:root {
    --bg-primary: #0f0c08;
    --bg-surface: #1c150e;
    --bg-hover: #261d13;
    --bg-input: #140e09;
    --text-primary: #f5eedc;
    --text-secondary: #cbb9a3;
    --text-muted: #8a7663;
    --accent: #d97706;
    --accent-hover: #f59e0b;
    --accent-glow: rgba(217, 119, 6, 0.25);
    --border: #382618;
    --border-highlight: #d97706;
    
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.12);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

/* Header Styling */
.app-header {
    background: linear-gradient(180deg, #18110b 0%, var(--bg-primary) 100%);
    border-bottom: 1px solid var(--border);
    padding: 2.5rem 1.5rem 2rem;
    text-align: center;
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
}

.brand-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(217, 119, 6, 0.15);
    border: 1px solid rgba(217, 119, 6, 0.3);
    color: var(--accent-hover);
    padding: 0.35rem 0.85rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.app-header h1 {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0 0 0.5rem;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #f5eedc 0%, var(--accent-hover) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-header p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Layout */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Calculator Grid Layout */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-top: 1.5rem;
}

@media (max-width: 960px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

/* Panels */
.calc-panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-md);
}

.panel-title {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
}

.title-icon {
    font-size: 1.2rem;
}

/* Form Controls */
.form-group {
    margin-bottom: 1.35rem;
}

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

.group-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;

}

.help-text {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* Segmented Control (Toggle Buttons) */
.segmented-control {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    padding: 0.35rem;
    border-radius: var(--radius-md);
}

.segment-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.65rem 0.75rem;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

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

.segment-btn.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 2px 8px var(--accent-glow);
}

/* Inputs & Selects */
.form-select,
.form-input {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.75rem 0.9rem;
    border-radius: var(--radius-md);
    box-sizing: border-box;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-select:focus,
.form-input:focus {
    outline: none;
    border-color: var(--accent-hover);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.label-with-unit {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.unit-toggle {
    display: flex;
    gap: 0.2rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.15rem;
}

.unit-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;

}

.unit-btn.active {
    background: var(--accent);
    color: #fff;
}

.input-with-postfix {
    position: relative;
    display: flex;
    align-items: center;
}

.input-postfix {
    position: absolute;
    right: 1rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    pointer-events: none;
}

/* Preset Pills */
.preset-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.65rem;
}

.preset-pill {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 0.35rem 0.65rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.preset-pill:hover {
    border-color: var(--accent-hover);
    color: var(--text-primary);
}

.preset-pill.active {
    background: rgba(217, 119, 6, 0.2);
    border-color: var(--accent-hover);
    color: var(--accent-hover);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.col-half {
    flex: 1;
}

/* Safety Status Card */
.safety-card {
    background: linear-gradient(145deg, #241a12 0%, #17110a 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.5rem;

}

.safety-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.safety-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.3rem 0.75rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.safety-badge.badge-sea {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(34, 197, 94, 0.3);
}

.safety-badge.badge-elevated {
    background: var(--warning-bg);
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.3);
}

.safety-badge.badge-extreme {
    background: var(--error-bg);
    color: var(--error);
    border-color: rgba(239, 68, 68, 0.3);
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: currentColor;
    box-shadow: 0 0 8px currentColor;
}

.usda-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Hero Results Grid */
.result-hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.hero-block {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(217, 119, 6, 0.2);
    border-radius: var(--radius-sm);
    padding: 1rem;
    text-align: center;
}

.hero-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 0.3rem;
}

.hero-value-wrap {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.35rem;
}

.hero-value {
    font-family: var(--font-mono);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--accent-hover);
    line-height: 1;
}

.hero-unit {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.hero-subtext {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 0.4rem;
}

/* Physics Ribbon */
.physics-ribbon {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-sm);
    padding: 0.65rem 0.85rem;
    font-size: 0.8rem;

}

.ribbon-item {
    display: flex;
    gap: 0.35rem;
    align-items: center;
}

.ribbon-label {
    color: var(--text-muted);
}

.ribbon-value {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-weight: 600;
}

.ribbon-value.highlight {
    color: var(--accent-hover);
}

/* Visualizer Container & Dual Canvas Layout */
.visualizer-container {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
}

.visualizer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px dashed var(--border);
    padding-bottom: 0.5rem;
}

.visualizer-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
}

.visualizer-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.gauge-canvas-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 600px) {
    .gauge-canvas-wrapper {
        grid-template-columns: 1fr;
    }
}

.canvas-card {
    background: #0d0a07;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    text-align: center;
}

.canvas-label {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.canvas-card canvas {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

.canvas-readout {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-hover);
    margin-top: 0.5rem;
    background: rgba(217, 119, 6, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-block;
}

/* SEO Educational Content Styling */
.content-article {
    margin-top: 3rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;

}

.content-article h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 2rem 0 1rem;

}

.content-article h2:first-child {
    margin-top: 0;
}

.content-article p {
    color: var(--text-secondary);
    font-size: 1.02rem;
    line-height: 1.7;
    margin-bottom: 1.2rem;
}

.info-callout {
    background: linear-gradient(135deg, rgba(217, 119, 6, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
    border-left: 4px solid var(--accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 1.25rem 1.5rem;
    margin: 1.75rem 0;
}

.info-callout h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--accent-hover);
    margin: 0 0 0.5rem;
}

.info-callout p {
    margin-bottom: 0.5rem;
}

.info-callout p:last-child {
    margin-bottom: 0;
}

.rules-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 1.75rem 0;
}

@media (max-width: 768px) {
    .rules-grid {
        grid-template-columns: 1fr;
    }
}

.rule-card {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.rule-card h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0 0 0.85rem;
}

.rule-card ul {
    padding-left: 1.2rem;
    margin-bottom: 1rem;
}

.rule-card li {
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.rule-note {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin: 0;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.75rem 0;
    background: var(--bg-input);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
}

.data-table th,
.data-table td {
    padding: 0.85rem 1.1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: #150e09;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-hover);
}

.data-table td {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.data-table tr:last-child td {
    border-bottom: none;
}

/* Step List */
.step-list {
    padding-left: 1.5rem;
    margin: 1.5rem 0;
}

.step-list li {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    margin-top: 2.5rem;
    border-top: 1px solid var(--border);
    padding-top: 2rem;
}

.faq-item {
    margin-bottom: 1.5rem;
}

.faq-item h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--text-primary);
    margin: 0 0 0.5rem;
}

.faq-item p {
    margin: 0;
}

/* Ad Placeholders */
.ad-placeholder {
    background: #17100b;
    border: 1px dashed var(--border);
    color: var(--text-muted);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin: 1rem auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.ad-desktop {
    width: 728px;
    height: 90px;
}

.ad-mobile {
    width: 320px;
    height: 50px;
    display: none;
}

@media (max-width: 768px) {
    .ad-desktop {
        display: none;
    }
    .ad-mobile {
        display: flex;
    }
    .content-article {
        padding: 1.5rem;
    }
}