focus, input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.1);
}

.form-label {
    color: var(--text-primary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
    display: block;
}

/* Alert system */
.alert {
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.alert-info {
    background-color: rgb(59 130 246 / 0.1);
    border-color: rgb(59 130 246 / 0.2);
    color: var(--text-primary);
}

.alert-success {
    background-color: rgb(16 185 129 / 0.1);
    border-color: rgb(16 185 129 / 0.2);
    color: var(--text-primary);
}

.alert-warning {
    background-color: rgb(245 158 11 / 0.1);
    border-color: rgb(245 158 11 / 0.2);
    color: var(--text-primary);
}

/* Layout */
.main-content {
    flex: 1;
    padding: 1rem;
    margin: 0;
    min-height: calc(100vh - 70px);
}

.content {
    padding: 2rem;
    background: transparent;
    margin: 0;
    min-height: calc(100vh - 70px);
}

.page {
    background: var(--bg-primary);
    min-height: 100vh;
    position: relative;
    padding-top: 70px; /* Account for fixed top navbar */
}

/* Add subtle background pattern */
.page::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(circle at 25% 25%, var(--accent-primary) 0%, transparent 50%),
                      radial-gradient(circle at 75% 75%, var(--accent-secondary) 0%, transparent 50%);
    opacity: 0.03;
    z-index: -1;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid red;
}

.validation-message {
    color: red;
}

#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

.loading-progress {
    position: relative;
    display: block;
    width: 8rem;
    height: 8rem;
    margin: 20vh auto 1rem auto;
}

    .loading-progress circle {
        fill: none;
        stroke: #e0e0e0;
        stroke-width: 0.6rem;
        transform-origin: 50% 50%;
        transform: rotate(-90deg);
    }

        .loading-progress circle:last-child {
            stroke: #1b6ec2;
            stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
            transition: stroke-dasharray 0.05s ease-in-out;
        }

.loading-progress-text {
    position: absolute;
    text-align: center;
    font-weight: bold;
    inset: calc(20vh + 3.25rem) 0 auto 0.2rem;
}

    .loading-progress-text:after {
        content: var(--blazor-load-percentage-text, "Loading");
    }

code {
    color: #c02d76;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
    text-align: start;
}

/* Plot styling */
#plotly-div, .plotly-graph-div {
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

/* Removed sidebar-header - no longer needed with top navbar */

.logo-brand-small {
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
}

.logo-brand-small:hover {
    transform: scale(1.05);
    color: var(--text-primary);
}

.logo-icon-small {
    width: 100px;
    height: 100px;
    border-radius: 12px;
    filter: drop-shadow(0 0 6px rgba(102, 126, 234, 0.3));
    transition: all 0.3s ease;
}

.logo-brand-small:hover .logo-icon-small {
    filter: drop-shadow(0 0 12px rgba(102, 126, 234, 0.5));
    transform: rotate(5deg);
}

.logo-text-small {
    display: none !important;
}

/* Main logo styling */
.header-section {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.logo-brand-main {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.logo-brand-main:hover {
    transform: scale(1.05);
    color: var(--text-primary);
}

.logo-icon-main {
    width: 60px;
    height: 60px;
    filter: drop-shadow(0 0 12px rgba(102, 126, 234, 0.4));
    transition: all 0.3s ease;
}

.logo-brand-main:hover .logo-icon-main {
    filter: drop-shadow(0 0 20px rgba(102, 126, 234, 0.6));
    transform: rotate(5deg);
}

.logo-text-container {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo-title {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    margin: 0;
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Modern support section */
.support-section {
    margin: 1rem 0;
    display: flex;
    justify-content: center;
    position: sticky;
    bottom: 2rem;
    z-index: 10;
}

.support-content {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.support-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.support-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.coffee-button-modern {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.coffee-button-modern:hover {
    background: var(--gradient-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

.coffee-button-modern svg {
    opacity: 0.9;
}

/* Top navigation bar styling */
.top-navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    height: 70px;
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.navbar-nav .nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    position: relative;
}

.navbar-nav .nav-link:hover {
    background: var(--bg-secondary);
    color: var(--accent-primary);
}

.navbar-nav .nav-link.active {
    background: var(--gradient-primary);
    color: white;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Modern cards */
.card, .modern-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.card:hover, .modern-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

/* Input group styling */
.input-group {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 1.5fr;
    gap: 1rem;
    align-items: end;
    margin-bottom: 2rem;
}

.input-field {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.input-field input {
    width: 100%;
}

@media (max-width: 1200px) {
    .input-group {
        grid-template-columns: 1fr 1fr 1fr;
        grid-template-rows: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .input-group {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* Theme toggle button in navbar */
.theme-toggle-btn {
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    min-width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle-btn:hover {
    background: var(--gradient-accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* Ensure top-row has enough padding to avoid overlap */
.top-row {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 4rem 1rem 0; /* Extra right padding for theme toggle */
}

/* Version footer */
.version-footer {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    z-index: 999;
    color: var(--text-muted);
    font-size: 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    transition: all 0.2s ease;
}

.version-footer:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* Subtle animations */
.modern-card {
    animation: fadeInUp 0.6s ease-out;
}

.modern-card:nth-child(1) { animation-delay: 0.1s; }
.modern-card:nth-child(2) { animation-delay: 0.2s; }
.modern-card:nth-child(3) { animation-delay: 0.3s; }
.modern-card:nth-child(4) { animation-delay: 0.4s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading state */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Enhanced focus states */
.form-control:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Responsive design */
/* Mobile responsive navbar */
@media (max-width: 768px) {
    .navbar-container {
        padding: 0 var(--spacing-sm);
    }
    
    .navbar-nav {
        gap: var(--spacing-lg);
    }
    
    .navbar-nav .nav-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-sm);
    }
    
    .logo-icon-small {
        width: 60px;
        height: 60px;
    }
    
    .content {
        margin: var(--spacing-xs);
        padding: var(--spacing-lg);
    }
    
    .input-group {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .input-field {
        min-width: auto;
    }
    
    .modern-card {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-lg);
    }
    
    h1 { font-size: var(--font-size-4xl); }
    h3 { font-size: var(--font-size-xl); }
    
    .version-footer {
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .navbar-nav {
        gap: var(--spacing-sm);
    }
    
    .navbar-nav .nav-link {
        padding: 0.25rem 0.25rem;
        font-size: 0.8rem;
    }
    
    .logo-icon-small {
        width: 50px;
        height: 50px;
    }
}

[data-theme="dark"] .material-info-line {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .material-info-line .text-muted {
    color: var(--text-secondary) !important;
}

[data-theme="dark"] .material-info-line small.text-muted {
    color: var(--text-secondary) !important;
    opacity: 0.9;
}

/* --- Landing page styles --- */
.hero-section {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin: var(--spacing-2xl) 0;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-lg);
}

.feature-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    font-size: var(--font-size-2xl);
}

.feature-item p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.syntax-guide {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.cta-section {
    text-align: center;
    margin: 3rem 0;
}

.cta-section .btn-lg {
    font-size: 1.25rem;
    padding: 1rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.workflow-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.workflow-step {
    text-align: center;
    padding: 2rem 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
}

.workflow-step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.workflow-step h5 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.workflow-step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Compact layer card styling */
.layer-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.layer-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.layer-card h5 {
    color: var(--text-primary);
    font-weight: 600;
    font-size: var(--font-size-xl);
    margin: 0;
}

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

.layer-inputs {
    display: flex;
    gap: var(--spacing-lg);
    align-items: end;
}

.layer-input-group {
    flex: 1;
    min-width: 0;
}

.layer-input-group .form-label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.layer-input-group .form-control {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.layer-card .btn-outline-danger {
    border-color: var(--danger);
    color: var(--danger);
    background: transparent;
    transition: all 0.2s ease;
}

.layer-card .btn-outline-danger:hover {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

/* Compact layer card styling */
.layer-card-compact {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all 0.2s ease;
}

.layer-card-compact:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--accent-primary);
}

.layer-number {
    background: var(--accent-primary);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 600;
    flex-shrink: 0;
}

.input-group-compact {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1;
}

.input-label-compact {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.form-control-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

/* Responsive adjustments for compact layers */
@media (max-width: 768px) {
    .layer-card-compact .d-flex {
        flex-direction: column;
        gap: var(--spacing-md) !important;
    }
    
    .layer-card-compact .flex-fill {
        flex-direction: column;
    }
    
    .input-group-compact {
        flex: none;
    }
}

/* Bootstrap Icons */
.bi {
    display: inline-block;
    width: 1em;
    height: 1em;
    margin-right: 0.25rem;
    vertical-align: -0.125em;
}

.bi-plus-circle::before {
    content: "⊕";
}

.bi-trash::before {
    content: "🗑";
}

/* Button gap utility */
.gap-2 {
    gap: 0.5rem;
}

/* Text utility classes */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

small, .small {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* Material info line */
.material-info-line {
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.material-info-line small {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    line-height: 1.5;
}