/* Stella Plus — standalone ödeme sayfası
   Referans: stellaplus.tr (minimal, kurumsal, beyaz/koyu gri) */

:root {
    --sp-bg:           #fafafa;
    --sp-bg-alt:       #ffffff;
    --sp-text:         #1a1a1a;
    --sp-text-soft:    #525252;
    --sp-text-muted:   #8a8a8a;
    --sp-border:       #e5e5e5;
    --sp-border-soft:  #f0f0f0;
    --sp-primary:      #111111;
    --sp-primary-hover:#2a2a2a;
    --sp-accent:       #c79a3a;
    --sp-success:      #2e7d32;
    --sp-success-bg:   #f0f9f0;
    --sp-error:        #c62828;
    --sp-error-bg:     #fdecea;
    --sp-radius:       10px;
    --sp-radius-sm:    6px;
    --sp-shadow:       0 2px 12px rgba(0,0,0,0.04);
    --sp-shadow-lg:    0 6px 32px rgba(0,0,0,0.08);
    --sp-font:         -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --sp-container:    1100px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--sp-bg);
    color: var(--sp-text);
    font-family: var(--sp-font);
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

img { max-width: 100%; height: auto; }

a { color: var(--sp-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.sp-container {
    max-width: var(--sp-container);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header ---------------------------------------------------------------- */
.sp-header {
    background: var(--sp-bg-alt);
    border-bottom: 1px solid var(--sp-border);
    position: sticky;
    top: 0;
    z-index: 20;
}
.sp-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.sp-logo {
    font-weight: 800;
    font-size: 20px;
    letter-spacing: 0.5px;
    color: var(--sp-text);
    text-decoration: none;
}
.sp-nav {
    display: flex;
    gap: 22px;
    align-items: center;
}
.sp-nav a {
    font-size: 14px;
    color: var(--sp-text-soft);
    text-decoration: none;
}
.sp-nav a:hover { color: var(--sp-primary); }
.sp-nav__logout {
    padding: 6px 12px;
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius-sm);
}

/* Hero ------------------------------------------------------------------ */
.sp-main { padding-bottom: 80px; }

.sp-hero {
    padding: 60px 0 40px;
    background: linear-gradient(180deg, var(--sp-bg-alt) 0%, var(--sp-bg) 100%);
    border-bottom: 1px solid var(--sp-border-soft);
    text-align: center;
}
.sp-kicker {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--sp-accent);
    margin-bottom: 12px;
}
.sp-hero__title {
    font-size: clamp(28px, 4vw, 44px);
    line-height: 1.15;
    font-weight: 800;
    margin: 0 0 14px;
    letter-spacing: -0.5px;
}
.sp-hero__subtitle {
    font-size: 17px;
    color: var(--sp-text-soft);
    max-width: 620px;
    margin: 0 auto 22px;
}
.sp-trust {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 6px 10px;
    padding: 8px 16px;
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: 999px;
    font-size: 13px;
    color: var(--sp-text-soft);
    max-width: 100%;
}
.sp-trust__dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--sp-border);
}

/* Features -------------------------------------------------------------- */
.sp-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    padding-top: 36px;
    padding-bottom: 36px;
}
.sp-feature {
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius);
    padding: 22px;
}
.sp-feature__icon {
    font-size: 26px;
    margin-bottom: 8px;
}
.sp-feature h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 6px;
}
.sp-feature p {
    font-size: 14px;
    color: var(--sp-text-soft);
    margin: 0;
    line-height: 1.5;
}

/* Panel (auth veya payment) ----------------------------------------------*/
.sp-panel { margin: 16px auto 40px; }

.sp-card {
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius);
    padding: 32px;
    box-shadow: var(--sp-shadow);
}
.sp-card--center {
    text-align: center;
    max-width: 520px;
    margin: 0 auto;
}
.sp-card__icon {
    font-size: 48px;
    margin-bottom: 8px;
}

/* Auth box */
.sp-auth {
    max-width: 520px;
    margin: 0 auto;
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius);
    box-shadow: var(--sp-shadow);
    overflow: hidden;
}
.sp-auth__tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--sp-border);
    background: var(--sp-bg);
}
.sp-tab {
    border: 0;
    background: transparent;
    padding: 16px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    color: var(--sp-text-muted);
    border-bottom: 2px solid transparent;
    transition: color .15s, border-color .15s;
}
.sp-tab:hover { color: var(--sp-text); }
.sp-tab.is-active {
    color: var(--sp-primary);
    border-bottom-color: var(--sp-primary);
    background: var(--sp-bg-alt);
}
.sp-tab-content {
    display: none;
    padding: 28px;
}
.sp-tab-content.is-active { display: block; }

/* Payment box */
.sp-payment {
    max-width: 640px;
    margin: 0 auto;
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius);
    padding: 28px;
    box-shadow: var(--sp-shadow);
}
.sp-payment__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 18px;
    gap: 12px;
}
.sp-payment__header h2 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
}
.sp-payment__user {
    text-align: right;
    font-size: 13px;
    color: var(--sp-text-soft);
}
.sp-payment__user span { display: block; font-weight: 600; color: var(--sp-text); }
.sp-payment__user small { font-size: 12px; color: var(--sp-text-muted); }
.sp-payment__accept {
    list-style: none;
    padding: 0;
    margin: 18px 0 0;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}
.sp-payment__accept li {
    padding: 4px 10px;
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius-sm);
    font-size: 12px;
    color: var(--sp-text-soft);
    background: var(--sp-bg);
}

/* Forms ---------------------------------------------------------------- */
.sp-form { display: flex; flex-direction: column; gap: 14px; }

.sp-field { display: flex; flex-direction: column; gap: 6px; }
.sp-field__label {
    font-size: 13px;
    font-weight: 600;
    color: var(--sp-text-soft);
}
.sp-field input[type="text"],
.sp-field input[type="email"],
.sp-field input[type="tel"],
.sp-field input[type="password"],
.sp-field textarea {
    padding: 11px 14px;
    font-size: 15px;
    font-family: inherit;
    color: var(--sp-text);
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius-sm);
    outline: none;
    transition: border-color .15s, box-shadow .15s;
    width: 100%;
}
.sp-field input:focus,
.sp-field textarea:focus {
    border-color: var(--sp-primary);
    box-shadow: 0 0 0 3px rgba(17,17,17,0.08);
}
.sp-field textarea { resize: vertical; min-height: 64px; }

.sp-field--inline {
    flex-direction: row;
    align-items: center;
    gap: 8px;
}
.sp-field--inline input { width: auto; }
.sp-field--inline span { font-size: 14px; color: var(--sp-text-soft); }

.sp-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.sp-field--amount .sp-amount-wrap {
    position: relative;
    display: flex;
    align-items: stretch;
}
.sp-amount-currency {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    background: var(--sp-bg);
    border: 1px solid var(--sp-border);
    border-right: 0;
    border-top-left-radius: var(--sp-radius-sm);
    border-bottom-left-radius: var(--sp-radius-sm);
    font-weight: 700;
    font-size: 18px;
    color: var(--sp-text-soft);
}
.sp-amount-wrap input {
    flex: 1;
    font-size: 20px !important;
    font-weight: 600;
    border-top-left-radius: 0 !important;
    border-bottom-left-radius: 0 !important;
    padding: 11px 14px !important;
}

.sp-collapsible {
    margin-top: 2px;
    border: 1px solid var(--sp-border-soft);
    border-radius: var(--sp-radius-sm);
    padding: 0;
    background: var(--sp-bg);
}
.sp-collapsible > summary {
    cursor: pointer;
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
    color: var(--sp-text-soft);
    user-select: none;
    list-style: none;
}
.sp-collapsible > summary::-webkit-details-marker { display: none; }
.sp-collapsible > summary::before {
    content: "+";
    display: inline-block;
    margin-right: 8px;
    font-weight: 700;
    transition: transform .15s;
}
.sp-collapsible[open] > summary::before {
    content: "−";
}
.sp-collapsible > :not(summary) {
    padding: 14px;
    border-top: 1px solid var(--sp-border-soft);
}

/* Buttons --------------------------------------------------------------- */
.sp-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    border: 1px solid transparent;
    border-radius: var(--sp-radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: background .15s, border-color .15s, color .15s, transform .05s;
    line-height: 1.2;
}
.sp-btn:hover { text-decoration: none; }
.sp-btn:active { transform: translateY(1px); }

.sp-btn--primary {
    background: var(--sp-primary);
    color: #fff;
    border-color: var(--sp-primary);
}
.sp-btn--primary:hover { background: var(--sp-primary-hover); border-color: var(--sp-primary-hover); color: #fff; }

.sp-btn--ghost {
    background: transparent;
    color: var(--sp-text);
    border-color: var(--sp-border);
}
.sp-btn--ghost:hover { background: var(--sp-bg); }

.sp-btn--large { padding: 16px 28px; font-size: 16px; }
.sp-btn__hint {
    font-size: 11px;
    font-weight: 400;
    color: rgba(255,255,255,0.7);
    margin-top: 3px;
}
.sp-btn--primary:disabled { opacity: 0.65; cursor: not-allowed; }

/* Messages ------------------------------------------------------------- */
.sp-msg {
    padding: 12px 14px;
    border-radius: var(--sp-radius-sm);
    font-size: 14px;
    margin-bottom: 14px;
    line-height: 1.4;
}
.sp-msg--success { background: var(--sp-success-bg); color: var(--sp-success); border: 1px solid rgba(46,125,50,0.2); }
.sp-msg--error   { background: var(--sp-error-bg);   color: var(--sp-error);   border: 1px solid rgba(198,40,40,0.2); }

.sp-fineprint {
    margin: 2px 0 0;
    font-size: 12px;
    color: var(--sp-text-muted);
}

/* FAQ ------------------------------------------------------------------- */
.sp-faq { padding: 32px 20px; }
.sp-faq h2 {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 20px;
}
.sp-faq__item {
    background: var(--sp-bg-alt);
    border: 1px solid var(--sp-border);
    border-radius: var(--sp-radius-sm);
    margin-bottom: 10px;
    padding: 0;
}
.sp-faq__item > summary {
    cursor: pointer;
    padding: 14px 18px;
    font-weight: 600;
    font-size: 15px;
    list-style: none;
    position: relative;
    padding-right: 40px;
}
.sp-faq__item > summary::-webkit-details-marker { display: none; }
.sp-faq__item > summary::after {
    content: "+";
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    font-weight: 400;
    color: var(--sp-text-muted);
}
.sp-faq__item[open] > summary::after { content: "−"; }
.sp-faq__item > p {
    margin: 0;
    padding: 0 18px 14px;
    color: var(--sp-text-soft);
    font-size: 14px;
}

/* Result --------------------------------------------------------------- */
.sp-result { margin-top: 40px; max-width: 560px; }
.sp-result__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 14px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    font-size: 34px;
    color: #fff;
}
.sp-result--success .sp-result__icon { background: var(--sp-success); }
.sp-result--fail    .sp-result__icon { background: var(--sp-error); }
.sp-result h1 { margin: 0 0 8px; font-size: 24px; }
.sp-result__msg { color: var(--sp-text-soft); }
.sp-result__details {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 6px 14px;
    max-width: 340px;
    margin: 18px auto;
    text-align: left;
    font-size: 14px;
}
.sp-result__details dt { color: var(--sp-text-muted); }
.sp-result__details dd { margin: 0; font-weight: 600; }
.sp-result__actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 18px;
}

/* Footer --------------------------------------------------------------- */
.sp-footer {
    background: var(--sp-bg-alt);
    border-top: 1px solid var(--sp-border);
    padding: 24px 0;
    margin-top: 60px;
}
.sp-footer__brand {
    display: block;
    margin-bottom: 18px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--sp-border-soft);
}
.sp-footer__logo {
    width: 100%;
    height: auto;
    max-width: 100%;
    display: block;
}
.sp-footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--sp-text-soft);
}
.sp-footer__left {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}
.sp-footer__right { display: flex; gap: 8px; flex-wrap: wrap; }
.sp-badge {
    padding: 4px 10px;
    background: var(--sp-bg);
    border: 1px solid var(--sp-border);
    border-radius: 999px;
    font-size: 12px;
}

/* Responsive ----------------------------------------------------------- */
@media (max-width: 768px) {
    .sp-container { padding: 0 16px; }
    .sp-header__inner { height: auto; min-height: 56px; padding: 10px 0; gap: 12px; flex-wrap: wrap; }
    .sp-logo { font-size: 17px; }
    .sp-nav { gap: 14px; flex-wrap: wrap; }
    .sp-nav a { font-size: 13px; }
}

@media (max-width: 640px) {
    html, body { font-size: 15px; }
    .sp-container { padding: 0 14px; }
    .sp-row { grid-template-columns: 1fr; }
    .sp-hero { padding: 36px 0 24px; }
    .sp-hero__subtitle { font-size: 15px; }
    .sp-trust { font-size: 12px; padding: 8px 14px; }
    .sp-card { padding: 20px !important; }
    .sp-payment, .sp-auth { padding: 0 !important; }
    .sp-tab-content { padding: 20px 16px; }
    .sp-auth__tabs .sp-tab { padding: 14px 8px; font-size: 14px; }
    .sp-payment { padding: 20px !important; }
    .sp-payment__header { flex-direction: column; align-items: flex-start; }
    .sp-payment__header h2 { font-size: 20px; }
    .sp-payment__user { text-align: left; }
    .sp-btn { width: 100%; }
    .sp-btn--ghost { width: auto; }
    .sp-faq { padding: 24px 0; }
    .sp-faq h2 { font-size: 20px; }
    .sp-faq__item > summary { padding: 12px 14px; padding-right: 36px; font-size: 14px; }
    .sp-faq__item > p { padding: 0 14px 12px; font-size: 13px; }
    .sp-footer { padding: 20px 0; margin-top: 40px; }
    .sp-footer__brand { margin-bottom: 14px; padding-bottom: 14px; }
    .sp-result__details { grid-template-columns: 1fr; max-width: 100%; }
    .sp-result__actions { flex-direction: column; }
    .sp-result__actions .sp-btn { width: 100%; }
}

@media (max-width: 420px) {
    .sp-nav { gap: 10px; }
    .sp-nav a { font-size: 12px; }
    .sp-nav__logout { padding: 5px 10px; }
    .sp-hero__title { font-size: clamp(24px, 7vw, 32px); }
    .sp-trust__dot { display: none; }
}