/* Fidordia Yazılım Teknolojileri A.Ş. — kurumsal tanıtım sitesi.
   Tek sayfalık iskelet; detaylandırma sonraki aşamada. Harici kaynak
   (font/CDN/analytics) yok — nginx'teki CSP `default-src 'self'` ile uyumlu. */

:root {
    --bg: #ffffff;
    --bg-alt: #f6f8fa;
    --fg: #16202c;
    --fg-muted: #5a6b7d;
    --accent: #0f6c74;
    --accent-strong: #0a4d53;
    --border: #dfe5ec;
    --max: 68rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #10171f;
        --bg-alt: #16202c;
        --fg: #e8eef4;
        --fg-muted: #9db0c2;
        --accent: #3fb2b8;
        --accent-strong: #6fd3d8;
        --border: #24313f;
    }
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.7;
}

a {
    color: var(--accent);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

a:hover {
    color: var(--accent-strong);
}

.wrap {
    max-width: var(--max);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Üst bant --- */

.site-header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

.site-header .wrap {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.1rem;
    padding-bottom: 1.1rem;
}

.brand {
    display: inline-flex;
    align-items: baseline;
    gap: 0.55rem;
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.01em;
    color: var(--fg);
    text-decoration: none;
}

.brand span {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--fg-muted);
}

.lang-switch {
    font-size: 0.9rem;
    color: var(--fg-muted);
}

.lang-switch a {
    text-decoration: none;
    padding: 0.2rem 0.1rem;
}

.lang-switch [aria-current="true"] {
    color: var(--fg);
    font-weight: 600;
}

/* --- Giriş --- */

.hero {
    padding: 4.5rem 0 3.5rem;
}

.hero h1 {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero p {
    margin: 0;
    max-width: 42rem;
    font-size: 1.12rem;
    color: var(--fg-muted);
}

/* --- Bölümler --- */

section {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
}

section h2 {
    margin: 0 0 1.5rem;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
}

.cards {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.4rem;
}

.card h3 {
    margin: 0 0 0.5rem;
    font-size: 1.02rem;
}

.card p {
    margin: 0;
    color: var(--fg-muted);
    font-size: 0.96rem;
}

/* --- İletişim --- */

.contact-list {
    margin: 0;
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.contact-list div {
    border-left: 3px solid var(--accent);
    padding-left: 0.9rem;
}

.contact-list dt {
    font-size: 0.76rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--fg-muted);
}

.contact-list dd {
    margin: 0.15rem 0 0;
    font-weight: 500;
}

/* --- Alt bant --- */

.site-footer {
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    padding: 2rem 0;
    font-size: 0.88rem;
    color: var(--fg-muted);
}

.site-footer p {
    margin: 0.2rem 0;
}