/* =========================================================
   SİVAS CUMHURİYET ÜNİVERSİTESİ e-YERLEŞKE
   Modern arayüz stilleri
   ========================================================= */

:root {
    --navy-900: #071633;
    --navy-800: #0b2148;
    --navy-700: #12306a;
    --navy-600: #1b3f86;
    --red-600: #c8102e;
    --red-500: #e0203f;
    --gold-500: #e9b949;
    --ink-900: #0f172a;
    --ink-700: #334155;
    --ink-500: #64748b;
    --ink-300: #cbd5e1;
    --ink-100: #e9edf3;
    --paper: #f5f7fb;
    --white: #ffffff;

    --c-blue: #1f5fe0;
    --c-yellow: #e39a12;
    --c-green: #1c9a5b;
    --c-violet: #7b3fe4;

    --radius: 14px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .08);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, .10);
    --shadow-lg: 0 24px 48px -12px rgba(7, 22, 51, .35);

    --font-head: 'Manrope', 'Segoe UI', Arial, sans-serif;
    --font-body: 'Nunito Sans', 'Segoe UI', Arial, sans-serif;
}

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

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

body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--ink-900);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { font-family: var(--font-head); margin: 0; line-height: 1.15; }

.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero {
    position: relative;
    min-height: 0;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--navy-900);
    color: #fff;
    padding: 28px 0 56px;
}
.hero-bg {
    position: absolute;
    inset: -4%;
    background: url('../images/kampus-bg.jpg') center 40% / cover no-repeat;
    transform: scale(1);
    transform-origin: 50% 45%;
    animation: heroZoom 28s ease-in-out infinite alternate;
    will-change: transform;
}
@keyframes heroZoom {
    from { transform: scale(1); }
    to   { transform: scale(1.22); }
}
.hero-shade {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(900px 500px at 12% 20%, rgba(200,16,46,.30), transparent 60%),
        linear-gradient(180deg, rgba(7,22,51,.72) 0%, rgba(7,22,51,.62) 45%, rgba(7,22,51,.94) 100%);
}
.hero .container { position: relative; z-index: 2; }

.hero-inner {
    max-width: none;
}
.hero-logo {
    width: 76px; height: 76px;
    border-radius: 50%;
    background: #fff;
    padding: 5px;
    box-shadow: 0 0 0 6px rgba(255,255,255,.08), 0 14px 30px rgba(0,0,0,.35);
    margin-bottom: 18px;
}
.hero-kicker {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-head);
    font-weight: 400;
    font-size: clamp(22px, 2.2vw, 30px);
    letter-spacing: .04em;
    color: #fff;
    margin-bottom: 10px;
}
.hero-kicker::before {
    content: '';
    width: 36px; height: 3px;
    background: var(--red-500);
    border-radius: 2px;
}
.hero-kicker em {
    font-style: normal;
    font-weight: 700;
    color: var(--gold-500);
}
.hero h1 {
    font-size: clamp(17px, 3.9vw, 54px);
    font-weight: 800;
    letter-spacing: -.02em;
    line-height: 1.02;
    white-space: nowrap;
}
.hero-edge {
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    z-index: 3;
    line-height: 0;
}
.hero-edge svg { width: 100%; height: 56px; display: block; }

/* ---------------------------------------------------------
   Sistemler
   --------------------------------------------------------- */
.systems {
    padding: 40px 0 80px;
}
.sys-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.sys-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: #fff;
    border-radius: var(--radius);
    padding: 26px 24px 22px;
    border: 1px solid rgba(15,23,42,.06);
    box-shadow: var(--shadow-sm);
    min-height: 200px;
    overflow: hidden;
    transition: transform .25s cubic-bezier(.2,.8,.2,1), box-shadow .25s, border-color .25s;
    opacity: 0;
    transform: translateY(16px);
}
.sys-card.in { opacity: 1; transform: translateY(0); }
.sys-card::before {
    content: '';
    position: absolute;
    left: 0; right: 0; top: 0;
    height: 4px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .3s cubic-bezier(.2,.8,.2,1);
}
.sys-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 22px 40px -14px rgba(7,22,51,.28);
    border-color: transparent;
}
.sys-card:hover::before { transform: scaleX(1); }

.sys-icon {
    width: 54px; height: 54px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    font-size: 22px;
    color: #fff;
    background: var(--accent);
    box-shadow: 0 8px 18px -6px var(--accent);
}
.sys-card h3 {
    font-size: 17px;
    font-weight: 800;
    color: var(--navy-900);
    letter-spacing: -.01em;
}
.sys-card p {
    margin: 0;
    font-size: 14px;
    color: var(--ink-500);
    flex: 1;
}
.sys-card .go {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-head);
    font-size: 13px;
    font-weight: 700;
    color: var(--accent);
    margin-top: auto;
}
.sys-card .go i { transition: transform .2s; }
.sys-card:hover .go i { transform: translateX(4px); }

.sys-card.bg-blue   { --accent: var(--c-blue); }
.sys-card.bg-yellow { --accent: var(--c-yellow); }
.sys-card.bg-green  { --accent: var(--c-green); }
.sys-card.bg-violet { --accent: var(--c-violet); }

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
    background: #fff;
    border-top: 1px solid var(--ink-100);
    padding: 40px 0 28px;
}
.site-footer .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 14px;
}
.footer-brand img { width: 52px; height: 52px; }
.footer-brand strong {
    display: block;
    font-family: var(--font-head);
    font-weight: 800;
    color: var(--navy-900);
}
.footer-brand span { font-size: 13px; color: var(--ink-500); }
.social {
    display: flex;
    gap: 10px;
}
.social a {
    width: 42px; height: 42px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    color: var(--ink-700);
    background: var(--paper);
    border: 1px solid var(--ink-100);
    font-size: 16px;
    transition: all .2s;
}
.social a:hover { color: #fff; transform: translateY(-3px); }
.social a.facebook:hover  { background: #1877f2; border-color: #1877f2; }
.social a.twitter:hover   { background: #0f1419; border-color: #0f1419; }
.social a.instagram:hover { background: #d62976; border-color: #d62976; }
.social a.youtube:hover   { background: #ff0000; border-color: #ff0000; }
.copyright {
    width: 100%;
    margin-top: 22px;
    padding-top: 18px;
    border-top: 1px solid var(--ink-100);
    font-size: 13px;
    color: var(--ink-500);
    display: flex;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

/* ---------------------------------------------------------
   Yukarı Çık
   --------------------------------------------------------- */
.to-top {
    position: fixed;
    right: 22px; bottom: 22px;
    width: 46px; height: 46px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: #fff;
    background: var(--navy-900);
    box-shadow: var(--shadow-md);
    opacity: 0;
    pointer-events: none;
    transform: translateY(12px);
    transition: opacity .25s, transform .25s;
    z-index: 50;
}
.to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ---------------------------------------------------------
   Duyarlılık
   --------------------------------------------------------- */
@media (max-width: 1100px) {
    .sys-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
    .container { padding: 0 16px; }
    .hero { padding: 22px 0 46px; min-height: 0; }
    .hero-logo { width: 64px; height: 64px; }
    .hero-edge svg { height: 36px; }
    .sys-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .sys-card { padding: 20px 18px 18px; min-height: 0; }
    .systems { padding: 32px 0 60px; }
}
@media (max-width: 480px) {
    .sys-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    .hero-bg { animation: none; transform: scale(1.08); }
    .sys-card { transition: none; opacity: 1; transform: none; }
}