/* ============================================
   LEIBNIZ DETERMINANT — detsignper.org
   ============================================ */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --koyu: #1a1a2e;
    --orta: #16213e;
    --acik: #0f3460;
    --vurgu: #e94560;
    --altin: #c4a35a;
    --kagit: #f8f6f0;
    --yazi: #2b2b2b;
    --yazi-acik: #5a5a5a;
    --cizgi: #d4d0c8;
}

body {
    font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
    color: var(--yazi);
    background-color: var(--kagit);
    line-height: 1.85;
    padding-bottom: 60px;
}

nav {
    background-color: var(--koyu);
    padding: 14px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}
nav .logo {
    color: var(--altin);
    font-size: 14px;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    text-decoration: none;
    font-weight: bold;
}
nav .links { display: flex; gap: 24px; }
nav .links a {
    color: #a0a8c0;
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.8px;
}
nav .links a:hover, nav .links a.active { color: #fff; }

.hero {
    background: linear-gradient(135deg, var(--koyu) 0%, var(--orta) 50%, var(--acik) 100%);
    color: var(--kagit);
    padding: 80px 5% 65px;
    text-align: center;
}
.hero small {
    display: block;
    font-size: 12px;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--altin);
    margin-bottom: 18px;
}
.hero h1 {
    font-size: clamp(24px, 4vw, 40px);
    font-weight: normal;
    line-height: 1.4;
    max-width: 800px;
    margin: 0 auto 20px;
}
.hero p {
    font-size: 16px;
    color: #a0a8c0;
    max-width: 620px;
    margin: 0 auto;
}

.page-header {
    background: linear-gradient(135deg, var(--koyu) 0%, var(--orta) 100%);
    color: var(--kagit);
    padding: 55px 5% 45px;
    text-align: center;
}
.page-header h1 {
    font-size: clamp(22px, 3.5vw, 34px);
    font-weight: normal;
    margin-bottom: 8px;
}
.page-header p { color: var(--altin); font-size: 15px; }

.content {
    max-width: 780px;
    margin: 0 auto;
    padding: 50px 5%;
}
.content h2 {
    font-size: 24px;
    font-weight: normal;
    color: var(--orta);
    margin: 40px 0 14px;
    border-left: 4px solid var(--vurgu);
    padding-left: 16px;
}
.content h2:first-child { margin-top: 0; }
.content p {
    font-size: 16px;
    margin-bottom: 16px;
    text-align: justify;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 35px auto;
    max-width: 780px;
    padding: 0 5%;
}
.info-box {
    background: #fff;
    border: 1px solid var(--cizgi);
    padding: 24px;
    border-top: 3px solid var(--acik);
}
.info-box strong {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--vurgu);
    margin-bottom: 7px;
}
.info-box span { font-size: 15px; line-height: 1.6; }

.divider {
    width: 50px;
    height: 3px;
    background: var(--vurgu);
    margin: 45px auto;
}

footer {
    background-color: var(--koyu);
    color: #6a7090;
    text-align: center;
    padding: 28px 5%;
    font-size: 13px;
}
footer a { color: var(--altin); text-decoration: none; }
footer a:hover { color: #fff; }

.donation-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: linear-gradient(90deg, var(--vurgu) 0%, #c0392b 100%);
    text-align: center;
    padding: 12px 5%;
}
.donation-banner a {
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 1.5px;
    font-weight: bold;
}
.donation-banner a:hover { text-decoration: underline; }

.donation-intro {
    max-width: 700px;
    margin: 0 auto;
    padding: 40px 5% 20px;
    text-align: center;
}
.donation-intro p {
    font-size: 16px;
    color: var(--yazi-acik);
    line-height: 1.8;
}
.donation-methods {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 5% 50px;
}
.donation-card {
    background: #fff;
    border: 1px solid var(--cizgi);
    padding: 28px 30px;
    margin-bottom: 20px;
    border-left: 4px solid var(--acik);
}
.donation-card.crypto { border-left-color: var(--altin); }
.donation-card.iban { border-left-color: var(--vurgu); }

.donation-card h3 {
    font-size: 18px;
    font-weight: normal;
    color: var(--orta);
    margin-bottom: 8px;
}
.donation-card p {
    font-size: 14px;
    color: var(--yazi-acik);
    margin-bottom: 12px;
    line-height: 1.7;
}
.donation-card a.btn {
    display: inline-block;
    background: var(--acik);
    color: #fff;
    padding: 10px 24px;
    text-decoration: none;
    font-size: 13px;
    letter-spacing: 1px;
}
.donation-card a.btn:hover { background: var(--koyu); }

.donation-card .address {
    background: var(--kagit);
    border: 1px solid var(--cizgi);
    padding: 10px 14px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 12px;
    word-break: break-all;
    margin-bottom: 8px;
    line-height: 1.5;
}
.donation-card .iban-row {
    background: var(--kagit);
    border: 1px solid var(--cizgi);
    padding: 14px 18px;
    margin-bottom: 10px;
}
.donation-card .iban-row strong {
    display: block;
    font-size: 14px;
    color: var(--orta);
    margin-bottom: 3px;
}
.donation-card .iban-row code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    color: var(--yazi-acik);
    letter-spacing: 1px;
}

@media (max-width: 650px) {
    nav { flex-direction: column; gap: 10px; padding: 12px 4%; }
    nav .links { gap: 16px; flex-wrap: wrap; justify-content: center; }
    .info-grid { grid-template-columns: 1fr; }
    .hero { padding: 55px 5% 45px; }
    body { padding-bottom: 52px; }
    .donation-banner { padding: 10px 4%; }
    .donation-banner a { font-size: 12px; }
    .donation-card { padding: 20px 18px; }
}