:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-soft: #f1f5f9;
    --text: #0f172a;
    --muted: #526071;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #dbeafe;
    --border: #dfe6ef;
    --nav-bg: rgba(248, 250, 252, 0.88);
    --overlay: rgba(15, 23, 42, 0.76);
    --shadow: 0 18px 45px rgba(15, 23, 42, 0.09);
    --radius: 20px;
    --transition: 180ms ease;
}

[data-theme="dark"] {
    --bg: #07111f;
    --surface: #0f1c2e;
    --surface-soft: #15243a;
    --text: #f8fafc;
    --muted: #a6b3c4;
    --primary: #60a5fa;
    --primary-hover: #93c5fd;
    --primary-soft: rgba(37, 99, 235, 0.2);
    --border: #26374d;
    --nav-bg: rgba(7, 17, 31, 0.88);
    --overlay: rgba(0, 0, 0, 0.82);
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
    min-width: 320px;
    background: var(--bg);
    color: var(--text);
    font-family: "Inter", system-ui, sans-serif;
    line-height: 1.65;
    transition: background-color var(--transition), color var(--transition);
}
body.modal-open { overflow: hidden; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; }
img, video { display: block; max-width: 100%; }

.skip-link {
    position: fixed;
    left: 1rem;
    top: -5rem;
    z-index: 3000;
    padding: .7rem 1rem;
    border-radius: 8px;
    background: var(--text);
    color: var(--bg);
    text-decoration: none;
}
.skip-link:focus { top: 1rem; }

.navbar {
    position: fixed;
    inset: 0 0 auto;
    z-index: 1000;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    min-height: 76px;
    padding: 0 max(5vw, 1.25rem);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
}
.logo { font-size: 1.35rem; font-weight: 800; letter-spacing: -.04em; text-decoration: none; }
.logo span { color: var(--primary); }
.nav-links { display: flex; justify-content: center; gap: clamp(1rem, 2.4vw, 2rem); list-style: none; }
.nav-links a { color: var(--muted); font-size: .9rem; font-weight: 600; text-decoration: none; transition: color var(--transition); }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--primary); }
/* Sayfadan ayrılan tek menü bağlantısı (hizmet sitesi) — ayırt edilsin diye vurgulu. */
.nav-links a.nav-services { color: var(--primary); }
.nav-links a.nav-services::after { content: "\2197"; margin-left: .2rem; font-size: .85em; }
.nav-controls { display: flex; align-items: center; gap: .65rem; }
.lang-btn, .theme-btn, .menu-btn {
    display: grid;
    place-items: center;
    min-width: 40px;
    height: 40px;
    padding: 0 .7rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    font-size: .8rem;
    font-weight: 700;
    transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.theme-btn, .menu-btn { padding: 0; font-size: 1.2rem; }
.lang-btn:hover, .theme-btn:hover, .menu-btn:hover { border-color: var(--primary); color: var(--primary); }
.lang-btn:active, .theme-btn:active, .menu-btn:active { transform: scale(.96); }
.menu-btn { display: none; }

main { width: min(1180px, 90vw); margin: 0 auto; padding-top: 76px; }
.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
    align-items: center;
    gap: clamp(3rem, 8vw, 7rem);
    min-height: calc(100vh - 76px);
    padding: 5rem 0;
}
.eyebrow { margin-bottom: .75rem; color: var(--primary); font-size: .78rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.hero h1 { max-width: 720px; font-size: clamp(3.2rem, 7vw, 6rem); font-weight: 800; letter-spacing: -.065em; line-height: .98; }
.hero h2 { max-width: 680px; margin-top: 1.4rem; color: var(--text); font-size: clamp(1.25rem, 2.5vw, 1.8rem); letter-spacing: -.025em; line-height: 1.3; }
.hero-content > p:not(.eyebrow) { max-width: 720px; margin-top: 1.35rem; color: var(--muted); font-size: 1.02rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2rem; }
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: .75rem 1.25rem;
    border: 1px solid var(--primary);
    border-radius: 12px;
    font-size: .92rem;
    font-weight: 700;
    text-decoration: none;
    transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform var(--transition);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); transform: translateY(-2px); }
.btn-secondary { background: transparent; color: var(--primary); }
.btn-secondary:hover { background: var(--primary-soft); transform: translateY(-2px); }
.hero-tags { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 2rem; list-style: none; }
.hero-tags li, .project-tags li { padding: .4rem .7rem; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--muted); font-size: .74rem; font-weight: 600; }
.hero-image { position: relative; isolation: isolate; }
.hero-image img { width: min(100%, 430px); aspect-ratio: 1; margin-left: auto; border: 8px solid var(--surface); border-radius: 34% 66% 58% 42% / 43% 39% 61% 57%; box-shadow: var(--shadow); object-fit: cover; object-position: 50% 38%; }
.image-ring { position: absolute; inset: -7% -8% 8% 12%; z-index: -1; border: 1px solid var(--primary); border-radius: 59% 41% 34% 66% / 54% 62% 38% 46%; opacity: .35; }

/* Hero ile projeler arasındaki hizmet sitesi tanıtım bandı. */
.services-banner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: clamp(1.5rem, 4vw, 2.5rem);
    padding: clamp(1.75rem, 4vw, 2.75rem);
    border: 1px solid color-mix(in srgb, var(--primary) 38%, var(--border));
    border-radius: var(--radius);
    background: linear-gradient(145deg, var(--primary-soft), var(--surface) 60%);
    box-shadow: 0 1px 2px rgba(15, 23, 42, .04);
}
.services-banner-copy { max-width: 640px; }
.services-banner h2 { font-size: clamp(1.45rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.04em; line-height: 1.18; }
.services-banner-copy > p:not(.eyebrow) { margin-top: .9rem; color: var(--muted); }
.services-banner-btn { flex: 0 0 auto; gap: .5rem; }
.services-banner-btn i { transition: transform var(--transition); }
.services-banner-btn:hover i { transform: translateX(4px); }

.section { padding: 6.5rem 0; border-top: 1px solid var(--border); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 3rem; margin-bottom: 2.5rem; }
.section-title { font-size: clamp(2rem, 5vw, 3.7rem); font-weight: 800; letter-spacing: -.055em; line-height: 1.08; }
.section-intro { max-width: 500px; color: var(--muted); }

.projects-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.1rem; }
.project-card { display: flex; flex-direction: column; min-height: 360px; padding: clamp(1.5rem, 3vw, 2.2rem); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); box-shadow: 0 1px 2px rgba(15, 23, 42, .04); transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition); }
.project-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--primary) 45%, var(--border)); box-shadow: var(--shadow); }
.featured-card { background: linear-gradient(145deg, var(--primary-soft), var(--surface) 55%); border-color: color-mix(in srgb, var(--primary) 38%, var(--border)); }
.project-card-top { display: flex; align-items: center; justify-content: space-between; min-height: 38px; margin-bottom: 2rem; }
.project-number { color: var(--muted); font-size: .82rem; font-weight: 700; }
.project-badge { padding: .4rem .65rem; border-radius: 999px; background: var(--primary); color: #fff; font-size: .68rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.project-icon { color: var(--primary); font-size: 1.65rem; }
.project-card h3 { max-width: 520px; font-size: clamp(1.35rem, 2.5vw, 1.7rem); letter-spacing: -.035em; line-height: 1.2; }
.project-card > p { margin-top: 1rem; color: var(--muted); }
.project-tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1.25rem; list-style: none; }
.project-tags li { background: var(--surface-soft); }
.open-modal-btn { display: inline-flex; align-items: center; align-self: flex-start; gap: .45rem; margin-top: auto; padding-top: 1.75rem; border: 0; background: transparent; color: var(--primary); cursor: pointer; font-size: .9rem; font-weight: 800; }
.open-modal-btn i { transition: transform var(--transition); }
.open-modal-btn:hover i { transform: translateX(4px); }

.ai-section { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: clamp(3rem, 7vw, 6rem); }
.ai-intro { position: sticky; top: 120px; align-self: start; }
.ai-intro .section-title { max-width: 510px; }
.ai-intro > p:not(.eyebrow) { margin-top: 1.35rem; color: var(--muted); }
.process-grid { display: grid; gap: .85rem; list-style: none; }
.process-grid li { display: grid; grid-template-columns: 48px 1fr; gap: 1rem; padding: 1.25rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); }
.process-grid li > span { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: var(--primary-soft); color: var(--primary); font-size: .78rem; font-weight: 800; }
.process-grid h3 { margin-bottom: .2rem; font-size: 1rem; }
.process-grid p { color: var(--muted); font-size: .88rem; }
.ai-note { grid-column: 1 / -1; display: flex; align-items: flex-start; gap: .85rem; margin-top: 1rem; padding: 1.2rem 1.4rem; border-left: 3px solid var(--primary); border-radius: 0 14px 14px 0; background: var(--primary-soft); }
.ai-note i { flex: 0 0 auto; margin-top: .2rem; color: var(--primary); font-size: 1.25rem; }
.ai-note p { color: var(--text); font-size: .92rem; font-weight: 600; }

.education-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.education-card { display: flex; align-items: flex-start; gap: 1rem; padding: 1.4rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); }
.education-card > i { flex: 0 0 auto; padding: .65rem; border-radius: 11px; background: var(--primary-soft); color: var(--primary); font-size: 1.35rem; }
.education-card h3 { font-size: 1rem; line-height: 1.4; }
.education-card p { margin-top: .3rem; color: var(--muted); font-size: .86rem; }

.contact-section { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: clamp(3rem, 8vw, 7rem); }
.contact-section .section-title { max-width: 580px; }
.contact-section > div:first-child > p:last-child { max-width: 580px; margin-top: 1.25rem; color: var(--muted); }
.contact-links { display: grid; gap: .75rem; }
.contact-links a { display: grid; grid-template-columns: 34px 1fr auto; align-items: center; gap: .8rem; padding: 1rem 1.1rem; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); text-decoration: none; font-weight: 700; transition: border-color var(--transition), color var(--transition), transform var(--transition); }
.contact-links a > i:first-child { color: var(--primary); font-size: 1.3rem; }
.contact-links a:hover { transform: translateX(4px); border-color: var(--primary); color: var(--primary); }
footer { padding: 2rem 5vw; border-top: 1px solid var(--border); color: var(--muted); text-align: center; font-size: .82rem; }

.modal-overlay { position: fixed; inset: 0; z-index: 2000; display: grid; place-items: center; padding: 1.5rem; background: var(--overlay); opacity: 0; visibility: hidden; transition: opacity var(--transition), visibility var(--transition); }
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-content { position: relative; width: min(880px, 100%); max-height: min(90vh, 900px); overflow-y: auto; padding: 1.25rem; border: 1px solid var(--border); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow); transform: translateY(18px) scale(.985); transition: transform var(--transition); }
.modal-overlay.active .modal-content { transform: none; }
.close-modal { position: absolute; top: .75rem; right: .75rem; z-index: 2; display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 50%; background: var(--surface); color: var(--text); cursor: pointer; font-size: 1.3rem; }
.modal-slider-container { position: relative; width: 100%; aspect-ratio: 16 / 9; overflow: hidden; border-radius: 15px; background: var(--surface-soft); }
.modal-slider { display: flex; height: 100%; transition: transform 360ms ease; }
.slider-item { display: grid; flex: 0 0 100%; place-items: center; height: 100%; }
.slider-item img, .slider-item video { width: 100%; height: 100%; object-fit: contain; }
.slider-nav { position: absolute; top: 50%; display: grid; place-items: center; width: 42px; height: 42px; border: 0; border-radius: 50%; background: rgba(15, 23, 42, .72); color: #fff; cursor: pointer; font-size: 1.15rem; transform: translateY(-50%); }
.slider-nav:hover { background: var(--primary); }
.slider-nav[hidden] { display: none; }
.slider-nav.prev { left: .75rem; }
.slider-nav.next { right: .75rem; }
.modal-copy { padding: 1.5rem .5rem .5rem; }
.modal-copy h3 { margin-bottom: .8rem; font-size: clamp(1.4rem, 3vw, 2rem); letter-spacing: -.035em; line-height: 1.2; }
.modal-copy #modal-desc { color: var(--muted); white-space: pre-line; }

:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 70%, transparent); outline-offset: 3px; }

@media (max-width: 900px) {
    .navbar { grid-template-columns: auto 1fr auto; }
    .menu-btn { display: grid; justify-self: end; margin-right: .65rem; }
    .nav-controls { grid-column: 3; }
    .nav-links { position: absolute; inset: 76px 0 auto; display: none; flex-direction: column; gap: 0; padding: .7rem 5vw 1rem; border-bottom: 1px solid var(--border); background: var(--bg); box-shadow: var(--shadow); }
    .nav-links.open { display: flex; }
    .nav-links a { display: block; padding: .8rem 0; }
    .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 4rem; text-align: center; }
    .hero-content { display: flex; flex-direction: column; align-items: center; }
    .hero-image { grid-row: 1; width: min(76vw, 360px); margin: 0 auto; }
    .hero-image img { margin: auto; }
    .services-banner { flex-direction: column; align-items: flex-start; }
    .section-heading { align-items: flex-start; flex-direction: column; gap: 1rem; }
    .projects-grid { grid-template-columns: 1fr; }
    .project-card { min-height: 330px; }
    .ai-section, .contact-section { grid-template-columns: 1fr; }
    .ai-intro { position: static; }
    .ai-note { grid-column: auto; }
}

@media (max-width: 600px) {
    main { width: min(100% - 2rem, 1180px); }
    .navbar { padding-inline: 1rem; }
    .hero { padding-block: 3rem 4.5rem; }
    .hero h1 { font-size: clamp(2.9rem, 16vw, 4rem); }
    .hero-actions { width: 100%; }
    .btn-primary, .btn-secondary { width: 100%; }
    .hero-tags { justify-content: center; }
    .section { padding: 4.5rem 0; }
    .education-grid { grid-template-columns: 1fr; }
    .project-card { min-height: 340px; }
    .process-grid li { grid-template-columns: 42px 1fr; padding: 1rem; }
    .modal-overlay { padding: .5rem; }
    .modal-content { max-height: 94vh; padding: .65rem; border-radius: 16px; }
    .modal-slider-container { margin-top: 2.6rem; }
    .modal-copy { padding: 1.2rem .45rem .6rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}