/* Sima Group - Ortak stiller */

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

:root {
    /* Sima Group kurumsal palet */
    --color-brand: #0069ae;         /* Sima orijinal mavisi */
    --color-brand-hi: #0a84d2;
    --color-brand-lo: #004d80;

    --color-bg: #0a0f17;
    --color-surface: #111822;
    --color-surface-hi: #1a2331;
    --color-text: #e8ecf1;
    --color-muted: #8a94a4;
    --color-border: rgba(255,255,255,0.08);
    --color-accent: #0069ae;         /* Aynı marka rengi - tüm vurgular için */
    --color-accent-bright: #3fa3e0;  /* Açık mavi vurgu */

    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 22px;

    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

    --shadow-lg: 0 30px 60px -15px rgba(0,0,0,0.5);
}

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

img { max-width: 100%; display: block; }

h1, h2, h3, h4, h5 {
    margin: 0 0 0.5em;
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.7rem); }

.container {
    width: 100%;
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all var(--transition);
    text-transform: uppercase;
}
.btn:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
    transform: translateY(-2px);
}
.btn--solid {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
}
.btn--solid:hover {
    background: #fff;
    border-color: #fff;
}
.btn--ghost {
    padding: 12px 22px;
}

/* Site Switcher — kompakt, logo ağırlıklı */
.site-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 5px 8px 5px 5px;
    background: rgba(10, 15, 23, 0.85);
    backdrop-filter: blur(18px) saturate(180%);
    -webkit-backdrop-filter: blur(18px) saturate(180%);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}

.site-switcher__group {
    display: flex;
    align-items: center;
    padding: 8px 16px 8px 12px;
    border-right: 1px solid var(--color-border);
    margin-right: 6px;
}
.site-switcher__group-mark {
    height: 32px;
    width: auto;
    display: block;
}

.site-switcher__link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 18px;
    min-width: 110px;
    height: 52px;
    border-radius: 10px;
    transition: all var(--transition);
    border: 1px solid transparent;
}
.site-switcher__link:hover {
    background: rgba(255,255,255,0.05);
    border-color: var(--color-border);
}
.site-switcher__link.is-active {
    background: linear-gradient(135deg, var(--color-brand), var(--color-brand-hi));
    border-color: var(--color-brand);
    box-shadow: 0 4px 14px rgba(0,105,174,0.35);
}
.site-switcher__logo {
    max-height: 34px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.2);
    transition: filter 0.3s;
}
.site-switcher__link.is-active .site-switcher__logo {
    filter: brightness(1.9) saturate(0.3);
}
.site-switcher__logo-fallback {
    display: inline-grid; place-items: center;
    width: 22px; height: 22px;
    border-radius: 6px;
    background: var(--color-surface-hi);
    color: var(--color-text);
    font-weight: 800;
    font-size: 0.78rem;
}

/* Yatay menü */
.topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 20px 0;
    background: linear-gradient(180deg, rgba(11,15,20,0.92), rgba(11,15,20,0.55) 70%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background var(--transition);
}

.topbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.topbar__logo img { height: 42px; width: auto; }

.topbar__nav {
    display: flex;
    align-items: center;
    gap: 22px;
}
.topbar__nav > a,
.topbar__nav > .nav-dropdown > a {
    font-size: 0.84rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--color-text);
    padding: 6px 2px;
    position: relative;
    white-space: nowrap;
}
.topbar__nav a {
    font-size: 0.84rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--color-text);
    padding: 6px 2px;
    position: relative;
}
.topbar__nav a::after {
    content: '';
    position: absolute;
    left: 0; bottom: -2px;
    width: 0; height: 2px;
    background: var(--site-color, var(--color-accent));
    transition: width var(--transition);
}
.topbar__nav a:hover::after,
.topbar__nav a.is-active::after { width: 100%; }

.topbar__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 30px;
    background: transparent;
    border: 0;
    cursor: pointer;
    padding: 6px;
    justify-content: center;
}
.topbar__burger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
}

/* Footer */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
    margin-top: 80px;
}
.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}
.footer__title {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-muted);
    margin-bottom: 18px;
}
.footer__logo { height: 54px; margin-bottom: 20px; }
.footer__desc { color: var(--color-muted); font-size: 0.92rem; }
.footer__list { list-style: none; padding: 0; margin: 0; }
.footer__list li { margin-bottom: 10px; font-size: 0.92rem; }
.footer__list a { color: var(--color-muted); }
.footer__list a:hover { color: var(--color-accent); }

.footer__bottom {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    font-size: 0.85rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.footer__credit {
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: rgba(255,255,255,0.42);
}
.footer__credit a {
    color: rgba(255,255,255,0.78);
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.15);
    padding-bottom: 1px;
    transition: color 0.25s ease, border-color 0.25s ease;
}
.footer__credit a:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}
@media (max-width: 600px) {
    .footer__bottom { justify-content: center; text-align: center; }
}

/* Bölüm başlık */
.section {
    padding: 100px 0;
}
.section__header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}
.section__eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 14px;
}
.section__title { margin-bottom: 16px; }
.section__lead { color: var(--color-muted); font-size: 1.05rem; }

/* Proje/blog kart */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}
.card {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: transform var(--transition), border-color var(--transition);
}
.card:hover {
    transform: translateY(-6px);
    border-color: var(--color-accent);
}
.card__media {
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: #000;
}
.card__media img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.8s var(--ease-out);
}
.card:hover .card__media img {
    transform: scale(1.07);
}
.card__body {
    padding: 24px 26px 28px;
}
.card__meta {
    display: flex;
    gap: 12px;
    color: var(--color-muted);
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.card__meta span + span::before { content: '•'; margin-right: 12px; }
.card__title {
    font-size: 1.25rem;
    margin-bottom: 10px;
}
.card__summary {
    color: var(--color-muted);
    font-size: 0.92rem;
}

@media (max-width: 1180px) {
    .topbar__nav { gap: 16px; }
    .topbar__nav > a,
    .topbar__nav > .nav-dropdown > a { font-size: 0.78rem; }
    .site-switcher__group { padding: 6px 12px 6px 8px; }
    .site-switcher__group-mark { height: 26px; }
    .site-switcher__link { min-width: 90px; height: 44px; padding: 6px 12px; }
    .site-switcher__logo { max-height: 26px; }
}

@media (max-width: 1024px) {
    .topbar__nav { display: none; }
    .topbar__burger { display: flex; }
    .topbar__nav.is-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 80px; left: 16px; right: 16px;
        background: var(--color-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--radius);
        padding: 18px;
        gap: 14px;
    }
}

@media (max-width: 900px) {
    .footer__grid { grid-template-columns: 1fr 1fr; gap: 36px; }
    .site-switcher__group { display: none; }
    .site-switcher { padding: 4px; }
    .section { padding: 60px 0; }
}

@media (max-width: 640px) {
    .footer__grid { grid-template-columns: 1fr; }
}