/* ==========================================================================
   Layout — container, navbar, marka, bölüm iskeleti, sayfa başlığı, footer
   ========================================================================== */

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

main {
    min-height: calc(100dvh - var(--navbar-height));
}

/* ---- Navbar ---- */
.navbar {
    position: fixed;
    top: 0;
    inset-inline-start: 0;
    width: 100%;
    height: var(--navbar-height);
    z-index: var(--z-nav);
    display: flex;
    align-items: center;
    background: rgba(244, 238, 227, 0.72);
    backdrop-filter: blur(14px) saturate(1.1);
    -webkit-backdrop-filter: blur(14px) saturate(1.1);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease, background 0.3s ease;
}

.navbar.scrolled {
    background: rgba(244, 238, 227, 0.92);
    border-bottom-color: var(--rule);
}

.nav-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-inline: var(--gutter);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-inline-start: auto;
}

.nav-menu a {
    position: relative;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--ink-soft);
    padding: 0.35rem 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    inset-inline-start: 0;
    inset-inline-end: 0;
    bottom: 0;
    height: 1px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.45s var(--ease-out);
}

.nav-menu a:hover {
    color: var(--ink);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-menu a.active {
    color: var(--ink);
}

.nav-menu .nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    border: 1px solid var(--ink);
    border-radius: var(--radius-sm);
    color: var(--ink);
    transition: background 0.25s ease, color 0.25s ease;
}

.nav-menu .nav-cta::after {
    display: none;
}

.nav-menu .nav-cta:hover,
.nav-menu .nav-cta.active {
    background: var(--ink);
    color: var(--paper);
}

.nav-tools {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
    margin-inline-end: -10px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--ink);
    transition: transform 0.35s var(--ease-out), opacity 0.2s ease;
}

.hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ---- Marka ---- */
.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--ink);
}

.brand:hover {
    color: var(--ink);
}

.brand-mark {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    transition: transform 0.8s var(--ease-out);
}

.brand:hover .brand-mark {
    transform: rotate(-24deg);
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 1.45rem;
    font-weight: 500;
    letter-spacing: -0.015em;
}

.brand-name span {
    font-style: italic;
    color: var(--accent);
}

.brand-tagline {
    font-family: var(--font-mono);
    font-size: 0.64rem;
    letter-spacing: 0.04em;
    color: var(--ink-muted);
    margin-top: 0.3rem;
}

/* ---- Bölüm iskeleti ---- */
.section {
    padding: clamp(5rem, 10vw, 8.5rem) 0 clamp(5.5rem, 11vw, 9.5rem);
}

.section-sunk {
    background: var(--paper-sunk);
}

.section-rule {
    border-top: 1px solid var(--rule);
}

/* Bölüm başı: solda § etiketi, sağda başlık */
.section-head {
    display: grid;
    grid-template-columns: 3fr 9fr;
    gap: 2rem;
    align-items: start;
    margin-bottom: clamp(3rem, 6vw, 5rem);
}

.section-label {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding-top: 0.9rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-muted);
}

.section-label::before {
    content: '';
    width: 10px;
    height: 10px;
    flex-shrink: 0;
    background: var(--accent);
    clip-path: polygon(50% 0, 62% 38%, 100% 50%, 62% 62%, 50% 100%, 38% 62%, 0 50%, 38% 38%);
}

.section-head h2 {
    max-width: 18ch;
}

.section-head .lead {
    margin-top: 1.5rem;
    font-size: 1.15rem;
    color: var(--ink-soft);
}

/* ---- İç sayfa başlığı ---- */
.page-header {
    padding: calc(var(--navbar-height) + clamp(3rem, 8vw, 6rem)) 0 clamp(2.5rem, 5vw, 4rem);
    border-bottom: 1px solid var(--rule);
}

.page-header .header-content {
    display: grid;
    grid-template-columns: 3fr 9fr;
    gap: 2rem;
    align-items: end;
}

.page-header .crumb {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-muted);
    padding-bottom: 1.1rem;
}

.page-header .crumb a {
    color: var(--ink-muted);
    border-bottom: 1px solid var(--rule-strong);
}

.page-header .crumb a:hover {
    color: var(--accent);
}

.page-header h1 {
    font-size: clamp(3rem, 8vw, 6.4rem);
    line-height: 0.95;
    letter-spacing: -0.035em;
}

.page-header p {
    margin-top: 1.4rem;
    font-size: 1.2rem;
    color: var(--ink-soft);
}

/* ---- Footer ---- */
.footer {
    position: relative;
    background: var(--night);
    color: var(--on-night-muted);
    padding: clamp(4rem, 8vw, 6rem) 0 1.5rem;
    overflow: hidden;
}

.footer a {
    color: var(--on-night);
}

.footer a:hover {
    color: #e0866f;
}

.footer-content {
    display: grid;
    grid-template-columns: 5fr 3fr 4fr;
    gap: clamp(2rem, 5vw, 4rem);
}

.footer-section h3 {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 400;
    color: var(--on-night-muted);
    margin-bottom: 1.2rem;
}

.footer-section p {
    color: var(--on-night-muted);
    font-size: 0.95rem;
}

.footer .brand,
.footer .brand-name {
    color: var(--on-night);
}

.footer .brand-name span {
    color: #e0866f;
}

.footer .brand-tagline {
    color: var(--on-night-muted);
}

.footer-about {
    margin-top: 1.2rem;
    max-width: 42ch;
}

.footer-links li + li {
    margin-top: 0.6rem;
}

.footer-links a {
    font-family: var(--font-display);
    font-size: 1.25rem;
}

.footer-pilot p {
    margin-top: 1rem;
}

.footer-pilot p a {
    border-bottom: 1px solid currentColor;
}

.tubitak-logo {
    display: inline-flex;
    padding: 0.7rem 1rem;
    background: var(--paper);
    border-radius: var(--radius-sm);
}

.tubitak-logo img {
    height: 40px;
    width: auto;
}

/* Dev kelime işareti */
.footer-wordmark {
    margin-top: clamp(3rem, 6vw, 5rem);
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(4.5rem, 17vw, 15rem);
    line-height: 0.8;
    letter-spacing: -0.05em;
    color: var(--night-raised);
    -webkit-text-stroke: 1px rgba(239, 231, 216, 0.14);
    user-select: none;
    white-space: nowrap;
}

.footer-wordmark em {
    font-style: italic;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
    padding-top: 1.2rem;
    border-top: 1px solid rgba(239, 231, 216, 0.12);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.footer-bottom p {
    max-width: none;
    color: var(--on-night-muted);
}

.footer-bottom a {
    border-bottom: 1px solid rgba(239, 231, 216, 0.35);
}