/* QRCheckSS Public UI/UX V4
   Enterprise cyber-intelligence theme. This layer intentionally overrides
   legacy presentation while preserving scanner/API element IDs and behavior. */

:root,
html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #07101f;
    --bg-2: #0a1426;
    --surface: #0e1b2f;
    --surface-soft: #101f35;
    --surface-elevated: #14243b;
    --card-bg: rgba(14, 27, 47, .86);
    --ink: #edf5ff;
    --ink-soft: #b3c3d9;
    --muted: #7f93ae;
    --primary: #34b6ff;
    --primary-dark: #1589cf;
    --primary-soft: rgba(52, 182, 255, .12);
    --purple: #8b7cff;
    --cyan: #2de2d0;
    --success: #31d6a0;
    --success-soft: rgba(49, 214, 160, .12);
    --warning: #f6c75b;
    --warning-soft: rgba(246, 199, 91, .12);
    --danger: #ff6f86;
    --danger-soft: rgba(255, 111, 134, .12);
    --border: rgba(142, 170, 205, .16);
    --border-strong: rgba(142, 190, 230, .28);
    --header-bg: rgba(6, 14, 27, .78);
    --shadow-sm: 0 10px 30px rgba(0, 0, 0, .2);
    --shadow: 0 28px 90px rgba(0, 0, 0, .34);
    --glow: 0 0 0 1px rgba(52, 182, 255, .05), 0 20px 80px rgba(24, 127, 205, .11);
}

html[data-theme="light"] {
    color-scheme: light;
    --bg: #f4f8fd;
    --bg-2: #edf4fc;
    --surface: #ffffff;
    --surface-soft: #f6f9fd;
    --surface-elevated: #ffffff;
    --card-bg: rgba(255, 255, 255, .92);
    --ink: #0c1c32;
    --ink-soft: #43566f;
    --muted: #6f8096;
    --primary: #087cc4;
    --primary-dark: #075f96;
    --primary-soft: rgba(8, 124, 196, .1);
    --purple: #6654df;
    --cyan: #078d85;
    --success: #0f9f70;
    --success-soft: rgba(15, 159, 112, .1);
    --warning: #b97906;
    --warning-soft: rgba(185, 121, 6, .1);
    --danger: #d33f59;
    --danger-soft: rgba(211, 63, 89, .1);
    --border: rgba(71, 98, 130, .14);
    --border-strong: rgba(50, 95, 135, .24);
    --header-bg: rgba(248, 252, 255, .85);
    --shadow-sm: 0 10px 30px rgba(18, 50, 86, .08);
    --shadow: 0 30px 80px rgba(15, 48, 84, .13);
    --glow: 0 0 0 1px rgba(8, 124, 196, .04), 0 20px 70px rgba(8, 124, 196, .08);
}

html {
    background: var(--bg);
}

body {
    min-height: 100vh;
    color: var(--ink);
    background:
        radial-gradient(circle at 12% 5%, rgba(32, 133, 219, .16), transparent 29rem),
        radial-gradient(circle at 88% 16%, rgba(128, 86, 229, .11), transparent 32rem),
        linear-gradient(180deg, var(--bg), var(--bg-2) 58%, var(--bg));
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    opacity: .22;
    background-image:
        linear-gradient(rgba(120, 160, 200, .035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(120, 160, 200, .035) 1px, transparent 1px);
    background-size: 34px 34px;
    mask-image: linear-gradient(to bottom, #000 0%, transparent 75%);
}

::selection {
    background: rgba(52, 182, 255, .28);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
    outline: 3px solid rgba(52, 182, 255, .36);
    outline-offset: 3px;
}

.container {
    width: min(calc(100% - 40px), 1240px);
}

/* Header / navigation */
.site-header {
    position: sticky;
    top: 0;
    z-index: 200;
    border-bottom: 1px solid transparent;
    background: var(--header-bg);
    backdrop-filter: blur(22px) saturate(145%);
    transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}

.site-header.is-scrolled {
    border-bottom-color: var(--border);
    box-shadow: 0 10px 40px rgba(0, 0, 0, .1);
}

.nav-wrap {
    min-height: 78px;
    gap: 20px;
}

.brand {
    gap: 12px;
    margin-inline-end: auto;
    margin-left: 0;
}

[dir="rtl"] .brand {
    margin-inline-end: 0;
    margin-inline-start: auto;
}

.brand-mark {
    position: relative;
    width: 46px;
    height: 46px;
    border-radius: 15px;
    color: white;
    background:
        linear-gradient(145deg, #19a7eb 0%, #386af1 48%, #8e63f2 100%);
    box-shadow: 0 12px 34px rgba(44, 126, 229, .28);
    overflow: hidden;
}

.brand-mark::after {
    content: "";
    position: absolute;
    width: 22px;
    height: 22px;
    right: -8px;
    bottom: -8px;
    border: 4px solid rgba(255,255,255,.38);
    border-radius: 5px;
}

.brand-copy strong {
    color: var(--ink);
    font-size: 18px;
    letter-spacing: -.02em;
}

.brand-copy small {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: .1em;
}

.main-nav {
    gap: 6px;
    color: var(--ink-soft);
    font-size: 13px;
    font-weight: 700;
}

.main-nav a {
    padding: 9px 11px;
    border-radius: 10px;
    transition: color .18s ease, background .18s ease, transform .18s ease;
}

.main-nav a:hover,
.main-nav a.is-active {
    color: var(--ink);
    background: var(--primary-soft);
    transform: translateY(-1px);
}

.nav-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.language-toggle,
.theme-toggle,
.nav-menu-toggle {
    min-height: 42px;
    border: 1px solid var(--border);
    color: var(--ink-soft);
    background: rgba(130, 155, 185, .07);
    border-radius: 12px;
    transition: border .18s ease, color .18s ease, background .18s ease, transform .18s ease;
}

.language-toggle {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 12px;
}

.theme-toggle,
.nav-menu-toggle {
    width: 42px;
    display: inline-grid;
    place-items: center;
    padding: 0;
    font-size: 18px;
}

.language-toggle:hover,
.theme-toggle:hover,
.nav-menu-toggle:hover {
    color: var(--primary);
    border-color: rgba(52, 182, 255, .34);
    background: var(--primary-soft);
    transform: translateY(-1px);
}

.nav-cta {
    min-height: 42px;
    border: 1px solid rgba(52, 182, 255, .38);
    border-radius: 12px;
    padding: 8px 17px;
    color: #fff;
    background: linear-gradient(135deg, #169fe5, #4768ef);
    box-shadow: 0 12px 28px rgba(42, 127, 223, .2);
}

.nav-menu-toggle {
    display: none;
}

.site-announcement {
    padding: 8px 18px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    color: var(--ink-soft);
    background: rgba(52, 182, 255, .08);
    font-size: 12px;
    font-weight: 650;
}

/* Hero */
.hero {
    position: relative;
    min-height: 650px;
    display: flex;
    align-items: center;
    padding: 96px 0 82px;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(circle at 73% 42%, rgba(48, 173, 255, .15), transparent 19rem),
        radial-gradient(circle at 80% 30%, rgba(131, 89, 240, .12), transparent 24rem);
}

.hero-grid {
    position: relative;
    grid-template-columns: minmax(0, 1.08fr) minmax(360px, .92fr);
    gap: 76px;
}

.eyebrow,
.v4-eyebrow {
    width: fit-content;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 22px;
    padding: 8px 12px;
    border: 1px solid rgba(52, 182, 255, .24);
    border-radius: 999px;
    color: var(--primary);
    background: rgba(52, 182, 255, .07);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .06em;
}

.pulse-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--cyan);
    box-shadow: 0 0 0 6px rgba(45, 226, 208, .09), 0 0 22px rgba(45, 226, 208, .6);
}

.hero h1 {
    max-width: 760px;
    margin: 0;
    color: var(--ink);
    font-size: clamp(46px, 6.3vw, 82px);
    line-height: .98;
    letter-spacing: -.045em;
}

.hero h1 span {
    display: block;
    margin-top: 9px;
    color: transparent;
    background: linear-gradient(90deg, #34b6ff 0%, #2de2d0 48%, #9c7cff 100%);
    -webkit-background-clip: text;
    background-clip: text;
}

.hero-lead {
    max-width: 670px;
    margin: 26px 0 0;
    color: var(--ink-soft);
    font-size: clamp(17px, 2vw, 20px);
    line-height: 1.9;
}

.hero-actions {
    margin-top: 34px;
}

.btn,
.v4-button {
    border-radius: 13px;
    font-weight: 800;
}

.btn-primary,
.v4-button-primary {
    border: 1px solid rgba(52, 182, 255, .4);
    color: #fff;
    background: linear-gradient(135deg, #159ee5 0%, #4468ef 100%);
    box-shadow: 0 14px 34px rgba(32, 127, 225, .2);
}

.btn-secondary,
.v4-button-secondary {
    color: var(--ink);
    border: 1px solid var(--border-strong);
    background: rgba(130, 160, 195, .07);
}

.trust-row {
    margin-top: 34px;
    color: var(--muted);
}

.trust-row div {
    border-color: var(--border);
}

.trust-icon {
    color: var(--success);
}

.qr-visual-card,
.floating-card {
    color: var(--ink);
    border-color: var(--border-strong);
    background: rgba(13, 26, 46, .82);
    box-shadow: var(--shadow);
    backdrop-filter: blur(14px);
}

html[data-theme="light"] .qr-visual-card,
html[data-theme="light"] .floating-card {
    background: rgba(255, 255, 255, .9);
}

.fake-qr {
    border-color: var(--border);
    background: rgba(255,255,255,.98);
}

/* Public trust strip */
.stats-strip {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: rgba(130, 155, 190, .035);
}

.stats-strip-grid > div {
    border-color: var(--border);
}

.stats-strip strong {
    color: var(--ink);
}

.stats-strip span {
    color: var(--muted);
}

/* Sections and legacy cards */
.section {
    padding: 98px 0;
}

.section-heading .section-kicker,
.v4-kicker {
    color: var(--primary);
    font-size: 11px;
    font-weight: 850;
    letter-spacing: .13em;
    text-transform: uppercase;
}

.section-heading h2,
.v4-section-title {
    color: var(--ink);
    letter-spacing: -.025em;
}

.section-heading p,
.v4-section-lead {
    color: var(--ink-soft);
}

.scanner-card,
.scanner-info,
.status-card,
.result-hero,
.result-panel,
.reports-card,
.dashboard-card,
.how-card,
.about-security-card,
.qrv3-card {
    border: 1px solid var(--border) !important;
    color: var(--ink);
    background: var(--card-bg) !important;
    box-shadow: var(--glow) !important;
    backdrop-filter: blur(18px);
}

.scanner-card,
.status-card,
.result-hero,
.result-panel,
.reports-card,
.dashboard-card,
.qrv3-card {
    border-radius: 22px !important;
}

.scanner-tabs {
    border-color: var(--border);
    background: rgba(130, 155, 190, .05);
}

.scanner-tab {
    color: var(--muted);
}

.scanner-tab.active {
    color: var(--primary);
    background: var(--primary-soft);
}

.drop-zone {
    color: var(--ink-soft);
    border-color: rgba(52, 182, 255, .32);
    background: rgba(52, 182, 255, .045);
}

.drop-zone:hover {
    border-color: var(--primary);
    background: rgba(52, 182, 255, .08);
}

.drop-zone strong,
.scanner-info strong,
.status-card h3,
.result-panel h3 {
    color: var(--ink);
}

.helper-text,
.scanner-info p,
.status-text,
.result-panel p {
    color: var(--ink-soft);
}

input,
textarea,
select {
    color: var(--ink);
    border-color: var(--border-strong);
    background: rgba(120, 150, 185, .06);
}

.analysis-step,
.result-metric,
.dashboard-stat,
.activity-item {
    border-color: var(--border);
    background: rgba(120, 150, 185, .045);
}

.progress-track,
.risk-track {
    background: rgba(120, 150, 185, .12);
}

.table-wrap {
    border-color: var(--border);
}

table {
    color: var(--ink-soft);
}

th {
    color: var(--muted);
    background: rgba(120, 150, 185, .05);
}

td,
th {
    border-color: var(--border) !important;
}

/* V3 live analysis result modernization */
#qrv3-result {
    margin-top: 54px;
    margin-bottom: 90px;
}

.qrv3-shell {
    gap: 16px;
}

.qrv3-card {
    padding: 24px;
}

.qrv3-main,
.qrv3-metric,
.qrv3-field,
.qrv3-status,
.qrv3-tech pre {
    color: var(--ink);
    background: rgba(120, 150, 185, .055);
}

.qrv3-main {
    position: relative;
    overflow: hidden;
}

.qrv3-main::after {
    content: "";
    position: absolute;
    width: 130px;
    height: 130px;
    right: -52px;
    top: -60px;
    border-radius: 50%;
    background: rgba(52, 182, 255, .08);
    filter: blur(4px);
}

.qrv3-risk {
    color: var(--ink);
}

.qrv3-label,
.qrv3-small,
.qrv3-muted {
    color: var(--muted);
    opacity: 1;
}

.qrv3-alert {
    border-color: var(--border);
    background: rgba(120, 150, 185, .035);
}

.qrv3-badge {
    color: var(--warning);
    background: var(--warning-soft);
}

.qrv3-ml-card {
    position: relative;
    overflow: hidden;
    border-color: rgba(139, 124, 255, .26) !important;
    background:
        radial-gradient(circle at 92% 12%, rgba(139, 124, 255, .13), transparent 20rem),
        var(--card-bg) !important;
}

.qrv3-ml-verdict {
    display: grid;
    grid-template-columns: 1.1fr repeat(3, minmax(120px, .6fr));
    gap: 12px;
}

.qrv3-ml-primary {
    padding: 18px;
    border: 1px solid rgba(139, 124, 255, .18);
    border-radius: 15px;
    background: rgba(139, 124, 255, .07);
}

.qrv3-ml-prediction {
    display: block;
    margin-top: 4px;
    color: var(--ink);
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.05;
    font-weight: 900;
}

/* New content pages */
.v4-page-hero {
    position: relative;
    padding: 104px 0 66px;
    overflow: hidden;
}

.v4-page-hero::after {
    content: "";
    position: absolute;
    width: 520px;
    height: 520px;
    inset-inline-end: -180px;
    top: -220px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(52, 182, 255, .13), transparent 68%);
    pointer-events: none;
}

.v4-page-hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, .7fr);
    gap: 56px;
    align-items: end;
}

.v4-page-hero h1 {
    max-width: 920px;
    margin: 0;
    color: var(--ink);
    font-size: clamp(42px, 6vw, 76px);
    line-height: 1.02;
    letter-spacing: -.045em;
}

.v4-page-hero p {
    max-width: 780px;
    margin: 24px 0 0;
    color: var(--ink-soft);
    font-size: 18px;
    line-height: 1.9;
}

.v4-hero-aside {
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--card-bg);
    box-shadow: var(--glow);
}

.v4-hero-aside strong {
    display: block;
    margin-top: 8px;
    font-size: 28px;
}

.v4-hero-aside span {
    color: var(--muted);
    font-size: 13px;
}

.v4-section {
    padding: 86px 0;
}

.v4-section + .v4-section {
    border-top: 1px solid rgba(120, 150, 185, .08);
}

.v4-section-head {
    max-width: 840px;
    margin-bottom: 34px;
}

.v4-section-title {
    margin: 8px 0 10px;
    font-size: clamp(30px, 4vw, 46px);
    line-height: 1.14;
}

.v4-section-lead {
    margin: 0;
    font-size: 16px;
    line-height: 1.9;
}

.v4-grid-2,
.v4-grid-3,
.v4-grid-4 {
    display: grid;
    gap: 16px;
}

.v4-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.v4-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.v4-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.v4-card {
    position: relative;
    min-width: 0;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--ink);
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.v4-card::before {
    content: "";
    position: absolute;
    top: 0;
    inset-inline-start: 0;
    width: 70px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--cyan));
}

.v4-card h2,
.v4-card h3 {
    margin: 9px 0 8px;
    color: var(--ink);
}

.v4-card p,
.v4-card li {
    color: var(--ink-soft);
}

.v4-card p {
    margin: 0;
}

.v4-icon-box {
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    margin-bottom: 18px;
    border: 1px solid rgba(52, 182, 255, .2);
    border-radius: 14px;
    color: var(--primary);
    background: var(--primary-soft);
    font-size: 20px;
    font-weight: 900;
}

.v4-metric-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
}

.v4-metric-card strong {
    display: block;
    margin: 8px 0 5px;
    color: var(--ink);
    font-size: clamp(26px, 4vw, 42px);
    line-height: 1;
}

.v4-metric-card span {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.v4-feature-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 9px 18px;
    padding: 0;
    margin: 18px 0 0;
    list-style: none;
}

.v4-feature-list li {
    display: flex;
    gap: 9px;
    align-items: flex-start;
    padding: 10px 0;
    border-bottom: 1px solid rgba(120, 150, 185, .08);
}

.v4-feature-list li::before {
    content: "✓";
    color: var(--cyan);
    font-weight: 900;
}

.v4-callout {
    padding: 22px 24px;
    border: 1px solid rgba(52, 182, 255, .24);
    border-radius: 18px;
    color: var(--ink-soft);
    background: rgba(52, 182, 255, .06);
}

.v4-callout strong {
    color: var(--ink);
}

.v4-callout-warning {
    border-color: rgba(246, 199, 91, .25);
    background: var(--warning-soft);
}

.v4-flow {
    display: grid;
    grid-template-columns: repeat(7, minmax(120px, 1fr));
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.v4-flow-step {
    min-width: 135px;
    position: relative;
    padding: 18px 15px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--card-bg);
}

.v4-flow-step:not(:last-child)::after {
    content: "→";
    position: absolute;
    inset-inline-end: -10px;
    top: 50%;
    z-index: 2;
    transform: translateY(-50%);
    color: var(--primary);
    font-weight: 900;
}

[dir="rtl"] .v4-flow-step:not(:last-child)::after {
    content: "←";
}

.v4-flow-step strong {
    display: block;
    margin-top: 8px;
}

.v4-flow-step span {
    color: var(--muted);
    font-size: 11px;
}

.v4-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--card-bg);
}

.v4-table {
    width: 100%;
    min-width: 720px;
    border-collapse: collapse;
}

.v4-table th,
.v4-table td {
    padding: 15px 16px;
    text-align: start;
    border-bottom: 1px solid var(--border);
}

.v4-table th {
    color: var(--muted);
    font-size: 11px;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.v4-table td {
    color: var(--ink-soft);
    font-size: 14px;
}

.v4-table tr:last-child td {
    border-bottom: 0;
}

.v4-table .is-best {
    color: var(--success);
    font-weight: 900;
}

.v4-matrix {
    display: grid;
    grid-template-columns: 120px repeat(2, minmax(110px, 1fr));
    gap: 8px;
    max-width: 560px;
}

.v4-matrix > div {
    min-height: 86px;
    display: grid;
    place-items: center;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 14px;
    text-align: center;
    background: var(--card-bg);
}

.v4-matrix .axis {
    min-height: auto;
    color: var(--muted);
    background: transparent;
    border-style: dashed;
    font-size: 11px;
}

.v4-matrix .good {
    color: var(--success);
    background: var(--success-soft);
}

.v4-matrix .bad {
    color: var(--danger);
    background: var(--danger-soft);
}

.v4-matrix strong {
    display: block;
    font-size: 30px;
}

.v4-bars {
    display: grid;
    gap: 16px;
}

.v4-bar-row {
    display: grid;
    grid-template-columns: 160px 1fr 70px;
    gap: 14px;
    align-items: center;
}

.v4-bar-track {
    height: 11px;
    border-radius: 999px;
    background: rgba(120, 150, 185, .1);
    overflow: hidden;
}

.v4-bar-value {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--primary), var(--cyan));
}

.v4-code {
    overflow-x: auto;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    color: #bfe3ff;
    background: #07111f;
    font: 12px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

html[data-theme="light"] .v4-code {
    color: #163b5d;
    background: #edf5fb;
}

.v4-badges,
.v4-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.v4-badge,
.v4-chip-link,
.v4-level {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 999px;
    color: var(--ink-soft);
    background: rgba(120, 150, 185, .06);
    font-size: 11px;
    font-weight: 800;
}

.v4-chip-link:hover {
    color: var(--primary);
    border-color: rgba(52, 182, 255, .34);
}

.v4-level-core,
.v4-level-advanced {
    color: var(--cyan);
    border-color: rgba(45, 226, 208, .24);
    background: rgba(45, 226, 208, .07);
}

.v4-skill-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.v4-skill-card {
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--card-bg);
}

.v4-skill-card h3 {
    margin: 7px 0 14px;
}

.v4-timeline {
    position: relative;
    display: grid;
    gap: 0;
}

.v4-timeline::before {
    content: "";
    position: absolute;
    inset-inline-start: 10px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: var(--border-strong);
}

.v4-timeline-item {
    position: relative;
    display: grid;
    grid-template-columns: 22px 1fr;
    gap: 18px;
    padding: 0 0 30px;
}

.v4-timeline-dot {
    width: 11px;
    height: 11px;
    margin-top: 8px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    background: var(--bg);
    box-shadow: 0 0 0 5px rgba(52, 182, 255, .08);
}

.v4-timeline-item h3 {
    margin: 3px 0 4px;
}

.v4-timeline-subtitle {
    display: block;
    margin-bottom: 7px;
    color: var(--primary);
    font-size: 13px;
}

.v4-timeline-item p {
    margin: 0;
    color: var(--ink-soft);
}

/* Home V4 feature cards */
.v4-home-capabilities {
    padding: 82px 0;
    border-bottom: 1px solid rgba(120,150,185,.08);
}

.v4-capability-link {
    transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.v4-capability-link:hover {
    transform: translateY(-4px);
    border-color: rgba(52, 182, 255, .28);
}

.v4-research-banner {
    display: grid;
    grid-template-columns: 1.2fr .8fr;
    gap: 28px;
    align-items: center;
    padding: 34px;
    border: 1px solid rgba(139,124,255,.24);
    border-radius: 24px;
    background:
        radial-gradient(circle at 90% 20%, rgba(139,124,255,.13), transparent 18rem),
        var(--card-bg);
    box-shadow: var(--shadow);
}

.v4-research-metrics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.v4-research-metrics div {
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: rgba(120,150,185,.04);
}

.v4-research-metrics strong {
    display: block;
    font-size: 26px;
}

.v4-research-metrics span {
    color: var(--muted);
    font-size: 11px;
}

.developer-preview {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 22px;
    align-items: center;
    padding: 28px;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
}

.developer-avatar,
.about-avatar {
    width: 82px;
    height: 82px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(52,182,255,.25);
    border-radius: 22px;
    color: var(--primary);
    background: var(--primary-soft);
    font-size: 26px;
    font-weight: 900;
    overflow: hidden;
}

.about-avatar {
    width: min(260px, 100%);
    aspect-ratio: 1;
    height: auto;
    border-radius: 30px;
}

.developer-avatar img,
.about-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.developer-preview h3 {
    margin: 3px 0 4px;
    font-size: 24px;
}

.developer-preview p {
    margin: 7px 0 0;
    color: var(--ink-soft);
}

.about-layout {
    display: grid;
    grid-template-columns: minmax(240px, .65fr) minmax(0, 1.35fr);
    gap: 38px;
    align-items: start;
}

.about-profile-copy h1 {
    margin: 7px 0 4px;
    font-size: clamp(40px, 5vw, 64px);
    line-height: 1.03;
}

.about-profile-copy h2 {
    margin: 0;
    color: var(--primary);
    font-size: 20px;
}

.about-profile-copy .headline {
    margin: 18px 0 0;
    color: var(--ink-soft);
    font-size: 19px;
}

.about-meta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 24px;
}

.about-meta-grid div {
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: rgba(120,150,185,.04);
}

.about-meta-grid span {
    display: block;
    color: var(--muted);
    font-size: 11px;
}

.about-meta-grid strong {
    display: block;
    margin-top: 3px;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    color: var(--ink-soft);
    background: rgba(5, 12, 23, .42);
}

html[data-theme="light"] .site-footer {
    background: rgba(235, 243, 251, .62);
}

.footer-wrap-v4 {
    display: grid;
    grid-template-columns: 1.1fr 1.6fr .9fr;
    gap: 34px;
    padding: 44px 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 18px;
}

.footer-links a {
    color: var(--muted);
    font-size: 13px;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-note {
    color: var(--muted);
    font-size: 12px;
    line-height: 1.8;
}

/* Reveal */
[data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .5s ease, transform .5s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}

/* Responsive */
@media (max-width: 1080px) {
    .main-nav {
        position: absolute;
        top: calc(100% + 8px);
        inset-inline: 20px;
        display: none;
        padding: 12px;
        border: 1px solid var(--border);
        border-radius: 16px;
        background: var(--surface);
        box-shadow: var(--shadow);
    }

    .main-nav.is-open {
        display: grid;
    }

    .main-nav a {
        padding: 12px 14px;
    }

    .nav-menu-toggle {
        display: inline-grid;
    }

    .nav-cta {
        display: none;
    }

    .hero-grid,
    .v4-page-hero-grid,
    .v4-research-banner,
    .about-layout {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        max-width: 560px;
        width: 100%;
        margin-inline: auto;
    }

    .v4-grid-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .v4-grid-3,
    .v4-skill-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-wrap-v4 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 760px) {
    .container {
        width: min(calc(100% - 24px), 1240px);
    }

    .nav-wrap {
        min-height: 68px;
        gap: 9px;
    }

    .brand-copy small {
        display: none;
    }

    .language-toggle {
        width: 42px;
        padding: 0;
        justify-content: center;
    }

    .language-toggle #languageToggleText {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 72px 0 62px;
    }

    .hero-grid {
        gap: 46px;
    }

    .hero h1 {
        font-size: clamp(43px, 13vw, 66px);
    }

    .hero-lead {
        font-size: 16px;
    }

    .hero-actions,
    .trust-row {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .section,
    .v4-section {
        padding: 68px 0;
    }

    .v4-page-hero {
        padding: 74px 0 50px;
    }

    .v4-page-hero h1 {
        font-size: clamp(39px, 12vw, 58px);
    }

    .v4-grid-2,
    .v4-grid-3,
    .v4-grid-4,
    .v4-skill-grid,
    .v4-feature-list,
    .about-meta-grid,
    .v4-research-metrics {
        grid-template-columns: 1fr;
    }

    .qrv3-ml-verdict {
        grid-template-columns: 1fr;
    }

    .v4-bar-row {
        grid-template-columns: 110px 1fr 58px;
        gap: 9px;
        font-size: 12px;
    }

    .v4-matrix {
        grid-template-columns: 86px repeat(2, minmax(90px, 1fr));
    }

    .developer-preview {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .developer-avatar {
        margin-inline: auto;
    }

    .footer-wrap-v4 {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}