* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: #f0f2f5; color: #222; min-height: 100vh;
    display: flex; flex-direction: column;
}
header { background: #1e88e5; padding: 16px 20px; }
.logo { color: #fff; text-decoration: none; font-size: 22px; font-weight: 700; }
main { flex: 1; width: 100%; max-width: 640px; margin: 40px auto; padding: 0 16px; }
footer { text-align: center; padding: 20px; color: #888; font-size: 13px; }

.kart { background: #fff; border-radius: 12px; padding: 24px; box-shadow: 0 2px 12px rgba(0,0,0,.08); }
.alan {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    border: 3px dashed #bcd; border-radius: 12px; padding: 60px 20px;
    cursor: pointer; text-align: center; transition: .2s; color: #555;
}
.alan:hover, .alan.ustunde { border-color: #1e88e5; background: #eef6ff; }
.alan.yukleniyor { opacity: .5; pointer-events: none; }
.alan .ikon { font-size: 48px; }
.alan strong { font-size: 20px; color: #222; }
.alan small { color: #999; margin-top: 8px; }
#durum { text-align: center; margin-top: 14px; font-weight: 600; color: #1e88e5; }

.hata { background: #fdecea; color: #c62828; padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }

.onizleme { display: block; max-width: 100%; max-height: 400px; margin: 0 auto 20px; border-radius: 8px; }
.kart label { display: block; font-size: 13px; font-weight: 600; color: #666; margin: 12px 0 4px; }
.kopya { display: flex; }
.kopya input {
    flex: 1; min-width: 0; padding: 10px; border: 1px solid #ccd; border-right: 0;
    border-radius: 6px 0 0 6px; font-size: 14px; background: #fafafa;
}
.kopya button {
    padding: 0 16px; border: 0; background: #1e88e5; color: #fff;
    border-radius: 0 6px 6px 0; cursor: pointer; font-weight: 600; white-space: nowrap;
}
.kopya button:hover { background: #1565c0; }
.btn {
    display: block; text-align: center; margin-top: 24px; padding: 12px;
    background: #43a047; color: #fff; text-decoration: none; border-radius: 8px; font-weight: 600;
}
.btn:hover { background: #2e7d32; }