:root {
    --ink: #0f172a;
    --ink-2: #334155;
    --muted: #64748b;
    --line: #e2e8f0;
    --bg: #f3f5fa;
    --surface: #ffffff;
    --brand: #2563eb;
    --brand-2: #1d4ed8;
    --brand-soft: #eff4ff;
    --ok: #16a34a;
    --err: #dc2626;
    --radius: 20px;
    --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 12px 40px -12px rgba(15, 23, 42, .18);
    --bs-body-font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
}

html, body { height: 100%; }

body {
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(1200px 500px at 100% -10%, #e0e9ff 0%, transparent 60%),
        radial-gradient(900px 400px at -10% 110%, #e8eefc 0%, transparent 60%),
        var(--bg);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
}

.mono { font-family: 'JetBrains Mono', ui-monospace, monospace; letter-spacing: .04em; }

/* ---------- Üst bar / alt bilgi ---------- */
.topbar {
    background: rgba(255, 255, 255, .8);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--line);
    padding: .75rem 0;
    position: sticky;
    top: 0;
    z-index: 10;
}
.brand img { height: 36px; width: auto; display: block; }
.brand span { font-weight: 700; color: var(--ink); text-decoration: none; }
.brand { text-decoration: none; }
.secure-badge {
    font-size: .8rem;
    font-weight: 500;
    color: var(--ok);
    background: #ecfdf3;
    border: 1px solid #c9f0d6;
    padding: .35rem .7rem;
    border-radius: 999px;
    white-space: nowrap;
}
.footer {
    text-align: center;
    color: var(--muted);
    font-size: .85rem;
    padding: 1.5rem 1rem 2rem;
}

/* ---------- Ödeme kabuğu ---------- */
.pay-shell {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    max-width: 1040px;
    margin: 0 auto;
}

.pay-aside {
    background: linear-gradient(160deg, #0b1220 0%, #16213d 55%, #1e3a8a 130%);
    color: #e2e8f0;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.pay-panel { padding: 2.5rem 2.5rem 2rem; }

.pay-title { font-size: 1.6rem; font-weight: 700; margin: 0 0 .25rem; letter-spacing: -.02em; }
.pay-sub { color: var(--muted); margin-bottom: 1.75rem; }

/* ---------- 3D kart ---------- */
.card3d { perspective: 1200px; width: 100%; max-width: 360px; aspect-ratio: 1.586; margin: 0 auto; }
.card3d-inner {
    position: relative; width: 100%; height: 100%;
    transition: transform .7s cubic-bezier(.2, .8, .2, 1);
    transform-style: preserve-3d;
}
.card3d.flipped .card3d-inner { transform: rotateY(180deg); }
.card3d-face {
    position: absolute; inset: 0;
    border-radius: 16px;
    backface-visibility: hidden;
    padding: 1.4rem 1.5rem;
    display: flex; flex-direction: column; justify-content: space-between;
    color: #fff;
    box-shadow: 0 20px 40px -12px rgba(0, 0, 0, .6);
    overflow: hidden;
}
.card3d-front {
    background:
        radial-gradient(circle at 85% 0%, rgba(255, 255, 255, .25), transparent 45%),
        linear-gradient(135deg, #3b82f6 0%, #6d28d9 100%);
    transition: background .4s;
}
.card3d-front[data-brand="visa"]       { background: radial-gradient(circle at 85% 0%, rgba(255,255,255,.25), transparent 45%), linear-gradient(135deg, #1a1f71, #2b54c7); }
.card3d-front[data-brand="mastercard"] { background: radial-gradient(circle at 85% 0%, rgba(255,255,255,.2), transparent 45%), linear-gradient(135deg, #111827, #3f3f46); }
.card3d-front[data-brand="troy"]       { background: radial-gradient(circle at 85% 0%, rgba(255,255,255,.25), transparent 45%), linear-gradient(135deg, #0f766e, #14b8a6); }
.card3d-front[data-brand="amex"]       { background: radial-gradient(circle at 85% 0%, rgba(255,255,255,.25), transparent 45%), linear-gradient(135deg, #0369a1, #38bdf8); }
.card3d-back { background: linear-gradient(135deg, #1f2937, #0f172a); transform: rotateY(180deg); justify-content: center; padding: 0; }
.chip {
    width: 44px; height: 34px; border-radius: 7px;
    background: linear-gradient(135deg, #fde68a, #d4a017);
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .15);
}
.brand-mark { font-weight: 800; font-style: italic; font-size: 1.25rem; letter-spacing: .02em; opacity: .95; }
.card-num { font-family: 'JetBrains Mono', monospace; font-size: clamp(1.05rem, 2.6vw, 1.35rem); letter-spacing: .12em; }
.card3d small { display: block; font-size: .6rem; text-transform: uppercase; letter-spacing: .12em; opacity: .7; }
.card-meta { font-size: .9rem; font-weight: 600; text-transform: uppercase; max-width: 200px; }
.stripe { height: 44px; background: #000; margin-bottom: 1.2rem; }
.cvc-box {
    margin: 0 1.5rem; background: #f8fafc; color: #0f172a; border-radius: 6px;
    padding: .5rem .8rem; text-align: right; font-family: 'JetBrains Mono', monospace;
}

/* ---------- Özet ---------- */
.summary-row { display: flex; justify-content: space-between; align-items: baseline; padding: .35rem 0; color: #cbd5e1; }
.summary-row strong { font-size: 1.9rem; color: #fff; font-weight: 700; letter-spacing: -.02em; }
.summary hr { border-color: rgba(255, 255, 255, .15); opacity: 1; margin: 1rem 0; }
.trust { list-style: none; padding: 0; margin: 0; font-size: .85rem; color: #94a3b8; display: grid; gap: .5rem; }
.trust i { color: #60a5fa; margin-right: .35rem; }

/* ---------- Form ---------- */
.form-label { font-size: .85rem; font-weight: 600; color: var(--ink-2); margin-bottom: .35rem; }
.form-label .opt { font-weight: 400; color: var(--muted); }
.form-control, .form-select, .input-group-text {
    border-color: var(--line);
    border-radius: 12px;
    padding: .72rem .9rem;
    font-size: 1rem;
}
.form-control:focus, .form-select:focus {
    border-color: var(--brand);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}
.input-group-text { background: #f8fafc; color: var(--muted); font-weight: 600; }
.amount .form-control { font-size: 1.15rem; font-weight: 600; }
.input-icon { position: relative; }
.input-icon > i { position: absolute; left: .95rem; top: 50%; transform: translateY(-50%); color: var(--muted); }
.input-icon > .form-control { padding-left: 2.6rem; }
.input-validation-error { border-color: var(--err) !important; }
.field-error { display: block; color: var(--err); font-size: .8rem; margin-top: .3rem; }
.field-error:empty { display: none; }

/* ---------- Taksit ---------- */
.installments { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: .6rem; }
.inst { position: relative; cursor: pointer; margin: 0; }
.inst input { position: absolute; opacity: 0; pointer-events: none; }
.inst-body {
    display: flex; flex-direction: column; gap: .15rem;
    border: 1.5px solid var(--line); border-radius: 12px;
    padding: .65rem .8rem;
    transition: border-color .15s, background .15s, box-shadow .15s;
}
.inst:hover .inst-body { border-color: #bfd0f7; }
.inst input:checked + .inst-body { border-color: var(--brand); background: var(--brand-soft); box-shadow: 0 0 0 3px rgba(37, 99, 235, .1); }
.inst input:focus-visible + .inst-body { outline: 2px solid var(--brand); outline-offset: 2px; }
.inst-title { font-size: .82rem; font-weight: 600; color: var(--ink-2); }
.inst-amount { font-size: .95rem; font-weight: 700; color: var(--ink); }

/* ---------- Buton ---------- */
.btn-pay {
    width: 100%;
    display: flex; align-items: center; justify-content: center; gap: .55rem;
    border: 0; border-radius: 14px;
    padding: 1rem;
    font-size: 1.05rem; font-weight: 700;
    color: #fff;
    background: linear-gradient(180deg, #3b82f6, var(--brand-2));
    box-shadow: 0 10px 24px -10px rgba(37, 99, 235, .8);
    transition: transform .15s, box-shadow .15s, opacity .15s;
}
.btn-pay:hover { transform: translateY(-1px); box-shadow: 0 14px 28px -10px rgba(37, 99, 235, .9); }
.btn-pay:disabled { opacity: .75; transform: none; cursor: progress; }

/* ---------- Sonuç / dekont ---------- */
.result-shell { max-width: 620px; margin: 0 auto; }
.result-head {
    text-align: center; background: var(--surface); border-radius: var(--radius);
    box-shadow: var(--shadow); padding: 2.5rem 2rem 2rem; margin-bottom: 1.25rem;
}
.result-head h1 { font-size: 1.5rem; font-weight: 700; margin: 1rem 0 .4rem; letter-spacing: -.02em; }
.result-head p { color: var(--muted); margin: 0; }
.result-icon {
    width: 68px; height: 68px; border-radius: 50%; margin: 0 auto;
    display: grid; place-items: center; font-size: 2rem; color: #fff;
}
.result-head.success .result-icon { background: var(--ok); box-shadow: 0 0 0 10px #dcfce7; }
.result-head.error .result-icon { background: var(--err); box-shadow: 0 0 0 10px #fee2e2; }

.receipt { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 2rem; }
.receipt-head { display: flex; align-items: center; gap: 1rem; padding-bottom: 1.25rem; border-bottom: 1px dashed var(--line); }
.receipt-head img { max-height: 44px; width: auto; }
.receipt-title { font-weight: 700; font-size: 1.1rem; }
.receipt-sub { color: var(--muted); font-size: .85rem; }
.receipt-amount { display: flex; justify-content: space-between; align-items: baseline; padding: 1.25rem 0; border-bottom: 1px dashed var(--line); }
.receipt-amount span { color: var(--muted); }
.receipt-amount strong { font-size: 1.8rem; color: var(--ok); letter-spacing: -.02em; }
.receipt-list { display: grid; grid-template-columns: max-content 1fr; gap: .7rem 1.5rem; margin: 1.25rem 0; }
.receipt-list dt { color: var(--muted); font-weight: 500; }
.receipt-list dd { margin: 0; text-align: right; font-weight: 600; word-break: break-all; }
.receipt-foot { color: var(--muted); font-size: .8rem; text-align: center; margin: 1rem 0 0; }
.pill-ok { background: #dcfce7; color: #166534; padding: .15rem .6rem; border-radius: 999px; font-size: .85rem; }

.result-actions { display: flex; gap: .75rem; justify-content: center; margin-top: 1.25rem; flex-wrap: wrap; }
.result-actions .btn { border-radius: 12px; padding: .7rem 1.3rem; font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 991.98px) {
    .pay-shell { grid-template-columns: 1fr; }
    .pay-aside { padding: 1.75rem 1.25rem; gap: 1.25rem; }
    .trust { display: none; }
    .summary hr { display: none; }
    .pay-panel { padding: 1.75rem 1.25rem; }
}
@media (max-width: 575.98px) {
    .secure-badge { display: none; }
    .container { padding-left: 16px; padding-right: 16px; }
    .receipt { padding: 1.25rem; }
}

/* ---------- Yazdırma: sadece dekont ---------- */
@media print {
    body { background: #fff; }
    .topbar, .footer, .no-print { display: none !important; }
    .receipt { box-shadow: none; border: 1px solid #ddd; }
}