:root {
    --bg-main: #081120;
    --bg-secondary: #101b2f;
    --panel-solid: rgba(12, 19, 34, 0.88);
    --panel-glass: rgba(255, 255, 255, 0.07);
    --text-main: #f8fafc;
    --text-soft: #b9c5da;
    --text-inverse: #0f172a;
    --border: rgba(255, 255, 255, 0.12);
    --input-bg: rgba(255, 255, 255, 0.08);
    --shadow: 0 28px 80px rgba(0, 0, 0, 0.35);
    --primary: #3b82f6;
    --primary-strong: #1d4ed8;
    --success-bg: rgba(34, 197, 94, 0.13);
    --success-text: #bbf7d0;
    --warning-bg: rgba(251, 191, 36, 0.13);
    --warning-text: #fde68a;
    --error-bg: rgba(239, 68, 68, 0.13);
    --error-text: #fecaca;
    --error-strong: #ef4444;
    --card-bg: linear-gradient(135deg, #111827, #1d4ed8 58%, #2563eb);
    --input-focus: rgba(59, 130, 246, 0.2);
}

:root[data-theme="light"] {
    --bg-main: #eef4ff;
    --bg-secondary: #dce8ff;
    --panel-solid: rgba(255, 255, 255, 0.96);
    --panel-glass: rgba(255, 255, 255, 0.58);
    --text-main: #0f172a;
    --text-soft: #475569;
    --text-inverse: #0f172a;
    --border: rgba(15, 23, 42, 0.1);
    --input-bg: rgba(255, 255, 255, 0.94);
    --shadow: 0 24px 70px rgba(30, 41, 59, 0.14);
    --primary: #2563eb;
    --primary-strong: #1d4ed8;
    --success-bg: #ecfdf5;
    --success-text: #166534;
    --warning-bg: #fffbeb;
    --warning-text: #92400e;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
    --error-strong: #dc2626;
    --card-bg: linear-gradient(135deg, #0f172a, #1d4ed8 58%, #60a5fa);
    --input-focus: rgba(37, 99, 235, 0.15);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    font-family: Inter, Arial, Helvetica, sans-serif;
}

body.theme-shell {
    color: var(--text-main);
    background:
        radial-gradient(circle at top left, rgba(59, 130, 246, 0.25), transparent 28%),
        radial-gradient(circle at bottom right, rgba(96, 165, 250, 0.18), transparent 28%),
        linear-gradient(135deg, var(--bg-main), var(--bg-secondary));
}

.theme-toggle {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 50;
    border: 1px solid var(--border);
    background: var(--panel-glass);
    color: var(--text-main);
    backdrop-filter: blur(16px);
    border-radius: 999px;
    padding: 10px 14px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    box-shadow: var(--shadow);
}

.theme-toggle:hover {
    transform: translateY(-1px);
}

.glass-panel,
.solid-panel {
    border-radius: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.glass-panel {
    background: var(--panel-glass);
    backdrop-filter: blur(18px);
}

.solid-panel {
    background: var(--panel-solid);
    backdrop-filter: blur(20px);
}

.auth-layout,
.checkout-layout,
.landing-layout {
    width: min(1280px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 100vh;
    gap: 24px;
    padding: 88px 0 34px;
}

.auth-layout,
.checkout-layout {
    display: grid;
    align-items: center;
}

.auth-layout {
    grid-template-columns: 1.15fr 0.85fr;
}

.checkout-layout {
    grid-template-columns: 1.1fr 0.9fr;
}

.landing-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    align-items: stretch;
}

.auth-hero,
.checkout-left,
.auth-card,
.checkout-right,
.landing-sidebar,
.landing-hero,
.landing-box,
.sidebar-card,
.hero-visual,
.landing-showcase {
    border-radius: 30px;
}

.auth-hero,
.checkout-left {
    padding: 34px;
}

.auth-card,
.checkout-right {
    padding: 28px;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.02;
    margin-bottom: 14px;
}

h2 {
    font-size: clamp(1.5rem, 2.4vw, 2.2rem);
    margin-bottom: 10px;
}

h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
}

p,
.subtext,
.sidebar-sub {
    color: var(--text-soft);
    line-height: 1.65;
}

.logo {
    font-size: 30px;
    font-weight: 900;
    letter-spacing: 0.3px;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 14px;
    padding: 9px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.3px;
    background: rgba(59, 130, 246, 0.16);
    color: #bfdbfe;
    border: 1px solid rgba(191, 219, 254, 0.15);
}

:root[data-theme="light"] .eyebrow {
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.1);
    border-color: rgba(37, 99, 235, 0.12);
}

.feature-stack,
.hero-feature-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hero-feature-row {
    margin: 22px 0 0;
}

.feature-chip,
.brand-pill,
.status-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 9px 13px;
    font-size: 13px;
    font-weight: 800;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.status-safe {
    background: var(--success-bg);
    color: var(--success-text);
}

.brand-pill {
    min-width: 110px;
    background: rgba(59, 130, 246, 0.16);
    color: #bfdbfe;
}

:root[data-theme="light"] .brand-pill {
    color: #1d4ed8;
    background: rgba(37, 99, 235, 0.08);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 18px;
    margin-bottom: 22px;
}

.wide-gap {
    margin-bottom: 28px;
}

.notice {
    border-radius: 18px;
    padding: 14px 16px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    line-height: 1.5;
}

.notice.warning {
    background: var(--warning-bg);
    color: var(--warning-text);
}

.notice.error {
    background: var(--error-bg);
    color: var(--error-text);
}

.notice.success {
    background: var(--success-bg);
    color: var(--success-text);
}

.btn-primary,
.btn-secondary,
.text-link {
    text-decoration: none;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 18px;
    border-radius: 14px;
    font-weight: 800;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-strong));
    color: #fff;
    box-shadow: 0 16px 36px rgba(37, 99, 235, 0.22);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--border);
}

:root[data-theme="light"] .btn-secondary {
    background: rgba(255, 255, 255, 0.7);
}

.btn-large {
    width: 100%;
    min-height: 52px;
}

.text-link {
    display: inline-block;
    margin-top: 14px;
    color: var(--text-soft);
}

.auth-form,
.checkout-form {
    display: grid;
    gap: 16px;
}

.field {
    display: grid;
    gap: 8px;
}

label {
    font-size: 14px;
    font-weight: 800;
    color: var(--text-main);
}

.input {
    width: 100%;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: var(--input-bg);
    color: var(--text-main);
    padding: 14px 16px;
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.input::placeholder {
    color: color-mix(in srgb, var(--text-soft) 82%, transparent);
}

.input:focus {
    border-color: rgba(96, 165, 250, 0.55);
    box-shadow: 0 0 0 4px var(--input-focus);
}

.input[readonly] {
    opacity: 0.9;
}

.input-error {
    border-color: var(--error-strong);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.08);
}

.error-text {
    min-height: 18px;
    color: var(--error-text);
    font-size: 12px;
    font-weight: 700;
}

.optional-text {
    font-size: 12px;
    color: var(--text-soft);
    font-weight: 700;
}

.helper-row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.split-fields {
    display: grid;
    grid-template-columns: 1fr 190px;
    gap: 14px;
}

.detail-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.compact-field {
    min-width: 0;
}

.demo-credentials {
    margin-top: 18px;
    border-radius: 18px;
    border: 1px solid var(--border);
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: rgba(255, 255, 255, 0.04);
}

.demo-credentials strong {
    font-size: 1.1rem;
}

.landing-sidebar {
    padding: 28px 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 24px;
}

.side-nav {
    display: grid;
    gap: 12px;
}

.side-link {
    text-decoration: none;
    color: inherit;
    padding: 14px 16px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.side-link:hover,
.side-link.active {
    transform: translateX(2px);
    background: rgba(59, 130, 246, 0.16);
    border-color: rgba(96, 165, 250, 0.28);
    color: #fff;
}

.sidebar-card,
.landing-box,
.landing-showcase,
.hero-visual {
    padding: 24px;
}

.landing-main {
    display: grid;
    gap: 22px;
}

.landing-hero {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 22px;
    padding: 34px;
    align-items: center;
}

.hero-actions {
    margin-top: 22px;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-top: 24px;
}

.stat-card,
.showcase-item,
.flow-steps div,
.info-box {
    border-radius: 20px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
}

.stat-card strong,
.visual-note p,
.mini-card-bottom strong,
.info-box strong,
.showcase-label {
    color: var(--text-main);
}

.stat-card span,
.info-title,
.feature-list,
.flow-steps div,
.showcase-item code {
    color: var(--text-soft);
}

.stat-card span {
    display: block;
    margin-top: 8px;
    font-size: 14px;
    line-height: 1.5;
}

.hero-visual {
    display: grid;
    gap: 18px;
}

.mini-payment-card,
.payment-card {
    position: relative;
    overflow: hidden;
    background: var(--card-bg);
    box-shadow: 0 26px 60px rgba(29, 78, 216, 0.26);
}

.mini-payment-card {
    border-radius: 28px;
    padding: 22px;
    min-height: 220px;
}

.mini-card-top,
.mini-card-bottom,
.card-top-row,
.card-bottom-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.visual-note {
    display: grid;
    gap: 12px;
}

.landing-grid,
.showcase-grid,
.info-grid {
    display: grid;
    gap: 18px;
}

.landing-grid {
    grid-template-columns: 1fr 1fr;
}

.showcase-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 22px;
}

.showcase-item code {
    display: block;
    margin-top: 8px;
    font-size: 13px;
    line-height: 1.6;
}

.feature-list {
    margin: 0;
    padding-left: 18px;
    line-height: 1.7;
}

.feature-list strong {
    color: var(--text-main);
}

.flow-steps {
    display: grid;
    gap: 12px;
}

.flow-steps span {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    background: rgba(59, 130, 246, 0.16);
    color: #bfdbfe;
    font-size: 13px;
    font-weight: 900;
}

.auth-hero,
.checkout-left {
    display: grid;
    gap: 22px;
}

.payment-card-wrap {
    perspective: 1200px;
}

.payment-card {
    border-radius: 30px;
    padding: 24px;
    min-height: 230px;
    transform-style: preserve-3d;
    transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}

.payment-card[data-brand="visa"] {
    background: linear-gradient(135deg, #111827, #1d4ed8 58%, #2563eb);
}

.payment-card[data-brand="mastercard"] {
    background: linear-gradient(135deg, #1f2937, #7c2d12 52%, #ea580c);
}

.payment-card[data-brand="amex"] {
    background: linear-gradient(135deg, #082f49, #0f766e 52%, #06b6d4);
}

.payment-card[data-brand="unknown"] {
    background: var(--card-bg);
}

.card-glow {
    position: absolute;
    inset: auto -20% -45% auto;
    width: 220px;
    height: 220px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    filter: blur(16px);
}

.card-chip {
    width: 56px;
    height: 42px;
    border-radius: 11px;
    background: linear-gradient(145deg, #fde68a, #f59e0b);
    display: inline-block;
}

.card-brand {
    display: inline-flex;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    font-size: 13px;
    font-weight: 900;
}

.card-number {
    margin: 28px 0;
    letter-spacing: 2.6px;
    font-size: clamp(1.1rem, 2vw, 1.7rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.3;
}

.card-label {
    display: block;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: rgba(255, 255, 255, 0.72);
    margin-bottom: 6px;
}

.card-bottom-row strong,
.mini-card-bottom strong {
    color: #fff;
}

.info-grid {
    margin-top: 2px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.info-box.full-width {
    grid-column: 1 / -1;
}

.info-title {
    display: block;
    margin-bottom: 8px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.4px;
    text-transform: uppercase;
}

.demo-card-list {
    display: grid;
    gap: 10px;
}

.demo-card-list code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 11px 12px;
}

.card-bounce {
    animation: cardBounce 0.45s ease;
}

@keyframes cardBounce {
    0% { transform: rotateX(0deg) translateY(0); }
    35% { transform: rotateX(8deg) translateY(-4px); }
    100% { transform: rotateX(0deg) translateY(0); }
}

@media (max-width: 1120px) {
    .auth-layout,
    .checkout-layout,
    .landing-layout,
    .landing-hero,
    .landing-grid,
    .hero-stats,
    .showcase-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .auth-layout,
    .checkout-layout,
    .landing-layout {
        width: min(100% - 24px, 100%);
    }

    .auth-hero,
    .checkout-left,
    .auth-card,
    .checkout-right,
    .landing-sidebar,
    .landing-hero,
    .landing-box,
    .landing-showcase,
    .hero-visual,
    .sidebar-card {
        padding: 20px;
    }

    .split-fields,
    .detail-fields,
    .info-grid {
        grid-template-columns: 1fr;
    }

    .info-box.full-width {
        grid-column: auto;
    }

    .panel-header {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 640px) {
    .theme-toggle {
        top: 12px;
        right: 12px;
        padding: 9px 12px;
    }

    .auth-layout,
    .checkout-layout,
    .landing-layout {
        width: min(100% - 16px, 100%);
        padding-top: 72px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }

    .card-number {
        letter-spacing: 1.8px;
    }
}