/* ============================================================
   Sharp AI Hub — Design tokens & styles
   Dark mode · Ink / Indigo-Violet colorway
   ============================================================ */

:root {
  /* ---- Color: surfaces ---- */
  --color-bg:            #0B0B16;
  --color-surface:       #14141E;
  --color-surface-2:     #191926;
  --color-footer:        #0C0C17;

  /* ---- Color: brand ---- */
  --color-accent:        #6B4AFA;
  --color-accent-hover:  #7C5CFC;
  --color-accent-light:  #A593FF;
  --color-accent-soft:   rgba(124, 92, 252, 0.12);
  --color-accent-border: rgba(124, 92, 252, 0.28);

  /* ---- Color: text ---- */
  --color-text:          #ECECF1;
  --color-text-muted:    #9092A2;
  --color-text-subtle:   #6E6F7E;
  --color-heading:       #FFFFFF;
  --color-star:          #F6C56B;

  /* ---- Color: lines ---- */
  --color-border:        rgba(255, 255, 255, 0.07);
  --color-border-strong: rgba(255, 255, 255, 0.16);
  --color-overlay:       rgba(11, 11, 22, 0.72);

  /* ---- Typography ---- */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                  Helvetica, Arial, sans-serif;

  --text-xs:   0.78rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.625rem;
  --text-hero: clamp(2.25rem, 5.5vw, 3.75rem);

  --weight-regular: 400;
  --weight-medium:  500;
  --weight-bold:    700;

  /* ---- Spacing scale (4px base) ---- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* ---- Radius & effects ---- */
  --radius-sm: 6px;
  --radius-md: 9px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3);
  --container: 1200px;
  --transition: 0.18s ease;
}

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 500 700;
  font-display: optional;
  src: local("Space Grotesk"),
       url("/fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 500 700;
  font-display: optional;
  src: local("Space Grotesk"),
       url("/fonts/space-grotesk-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ============================================================
   Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(124, 92, 252, 0.35); }

a { color: inherit; }

img, svg { display: block; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--space-5);
}

.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;
}

/* ============================================================
   Brand mark
   ============================================================ */
.brand { display: inline-flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.brand__word {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  letter-spacing: -0.01em;
  color: var(--color-heading);
  white-space: nowrap;
}
.brand__word .ai  { color: var(--color-accent-light); }
.brand__word .hub { color: var(--color-text-muted); font-weight: var(--weight-medium); }

/* ============================================================
   Navbar
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-overlay);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex; align-items: center; gap: var(--space-5);
  height: 64px;
}
.site-header .brand__word { font-size: var(--text-lg); }

.nav { display: flex; gap: var(--space-1); margin-left: var(--space-2); }
.nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: #C7C8D2; text-decoration: none;
  font-size: var(--text-sm); font-weight: var(--weight-medium);
  transition: background var(--transition), color var(--transition);
}
.nav__link:hover { background: rgba(255,255,255,0.06); color: var(--color-heading); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-4); }

.lang {
  display: flex; gap: 2px; padding: 3px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
}
.lang__btn {
  padding: 5px 10px; border: none; cursor: pointer;
  border-radius: 7px; font: var(--weight-bold) var(--text-xs)/1 var(--font-body);
  background: transparent; color: #9596A6;
  transition: background var(--transition), color var(--transition);
}
.lang__btn[aria-pressed="true"] { background: var(--color-accent); color: #fff; }

/* ---- Buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600; text-decoration: none; cursor: pointer;
  border-radius: var(--radius-md); transition: background var(--transition), border-color var(--transition);
}
.btn--primary { background: var(--color-accent); color: #fff; border: none; padding: 9px 16px; font-size: var(--text-sm); }
.btn--primary:hover { background: var(--color-accent-hover); }
.btn--primary-lg { padding: 13px 24px; font-size: 0.95rem; border-radius: 11px; }
.btn--ghost {
  color: var(--color-text); background: transparent;
  border: 1px solid var(--color-border-strong); padding: 13px 24px;
  font-size: 0.95rem; border-radius: 11px;
}
.btn--ghost:hover { border-color: rgba(255,255,255,0.32); background: rgba(255,255,255,0.03); }

/* ============================================================
   Hero
   ============================================================ */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid rgba(255,255,255,0.06); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(58% 80% at 50% -12%, rgba(124,92,252,0.20), transparent 68%);
}
.hero__inner { position: relative; max-width: 860px; margin: 0 auto; padding: var(--space-9) var(--space-5) 5.4rem; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600;
  color: #B9A8FF; background: var(--color-accent-soft);
  border: 1px solid var(--color-accent-border);
  padding: 6px 14px; border-radius: var(--radius-pill);
}
.hero__title {
  font-family: var(--font-display); font-weight: var(--weight-bold);
  font-size: var(--text-hero); line-height: 1.04; letter-spacing: -0.025em;
  margin: var(--space-5) 0 0; color: var(--color-heading); text-wrap: balance;
}
.hero__sub {
  margin: var(--space-5) auto 0; max-width: 600px;
  font-size: var(--text-lg); line-height: 1.6; color: #9EA0B0; text-wrap: pretty;
}
.hero__actions { display: flex; gap: var(--space-3); justify-content: center; margin-top: var(--space-6); flex-wrap: wrap; }

/* ============================================================
   Articles
   ============================================================ */
.section { max-width: var(--container); margin: 0 auto; padding: var(--space-8) var(--space-5) var(--space-8); }
.section__head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; }
.section__title { font-family: var(--font-display); font-size: var(--text-xl); font-weight: var(--weight-bold); letter-spacing: -0.02em; color: var(--color-heading); margin: 0; }
.link-accent { font-size: var(--text-sm); font-weight: 600; color: var(--color-accent-light); text-decoration: none; }

.card-grid {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: var(--space-5);
}

.card {
  display: flex; flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover { border-color: rgba(124,92,252,0.55); transform: translateY(-3px); }

.card__media {
  position: relative; height: 158px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-surface-2);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.card__mono { font-family: var(--font-display); font-weight: var(--weight-bold); font-size: 3.5rem; color: rgba(255,255,255,0.12); }
.card__rating {
  position: absolute; top: 12px; right: 12px;
  display: inline-flex; align-items: center; gap: 4px;
  background: rgba(11,11,22,0.66); backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--color-star); font-size: var(--text-xs); font-weight: 600;
  padding: 4px 9px; border-radius: var(--radius-pill);
}
.card__body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.chip {
  align-self: flex-start;
  font-size: 0.69rem; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--color-accent-light); background: rgba(124,92,252,0.1);
  padding: 4px 9px; border-radius: var(--radius-sm);
}
.card__title { font-family: var(--font-display); font-weight: var(--weight-bold); font-size: 1.16rem; line-height: 1.3; letter-spacing: -0.01em; color: var(--color-heading); margin: 0; }
.card__excerpt { font-size: 0.9rem; line-height: 1.55; color: var(--color-text-muted); margin: 0; flex: 1; text-wrap: pretty; }
.card__foot {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding-top: var(--space-4); border-top: 1px solid rgba(255,255,255,0.06);
}
.card__meta { font-size: var(--text-xs); color: var(--color-text-muted); }
.card__link { font-size: 0.81rem; font-weight: 600; color: var(--color-accent-light); text-decoration: none; white-space: nowrap; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { border-top: 1px solid var(--color-border); background: var(--color-footer); }
.site-footer__inner {
  display: grid; grid-template-columns: 1.7fr 1fr 1fr 1.3fr; gap: var(--space-7);
  padding: 3.5rem var(--space-5) var(--space-6);
}
.site-footer .brand__word { font-size: 1.06rem; }
.footer__tagline { margin: var(--space-4) 0 0; font-size: var(--text-sm); line-height: 1.55; color: #8A8B9B; max-width: 280px; }
.footer__col-title { font-family: var(--font-display); font-size: 0.81rem; font-weight: 600; color: var(--color-heading); letter-spacing: 0.02em; margin: 0 0 var(--space-4); }
.footer__link { display: block; font-size: var(--text-sm); color: #8A8B9B; text-decoration: none; margin-bottom: 9px; }
.footer__link:hover { color: var(--color-text); }

.newsletter { display: flex; gap: var(--space-2); }
.newsletter input {
  flex: 1; min-width: 0;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-md); padding: 10px 12px;
  color: var(--color-text); font-size: var(--text-sm); font-family: inherit; outline: none;
}
.newsletter input:focus { outline: 2px solid rgba(124,92,252,0.6); outline-offset: -1px; }

.site-footer__bottom { border-top: 1px solid rgba(255,255,255,0.06); }
.site-footer__bottom-inner {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap;
  padding: var(--space-4) var(--space-5);
}
.copyright, .locales { font-size: var(--text-sm); color: var(--color-text-subtle); }
.locales { letter-spacing: 0.04em; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 860px) {
  .nav { display: none; }
  .site-footer__inner { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .hero__inner { padding-top: var(--space-8); }
}
@media (max-width: 520px) {
  .card-grid { grid-template-columns: 1fr; }
  .site-footer__inner { grid-template-columns: 1fr; }
}

/* =====================================================================
   Sharp AI Hub — style.v2.css ADDITIONS / OVERRIDES
   ===================================================================== */

:root {
  --sah-bg:        var(--color-bg, #0B0B16);
  --sah-accent:    var(--color-accent, #7C5CFC);
  --sah-accent-2:  #a78bfa;
  --sah-ink:       var(--color-text, #ECECF3);
  --sah-muted:     var(--color-text-muted, #9A9AAE);
  --sah-card:      var(--color-surface, #14141E);
  --sah-line:      var(--color-border, rgba(255,255,255,.08));

  --sah-grad-writing:      linear-gradient(135deg, #4f46e5, #7c3aed);
  --sah-grad-seo:          linear-gradient(135deg, #059669, #0d9488);
  --sah-grad-design:       linear-gradient(135deg, #7c3aed, #a855f7);
  --sah-grad-productivity: linear-gradient(135deg, #d97706, #f59e0b);
  --sah-grad-security:     linear-gradient(135deg, #1d4ed8, #3b82f6);
  --sah-grad-video:        linear-gradient(135deg, #e11d48, #f97316);
  --sah-grad-default:      linear-gradient(135deg, #4f46e5, #7c3aed);
}

/* 1. HERO */
.hero { position: relative; isolation: isolate; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute; inset: 0; z-index: -2;
  background-image: radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 40%, transparent 100%);
          mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 40%, transparent 100%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute; z-index: -1;
  top: -80px; left: 50%;
  width: min(900px, 90vw); aspect-ratio: 1;
  transform: translateX(-50%);
  background: radial-gradient(circle at 50% 50%, rgba(124,92,252,.28) 0%, rgba(124,92,252,.10) 42%, transparent 70%);
  pointer-events: none;
}
.hero h1, .hero__title {
  letter-spacing: -0.03em; line-height: 1.02;
  font-size: clamp(2.75rem, 6.5vw, 5.25rem);
  text-wrap: balance;
}
.hero .grad, .hero__title .grad {
  background: linear-gradient(120deg, var(--sah-accent), var(--sah-accent-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* Trust bar */
.trust-bar { display: flex; flex-direction: column; align-items: center; gap: 14px; margin-top: 56px; }
.trust-bar__label { font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--sah-muted); opacity: .8; }
.trust-bar ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px 32px; }
.trust-bar li { font-weight: 600; font-size: .95rem; letter-spacing: -0.01em; color: var(--sah-muted); opacity: .55; transition: opacity .2s ease; }
.trust-bar li:hover { opacity: .9; }

/* 2. CARDS */
.card { border: 1px solid var(--sah-line); border-radius: 16px; background: var(--sah-card); overflow: hidden; transition: transform .25s cubic-bezier(.2,.7,.3,1), box-shadow .25s ease; }
.card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px -16px rgba(0,0,0,.65), 0 0 0 1px rgba(124,92,252,.40); }
.card__media { position: relative; height: 200px; display: flex; align-items: center; justify-content: center; background: var(--sah-grad-default); overflow: hidden; }
.card[data-category="ai-writing"] .card__media, .card__media[data-category="ai-writing"] { background: var(--sah-grad-writing); }
.card[data-category="seo"] .card__media, .card__media[data-category="seo"] { background: var(--sah-grad-seo); }
.card[data-category="design"] .card__media, .card__media[data-category="design"] { background: var(--sah-grad-design); }
.card[data-category="productivity"] .card__media, .card__media[data-category="productivity"] { background: var(--sah-grad-productivity); }
.card[data-category="security"] .card__media, .card__media[data-category="security"] { background: var(--sah-grad-security); }
.card[data-category="video"] .card__media, .card__media[data-category="video"] { background: var(--sah-grad-video); }
.card__media::after { content: ""; position: absolute; inset: 0; background: radial-gradient(120% 90% at 20% 0%, rgba(255,255,255,.12), transparent 55%); pointer-events: none; }
.card__initial { font-size: 5rem; font-weight: 700; line-height: 1; color: rgba(255,255,255,.18); letter-spacing: -0.04em; user-select: none; }
.card__logo { position: absolute; top: 14px; left: 14px; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; font-size: .95rem; font-weight: 700; color: #fff; background: linear-gradient(135deg, rgba(255,255,255,.28), rgba(255,255,255,.06)); border: 1px solid rgba(255,255,255,.25); backdrop-filter: blur(4px); }

/* 3. Reading progress bar */
.reading-progress { position: fixed; top: 0; left: 0; z-index: 100; width: 100%; height: 3px; transform: scaleX(0); transform-origin: 0 50%; background: linear-gradient(90deg, var(--sah-accent), var(--sah-accent-2)); }
@supports (animation-timeline: scroll()) {
  .reading-progress { animation: sah-progress linear both; animation-timeline: scroll(root block); }
}
@keyframes sah-progress { from { transform: scaleX(0); } to { transform: scaleX(1); } }

/* Sidebar */
.article-sidebar { position: sticky; top: 96px; align-self: start; display: flex; flex-direction: column; gap: 24px; max-height: calc(100vh - 120px); overflow-y: auto; }
.toc { font-size: .9rem; }
.toc__title { font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--sah-muted); margin-bottom: 12px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--sah-line); }
.toc a { display: block; padding: 6px 0 6px 14px; margin-left: -1px; color: var(--sah-muted); text-decoration: none; border-left: 2px solid transparent; transition: color .15s ease, border-color .15s ease; }
.toc a:hover, .toc a.is-active { color: var(--sah-ink); border-left-color: var(--sah-accent); }
.top-pick { border: 1px solid var(--sah-line); border-radius: 14px; padding: 18px; background: linear-gradient(180deg, rgba(124,92,252,.10), transparent 60%), var(--sah-card); }
.top-pick__label { font-size: .68rem; letter-spacing: .14em; text-transform: uppercase; color: var(--sah-accent-2); margin-bottom: 8px; }

/* 5. FOOTER fade */
.site-footer, footer { position: relative; }
.site-footer::before, footer::before { content: ""; position: absolute; left: 0; right: 0; top: -120px; height: 120px; pointer-events: none; background: linear-gradient(to bottom, transparent, var(--sah-bg)); }

/* =====================================================================
   Category filter bar (blog index pages)
   ===================================================================== */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 1.5rem 0 2rem;
}
.filter-btn {
  padding: 6px 16px; border-radius: 20px; cursor: pointer;
  font-size: .82rem; font-weight: 600; letter-spacing: .02em;
  border: 1px solid var(--color-border, rgba(255,255,255,.1));
  background: transparent; color: var(--color-text-muted, #9A9AAE);
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.filter-btn:hover { color: var(--color-heading, #fff); border-color: rgba(255,255,255,.25); }
.filter-btn.active {
  background: var(--color-accent, #7C5CFC);
  border-color: var(--color-accent, #7C5CFC);
  color: #fff;
}
.article-card.hidden { display: none; }

/* =====================================================================
   Subscribe section (home body)
   ===================================================================== */
.subscribe-section {
  margin: 5rem 0;
  padding: 56px 40px;
  border-radius: 20px;
  background: linear-gradient(135deg, rgba(124,92,252,.18) 0%, rgba(167,139,250,.08) 100%);
  border: 1px solid rgba(124,92,252,.25);
  text-align: center;
  position: relative; overflow: hidden;
}
.subscribe-section::before {
  content: "";
  position: absolute; inset: 0; z-index: 0;
  background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
}
.subscribe-section > * { position: relative; z-index: 1; }
.subscribe-section__eyebrow {
  font-size: .72rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--color-accent, #7C5CFC); margin-bottom: 12px;
}
.subscribe-section__title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700; letter-spacing: -.02em; line-height: 1.15;
  color: var(--color-heading, #fff); margin-bottom: 12px;
}
.subscribe-section__sub {
  font-size: 1rem; color: var(--color-text-muted, #9A9AAE);
  max-width: 480px; margin: 0 auto 28px; line-height: 1.65;
}
.subscribe-form {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  max-width: 420px; margin: 0 auto;
}
.subscribe-form input[type="email"] {
  flex: 1; min-width: 220px; padding: 12px 16px;
  border-radius: 10px; font-size: .95rem;
  border: 1px solid var(--color-border, rgba(255,255,255,.12));
  background: rgba(255,255,255,.06); color: var(--color-text, #ECECF3);
  outline: none; transition: border-color .15s ease;
}
.subscribe-form input[type="email"]:focus { border-color: var(--color-accent, #7C5CFC); }
.subscribe-form input[type="email"]::placeholder { color: var(--color-text-muted, #9A9AAE); }
.subscribe-form button {
  padding: 12px 24px; border-radius: 10px; border: none; cursor: pointer;
  font-size: .95rem; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--color-accent, #7C5CFC), #6d4cf0);
  transition: transform .15s ease, box-shadow .15s ease;
}
.subscribe-form button:hover { transform: translateY(-1px); box-shadow: 0 8px 20px -8px rgba(124,92,252,.7); }
.subscribe-note { font-size: .75rem; color: var(--color-text-muted, #9A9AAE); margin-top: 12px; }