/* ========================================
   DUALMIND AI AGENCY - Professional Design
   Clean, minimal, conversion-focused
======================================== */

:root {
    --black: #0a0a0a;
    --gray-950: #111113;
    --gray-900: #18181b;
    --gray-800: #27272a;
    --gray-700: #3f3f46;
    --gray-600: #52525b;
    --gray-500: #71717a;
    --gray-400: #a1a1aa;
    --gray-300: #d4d4d8;
    --gray-200: #e4e4e7;
    --gray-100: #f4f4f5;
    --gray-50: #fafafa;
    --white: #ffffff;
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-dark: #1d4ed8;
    --accent-muted: rgba(37, 99, 235, 0.08);
    --green: #059669;
    --green-muted: rgba(5, 150, 105, 0.08);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    color: var(--gray-900);
    line-height: 1.6;
    background: var(--white);
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   TYPOGRAPHY
======================================== */

h1, h2, h3, h4, h5 {
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--gray-900);
}

h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.375rem); }

h1 strong {
    color: var(--accent);
}

p {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ========================================
   BUTTONS
======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: var(--font);
    font-weight: 600;
    font-size: 0.9375rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    white-space: nowrap;
}

.btn-primary {
    background: var(--gray-900);
    color: var(--white);
}
.btn-primary:hover {
    background: var(--black);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-900);
    border: 1px solid var(--gray-300);
}
.btn-ghost:hover {
    border-color: var(--gray-900);
    background: var(--gray-50);
}

.btn-white {
    background: var(--white);
    color: var(--gray-900);
    font-weight: 700;
}
.btn-white:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.btn-nav {
    padding: 8px 20px;
    background: var(--gray-900);
    color: var(--white);
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.875rem;
}
.btn-nav:hover {
    background: var(--black);
}

.btn-full { width: 100%; }

/* ========================================
   NAVIGATION
======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-100);
    transition: box-shadow 0.3s ease;
}
.navbar.scrolled {
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 4px;
}
.logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--gray-900);
}
.logo-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    margin-bottom: -8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: color 0.15s ease;
}
.nav-links a:hover {
    color: var(--gray-900);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    width: 20px;
    height: 1.5px;
    background: var(--gray-900);
    transition: all 0.3s var(--ease);
    display: block;
}
.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}
.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}

/* ========================================
   HERO
======================================== */

.hero {
    padding: 140px 0 80px;
    background: var(--white);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-eyebrow {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 16px;
}

.hero h1 {
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 1.0625rem;
    color: var(--gray-500);
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-metrics {
    display: flex;
    align-items: center;
    gap: 24px;
}
.metric-divider {
    width: 1px;
    height: 40px;
    background: var(--gray-200);
}
.metric-num {
    display: block;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}
.metric-label {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-top: 2px;
}

/* Terminal */
.terminal {
    background: var(--gray-950);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 24px 48px rgba(0,0,0,0.12), 0 0 0 1px rgba(0,0,0,0.05);
}
.terminal-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    background: var(--gray-900);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gray-700);
}
.terminal-dot:first-child { background: #ef4444; }
.terminal-dot:nth-child(2) { background: #eab308; }
.terminal-dot:nth-child(3) { background: #22c55e; }
.terminal-title {
    margin-left: auto;
    font-size: 0.6875rem;
    color: var(--gray-500);
    font-weight: 500;
}
.terminal-body {
    padding: 20px;
    font-size: 0.8125rem;
    font-family: 'SF Mono', 'Fira Code', monospace;
    line-height: 1.8;
}
.terminal-line {
    opacity: 0;
    animation: termFade 0.4s var(--ease) forwards;
    animation-delay: var(--delay, 0s);
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}
.terminal-prompt {
    font-weight: 600;
    flex-shrink: 0;
}
.line-in .terminal-prompt { color: var(--gray-400); }
.line-in span:last-child { color: var(--gray-300); }
.line-out .terminal-prompt { color: var(--accent-light); }
.line-out span:last-child { color: var(--gray-400); }
.line-status {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.line-status span { color: #22c55e; font-weight: 500; }

@keyframes termFade {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========================================
   SECTION COMMON
======================================== */

.section-intro {
    max-width: 640px;
    margin-bottom: 48px;
}
.section-tag {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 12px;
}
.section-desc {
    font-size: 1.0625rem;
    color: var(--gray-500);
    margin-top: 12px;
}

/* ========================================
   PROBLEMS
======================================== */

.problems {
    padding: 96px 0;
    background: var(--gray-50);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.problem-card {
    padding: 28px 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    transition: border-color 0.2s ease;
}
.problem-card:hover {
    border-color: var(--gray-400);
}

.problem-icon {
    width: 40px;
    height: 40px;
    margin-bottom: 16px;
}
.problem-icon svg {
    width: 100%;
    height: 100%;
    color: var(--gray-400);
}

.problem-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.problem-card p {
    font-size: 0.875rem;
    line-height: 1.6;
}

/* ========================================
   SERVICES
======================================== */

.services {
    padding: 96px 0;
}

.services-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    background: var(--gray-200);
    border-radius: 12px;
    overflow: hidden;
}

.service-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 0;
    background: var(--white);
    padding: 32px;
    transition: background 0.2s ease;
}
.service-item:hover {
    background: var(--gray-50);
}
.service-item.featured {
    background: var(--accent-muted);
}
.service-item.featured:hover {
    background: rgba(37, 99, 235, 0.12);
}

.service-num {
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--gray-400);
    padding-top: 4px;
    font-variant-numeric: tabular-nums;
}

.service-header {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}
.service-header h3 {
    margin-bottom: 0;
}

.service-badge {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--accent);
    color: var(--white);
    padding: 3px 10px;
    border-radius: 4px;
}

.service-roi {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--green);
    background: var(--green-muted);
    padding: 3px 10px;
    border-radius: 4px;
}

.service-body > p {
    font-size: 0.9375rem;
    margin-bottom: 16px;
    max-width: 640px;
}

.service-checks {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
}
.service-checks li {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--gray-600);
    position: relative;
    padding-left: 18px;
}
.service-checks li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
}

/* ========================================
   CTA BANNER
======================================== */

.cta-banner {
    padding: 0;
}

.cta-inner {
    background: var(--gray-900);
    border-radius: 16px;
    padding: 56px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    margin: 0 auto;
}

.cta-text h2 {
    color: var(--white);
    margin-bottom: 8px;
}
.cta-text p {
    color: var(--gray-400);
    font-size: 1rem;
    max-width: 480px;
}

/* ========================================
   CASE STUDIES
======================================== */

.cases {
    padding: 96px 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    padding: 28px;
    border: 1px solid var(--gray-200);
    border-radius: 10px;
    transition: border-color 0.2s ease;
}
.case-card:hover {
    border-color: var(--gray-400);
}

.case-tag {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    background: var(--accent-muted);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 16px;
}

.case-card h3 {
    margin-bottom: 16px;
    font-size: 1.25rem;
}

.case-card > p {
    font-size: 0.875rem;
    margin-bottom: 8px;
}
.case-card > p strong {
    color: var(--gray-800);
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
}

.case-metric { text-align: center; }
.cm-value {
    display: block;
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}
.cm-label {
    font-size: 0.6875rem;
    color: var(--gray-500);
    margin-top: 4px;
    display: block;
    line-height: 1.4;
}

/* ========================================
   PROCESS
======================================== */

.process {
    padding: 96px 0;
    background: var(--gray-50);
}

.process-steps {
    max-width: 640px;
}

.step {
    display: flex;
    gap: 24px;
}

.step-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.step-num {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 700;
    color: var(--white);
    background: var(--gray-900);
    border-radius: 50%;
}

.step-line {
    width: 1px;
    flex: 1;
    background: var(--gray-300);
    margin: 8px 0;
}
.step:last-child .step-line {
    display: none;
}

.step-body {
    padding-bottom: 36px;
}
.step:last-child .step-body {
    padding-bottom: 0;
}
.step-body h3 {
    margin-bottom: 6px;
    font-size: 1.0625rem;
}
.step-body p {
    font-size: 0.9375rem;
    margin-bottom: 8px;
}

.step-time {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    background: var(--white);
    border: 1px solid var(--gray-200);
    padding: 2px 10px;
    border-radius: 100px;
}

/* ========================================
   TRUST
======================================== */

.trust {
    padding: 64px 0;
    border-top: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.trust-item svg {
    width: 28px;
    height: 28px;
    color: var(--gray-400);
    margin-bottom: 14px;
}
.trust-item h4 {
    font-size: 0.9375rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.trust-item p {
    font-size: 0.8125rem;
    line-height: 1.6;
}

/* ========================================
   CONTACT
======================================== */

.contact {
    padding: 96px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}

.contact-info h2 {
    margin-bottom: 12px;
}
.contact-desc {
    font-size: 1rem;
    margin-bottom: 28px;
}

.contact-channels {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}
.channel {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 8px;
    transition: background 0.15s ease;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-700);
}
.channel:hover { background: var(--gray-50); }
.channel svg {
    width: 18px;
    height: 18px;
    color: var(--gray-400);
    flex-shrink: 0;
}

.contact-promises {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.contact-promises span {
    font-size: 0.8125rem;
    color: var(--gray-500);
    padding-left: 18px;
    position: relative;
}
.contact-promises span::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
}

/* Form */
.contact-form {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    padding: 32px;
    border-radius: 12px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-field {
    margin-bottom: 16px;
}
.form-field label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}
.form-field input,
.form-field select,
.form-field textarea {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font);
    font-size: 0.9375rem;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    background: var(--white);
    color: var(--gray-900);
    transition: border-color 0.15s ease;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.form-field input::placeholder,
.form-field textarea::placeholder {
    color: var(--gray-400);
}
.form-field textarea { resize: vertical; }

/* ========================================
   FOOTER
======================================== */

.footer {
    background: var(--gray-950);
    padding: 56px 0 32px;
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    margin-bottom: 40px;
}

.footer-brand .logo { margin-bottom: 12px; }
.footer-brand .logo-text { color: var(--white); }
.footer-brand p {
    color: var(--gray-500);
    font-size: 0.875rem;
    max-width: 320px;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}
.footer-col h5 {
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    margin-bottom: 14px;
}
.footer-col a {
    display: block;
    padding: 4px 0;
    font-size: 0.875rem;
    color: var(--gray-500);
    transition: color 0.15s ease;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 24px;
}
.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--gray-600);
}

/* ========================================
   RESPONSIVE
======================================== */

@media (max-width: 1024px) {
    .problems-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: 1fr; }
    .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    .hero-visual { max-width: 520px; }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    }
    .nav-links.active { display: flex; }
    .nav-links a { font-size: 1rem; }
    .mobile-toggle { display: flex; }

    .hero { padding: 100px 0 48px; }
    .hero-metrics { flex-direction: column; align-items: flex-start; gap: 16px; }
    .metric-divider { display: none; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { text-align: center; }

    .problems-grid { grid-template-columns: 1fr; }
    .trust-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .form-row { grid-template-columns: 1fr; }
    .footer-main { grid-template-columns: 1fr; gap: 32px; }

    .service-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    .service-num { display: none; }

    .cta-inner {
        flex-direction: column;
        text-align: center;
        padding: 40px 24px;
    }

    .case-metrics { grid-template-columns: 1fr; }

    .problems, .services, .cases, .process, .contact { padding: 64px 0; }
}

/* ========================================
   ANIMATIONS
======================================== */

.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   CALCULATOR PAGE (shared styles)
======================================== */

.calc-page {
    min-height: 100vh;
    background: var(--gray-50);
    padding: 100px 0 48px;
}

.calc-container {
    max-width: 720px;
    margin: 0 auto;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 40px;
}

.calc-header {
    margin-bottom: 32px;
}
.calc-header h1 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 8px;
}
.calc-header p {
    font-size: 1rem;
}

.progress-track {
    width: 100%;
    height: 3px;
    background: var(--gray-100);
    border-radius: 100px;
    margin-bottom: 32px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--gray-900);
    transition: width 0.4s var(--ease);
    border-radius: 100px;
}

.calc-step {
    display: none;
    animation: calcFade 0.3s var(--ease);
}
.calc-step.active { display: block; }

@keyframes calcFade {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.calc-question {
    margin-bottom: 24px;
}
.calc-question label {
    display: block;
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}
.calc-question .hint {
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 16px;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}
.option-card {
    position: relative;
    padding: 16px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: center;
}
.option-card:hover { border-color: var(--gray-400); }
.option-card.selected {
    border-color: var(--gray-900);
    background: var(--gray-50);
}
.option-card input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}
.option-content {
    font-weight: 700;
    font-size: 1rem;
    color: var(--gray-900);
    margin-bottom: 2px;
}
.option-detail {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.calc-input {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font);
    font-size: 1rem;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    transition: border-color 0.15s ease;
}
.calc-input:focus {
    outline: none;
    border-color: var(--gray-900);
}

.calc-actions {
    display: flex;
    gap: 12px;
    margin-top: 28px;
}

.calc-results {
    padding: 32px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    margin-top: 24px;
}
.calc-results h2 {
    font-size: 1.375rem;
    margin-bottom: 24px;
}

.metrics-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}
.metric-box {
    padding: 20px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    text-align: center;
}
.metric-box .label {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-bottom: 8px;
}
.metric-box .value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--gray-900);
    letter-spacing: -0.02em;
}
.metric-box .value.green { color: var(--green); }
.metric-box .detail {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin-top: 4px;
}

.rec-box {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 24px;
}
.rec-box h3 {
    font-size: 1rem;
    margin-bottom: 12px;
}
.rec-box li {
    padding: 8px 0;
    padding-left: 22px;
    position: relative;
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
}
.rec-box li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--green);
}

.calc-error {
    display: none;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #ef4444;
    margin-top: 12px;
    padding: 8px 12px;
    background: rgba(239, 68, 68, 0.06);
    border-radius: 6px;
}

@media (max-width: 768px) {
    .calc-container { padding: 24px; }
    .metrics-row { grid-template-columns: 1fr; }
    .option-grid { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
}