/* ============================================================
   RECALL FOR REVIT — Marketing Website
   Design language: Architectural drawings, AEC, clean technical
   ============================================================ */

:root {
    --color-primary: #0696D7;
    --color-primary-hover: #0580B8;
    --color-dark: #2C3E50;
    --color-dark-lighter: #34495E;
    --color-bg: #F7F8FA;
    --color-white: #FFFFFF;
    --color-text: #1A1A2E;
    --color-text-secondary: #5A6270;
    --color-text-muted: #8E99A4;
    --color-border: #DDE1E6;
    --color-accent-light: #E8F4FD;
    --color-success: #27AE60;
    --color-danger: #E74C3C;

    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', Consolas, monospace;

    --max-width: 1200px;
    --max-width-narrow: 800px;
    --nav-height: 72px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */

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

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
    font-family: var(--font-body);
    color: var(--color-text);
    line-height: 1.6;
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container--narrow {
    max-width: var(--max-width-narrow);
    margin: 0 auto;
    padding: 0 24px;
}

.mono {
    font-family: var(--font-mono);
    font-size: 0.85em;
    letter-spacing: 0.02em;
}

.dim { color: var(--color-text-muted); font-size: 0.85em; }
.check { color: var(--color-success); font-weight: 700; font-size: 1.2em; }
.cross { color: var(--color-danger); font-weight: 700; font-size: 1.2em; }

/* Section helpers */
.section-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
}

/* ============================================================
   DIMENSION LINE DIVIDER
   Horizontal rule styled like architectural dimension lines
   ============================================================ */

section {
    padding: 96px 0;
    position: relative;
}

section:not(:last-of-type)::after {
    content: '';
    display: block;
    width: 120px;
    height: 1px;
    background: var(--color-border);
    margin: 0 auto;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

section:not(:last-of-type)::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-white);
    z-index: 1;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    border: 2px solid transparent;
}

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

.btn--outline {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn--outline:hover {
    background: var(--color-accent-light);
    color: var(--color-primary);
}

.btn--sm { padding: 8px 20px; font-size: 0.875rem; }
.btn--lg { padding: 14px 32px; font-size: 1rem; }
.btn--full { width: 100%; padding-top: 14px; padding-bottom: 14px; font-size: 1rem; }

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

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow 0.3s;
}

.nav--scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06); }

.nav__container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.nav__logo-icon {
    width: 36px;
    height: 36px;
    background: var(--color-dark);
    color: var(--color-white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.1rem;
}

.nav__logo-text {
    font-weight: 700;
    font-size: 1.2rem;
}

.nav__links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav__links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav__links a:hover { color: var(--color-text); }

.nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav__hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s;
}

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

.hero {
    padding: 160px 0 96px;
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

/* Architectural grid background */
.hero__grid-bg {
    position: absolute;
    inset: 0;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(0,0,0,0.03) 39px, rgba(0,0,0,0.03) 40px),
        repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(0,0,0,0.03) 39px, rgba(0,0,0,0.03) 40px);
    pointer-events: none;
}

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

.hero__title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 20px;
    color: var(--color-dark);
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero__actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.hero__secondary-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}
.hero__secondary-link span { transition: transform 0.2s; display: inline-block; }
.hero__secondary-link:hover span { transform: translateY(3px); }

.hero__screenshot-frame {
    border: 2px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--color-white);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.hero__screenshot-placeholder {
    aspect-ratio: 4 / 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(0,0,0,0.02) 19px, rgba(0,0,0,0.02) 20px),
        repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(0,0,0,0.02) 19px, rgba(0,0,0,0.02) 20px);
    color: var(--color-text-muted);
}

/* ============================================================
   PROBLEM
   ============================================================ */

.problem {
    background: var(--color-white);
    text-align: center;
}

.problem__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.problem__card {
    padding: 32px 24px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-align: left;
}

.problem__icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.problem__card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.problem__card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============================================================
   FEATURES
   ============================================================ */

.features {
    background: var(--color-bg);
    text-align: center;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.feature-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: left;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 20px rgba(6, 150, 215, 0.08);
}

.feature-card__number {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-primary);
    margin-bottom: 12px;
    font-weight: 500;
}

.feature-card h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */

.how-it-works {
    background: var(--color-dark);
    color: var(--color-white);
    text-align: center;
}

.how-it-works .section-label { color: rgba(255,255,255,0.5); }
.how-it-works .section-title { color: var(--color-white); }

.how-it-works::after, .how-it-works::before { display: none; }

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    margin-top: 56px;
}

.step {
    flex: 1;
    max-width: 300px;
    text-align: center;
}

/* Callout bubble — references Revit's detail callout symbol */
.step__callout {
    width: 56px;
    height: 56px;
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-dark);
}

.step__connector {
    width: 60px;
    height: 2px;
    background: var(--color-dark-lighter);
    margin-top: 28px;
    position: relative;
}

/* Dimension tick marks */
.step__connector::before,
.step__connector::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 8px;
    background: var(--color-dark-lighter);
    top: -3px;
}
.step__connector::before { left: 0; }
.step__connector::after { right: 0; }

.step h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.step p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================================
   COMPARISON
   ============================================================ */

.comparison {
    background: var(--color-white);
    text-align: center;
}

.comparison__table-wrapper {
    overflow-x: auto;
    margin-top: 48px;
}

.comparison__table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.comparison__table th,
.comparison__table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}

.comparison__table thead th {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    border-bottom: 2px solid var(--color-border);
}

.comparison__highlight {
    background: var(--color-accent-light);
    font-weight: 600;
    color: var(--color-text);
}

.comparison__table thead .comparison__highlight {
    color: var(--color-primary);
}

/* ============================================================
   PRICING
   ============================================================ */

.pricing {
    background: var(--color-bg);
    text-align: center;
}

.pricing__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
    align-items: start;
}

.pricing-card {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 36px 28px;
    text-align: left;
    position: relative;
}

.pricing-card--featured {
    border-color: var(--color-primary);
    box-shadow: 0 8px 40px rgba(6, 150, 215, 0.12);
    transform: scale(1.03);
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 16px;
    border-radius: 20px;
    letter-spacing: 0.03em;
}

.pricing-card__header h3 {
    font-size: 1.2rem;
    margin-bottom: 4px;
}

.pricing-card__desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.pricing-card__price {
    margin: 24px 0;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.pricing-card__amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.pricing-card__period {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.pricing-card__features {
    list-style: none;
    margin-bottom: 28px;
}

.pricing-card__features li {
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

.pricing-card__features li:last-child { border-bottom: none; }

.pricing-card__features li::before {
    content: '\2713';
    color: var(--color-success);
    margin-right: 8px;
    font-weight: 700;
}

.pricing__contact {
    margin-top: 36px;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

/* ============================================================
   FAQ
   ============================================================ */

.faq {
    background: var(--color-white);
    text-align: center;
}

.faq__list {
    margin-top: 48px;
    text-align: left;
}

.faq__item {
    border-bottom: 1px solid var(--color-border);
}

.faq__item summary {
    padding: 20px 0;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text);
}

.faq__item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--color-text-muted);
    transition: transform 0.2s;
}

.faq__item[open] summary::after {
    content: '\2212';
}

.faq__item summary::-webkit-details-marker { display: none; }

.faq__item p {
    padding: 0 0 20px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

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

.footer {
    background: var(--color-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 48px 0 32px;
}

.footer::after, .footer::before { display: none; }

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer__brand .nav__logo-icon {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
    background: rgba(255, 255, 255, 0.1);
}

.footer__brand .nav__logo-text { color: var(--color-white); }
.footer__tagline { color: rgba(255, 255, 255, 0.5); font-size: 0.9rem; }

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

.footer__links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.85rem;
}
.footer__links a:hover { color: var(--color-white); }

.footer__bottom {
    padding-top: 24px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer__trademark {
    margin-top: 8px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.25);
    line-height: 1.5;
}

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

@media (max-width: 1024px) {
    .hero .container { grid-template-columns: 1fr; text-align: center; }
    .hero__subtitle { margin: 0 auto 32px; }
    .hero__actions { justify-content: center; }
    .hero__visual { max-width: 500px; margin: 0 auto; }
    .hero__title { font-size: 2.4rem; }

    .features__grid { grid-template-columns: repeat(2, 1fr); }
    .pricing__grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-card:last-child { grid-column: 1 / -1; max-width: 400px; margin: 0 auto; }
    .pricing-card--featured { transform: none; }
}

@media (max-width: 768px) {
    :root { --nav-height: 64px; }

    .section-title { font-size: 1.7rem; }
    section { padding: 64px 0; }

    .nav__links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 16px 24px;
        gap: 0;
        border-bottom: 1px solid var(--color-border);
        box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    }

    .nav__links.active { display: flex; }
    .nav__links li a { display: block; padding: 12px 0; }

    .nav__cta { display: none; }
    .nav__hamburger { display: flex; }

    .hero { padding: 120px 0 64px; }
    .hero__title { font-size: 2rem; }

    .problem__grid { grid-template-columns: 1fr; }
    .features__grid { grid-template-columns: 1fr; }
    .pricing__grid { grid-template-columns: 1fr; }
    .pricing-card:last-child { max-width: none; }

    .steps { flex-direction: column; align-items: center; gap: 0; }
    .step__connector {
        width: 2px;
        height: 40px;
        margin: 0 auto;
    }
    .step__connector::before { top: 0; left: -3px; width: 8px; height: 2px; }
    .step__connector::after { bottom: 0; top: auto; left: -3px; width: 8px; height: 2px; }

    .comparison__table { font-size: 0.85rem; }
    .comparison__table th, .comparison__table td { padding: 12px 10px; }

    .footer__content { flex-direction: column; gap: 20px; text-align: center; }
}

@media (max-width: 480px) {
    .hero__title { font-size: 1.6rem; }
    .hero__actions { flex-direction: column; gap: 16px; }
    .pricing-card__amount { font-size: 2rem; }
}