/* ==========================================================================
   练了么 — Landing surface (/)
   Audience: HR / EHS decision makers and hackathon reviewers.
   Goal: prove the loop in 10 seconds, then make you want to stand up and move.
   ========================================================================== */

body {
    background: var(--n-0);
}

/* --------------------------------------------------------------------------
   Navigation — glass, hairline, collapses cleanly
   -------------------------------------------------------------------------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 60;
    background: rgba(255, 255, 255, 0.76);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
        background var(--t) var(--ease);
}

.nav.stuck {
    border-bottom-color: var(--line);
    box-shadow: 0 1px 0 rgba(16, 30, 54, 0.02), 0 8px 24px -18px rgba(16, 30, 54, 0.4);
}

.nav-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    height: 62px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 680;
    font-size: 15.5px;
    letter-spacing: -0.024em;
    color: var(--text);
    flex: none;
}

.brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 9px;
    background: linear-gradient(145deg, var(--b-500), var(--b-700) 62%, var(--g-600));
    display: grid;
    place-items: center;
    box-shadow: var(--sh-brand);
    flex: none;
}

.brand-sub {
    font-size: 11px;
    font-weight: 560;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-4);
    padding-left: 10px;
    margin-left: 2px;
    border-left: 1px solid var(--line-strong);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}

.nav-links a {
    padding: 7px 11px;
    border-radius: var(--r-sm);
    font-size: 13.5px;
    font-weight: 540;
    color: var(--text-2);
    transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.nav-links a:hover {
    color: var(--text);
    background: var(--surface-2);
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: none;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    overflow: hidden;
    padding-top: clamp(44px, 6vw, 76px);
    padding-bottom: clamp(24px, 3vw, 40px);
    background: linear-gradient(180deg, #fdfefe 0%, var(--bg-tint) 62%, var(--n-0) 100%);
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: center;
}

.hero-copy {
    max-width: 620px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    height: 30px;
    padding: 0 12px 0 10px;
    border-radius: var(--r-full);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    box-shadow: var(--sh-xs);
    font-size: 12px;
    font-weight: 580;
    color: var(--text-2);
}

.hero-badge b {
    font-weight: 640;
    color: var(--b-700);
}

.hero h1 {
    margin: 20px 0 0;
    font-size: clamp(42px, 6vw, 72px);
    font-weight: 720;
    line-height: 1.02;
    letter-spacing: -0.042em;
}

.hero h1 em {
    font-style: normal;
    display: inline-block;
}

.hero-sub {
    margin: 18px 0 0;
    font-size: clamp(17px, 1.7vw, 20px);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--n-800);
    line-height: 1.42;
}

.hero-copytext {
    margin: 14px 0 0;
    font-size: 15.5px;
    line-height: 1.72;
    color: var(--text-2);
    max-width: 560px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 26px;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-top: 22px;
    font-size: 12.5px;
    color: var(--text-3);
}

.hero-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.hero-meta svg {
    color: var(--g-500);
    flex: none;
}

/* ---- Hero visual: the one dark surface ---- */
.hero-visual {
    position: relative;
    border-radius: var(--r-2xl);
    background: linear-gradient(168deg, var(--stage-2), var(--stage) 58%, #070d16);
    border: 1px solid rgba(148, 174, 214, 0.14);
    box-shadow: 0 2px 6px rgba(9, 18, 33, 0.2), 0 40px 80px -28px rgba(9, 18, 33, 0.58),
        inset 0 1px 0 rgba(255, 255, 255, 0.07);
    padding: 12px;
    isolation: isolate;
}

.hero-visual::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(520px 240px at 78% -8%, rgba(47, 107, 255, 0.3), transparent 62%),
        radial-gradient(420px 220px at 12% 104%, rgba(31, 198, 137, 0.2), transparent 66%);
    pointer-events: none;
}

.hv-chrome {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 6px 12px;
}

.hv-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 24px;
    padding: 0 9px;
    border-radius: var(--r-full);
    background: rgba(148, 174, 214, 0.12);
    border: 1px solid rgba(148, 174, 214, 0.18);
    color: var(--stage-text-2);
    font-size: 11px;
    font-weight: 580;
    letter-spacing: 0.01em;
    white-space: nowrap;
}

.hv-chip.live {
    background: rgba(31, 198, 137, 0.14);
    border-color: rgba(31, 198, 137, 0.34);
    color: #7ff0c4;
}

.hv-chip.mono {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0;
}

.hv-chrome .spacer {
    margin-left: auto;
}

.hv-canvas-wrap {
    position: relative;
    border-radius: var(--r-lg);
    overflow: hidden;
    background: radial-gradient(80% 70% at 50% 34%, #10203a 0%, #0a1322 62%, #070d17 100%);
    aspect-ratio: 4 / 3;
    border: 1px solid rgba(148, 174, 214, 0.12);
}

#heroPose {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.hv-hud {
    position: absolute;
    inset: 0;
    padding: 14px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    pointer-events: none;
}

.hv-hud-top {
    display: flex;
    justify-content: flex-end;
}

.hv-count {
    min-width: 92px;
    padding: 9px 13px 10px;
    border-radius: var(--r-lg);
    background: rgba(8, 15, 26, 0.62);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(148, 174, 214, 0.18);
    text-align: right;
}

.hv-count span {
    display: block;
    font-size: 10px;
    font-weight: 620;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--stage-text-2);
}

.hv-count strong {
    display: block;
    font-size: 34px;
    font-weight: 700;
    line-height: 1.06;
    letter-spacing: -0.04em;
    color: #fff;
    font-variant-numeric: tabular-nums;
}

.hv-cue {
    align-self: flex-start;
    max-width: 100%;
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 9px 14px 9px 11px;
    border-radius: var(--r-lg);
    background: rgba(8, 15, 26, 0.66);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(148, 174, 214, 0.18);
    color: var(--stage-text);
    font-size: 13.5px;
    font-weight: 560;
    letter-spacing: -0.01em;
    transition: border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.hv-cue[data-tone="alert"] {
    border-color: rgba(251, 146, 60, 0.44);
    background: rgba(60, 24, 8, 0.66);
}

.hv-cue[data-tone="good"] {
    border-color: rgba(31, 198, 137, 0.4);
    background: rgba(6, 44, 33, 0.62);
}

.hv-cue i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--g-400);
    flex: none;
    transition: background var(--t) var(--ease);
}

.hv-cue[data-tone="alert"] i {
    background: #fb923c;
}

.hv-foot {
    position: relative;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 12px 6px 4px;
}

.hv-stat {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.hv-stat b {
    font-size: 13.5px;
    font-weight: 640;
    color: var(--stage-text);
    letter-spacing: -0.016em;
    font-variant-numeric: tabular-nums;
}

.hv-stat span {
    font-size: 10.5px;
    font-weight: 540;
    letter-spacing: 0.04em;
    color: rgba(215, 227, 245, 0.6);
    text-transform: uppercase;
}

.hv-divider {
    width: 1px;
    align-self: stretch;
    background: rgba(148, 174, 214, 0.16);
}

/* --------------------------------------------------------------------------
   Proof strip
   -------------------------------------------------------------------------- */
.proof {
    position: relative;
    z-index: 1;
    margin-top: clamp(34px, 4.5vw, 58px);
}

.proof-inner {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--r-xl);
    overflow: hidden;
    box-shadow: var(--sh-sm);
}

.proof-cell {
    background: var(--surface);
    padding: 20px 22px;
}

.proof-cell b {
    display: block;
    font-size: clamp(24px, 2.5vw, 30px);
    font-weight: 700;
    letter-spacing: -0.036em;
    line-height: 1.1;
    color: var(--text);
    font-variant-numeric: tabular-nums;
}

.proof-cell b i {
    font-style: normal;
    font-size: 0.62em;
    font-weight: 620;
    color: var(--text-3);
    letter-spacing: -0.01em;
    margin-left: 2px;
}

.proof-cell span {
    display: block;
    margin-top: 5px;
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--text-3);
}

/* --------------------------------------------------------------------------
   Section scaffolding
   -------------------------------------------------------------------------- */
.section {
    padding-block: clamp(56px, 7vw, 100px);
}

.section-alt {
    background: linear-gradient(180deg, var(--n-0), var(--bg-tint) 46%, var(--n-0));
    border-block: 1px solid var(--line);
}

.section-head {
    max-width: 720px;
    margin-bottom: clamp(26px, 3.4vw, 44px);
}

.section-head h2 {
    margin: 12px 0 0;
    font-size: clamp(26px, 3.2vw, 40px);
    font-weight: 700;
    letter-spacing: -0.034em;
    line-height: 1.12;
}

.section-head p {
    margin: 13px 0 0;
    font-size: 16px;
    line-height: 1.68;
    color: var(--text-2);
}

.section-head.center {
    margin-inline: auto;
    text-align: center;
}

/* --------------------------------------------------------------------------
   Lifecycle: two lanes, one asset handoff
   -------------------------------------------------------------------------- */
.lanes {
    display: grid;
    gap: 16px;
}

.lane {
    position: relative;
    display: grid;
    grid-template-columns: 178px minmax(0, 1fr);
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-2xl);
    box-shadow: var(--sh-sm);
    overflow: hidden;
}

.lane-head {
    padding: 24px;
    background: linear-gradient(160deg, var(--b-50), var(--surface) 82%);
    border-right: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lane--reuse .lane-head {
    background: linear-gradient(160deg, var(--g-50), var(--surface) 82%);
}

.lane-tag {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: 6px;
    height: 24px;
    padding: 0 10px;
    border-radius: var(--r-full);
    background: var(--b-500);
    color: #fff;
    font-size: 11px;
    font-weight: 640;
    letter-spacing: 0.05em;
}

.lane--reuse .lane-tag {
    background: var(--g-500);
}

.lane-head h3 {
    font-size: 19px;
    font-weight: 680;
    letter-spacing: -0.026em;
}

.lane-head p {
    font-size: 12.5px;
    line-height: 1.58;
    color: var(--text-3);
}

.lane-steps {
    display: flex;
    align-items: stretch;
    overflow-x: auto;
    scroll-snap-type: x proximity;
}

.lane-step {
    position: relative;
    flex: 1 1 0;
    min-width: 168px;
    padding: 24px 20px 24px 22px;
    scroll-snap-align: start;
}

.lane-step + .lane-step::before {
    content: "";
    position: absolute;
    left: 0;
    top: 26px;
    bottom: 26px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--line-strong) 22%, var(--line-strong) 78%, transparent);
}

.lane-step .n {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 8px;
    background: var(--surface-2);
    border: 1px solid var(--line-strong);
    font-size: 11.5px;
    font-weight: 660;
    color: var(--text-3);
    font-variant-numeric: tabular-nums;
}

.lane--train .lane-step .n {
    background: var(--b-50);
    border-color: var(--b-200);
    color: var(--b-700);
}

.lane--reuse .lane-step .n {
    background: var(--g-50);
    border-color: var(--g-200);
    color: var(--g-700);
}

.lane-step h4 {
    margin: 12px 0 5px;
    font-size: 14.5px;
    font-weight: 640;
    letter-spacing: -0.018em;
}

.lane-step p {
    font-size: 12.5px;
    line-height: 1.58;
    color: var(--text-3);
}

/* The asset that hands off between lanes */
.handoff {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--r-lg);
    background: linear-gradient(100deg, var(--b-600), var(--b-700) 46%, var(--g-700));
    color: #fff;
    box-shadow: var(--sh-md);
}

.handoff svg {
    flex: none;
    opacity: 0.9;
}

.handoff b {
    font-size: 14px;
    font-weight: 640;
    letter-spacing: -0.016em;
}

.handoff span {
    font-size: 12.5px;
    color: rgba(255, 255, 255, 0.76);
    line-height: 1.5;
}

.handoff code {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
}

/* --------------------------------------------------------------------------
   Feature grid
   -------------------------------------------------------------------------- */
.feat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(258px, 1fr));
    gap: 16px;
}

.feat {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feat-icon {
    width: 40px;
    height: 40px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    background: linear-gradient(160deg, var(--b-50), var(--surface));
    border: 1px solid var(--b-100);
    color: var(--b-600);
    flex: none;
}

.feat--good .feat-icon {
    background: linear-gradient(160deg, var(--g-50), var(--surface));
    border-color: var(--g-100);
    color: var(--g-600);
}

.feat h3 {
    font-size: 16.5px;
    font-weight: 660;
    letter-spacing: -0.022em;
}

.feat p {
    font-size: 13.5px;
    line-height: 1.66;
    color: var(--text-2);
    flex: 1;
}

.feat .chip {
    align-self: flex-start;
}

/* --------------------------------------------------------------------------
   Engine evidence
   -------------------------------------------------------------------------- */
.engine {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: center;
}

.matrix-frame {
    position: relative;
    padding: 12px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-2xl);
    box-shadow: var(--sh-lg);
}

.matrix-frame img {
    width: 100%;
    border-radius: var(--r-lg);
    background: #fff;
}

.matrix-cap {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 6px 4px;
    font-size: 12px;
    color: var(--text-3);
}

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

.engine-item {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 14px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    background: var(--surface);
    transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease),
        transform var(--t) var(--ease-out);
}

.engine-item:hover {
    border-color: var(--accent-line);
    box-shadow: var(--sh-md);
    transform: translateX(2px);
}

.engine-item .ei-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    background: var(--surface-2);
    border: 1px solid var(--line);
    color: var(--b-600);
}

.engine-item h4 {
    font-size: 14.5px;
    font-weight: 640;
    letter-spacing: -0.018em;
    margin-bottom: 4px;
}

.engine-item p {
    font-size: 13px;
    line-height: 1.62;
    color: var(--text-2);
}

/* --------------------------------------------------------------------------
   Orchestration timeline
   -------------------------------------------------------------------------- */
.flow {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.flow::before {
    content: "";
    position: absolute;
    left: 26px;
    right: 26px;
    top: 21px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--b-300), var(--b-400) 34%, var(--g-400) 100%);
    opacity: 0.5;
}

.flow-step {
    position: relative;
    padding-top: 58px;
}

.flow-step .marker {
    position: absolute;
    top: 8px;
    left: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: var(--surface);
    border: 2px solid var(--b-400);
    color: var(--b-700);
    font-size: 12px;
    font-weight: 700;
    box-shadow: 0 0 0 5px var(--n-0);
    font-variant-numeric: tabular-nums;
}

.flow-step:last-child .marker {
    border-color: var(--g-400);
    color: var(--g-700);
}

.flow-step h4 {
    font-size: 15.5px;
    font-weight: 660;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.flow-step p {
    font-size: 13.5px;
    line-height: 1.66;
    color: var(--text-2);
}

/* --------------------------------------------------------------------------
   Two-phase roadmap
   -------------------------------------------------------------------------- */
.phases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.phase {
    padding: 26px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.phase-num {
    font-size: 11.5px;
    font-weight: 640;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--b-600);
}

.phase--two .phase-num {
    color: var(--g-600);
}

.phase h3 {
    font-size: 19px;
    font-weight: 680;
    letter-spacing: -0.026em;
}

.phase > p {
    font-size: 14px;
    line-height: 1.68;
    color: var(--text-2);
}

.phase ul {
    display: grid;
    gap: 9px;
    margin-top: 2px;
}

.phase li {
    display: grid;
    grid-template-columns: 18px minmax(0, 1fr);
    gap: 9px;
    align-items: start;
    font-size: 13.5px;
    line-height: 1.6;
    color: var(--text-2);
}

.phase li svg {
    margin-top: 3px;
    color: var(--g-500);
    flex: none;
}

/* --------------------------------------------------------------------------
   Closing CTA
   -------------------------------------------------------------------------- */
.cta-band {
    position: relative;
    overflow: hidden;
    border-radius: var(--r-3xl);
    background: linear-gradient(150deg, #0e1d33 0%, #0b1420 46%, #08131f 100%);
    padding: clamp(30px, 4.4vw, 56px);
    box-shadow: 0 40px 90px -34px rgba(9, 18, 33, 0.6);
}

.cta-band::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(620px 300px at 88% -10%, rgba(47, 107, 255, 0.36), transparent 62%),
        radial-gradient(520px 280px at 6% 108%, rgba(31, 198, 137, 0.26), transparent 66%);
    pointer-events: none;
}

.cta-band-inner {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
    align-items: center;
}

.cta-band h2 {
    color: #fff;
    font-size: clamp(24px, 3vw, 36px);
    letter-spacing: -0.032em;
    line-height: 1.14;
}

.cta-band p {
    margin-top: 12px;
    max-width: 620px;
    font-size: 15px;
    line-height: 1.7;
    color: rgba(226, 235, 248, 0.72);
}

.cta-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 218px;
}

.cta-actions .btn {
    justify-content: space-between;
}

.btn-onDark {
    --btn-bg: rgba(255, 255, 255, 0.07);
    --btn-fg: #eaf1fb;
    --btn-line: rgba(148, 174, 214, 0.26);
    --btn-shadow: none;
}

.btn-onDark:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.13);
    border-color: rgba(148, 174, 214, 0.42);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.foot {
    border-top: 1px solid var(--line);
    margin-top: clamp(46px, 6vw, 84px);
    padding-block: 30px 44px;
}

.foot-inner {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 32px;
    align-items: center;
    justify-content: space-between;
}

.foot-note {
    font-size: 12.5px;
    line-height: 1.62;
    color: var(--text-3);
    max-width: 640px;
}

.foot-links {
    display: flex;
    gap: 18px;
    font-size: 12.5px;
    color: var(--text-3);
}

.foot-links a:hover {
    color: var(--b-600);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
    .hero-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero-visual {
        order: -1;
        max-width: 620px;
    }

    .engine {
        grid-template-columns: minmax(0, 1fr);
    }

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

    .flow::before {
        display: none;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .nav-links.compact {
        display: flex;
    }

    .brand-sub {
        display: none;
    }

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

    .lane {
        grid-template-columns: minmax(0, 1fr);
    }

    .lane-head {
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .lane-steps {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        overflow-x: visible;
    }

    .lane-step {
        min-width: 0;
        padding: 18px 16px;
    }

    .lane-step + .lane-step::before {
        display: none;
    }

    .lane-step + .lane-step {
        border-top: 1px solid var(--line);
    }

    .lane-step:nth-child(2n) {
        border-left: 1px solid var(--line);
    }

    .lane-step:nth-child(2) {
        border-top: 0;
    }

    .cta-band-inner {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (max-width: 620px) {
    .flow {
        grid-template-columns: minmax(0, 1fr);
    }

    .proof-inner {
        grid-template-columns: minmax(0, 1fr);
    }

    .nav-cta .btn:first-child {
        display: none;
    }

    .hero-actions .btn {
        flex: 1 1 100%;
    }
}

/* 证据台账：替代原先那张与 11 类口径不符的混淆矩阵图。
   每一行都是可以在仓库里逐条核对的事实，投影下也读得清。 */
.evidence-ledger {
    list-style: none;
    margin: 0;
    padding: 2px 6px;
}

.evidence-ledger li {
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr) auto;
    gap: 14px;
    align-items: baseline;
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
}

.evidence-ledger li:last-child {
    border-bottom: 0;
}

.el-k {
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--text-3);
}

.el-v {
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-2);
}

.el-v code {
    font-family: var(--font-mono);
    font-size: 12px;
}

.el-n {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}