/* ===== Design Tokens ===== */
:root {
    /* Colors */
    --primary: #1e3a5f;
    --primary-dark: #152d4a;
    --primary-light: #2a4f7f;
    --accent: #e8733a;
    --accent-dark: #d4612b;
    --accent-light: #f09060;
    --success: #16a34a;

    /* Neutrals */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Semantic */
    --background: var(--gray-50);
    --surface: #ffffff;
    --text: var(--gray-800);
    --text-light: var(--gray-500);
    --border: var(--gray-200);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Radii */
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 150ms;
    --duration: 250ms;
    --duration-slow: 400ms;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ===== Header ===== */
.site-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: box-shadow var(--duration) var(--ease-out);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.25rem;
    flex-wrap: wrap;
    align-items: center;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--duration-fast);
}

.nav-links a:hover {
    color: var(--primary);
}

/* Nav Dropdown */
.nav-dropdown {
    position: relative;
    padding-bottom: 0.5rem;
    margin-bottom: -0.5rem;
}

.nav-dropdown > a {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-dropdown > a::after {
    content: '';
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform var(--duration-fast);
}

.nav-dropdown:hover > a::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem 0;
    min-width: 240px;
    list-style: none;
    z-index: 200;
    padding-top: 1rem;
    border-top: none;
}

.nav-dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    white-space: nowrap;
    transition: background var(--duration-fast), color var(--duration-fast);
}

.dropdown-menu li a:hover {
    background: var(--gray-50);
    color: var(--accent);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2.5rem 1rem 2.5rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(4px);
    padding: 0.375rem 1rem;
    border-radius: 100px;
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    margin-bottom: 1.25rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero h1 {
    font-size: 2.25rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    max-width: 600px;
}

.hero .updated {
    font-size: 0.8125rem;
    opacity: 0.7;
    margin-bottom: 1.25rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

.hero-stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.2;
}

.hero-stat-label {
    font-size: 0.8125rem;
    opacity: 0.75;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
    box-shadow: 0 2px 8px rgba(232, 115, 58, 0.3);
}

.hero-cta:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(232, 115, 58, 0.4);
}

/* Legacy benefit list — hidden by default in new hero */
.benefits-list {
    display: none;
}

.hero .intro {
    display: none;
}

/* ===== Calculator Section ===== */
.calculator-section {
    padding: 2rem 1rem;
    margin-top: -1.5rem;
    position: relative;
    z-index: 2;
}

.calculator-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    max-width: 800px;
    margin: 0 auto;
}

.calculator-card h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text);
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* ===== Project Type Cards ===== */
.project-type-cards {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.project-type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 1rem 0.5rem;
    background: var(--gray-50);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: border-color var(--duration-fast), background var(--duration-fast), box-shadow var(--duration-fast);
    text-align: center;
}

.project-type-card:hover {
    border-color: var(--gray-300);
    background: white;
}

.project-type-card.selected {
    border-color: var(--primary);
    background: rgba(30, 58, 95, 0.04);
    box-shadow: 0 0 0 1px var(--primary);
}

.project-type-card svg {
    width: 28px;
    height: 28px;
    color: var(--gray-500);
    transition: color var(--duration-fast);
}

.project-type-card.selected svg {
    color: var(--primary);
}

.project-type-card .card-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-700);
    line-height: 1.2;
}

.project-type-card .card-desc {
    font-size: 0.6875rem;
    color: var(--gray-400);
    line-height: 1.3;
}

.project-type-card.selected .card-label {
    color: var(--primary);
}

/* ===== Form Styles ===== */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
    font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
    color: var(--text);
    background: var(--surface);
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: var(--gray-300);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.12);
}

.dimensions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: end;
}

/* Custom Checkbox */
.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.75rem 1rem;
    background: var(--gray-50);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    transition: border-color var(--duration-fast), background var(--duration-fast);
}

.checkbox-group label:hover {
    border-color: var(--gray-300);
    background: white;
}

.checkbox-group input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    min-width: 1.25rem;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: background var(--duration-fast), border-color var(--duration-fast);
}

.checkbox-group input[type="checkbox"]:checked {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-group input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-group span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

/* ===== Calculate Button ===== */
.btn-calculate {
    width: 100%;
    padding: 1rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1.0625rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
    margin-top: 1rem;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-calculate:hover {
    background: var(--accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(232, 115, 58, 0.3);
}

.btn-calculate:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-calculate.loading {
    pointer-events: none;
    opacity: 0.85;
}

.btn-calculate .spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-calculate.loading .spinner {
    display: block;
}

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

/* ===== Results Section ===== */
.results-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border);
}

.results-section h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--success);
    font-weight: 700;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.result-card {
    background: var(--gray-50);
    padding: 1.25rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform var(--duration-fast), box-shadow var(--duration-fast);
    opacity: 0;
    transform: translateY(12px);
    animation: resultCardIn 0.4s var(--ease-out) forwards;
}

.result-card:nth-child(1) { animation-delay: 0ms; }
.result-card:nth-child(2) { animation-delay: 100ms; }
.result-card:nth-child(3) { animation-delay: 200ms; }
.result-card:nth-child(4) { animation-delay: 300ms; }

@keyframes resultCardIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.result-card.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    grid-column: span 2;
    box-shadow: var(--shadow-lg);
}

.result-card.primary:hover {
    box-shadow: var(--shadow-xl);
}

.result-label {
    display: block;
    font-size: 0.8125rem;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.result-card.primary .result-label {
    opacity: 0.85;
}

.result-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.result-card.primary .result-value {
    font-size: 2.5rem;
}

/* ===== Rebar Section ===== */
.rebar-section {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.rebar-section h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.rebar-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.rebar-item {
    text-align: center;
}

.rebar-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-light);
}

.rebar-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
}

/* ===== Truck Recommendation ===== */
.truck-recommendation {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #fef3c7;
    border-radius: var(--radius);
    text-align: center;
}

/* ===== Contractor CTA Section ===== */
.contractor-section {
    padding: 2rem 1rem;
}

.contractor-cta {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    max-width: 800px;
    margin: 0 auto;
    border: 2px solid var(--accent);
    position: relative;
    overflow: hidden;
}

.contractor-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
}

.contractor-cta h3 {
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text);
    font-weight: 700;
}

.cta-intro {
    text-align: center;
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.contractor-cta .benefits ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.contractor-cta .benefits li {
    font-size: 0.9375rem;
    color: var(--gray-700);
}

.disclosure {
    font-size: 0.8125rem;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 1.5rem;
}

/* ===== Lead Form ===== */
.lead-form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.lead-form input,
.lead-form select,
.lead-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    color: var(--text);
    transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.lead-form input:hover,
.lead-form select:hover,
.lead-form textarea:hover {
    border-color: var(--gray-300);
}

.lead-form input:focus,
.lead-form select:focus,
.lead-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.12);
}

.lead-form textarea {
    margin-bottom: 1rem;
}

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1.0625rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
}

.btn-submit:hover {
    background: #15803d;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

.btn-submit:active {
    transform: translateY(0);
    box-shadow: none;
}

.lead-form .disclaimer {
    font-size: 0.75rem;
    color: var(--text-light);
    text-align: center;
    margin-top: 1rem;
}

.lead-form .disclaimer a {
    color: var(--primary);
}

/* ===== Educational Content — Accordion ===== */
.content-section {
    padding: 3rem 1rem;
}

.educational-content {
    max-width: 800px;
    margin: 0 auto;
}

/* Accordion Item */
.accordion-item {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: 0.75rem;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: box-shadow var(--duration-fast);
}

.accordion-item:hover {
    box-shadow: var(--shadow);
}

.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    gap: 1rem;
    transition: background var(--duration-fast);
}

.accordion-header:hover {
    background: var(--gray-50);
}

.accordion-header svg {
    width: 20px;
    height: 20px;
    min-width: 20px;
    color: var(--gray-400);
    transition: transform var(--duration) var(--ease-out);
}

.accordion-item.open .accordion-header svg {
    transform: rotate(180deg);
}

.accordion-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-slow) var(--ease-out);
}

.accordion-panel-inner {
    padding: 0 1.5rem 1.5rem;
}

.accordion-panel-inner p {
    margin-bottom: 1rem;
    color: var(--gray-700);
    line-height: 1.7;
}

.accordion-panel-inner h3 {
    font-size: 1.25rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.accordion-panel-inner h4 {
    font-size: 1.0625rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text);
    font-weight: 600;
}

.accordion-panel-inner ul,
.accordion-panel-inner ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: var(--gray-700);
}

.accordion-panel-inner li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.formula-box {
    background: var(--gray-50);
    padding: 1.5rem;
    border-radius: var(--radius);
    margin: 1.5rem 0;
    border-left: 4px solid var(--primary);
}

.formula-box h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
}

.formula-box code {
    display: block;
    font-size: 0.9375rem;
    background: var(--surface);
    padding: 0.75rem;
    border-radius: var(--radius);
    overflow-x: auto;
}

/* ===== Scroll Reveal ===== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered accordion reveals */
.accordion-item.reveal {
    transition-delay: var(--reveal-delay, 0ms);
}

/* ===== Footer ===== */
.site-footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 1rem 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-brand p {
    margin-top: 0.5rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-links h4,
.footer-legal h4 {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.5);
}

.footer-links ul,
.footer-legal ul {
    list-style: none;
}

.footer-links li,
.footer-legal li {
    margin-bottom: 0.5rem;
}

.footer-links a,
.footer-legal a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--duration-fast);
}

.footer-links a:hover,
.footer-legal a:hover {
    color: white;
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* ===== Calculator Hub ===== */
.calculator-hub-section {
    padding: 2rem 1rem 4rem;
    position: relative;
    z-index: 2;
    margin-top: 0;
}

.calculator-hub-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.calc-hub-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    padding: 2rem;
    text-decoration: none;
    color: var(--text);
    border: 2px solid transparent;
    transition: transform var(--duration) var(--ease-out),
                box-shadow var(--duration) var(--ease-out),
                border-color var(--duration) var(--ease-out);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.calc-hub-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.calc-hub-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-50);
    transition: background var(--duration-fast);
}

.calc-hub-card:hover .calc-hub-icon {
    background: rgba(232, 115, 58, 0.1);
}

.calc-hub-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary);
}

.calc-hub-card:hover .calc-hub-icon svg {
    color: var(--accent);
}

.calc-hub-card h2 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0;
}

.calc-hub-card p {
    font-size: 0.9375rem;
    color: var(--text-light);
    line-height: 1.5;
    margin: 0;
}

.calc-hub-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    margin-top: auto;
    padding-top: 0.5rem;
}

.calc-hub-cta svg {
    width: 16px;
    height: 16px;
    transition: transform var(--duration-fast);
}

.calc-hub-card:hover .calc-hub-cta svg {
    transform: translateX(3px);
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-links {
        gap: 0.75rem;
        font-size: 0.875rem;
    }

    .calculator-hub-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero {
        padding: 2.5rem 1rem 3rem;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 1.25rem;
    }

    .project-type-cards {
        grid-template-columns: repeat(3, 1fr);
    }

    .dimensions-grid {
        grid-template-columns: 1fr;
    }

    .options-grid {
        grid-template-columns: 1fr;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .result-card.primary {
        grid-column: span 1;
    }

    .rebar-grid {
        grid-template-columns: 1fr;
    }

    .lead-form-grid {
        grid-template-columns: 1fr;
    }

    .contractor-cta .benefits ul {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .calculator-card,
    .contractor-cta {
        padding: 1.75rem;
    }

    .accordion-header {
        padding: 1rem 1.25rem;
        font-size: 1rem;
    }

    .accordion-panel-inner {
        padding: 0 1.25rem 1.25rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 1rem;
    }

    .calculator-hub-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 2rem 1rem 2.5rem;
    }

    .hero h1 {
        font-size: 1.375rem;
    }

    .hero-stats {
        gap: 1rem;
    }

    .hero-stat-value {
        font-size: 1.125rem;
    }

    .project-type-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .project-type-cards .project-type-card:last-child {
        grid-column: 1 / -1;
        max-width: calc(50% - 0.375rem);
        justify-self: center;
    }

    .calculator-card {
        padding: 1.25rem;
    }

    .result-card.primary .result-value {
        font-size: 2rem;
    }

    .accordion-header {
        padding: 0.875rem 1rem;
        font-size: 0.9375rem;
    }

    .accordion-panel-inner {
        padding: 0 1rem 1rem;
    }
}

/* ===== Page-specific styles ===== */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.page-content {
    padding: 3rem 1rem;
}

.page-content article {
    max-width: 800px;
    margin: 0 auto;
    background: var(--surface);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    color: var(--text);
    line-height: 1.75;
}

.page-content article h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--gray-200);
}

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

.page-content article h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 1.75rem 0 0.75rem;
}

.page-content article p {
    margin: 0 0 1rem;
    color: var(--gray-700);
}

.page-content article ul,
.page-content article ol {
    margin: 0 0 1.25rem;
    padding-left: 1.5rem;
}

.page-content article li {
    margin-bottom: 0.5rem;
    color: var(--gray-700);
}

.page-content article li strong {
    color: var(--gray-800);
}

.page-content article a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.page-content article a:hover {
    color: var(--accent-dark);
}

@media (max-width: 768px) {
    .page-content article {
        padding: 1.5rem;
    }
    .page-content article h2 {
        font-size: 1.3rem;
    }
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form .form-group {
    margin-bottom: 1.5rem;
}

.contact-form button {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background var(--duration-fast);
}

.contact-form button:hover {
    background: var(--primary-dark);
}

/* Thank you message */
.thank-you-message {
    text-align: center;
    padding: 2rem;
    background: #d1fae5;
    border-radius: var(--radius);
    margin-top: 1rem;
}

.thank-you-message h3 {
    color: var(--success);
    margin-bottom: 0.5rem;
}