/* ============================================
   PROJECT DETAIL PAGES
   ============================================ */

/* Breadcrumb */
.breadcrumb {
    padding-top: 80px;
    font-size: 0.78rem;
    color: var(--c-text-3);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb a {
    color: var(--c-text-3);
    transition: color var(--duration-fast);
}

.breadcrumb a:hover {
    color: var(--c-accent);
}

.breadcrumb-sep {
    color: var(--c-text-3);
    opacity: 0.5;
}

/* Project Hero */
.project-hero {
    padding: 2.5rem 0 var(--s-section);
}

.project-hero .badge {
    margin-bottom: 1rem;
}

.project-hero-title {
    font-family: var(--f-serif);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 0.75rem;
}

.project-hero-tagline {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--c-text-2);
    margin-bottom: 2rem;
}

.project-hero-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.project-hero-link {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--c-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: opacity 0.2s;
}
.project-hero-link:hover { opacity: 0.7; }
.project-hero-link svg { width: 14px; height: 14px; }

.project-description {
    font-size: 1.05rem;
    color: var(--c-text-2);
    line-height: 1.8;
    font-weight: 300;
    max-width: 720px;
}

/* Project Hero Tech Row */
.project-hero .tech-row {
    margin-top: 2rem;
}

/* ============================================
   VIDEO PLAYER
   ============================================ */

.demo-video-wrapper {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--c-border);
    background: #000;
    margin: 2rem 0;
    aspect-ratio: 16 / 9;
}

.demo-video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.demo-video-wrapper--short {
    aspect-ratio: 9 / 16;
    max-width: 360px;
    margin-left: auto;
    margin-right: auto;
}

.demo-video {
    width: 100%;
    display: block;
    border-radius: var(--radius);
}

/* ============================================
   DEMO SECTIONS
   ============================================ */

.demo-section {
    margin-bottom: 3rem;
}

.demo-section-title {
    font-family: var(--f-serif);
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 400;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.demo-section-desc {
    font-size: 0.95rem;
    color: var(--c-text-2);
    line-height: 1.75;
    font-weight: 300;
    max-width: 720px;
    margin-bottom: 1.5rem;
}

/* ============================================
   FORMFLOW SUB-NAV (sticky tabs)
   ============================================ */

.demo-subnav {
    position: sticky;
    top: 64px;
    z-index: 100;
    background: var(--c-bg);
    border-bottom: 1px solid var(--c-border);
    padding: 0.75rem 0;
    margin-bottom: 2.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.demo-subnav-inner {
    display: flex;
    gap: 0.25rem;
    min-width: max-content;
}

.demo-subnav a {
    font-size: 0.78rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    color: var(--c-text-2);
    white-space: nowrap;
    transition: all var(--duration-fast);
}

.demo-subnav a:hover {
    background: var(--c-accent-soft);
    color: var(--c-accent-text);
}

.demo-subnav a.active {
    background: var(--c-accent-soft);
    color: var(--c-accent-text);
}

/* ============================================
   USE CASE SECTION (FormFlow sub-demos)
   ============================================ */

.use-case {
    padding: var(--s-section) 0;
    border-bottom: 1px solid var(--c-border);
}

.use-case:last-of-type {
    border-bottom: none;
}

.use-case-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--c-accent);
    margin-bottom: 0.75rem;
    display: block;
}

.use-case-title {
    font-family: var(--f-serif);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.use-case-content {
    font-size: 0.95rem;
    color: var(--c-text-2);
    line-height: 1.8;
    font-weight: 300;
    max-width: 720px;
}

.use-case-content p + p {
    margin-top: 1.2rem;
}

/* ============================================
   PROJECT NAVIGATION (prev/next)
   ============================================ */

.project-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2.5rem 0;
    border-top: 1px solid var(--c-border);
    margin-top: var(--s-section);
    gap: 1rem;
}

.project-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--c-text-2);
    padding: 0.65rem 1.2rem;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-pill);
    transition: all var(--duration-fast);
}

.project-nav-link:hover {
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.project-nav-link svg {
    width: 16px;
    height: 16px;
}

.project-nav-link--next {
    margin-left: auto;
}

/* ============================================
   DETAIL PAGE FEATURES GRID (expanded)
   ============================================ */

.detail-features {
    padding: var(--s-section) 0;
}

.detail-features .features-grid {
    margin-bottom: 0;
}

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

@media (max-width: 768px) {
    .project-hero-title {
        font-size: clamp(2rem, 8vw, 2.8rem);
    }

    .project-nav {
        flex-direction: column;
        align-items: stretch;
    }

    .project-nav-link {
        justify-content: center;
    }

    .project-nav-link--next {
        margin-left: 0;
    }
}

@media (max-width: 480px) {
    .demo-subnav {
        padding: 0.5rem 0;
    }

    .demo-subnav a {
        font-size: 0.72rem;
        padding: 0.4rem 0.8rem;
    }
}