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

:root {
    --bg: #08080a;
    --bg2: #0d0d10;
    --bg3: #111116;
    --accent: #1864ff;
    --accent-glow: rgba(24, 100, 255, .5);
    --white: #f4f4f5;
    --dim: #71717a;
    --dimmer: #3f3f46;
    --border: rgba(255, 255, 255, .07);
    --success: #22c55e;
    --warn: #f59e0b;
    --danger: #ef4444;
    --font-serif: 'Instrument Serif', serif;
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Space Mono', monospace;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: var(--bg);
    color: var(--white);
    font-family: var(--font-sans);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navbar base -> assets/css/components.css (fonte unica; glass/light via theme-language.css) */

.checkout-page {
    padding: 108px 48px 56px;
}

.checkout-hero {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 34px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .14em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.hero-tag::before {
    content: '';
    width: 20px;
    height: 1px;
    background: var(--accent);
}

.checkout-hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.1rem, 4.8vw, 4rem);
    line-height: 1;
    letter-spacing: -.02em;
    margin-bottom: 14px;
}

.checkout-hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.checkout-hero p {
    color: var(--dim);
    line-height: 1.7;
    max-width: 620px;
    margin: 0 auto;
}

.checkout-layout {
    width: min(1180px, 100%);
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(320px, .8fr);
    gap: 20px;
    align-items: start;
}

.checkout-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 22px;
}

.card-title-wrap {
    margin-bottom: 16px;
}

.card-tag {
    font-size: .64rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--accent);
    font-family: var(--font-mono);
    margin-bottom: 6px;
}

.card-title-wrap h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    line-height: 1;
}

.checkout-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.field span {
    font-size: .74rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--dimmer);
    font-weight: 600;
}

.field input {
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg3);
    color: var(--white);
    font-size: .94rem;
    padding: 0 14px;
    outline: none;
    transition: border-color .2s, box-shadow .2s;
}

.field input:focus {
    border-color: rgba(24, 100, 255, .45);
    box-shadow: 0 0 0 3px rgba(24, 100, 255, .13);
}

.field-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.coupon-wrap {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: end;
}

.coupon-field {
    margin: 0;
}

.btn-ghost-inline {
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg3);
    color: var(--white);
    font-size: .86rem;
    font-weight: 600;
    padding: 0 16px;
    cursor: pointer;
    transition: all .2s;
}

.btn-ghost-inline:hover {
    border-color: rgba(255, 255, 255, .2);
}

.coupon-feedback {
    min-height: 18px;
    font-size: .78rem;
    color: var(--dim);
}

.coupon-feedback.ok {
    color: var(--success);
}

.coupon-feedback.err {
    color: var(--danger);
}

.checkout-submit {
    margin-top: 2px;
    height: 48px;
    border: none;
    border-radius: 12px;
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    font-size: .94rem;
    letter-spacing: .01em;
    cursor: pointer;
    transition: all .25s;
}

.checkout-submit:hover {
    background: #3a7fff;
    box-shadow: 0 0 28px var(--accent-glow);
}

.checkout-submit:disabled {
    cursor: not-allowed;
    opacity: .62;
    box-shadow: none;
}

.checkout-submit.ghost {
    background: var(--bg3);
    border: 1px solid var(--border);
    color: var(--white);
    box-shadow: none;
}

.checkout-submit.ghost:hover {
    background: #17171d;
    border-color: rgba(255, 255, 255, .18);
    box-shadow: none;
}

.secure-note {
    font-size: .78rem;
    color: var(--dim);
    line-height: 1.5;
}

.summary-plan {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: flex-start;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg3);
}

.summary-plan-name {
    font-size: 1rem;
    font-weight: 600;
}

.summary-plan-meta {
    margin-top: 4px;
    color: var(--dim);
    font-size: .82rem;
}

.summary-plan-price {
    font-size: 1rem;
    font-weight: 600;
    white-space: nowrap;
}

.billing-switch {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 14px;
}

.interval-option {
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--bg3);
    color: var(--dim);
    font-size: .82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s;
}

.interval-option span {
    color: var(--accent);
}

.interval-option:hover {
    border-color: rgba(255, 255, 255, .2);
    color: var(--white);
}

.interval-option.active {
    border-color: rgba(24, 100, 255, .42);
    color: var(--white);
    background: rgba(24, 100, 255, .12);
    box-shadow: inset 0 0 0 1px rgba(24, 100, 255, .2);
}

.payment-shell {
    display: grid;
    gap: 14px;
    margin-top: 6px;
}

.checkout-customer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background:
        linear-gradient(135deg, rgba(24, 100, 255, .14), transparent 50%),
        linear-gradient(180deg, rgba(255, 255, 255, .03), rgba(255, 255, 255, .01));
}

.checkout-customer-label {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--dimmer);
    font-family: var(--font-mono);
}

.checkout-customer strong {
    font-size: .92rem;
    color: var(--white);
    word-break: break-all;
    text-align: right;
}

.card-preview {
    position: relative;
    overflow: hidden;
    border-radius: 18px;
    padding: 18px;
    min-height: 190px;
    background:
        radial-gradient(circle at top left, rgba(24, 100, 255, .45), transparent 34%),
        radial-gradient(circle at bottom right, rgba(208, 168, 92, .24), transparent 32%),
        linear-gradient(145deg, #121219, #0c0c11 58%, #171720);
    border: 1px solid rgba(255, 255, 255, .08);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06);
}

.card-preview::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(120deg, transparent 18%, rgba(255, 255, 255, .08) 30%, transparent 42%);
    pointer-events: none;
}

.card-preview-top,
.card-preview-bottom {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-preview-chip {
    width: 42px;
    height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, #f7d78a, #c98f2f);
    box-shadow: 0 8px 24px rgba(201, 143, 47, .28);
}

.card-preview-brand {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .16em;
    color: rgba(255, 255, 255, .72);
}

.card-preview-number {
    position: relative;
    z-index: 1;
    margin: 34px 0 28px;
    font-family: var(--font-mono);
    font-size: 1.15rem;
    letter-spacing: .24em;
    color: #f5f5f5;
}

.card-preview-bottom {
    align-items: flex-end;
    gap: 10px;
}

.card-preview-bottom > div {
    display: grid;
    gap: 5px;
}

.card-preview-meta-label {
    font-size: .64rem;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: rgba(255, 255, 255, .5);
}

.card-preview-bottom strong {
    font-size: .9rem;
    color: #fff7e8;
}

.stripe-elements-wrap {
    border: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(255, 255, 255, .02), rgba(255, 255, 255, .01));
    border-radius: 16px;
    padding: 14px;
}

.stripe-elements-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.stripe-elements-head strong {
    display: block;
    font-size: .98rem;
}

.stripe-elements-tag {
    display: inline-block;
    margin-bottom: 4px;
    font-size: .66rem;
    text-transform: uppercase;
    letter-spacing: .14em;
    color: #d0a85c;
    font-family: var(--font-mono);
}

.stripe-elements-badge {
    padding: 7px 10px;
    border-radius: 999px;
    background: rgba(24, 100, 255, .12);
    border: 1px solid rgba(24, 100, 255, .22);
    color: #8eb3ff;
    font-size: .72rem;
    font-weight: 600;
}

.checkout-status {
    min-height: 20px;
    font-size: .8rem;
    color: var(--dim);
    margin-bottom: 10px;
}

.checkout-status.ok {
    color: var(--success);
}

.checkout-status.err {
    color: var(--danger);
}

.checkout-errors {
    display: none;
    margin-bottom: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    background: rgba(239, 68, 68, .08);
    border: 1px solid rgba(239, 68, 68, .24);
    color: #fca5a5;
    font-size: .82rem;
    line-height: 1.5;
}

.checkout-errors.active {
    display: block;
}

.payment-element-host {
    width: 100%;
    min-height: 420px;
    padding: 4px 0 0;
}

.upsell {
    margin-top: 14px;
    border: 1px solid rgba(24, 100, 255, .4);
    background: linear-gradient(180deg, rgba(24, 100, 255, .12), rgba(24, 100, 255, .04));
    border-radius: 12px;
    padding: 12px;
}

.upsell-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.upsell-head strong {
    font-size: .92rem;
}

.upsell-head span {
    font-family: var(--font-mono);
    font-size: .64rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--accent);
}

.upsell ul {
    list-style: none;
    display: grid;
    gap: 5px;
    margin-bottom: 10px;
}

.upsell li {
    color: var(--accent);
    font-size: .8rem;
}

.upsell-btn {
    width: 100%;
    height: 38px;
    border-radius: 10px;
    border: 1px solid rgba(24, 100, 255, .45);
    background: rgba(24, 100, 255, .14);
    color: var(--accent);
    font-size: .84rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .2s;
}

.upsell-btn:hover {
    background: rgba(24, 100, 255, .24);
}

.summary-lines {
    margin-top: 14px;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    display: grid;
    gap: 9px;
}

.summary-line {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: .86rem;
    color: var(--dim);
}

.summary-line strong {
    color: var(--white);
    font-weight: 500;
}

.summary-total {
    margin-top: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.summary-total span {
    font-size: .88rem;
    color: var(--dimmer);
}

.summary-total strong {
    font-size: 1.08rem;
}

.back-to-plans {
    margin-top: 14px;
    display: inline-flex;
    color: var(--dim);
    font-size: .82rem;
    border-bottom: 1px dashed rgba(255, 255, 255, .16);
    padding-bottom: 2px;
    transition: color .2s;
}

.back-to-plans:hover {
    color: var(--white);
}

@media (max-width: 1100px) {
    .checkout-page {
        padding: 100px 22px 48px;
    }

    .checkout-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .field-row,
    .coupon-wrap {
        grid-template-columns: 1fr;
    }

    .checkout-card {
        padding: 16px;
    }

    .checkout-customer,
    .stripe-elements-head,
    .card-preview-bottom {
        grid-template-columns: 1fr;
        display: grid;
    }

    .checkout-customer strong {
        text-align: left;
    }

    .card-preview-number {
        font-size: 1rem;
        letter-spacing: .18em;
    }
}