/* =========================================================================
   TheSSS AI — homepage
   ========================================================================= */

/* --- Hero ------------------------------------------------------------------ */
.hero {
    position: relative;
    padding-block: clamp(3rem, 1.5rem + 5vw, 6rem) var(--space-2);
    overflow: hidden;
    isolation: isolate;
}

/* Blueprint grid, fading out towards the edges */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(var(--color-grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: center top;
    -webkit-mask-image: radial-gradient(ellipse 75% 70% at 65% 35%, #000 20%, transparent 75%);
    mask-image: radial-gradient(ellipse 75% 70% at 65% 35%, #000 20%, transparent 75%);
}

.hero__inner {
    display: grid;
    gap: var(--space-8);
    align-items: center;
}

.hero__copy {
    display: grid;
    gap: var(--space-5);
    justify-items: start;
}

.hero__title {
    font-size: clamp(2.5rem, 1.3rem + 5vw, 5.25rem);
    font-weight: var(--weight-black);
    line-height: 0.98;
    letter-spacing: -0.03em;
}

.hero__title span {
    display: block;
    width: fit-content; /* gradient spans the words, not the column */
    padding-bottom: 0.06em; /* keeps descenders inside the gradient clip */
}

.hero__lede {
    max-width: 35rem;
    font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
    color: var(--color-text-muted);
}

.hero__lede strong {
    color: var(--color-text);
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.hero__notes {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-5);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.hero__notes li {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

.hero__notes .icon {
    width: 1rem;
    height: 1rem;
    color: var(--color-accent);
    stroke-width: 2.5;
}

@media (max-width: 479.98px) {
    .hero__actions .btn {
        flex: 1 1 100%;
    }
}

@media (min-width: 1024px) {
    .hero__inner {
        grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
        gap: var(--space-6);
    }
}

.hero .stats {
    margin-top: clamp(3rem, 2rem + 4vw, 5rem);
}

/* --- Hero visual: the foundation stack ---------------------------------------
   The SVG (viewBox 300×400) draws five isometric slabs; the HTML labels sit in
   a second column and are placed at each slab's height with --y (in SVG units,
   0–400), so they stay aligned at any size. --i orders the entrance animation
   from the bottom slab up. */
.stack {
    --art-w: clamp(150px, 40vw, 290px);
    --stack-gap: clamp(1rem, 3vw, 2rem);
    position: relative;
    isolation: isolate;
    display: grid;
    grid-template-columns: var(--art-w) minmax(0, 1fr);
    column-gap: var(--stack-gap);
    width: 100%;
    max-width: 540px;
    margin-inline: auto;
}

.stack::before {
    content: "";
    position: absolute;
    z-index: -1;
    top: 5%;
    left: -12%;
    width: calc(var(--art-w) * 1.25);
    aspect-ratio: 1;
    background:
        radial-gradient(circle at 50% 30%, rgba(247, 44, 143, 0.28), transparent 60%),
        radial-gradient(circle at 45% 75%, rgba(99, 102, 241, 0.32), transparent 60%);
    filter: blur(28px);
}

.stack__art {
    width: 100%;
    height: auto;
    overflow: visible;
}

/* Slightly translucent, like the logo, so lower motifs show through */
.stack__slab {
    opacity: 0.86;
    animation: slab-drop var(--duration-slow) var(--ease-out) both;
    animation-delay: calc(var(--i) * 120ms + 100ms);
}

.slab__top {
    fill: var(--top);
    stroke: rgba(255, 255, 255, 0.55);
    stroke-width: 1;
}

.slab__left {
    fill: var(--left);
}

.slab__right {
    fill: var(--right);
}

.slab__motif {
    fill: none;
    stroke: #fff;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
    opacity: 0.8;
    vector-effect: non-scaling-stroke;
}

.slab__motif .solid {
    fill: rgba(255, 255, 255, 0.55);
    stroke: none;
}

/* Hides the strokes behind it (front page of the docs motif) */
.slab__motif .occlude {
    fill: var(--top);
}

.stack__labels {
    position: relative;
}

.stack__label {
    position: absolute;
    top: calc(var(--y) / 400 * 100%);
    left: 0;
    right: 0;
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: var(--space-2);
    align-items: baseline;
    margin-top: -0.65rem;
    animation: label-in 600ms var(--ease-out) both;
    animation-delay: calc(var(--i) * 120ms + 450ms);
}

/* Leader line from the slab's outer corner to the label */
.stack__label::before {
    content: "";
    position: absolute;
    top: 0.65rem;
    right: calc(100% + 6px);
    width: calc(var(--art-w) * 0.1 + var(--stack-gap) - 6px);
    border-top: 1px dashed var(--color-border-strong);
}

.stack__num {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    color: var(--color-accent);
}

.stack__name {
    font-family: var(--font-display);
    font-size: clamp(0.875rem, 0.8rem + 0.35vw, 1.0625rem);
    font-weight: var(--weight-bold);
    line-height: 1.3;
    letter-spacing: -0.01em;
}

.stack__detail {
    grid-column: 2;
    font-size: var(--text-sm);
    line-height: 1.4;
    color: var(--color-text-muted);
}

@media (max-width: 479.98px) {
    .stack__detail {
        display: none;
    }
}

@keyframes slab-drop {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
}

@keyframes label-in {
    from {
        opacity: 0;
        transform: translateX(-10px);
    }
}

/* --- How it works: steps on a rail --------------------------------------------- */
.steps {
    --marker: 44px;
    --steps-gap: var(--space-6);
    position: relative;
    display: grid;
    gap: var(--steps-gap);
}

/* The rail: vertical on mobile, horizontal from lg */
.steps::before {
    content: "";
    position: absolute;
    top: calc(var(--marker) / 2);
    bottom: calc(var(--marker) / 2);
    left: calc(var(--marker) / 2);
    width: 1px;
    background: linear-gradient(var(--brand-pink), var(--brand-violet), var(--brand-indigo));
    opacity: 0.45;
}

.step {
    position: relative;
    padding-left: calc(var(--marker) + var(--space-4));
}

.step__marker {
    position: absolute;
    top: 0;
    left: 0;
    display: grid;
    place-items: center;
    width: var(--marker);
    height: var(--marker);
    border: 1px solid var(--color-border-strong);
    border-radius: 50%;
    background: var(--color-surface);
    box-shadow: 0 0 0 6px var(--color-bg);
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-accent);
}

.step .card {
    height: 100%;
    gap: var(--space-4);
}

.step__head {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.step p {
    color: var(--color-text-muted);
}

.step .check-list {
    margin-top: auto;
    padding-top: var(--space-4);
    border-top: 1px dashed var(--color-border);
}

.steps-footer {
    margin-top: var(--space-6);
    text-align: center;
}

@media (min-width: 1024px) {
    .steps {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .steps::before {
        bottom: auto;
        right: calc((100% - 2 * var(--steps-gap)) / 3 - var(--marker) / 2);
        width: auto;
        height: 1px;
        background: linear-gradient(90deg, var(--brand-pink), var(--brand-violet), var(--brand-indigo));
    }

    .step {
        padding-left: 0;
        padding-top: calc(var(--marker) + var(--space-5));
    }
}

/* --- Impact -------------------------------------------------------------------- */
.impact-grid {
    display: grid;
    gap: var(--space-5);
}

.impact-card {
    gap: var(--space-4);
    padding: clamp(1.5rem, 1rem + 1.5vw, 2.25rem);
}

.impact-card__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.impact-card h3 {
    font-size: var(--text-xl);
}

.impact-card p {
    color: var(--color-text-muted);
}

.impact-card .check-list {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
    margin-top: auto;
    padding-top: var(--space-4);
    border-top: 1px dashed var(--color-border);
}

@media (min-width: 768px) {
    .impact-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

.bottom-line {
    display: grid;
    gap: var(--space-6);
    margin-top: var(--space-5);
    padding: clamp(1.75rem, 1rem + 2.5vw, 3rem);
    border: 1px solid var(--color-border); /* separates it from a dark page */
    border-radius: var(--radius-xl);
    background:
        radial-gradient(70% 120% at 100% 0%, rgba(214, 58, 196, 0.22), transparent 60%),
        radial-gradient(60% 120% at 0% 100%, rgba(99, 102, 241, 0.25), transparent 60%),
        #100d22;
    color: var(--color-text);
}

.bottom-line__statement {
    display: grid;
    gap: var(--space-3);
    align-content: start;
}

.bottom-line__statement p:last-child {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: var(--weight-bold);
    line-height: 1.1;
    letter-spacing: -0.03em;
}

.outcomes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5);
}

.outcome {
    display: grid;
    gap: var(--space-1);
    padding-left: var(--space-4);
    border-left: 2px solid var(--brand-pink);
}

.outcome:nth-child(2) {
    border-color: var(--brand-magenta);
}

.outcome:nth-child(3) {
    border-color: var(--brand-violet);
}

.outcome:nth-child(4) {
    border-color: var(--brand-indigo);
}

.outcome h3 {
    font-size: var(--text-base);
}

.outcome p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

@media (min-width: 1024px) {
    .bottom-line {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        gap: var(--space-8);
        align-items: center;
    }

    .outcomes {
        gap: var(--space-6) var(--space-5);
    }
}

/* --- Demo video ---------------------------------------------------------------- */
.demo {
    display: grid;
    gap: var(--space-7);
    align-items: center;
}

.demo__copy {
    display: grid;
    gap: var(--space-4);
    justify-items: start;
}

.demo__lede {
    font-size: var(--text-md);
    color: var(--color-text-muted);
}

.demo__copy .btn {
    margin-top: var(--space-3);
}

@media (min-width: 1024px) {
    .demo {
        grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
        gap: var(--space-8);
    }
}

/* --- Features ------------------------------------------------------------------ */
.feature-grid {
    display: grid;
    gap: var(--space-4);
}

.feature-card h3 {
    margin-top: var(--space-2);
    font-size: var(--text-lg);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

.feature-card .link-arrow {
    margin-top: auto;
    padding-top: var(--space-2);
    color: var(--color-accent);
    font-size: var(--text-sm);
}

.feature-card .tag {
    position: absolute;
    top: var(--space-5);
    right: var(--space-5);
}

/* Phones: icon beside the text keeps nine cards from becoming a long scroll */
@media (max-width: 639.98px) {
    .feature-card {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
        align-content: start;
        gap: var(--space-2) var(--space-4);
        padding: var(--space-4) var(--space-5) var(--space-5) var(--space-4);
    }

    .feature-card > * {
        grid-column: 2;
    }

    .feature-card > .icon-tile {
        grid-column: 1;
        grid-row: 1 / span 2;
    }

    .feature-card h3 {
        margin-top: 0;
        align-self: center;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .feature-card .tag {
        position: static;
        justify-self: start;
    }
}

/* Gradient hairline border for the highlighted card */
.feature-card--highlight {
    border-color: transparent;
    background:
        linear-gradient(var(--color-surface), var(--color-surface)) padding-box,
        var(--gradient-brand) border-box;
}

@media (min-width: 640px) {
    .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}