/* ==========================================================================
   main.css — global chrome & components for withkeshav.com
   All values reference tokens.css. Nothing hardcoded.
   ========================================================================== */

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: var(--fs-body);
    font-weight: var(--fw-regular);
    line-height: var(--lh-body);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background-color var(--dur-mid) var(--ease-brand),
        color var(--dur-mid) var(--ease-brand);
}

img,
svg,
video {
    display: block;
    max-width: 100%;
}

img {
    height: auto;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
    margin: 0 0 var(--space-md);
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    line-height: var(--lh-heading);
    letter-spacing: -0.015em;
    color: var(--color-text-primary);
    text-wrap: balance;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: var(--fw-semibold); }
h4 { font-size: var(--fs-h4); font-weight: var(--fw-semibold); }

p {
    margin: 0 0 var(--paragraph-gap);
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

/* Body links: underlined. */
.prose a,
.rich-text a {
    text-decoration: underline;
    text-underline-offset: 0.15em;
    text-decoration-thickness: 1px;
}

.prose a:hover,
.rich-text a:hover,
a:hover {
    color: var(--color-accent-hover);
}

strong { font-weight: var(--fw-semibold); }

code, pre, kbd, samp {
    font-family: var(--font-mono);
    font-size: var(--fs-code);
}

::selection {
    background: var(--color-accent);
    color: var(--color-selection-fg);
}

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-md);
}

.site-main {
    flex: 1 0 auto;
}

.reading {
    max-width: var(--reading-max);
    margin-inline: auto;
}

.section {
    padding-block: var(--space-section);
}

.section--tight {
    padding-block: var(--space-2xl);
}

.section__head {
    margin-bottom: var(--space-2xl);
}

.section__sub {
    max-width: var(--reading-measure);
    margin: var(--space-sm) 0 0;
    color: var(--color-text-secondary);
    font-size: var(--fs-h4);
    line-height: 1.5;
}

.eyebrow {
    display: inline-block;
    margin-bottom: var(--space-sm);
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.lede {
    max-width: var(--reading-measure);
    color: var(--color-text-secondary);
    font-size: var(--fs-h4);
    line-height: 1.5;
}

.lede--center {
    margin-inline: auto;
}

.section__more {
    margin-top: var(--space-xl);
}

/* ---------- Accessibility helpers ---------- */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: absolute;
    left: var(--space-md);
    top: -3rem;
    z-index: 100;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: var(--border);
    border-radius: var(--radius-md);
    transition: top var(--dur-fast) var(--ease-brand);
}

.skip-link:focus {
    top: var(--space-md);
}

:focus-visible {
    outline: var(--focus-ring);
    outline-offset: 2px;
    border-radius: var(--radius-base);
}

/* ---------- Header / nav ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--color-surface);
    border-bottom: var(--border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    min-height: 64px;
}

.monogram {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 48px;
    min-height: 48px;
    text-decoration: none;
}

.monogram__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 1.05rem;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-text-primary);
    border-radius: var(--radius-base);
    transition: color var(--dur-fast) var(--ease-brand),
        border-color var(--dur-fast) var(--ease-brand);
}

.monogram:hover .monogram__mark {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.site-nav {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-nav__list a {
    display: inline-flex;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    text-decoration: none;
    transition: color var(--dur-fast) var(--ease-brand);
}

.site-nav__list a:hover,
.site-nav__list a[aria-current="page"] {
    color: var(--color-text-primary);
}

.site-nav__list a[aria-current="page"] {
    text-decoration: underline;
    text-underline-offset: 0.4em;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--color-accent);
}

/* Toggle buttons (nav + theme) share a compact icon-button look */
.nav-toggle,
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    padding: 0;
    color: var(--color-text-secondary);
    background: transparent;
    border: var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: color var(--dur-fast) var(--ease-brand),
        border-color var(--dur-fast) var(--ease-brand);
}

.theme-toggle { margin-left: var(--space-md); }

.nav-toggle:hover,
.theme-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.nav-toggle .icon,
.theme-toggle .icon {
    width: 20px;
    height: 20px;
}

.nav-toggle {
    display: none; /* mobile only */
}

/* nav-toggle icon swap */
.nav-toggle__close { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__open { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__close { display: block; }

/* theme-toggle icon swap: light shows moon (go dark), dark shows sun */
.theme-toggle__sun { display: none; }
html[data-theme="dark"] .theme-toggle__moon { display: none; }
html[data-theme="dark"] .theme-toggle__sun { display: block; }

/* ---------- Footer ---------- */
.site-footer {
    flex-shrink: 0;
    margin-top: var(--space-section);
    background: var(--color-surface);
    border-top: var(--border);
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding-block: var(--space-xl);
}

.site-footer__identity {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: var(--fs-small);
}

.social {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin: 0;
    padding: 0;
    list-style: none;
}

.social__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    transition: color var(--dur-fast) var(--ease-brand);
}

.social__link .icon {
    width: 20px;
    height: 20px;
}

.social__link:hover {
    color: var(--color-accent);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    min-height: 48px;
    padding: 0.65rem 1.25rem;
    font-family: var(--font-sans);
    font-size: var(--fs-small);
    font-weight: var(--fw-semibold);
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    border: var(--border-width) solid transparent;
    border-radius: var(--radius-base);
    cursor: pointer;
    transition: background-color var(--dur-fast) var(--ease-brand),
        border-color var(--dur-fast) var(--ease-brand),
        color var(--dur-fast) var(--ease-brand);
}

.btn .icon { width: 18px; height: 18px; }

.btn--primary {
    background: var(--color-accent);
    color: var(--color-on-accent);
}

.btn--primary:hover {
    background: var(--color-accent-hover);
    color: var(--color-on-accent);
}

.btn--secondary {
    background: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn--secondary:hover {
    color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

/* ---------- Tags / badges ---------- */
.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: var(--fw-medium);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    background: var(--color-surface-tint);
    border: var(--border);
    border-radius: var(--radius-base);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin: 0;
    padding: 0;
    list-style: none;
}

a.tag {
    text-decoration: none;
    color: var(--color-text-secondary);
    transition: border-color var(--dur-fast) var(--ease-brand),
        color var(--dur-fast) var(--ease-brand);
}

a.tag:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.tag--active {
    color: var(--color-text-primary);
    border-color: var(--color-accent);
    background: var(--color-surface);
}

/* ---------- Hero (homepage) ---------- */
.hero {
    padding-block: var(--space-3xl) var(--space-2xl);
}

.hero__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.hero__title {
    margin-bottom: var(--space-lg);
}

.hero__lede {
    max-width: 52ch;
    margin-bottom: var(--space-xl);
    color: var(--color-text-secondary);
    font-size: var(--fs-h4);
    line-height: 1.5;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

/* Static abstract geometric pattern (forensic grid + nodes) */
.hero__visual {
    display: none;
    aspect-ratio: 4 / 3;
    background: var(--color-surface);
    border: var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.hero__visual svg {
    width: 100%;
    height: 100%;
}

.hero__visual .grid-line { stroke: var(--color-border); stroke-width: 1; }
.hero__visual .node { fill: var(--color-accent); }
.hero__visual .node--muted { fill: var(--chart-3); }
.hero__visual .edge { stroke: var(--color-accent); stroke-width: 1.25; opacity: 0.5; }

/* ---------- Post cards / grid ---------- */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.post-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--space-lg);
    background: var(--color-surface);
    border: var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--dur-mid) var(--ease-brand),
        transform var(--dur-mid) var(--ease-brand);
}

.post-card__media {
    display: block;
    margin: calc(var(--space-lg) * -1) calc(var(--space-lg) * -1) var(--space-md);
    overflow: hidden;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    text-decoration: none;
}

.post-card__media img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    filter: saturate(0.85);
    transition: filter var(--dur-mid) var(--ease-brand);
}

.post-card__media:hover img { filter: saturate(1); }

.post-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
}

.post-card__title {
    margin-bottom: var(--space-sm);
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
}

.post-card__title a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.post-card__title a:hover { color: var(--color-accent); }

.post-card__desc {
    margin-bottom: var(--space-lg);
    color: var(--color-text-secondary);
}

.post-card__more {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    margin-top: auto;
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    color: var(--color-accent);
}

.post-card__more .icon { width: 16px; height: 16px; }

.post-card__more:hover { color: var(--color-accent-hover); }

/* Featured post (blog index) */
.featured {
    display: grid;
    gap: var(--space-lg);
    padding: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    background: var(--color-surface);
    border: var(--border);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-md);
}

.featured__label {
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-accent);
}

.featured__title { font-size: var(--fs-h2); }
.featured__title a { color: var(--color-text-primary); }
.featured__title a:hover { color: var(--color-accent); }

/* ---------- Homepage: about strip ---------- */
.about-strip {
    display: grid;
    gap: var(--space-xl);
    padding: var(--space-xl);
    background: var(--color-surface);
    border: var(--border);
    border-radius: var(--radius-md);
}

.about-strip__name {
    margin: 0 0 var(--space-xs);
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
    color: var(--color-text-primary);
}

.about-strip__title {
    margin: 0;
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
}

.about-strip__bio p {
    color: var(--color-text-secondary);
}

.about-strip__bio p:last-child {
    margin-bottom: 0;
}

@media (min-width: 768px) {
    .about-strip {
        grid-template-columns: minmax(12rem, 0.35fr) 1fr;
        gap: var(--space-2xl);
        align-items: start;
    }
}

/* ---------- Homepage: work / tool cards ---------- */
.tool-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--space-lg);
    background: var(--color-surface);
    border: var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--dur-mid) var(--ease-brand);
}

.tool-card:hover {
    border-color: var(--color-accent);
}

.tool-card__label {
    display: inline-block;
    margin-bottom: var(--space-xs);
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
}

.tool-card__name {
    margin: 0 0 var(--space-sm);
    font-size: var(--fs-h3);
    font-weight: var(--fw-semibold);
}

.tool-card__desc {
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
}

.tool-card__status {
    margin: 0 0 var(--space-md);
    font-family: var(--font-mono);
    font-size: var(--fs-small);
    color: var(--color-text-secondary);
}

.tool-card__links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-md);
    margin-top: auto;
}

.tool-card__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    color: var(--color-accent);
}

.tool-card__link .icon {
    width: 16px;
    height: 16px;
}

.tool-card__link:hover {
    color: var(--color-accent-hover);
}

.tool-card__link--muted {
    font-weight: var(--fw-regular);
    color: var(--color-text-secondary);
}

/* ---------- Homepage: On AI belief band ---------- */
.belief {
    position: relative;
    overflow: hidden;
    padding-block: var(--space-section);
    background: var(--color-surface-tint);
    border-block: var(--border);
}

.belief__graphic {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0.16;
    pointer-events: none;
    animation: belief-drift 48s var(--ease-brand) infinite alternate;
}

.belief__graphic svg {
    width: 110%;
    height: 110%;
    margin: -5%;
}

.belief__grid-line {
    stroke: var(--color-border);
    stroke-width: 1;
}

.belief__edge {
    stroke: var(--color-accent);
    stroke-width: 1.25;
    opacity: 0.45;
}

.belief__node {
    fill: var(--color-accent);
}

.belief__node--muted {
    fill: var(--chart-3);
}

.belief__node--pulse {
    transform-box: fill-box;
    transform-origin: center;
    animation: belief-pulse 10s var(--ease-brand) infinite;
}

.belief__inner {
    position: relative;
    z-index: 1;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-md);
}

.belief__inner .eyebrow {
    margin-bottom: var(--space-sm);
}

.belief__inner h2 {
    margin-bottom: var(--space-lg);
}

.belief__body p {
    color: var(--color-text-secondary);
}

.belief__body p:last-child {
    margin-bottom: 0;
}

@keyframes belief-drift {
    from { transform: translate3d(-1.5%, 0, 0); }
    to { transform: translate3d(1.5%, 0, 0); }
}

@keyframes belief-pulse {
    0%, 100% { opacity: 0.55; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.15); }
}

@media (min-width: 768px) {
    .belief__inner {
        padding-inline: var(--space-xl);
    }
}

/* ---------- Subscribe CTA ---------- */
.subscribe {
    padding: var(--space-2xl);
    background: var(--color-surface);
    border: var(--border);
    border-radius: var(--radius-md);
    text-align: center;
}

.subscribe__inner {
    max-width: var(--reading-max);
    margin-inline: auto;
}

.subscribe__form {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
    margin-top: var(--space-lg);
}

/* ---------- Forms ---------- */
.field {
    flex: 1 1 260px;
    min-width: 0;
    min-height: 48px;
    padding: 0.65rem 0.85rem;
    font-family: var(--font-sans);
    font-size: var(--fs-small);
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: var(--border);
    border-radius: var(--radius-base);
    transition: border-color var(--dur-fast) var(--ease-brand);
}

.field:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 1px var(--color-accent);
}

.field::placeholder { color: var(--color-text-secondary); }

/* ---------- Contact ---------- */
.contact__methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.contact__email {
    font-family: var(--font-mono);
    font-size: var(--fs-h4);
}

.contact__email a {
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

/* ==========================================================================
   Mobile menu + responsive
   ========================================================================== */
@media (max-width: 767px) {
    .nav-toggle { display: inline-flex; }

    .site-nav__list {
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-sm) var(--space-md) var(--space-md);
        background: var(--color-surface);
        border-bottom: var(--border);
        transform: translateY(-8px);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--dur-fast) var(--ease-brand),
            transform var(--dur-fast) var(--ease-brand),
            visibility var(--dur-fast) var(--ease-brand);
    }

    .site-header { position: sticky; }
    .site-header__inner { position: relative; }

    .nav-toggle[aria-expanded="true"] + .site-nav__list {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .site-nav__list li { border-top: var(--border); }
    .site-nav__list li:first-child { border-top: 0; }

    .site-nav__list a {
        min-height: 48px;
        width: 100%;
        font-size: var(--fs-body);
    }

    .site-footer__inner {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }

    .hero__actions .btn { flex: 1 1 auto; }
}

@media (min-width: 768px) {
    .container { padding-inline: var(--space-xl); }

    .card-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-xl);
    }

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

@media (min-width: 1200px) {
    .hero__grid {
        grid-template-columns: 1.15fr 0.85fr;
        gap: var(--space-3xl);
    }

    .hero__visual { display: block; }

    .card-grid--2 { grid-template-columns: repeat(2, 1fr); }
    .card-grid--3 { grid-template-columns: repeat(3, 1fr); }
}

/* ==========================================================================
   Motion — scroll reveal (desktop), hover lift, reduced-motion
   ========================================================================== */
.post-card:hover {
    border-color: var(--color-accent);
}

@media (min-width: 768px) and (hover: hover) {
    .post-card:hover {
        transform: translateY(-2px);
    }

    .reveal {
        opacity: 0;
        transform: translateY(12px);
        transition: opacity var(--dur-slow) var(--ease-brand),
            transform var(--dur-slow) var(--ease-brand);
    }

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

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }

    .reveal { opacity: 1 !important; transform: none !important; }

    .belief__graphic,
    .belief__node--pulse {
        animation: none !important;
    }
}