/* LearnGuage site — tek stil dosyasi. Harici font/CDN yok (hiz + gizlilik).
   Sade cizgi korunuyor; hareket ve derinlik olculu eklendi.
   TUM hareket `prefers-reduced-motion` ile kapanir. */

:root {
    --bg: #ffffff;
    --bg-soft: #f7f8fa;
    --bg-elev: #ffffff;
    --fg: #1a2230;
    --fg-muted: #64707f;
    --line: #e6e9ee;
    --accent: #2563eb;
    --accent-2: #7c3aed;
    --accent-fg: #ffffff;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
    --shadow-md: 0 8px 24px rgba(16, 24, 40, .10);
    --shadow-lg: 0 18px 48px rgba(16, 24, 40, .16);
    --radius: 14px;
    --radius-lg: 22px;
    --maxw: 780px;
    --maxw-wide: 1100px;
    --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1017;
        --bg-soft: #141922;
        --bg-elev: #161c26;
        --fg: #e7ebf2;
        --fg-muted: #98a3b3;
        --line: #232b38;
        --accent: #7aa7ff;
        --accent-2: #a78bfa;
        --accent-fg: #0d1017;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);
        --shadow-md: 0 10px 28px rgba(0, 0, 0, .45);
        --shadow-lg: 0 20px 56px rgba(0, 0, 0, .55);
    }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--fg);
    background: var(--bg);
    line-height: 1.65;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
    left: 8px; top: 8px; z-index: 20;
    background: var(--accent); color: var(--accent-fg);
    padding: 8px 12px; border-radius: 8px;
}

/* ---- Ust bar: yapiskan + bulanik zemin ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 20px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--line);
    background: var(--bg);   /* color-mix desteklenmezse yapiskan baslik saydam kalmasin */
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
}
@supports not (backdrop-filter: blur(1px)) {
    .site-header { background: var(--bg); }
}
.site-header > * { max-width: var(--maxw-wide); }

.logo {
    display: inline-flex; align-items: center; gap: 9px;
    font-weight: 700; letter-spacing: -.01em;
    text-decoration: none; color: var(--fg);
    transition: opacity .2s var(--ease);
}
.logo:hover { opacity: .75; }
.logo img { border-radius: 8px; box-shadow: var(--shadow-sm); }

.sitenav, .langbar { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .93rem; }
.sitenav { margin-right: auto; }
.sitenav a, .langbar a {
    text-decoration: none;
    color: var(--fg-muted);
    padding: 3px 0;
    border-bottom: 2px solid transparent;
    transition: color .18s var(--ease), border-color .18s var(--ease);
}
.sitenav a:hover, .langbar a:hover { color: var(--fg); border-bottom-color: var(--accent); }
.langbar { gap: 4px 11px; font-size: .85rem; }
.lang-current, .nav-current { color: var(--fg); font-weight: 600; }
.langbar.wrap { margin-top: 22px; gap: 8px 16px; }

/* ---- Govde ---- */
main { margin: 0 auto; padding: 36px 20px 72px; }
main.prose { max-width: var(--maxw); }
main.wide { max-width: var(--maxw-wide); }

h1 { font-size: clamp(1.7rem, 4.4vw, 2.1rem); line-height: 1.2; letter-spacing: -.02em; margin: 0 0 10px; }
h2 { font-size: clamp(1.2rem, 2.6vw, 1.45rem); letter-spacing: -.01em; margin-top: 2.4em; }
main.prose h2 { border-bottom: 1px solid var(--line); padding-bottom: 6px; }
h3 { font-size: 1.07rem; margin-top: 1.5em; }
ul, ol { padding-left: 1.25em; }
li { margin-bottom: 6px; }

.muted { color: var(--fg-muted); font-size: .93rem; }
.small { font-size: .85rem; }

.note {
    background: var(--bg-soft);
    border-left: 3px solid var(--accent);
    padding: 13px 16px;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: .94rem;
}

.translation-notice {
    background: var(--bg-soft);
    border: 1px dashed var(--line);
    padding: 11px 15px;
    border-radius: var(--radius);
    font-size: .9rem;
    color: var(--fg-muted);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    text-align: center;
    padding: 56px 0 20px;
}
.hero::before {
    /* yumusak isik lekesi — sade kalsin diye cok dusuk yogunluk */
    content: "";
    position: absolute;
    inset: -80px -10% auto;
    height: 340px;
    background:
        radial-gradient(60% 70% at 30% 30%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%),
        radial-gradient(55% 65% at 72% 20%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 70%);
    filter: blur(6px);
    z-index: -1;
    pointer-events: none;
}
.hero h1 { font-size: clamp(2rem, 6vw, 3rem); }
.lede {
    font-size: clamp(1.02rem, 2.2vw, 1.16rem);
    color: var(--fg-muted);
    max-width: 640px;
    margin: 14px auto 26px;
}
.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: var(--accent-fg);
    text-decoration: none;
    font-weight: 650;
    padding: 13px 30px;
    border-radius: 999px;
    box-shadow: var(--shadow-md);
    transition: transform .22s var(--ease), box-shadow .22s var(--ease), filter .22s var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); filter: brightness(1.06); }
.btn:active { transform: translateY(0); }
.cta { margin: 0 0 8px; }

section + section { margin-top: 68px; }

/* ---- Ozellik kartlari ---- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
    gap: 20px;
}
.feature {
    background: var(--bg-elev);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
    transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
}
.feature h3 { margin-top: 0; font-size: 1.1rem; }
.feature ul { margin-bottom: 0; }
.feature li { color: var(--fg-muted); }

/* ---- Ekran goruntuleri ---- */
.screen-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(172px, 1fr));
    gap: 26px 22px;
}
.screen { margin: 0; text-align: center; }
.phone {
    border: 1px solid var(--line);
    background: linear-gradient(160deg, var(--bg-soft), var(--bg-elev));
    border-radius: 26px;
    padding: 7px;
    aspect-ratio: 540 / 1075;   /* kirpilmis gorsel orani — kirpma olmasin */
    display: flex;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.screen:hover .phone { transform: translateY(-6px) scale(1.015); box-shadow: var(--shadow-lg); }
.phone img {
    width: 100%; height: 100%;
    object-fit: cover;
    border-radius: 20px;
    display: block;
}
/* genis ekranda hafif kademeli yerlesim — dizi durgun gorunmesin */
@media (min-width: 900px) {
    .screen:nth-child(even) { transform: translateY(18px); }
}
.screen figcaption {
    margin-top: 12px;
    font-size: .88rem;
    color: var(--fg-muted);
}

/* ---- Diller / Premium ---- */
.langs, .premium {
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
}
.langs h2, .premium h2 { margin-top: 0; }

/* ---- SSS ---- */
.faq details {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 10px;
    background: var(--bg-elev);
    transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.faq details[open] { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); box-shadow: var(--shadow-sm); }
.faq summary {
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    align-items: center;
    gap: 10px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
    content: "+";
    flex: 0 0 auto;
    width: 22px; height: 22px;
    display: grid; place-items: center;
    border-radius: 50%;
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    color: var(--accent);
    font-weight: 700;
    transition: transform .25s var(--ease);
}
.faq details[open] summary::before { content: "−"; transform: rotate(180deg); }
.faq details > div { padding-top: 8px; color: var(--fg-muted); }

/* ---- Altbilgi ---- */
.site-footer {
    border-top: 1px solid var(--line);
    padding: 32px 20px 52px;
    max-width: var(--maxw-wide);
    margin: 0 auto;
    text-align: center;
}
.site-footer .brand { font-weight: 700; margin: 0 0 10px; letter-spacing: -.01em; }
.site-footer nav {
    display: flex; flex-wrap: wrap; justify-content: center;
    gap: 6px 18px; font-size: .92rem; margin-bottom: 12px;
}
.site-footer nav a { color: var(--fg-muted); text-decoration: none; }
.site-footer nav a:hover { color: var(--accent); text-decoration: underline; }
.site-footer p { margin: 4px 0; }

/* ---- Hareket ---- */
@media (prefers-reduced-motion: no-preference) {
    .hero > * {
        animation: rise .6s var(--ease) both;
    }
    .hero h1 { animation-delay: .04s; }
    .hero .lede { animation-delay: .12s; }
    .hero .cta { animation-delay: .2s; }
    .hero .small { animation-delay: .26s; }

    /* Kaydirmaya bagli belirme. Desteklemeyen tarayicida hicbir sey olmaz,
       icerik normal gorunur (JS yok, bozulma yok). */
    @supports (animation-timeline: view()) {
        .feature, .screen, .langs, .premium, .faq details, .features > h2, .screens > h2 {
            animation: rise .7s var(--ease) both;
            animation-timeline: view();
            animation-range: entry 0% entry 55%;
        }
    }
}

@keyframes rise {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { animation: none !important; transition: none !important; }
    .screen:nth-child(even) { transform: none; }
}

@media (max-width: 560px) {
    .hero { padding-top: 36px; }
    .site-header { gap: 8px 14px; padding: 12px 16px; }
    section + section { margin-top: 52px; }
    .langs, .premium { padding: 18px 18px; }
}