/* ==========================================================================
   Kalkman Digital — design system
   Dark-first, purple accent (#77216F), Inter. Device-bound light mode.
   Inspired by the Cosmoq layout language: deep navy surfaces, soft glows,
   generous spacing, large radii, pill buttons.
   ========================================================================== */

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
ul { list-style: none; }

/* ---- TOKENS: DARK (default) ---- */
:root {
  --bg:        #06070a;
  --bg-elev:   #0c0f16;
  --bg-elev-2: #11151f;
  --bg-card:   #0c0f16;

  --text:      #ffffff;
  --text-soft: #d1d4e3;
  --text-mute: #9ba9c4;
  --text-faint:#6c768c;

  --border:        rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.15);

  --accent:        #77216f;   /* brand purple */
  --accent-bright: #c24fb6;   /* lighter purple for links/icons on dark */
  --accent-soft:   rgba(194,79,182,0.14);
  --accent-grad:   linear-gradient(135deg, #8a2780 0%, #77216f 55%, #5c1a55 100%);
  --glow:          radial-gradient(60% 60% at 50% 0%, rgba(170,70,160,0.22) 0%, rgba(119,33,111,0.05) 45%, transparent 70%);

  --warm:      #ffcd7d;       /* secondary warm accent */

  --r-xs: 8px; --r-sm: 12px; --r: 16px; --r-lg: 22px; --r-xl: 30px; --r-pill: 999px;
  --shadow:    0 24px 60px -28px rgba(0,0,0,0.7);
  --shadow-sm: 0 10px 30px -18px rgba(0,0,0,0.6);

  --maxw: 1200px;
  --pad: clamp(1.25rem, 5vw, 4rem);
  --gap: clamp(1rem, 2.5vw, 1.5rem);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  color-scheme: dark;
}

/* ---- TOKENS: LIGHT ---- */
:root[data-theme="light"] {
  --bg:        #ffffff;
  --bg-elev:   #f6f7fb;
  --bg-elev-2: #eef1f7;
  --bg-card:   #ffffff;

  --text:      #0c0f16;
  --text-soft: #2f3950;
  --text-mute: #5b6678;
  --text-faint:#8a93a6;

  --border:        rgba(12,15,22,0.10);
  --border-strong: rgba(12,15,22,0.18);

  --accent:        #77216f;
  --accent-bright: #8e2a84;
  --accent-soft:   rgba(119,33,111,0.10);
  --accent-grad:   linear-gradient(135deg, #8a2780 0%, #77216f 60%, #611a5a 100%);
  --glow:          radial-gradient(60% 60% at 50% 0%, rgba(119,33,111,0.14) 0%, rgba(119,33,111,0.04) 45%, transparent 70%);

  --shadow:    0 24px 60px -30px rgba(30,20,50,0.22);
  --shadow-sm: 0 10px 30px -20px rgba(30,20,50,0.16);

  color-scheme: light;
}

/* Follow device setting when the user hasn't explicitly chosen (device-bound). */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) {
    --bg:#ffffff; --bg-elev:#f6f7fb; --bg-elev-2:#eef1f7; --bg-card:#ffffff;
    --text:#0c0f16; --text-soft:#2f3950; --text-mute:#5b6678; --text-faint:#8a93a6;
    --border:rgba(12,15,22,0.10); --border-strong:rgba(12,15,22,0.18);
    --accent-bright:#8e2a84; --accent-soft:rgba(119,33,111,0.10);
    --glow:radial-gradient(60% 60% at 50% 0%, rgba(119,33,111,0.14) 0%, rgba(119,33,111,0.04) 45%, transparent 70%);
    --shadow:0 24px 60px -30px rgba(30,20,50,0.22); --shadow-sm:0 10px 30px -20px rgba(30,20,50,0.16);
    color-scheme: light;
  }
}

/* ---- BASE ---- */
body {
  background: var(--bg);
  color: var(--text-soft);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}
::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent-bright); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3, h4 { color: var(--text); font-weight: 600; line-height: 1.1; letter-spacing: -0.02em; }
strong { color: var(--text); font-weight: 600; }

/* ---- LAYOUT ---- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: var(--pad); }
.section { padding-block: clamp(4.5rem, 11vh, 8rem); position: relative; }
.section--tight { padding-block: clamp(3rem, 7vh, 5rem); }
.skip-nav {
  position: absolute; left: 1rem; top: -120%; z-index: 200;
  background: var(--accent); color: #fff; padding: 0.7rem 1.1rem; border-radius: var(--r-xs);
  font-size: 0.8rem; transition: top 0.2s;
}
.skip-nav:focus { top: 1rem; }

/* ---- TYPOGRAPHY HELPERS ---- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent-bright);
}
.badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 0.85rem; border: 1px solid var(--border-strong); border-radius: var(--r-pill);
  background: var(--bg-elev); color: var(--text-mute);
  font-size: 0.74rem; font-weight: 500; letter-spacing: 0.02em;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-bright); box-shadow: 0 0 10px var(--accent-bright); }
.h-display { font-size: clamp(2.4rem, 6vw, 4.4rem); }
.h1 { font-size: clamp(2rem, 4.6vw, 3.4rem); }
.h2 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); }
.h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
.lead { font-size: clamp(1.02rem, 1.5vw, 1.18rem); color: var(--text-mute); line-height: 1.65; }
.muted { color: var(--text-mute); }
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.measure { max-width: 42ch; }
.measure-wide { max-width: 58ch; }
.section-head { max-width: 640px; margin-bottom: clamp(2.2rem, 5vw, 3.5rem); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head .h2 { margin: 0.9rem 0 0.6rem; }

.gradient-text {
  background: linear-gradient(120deg, var(--accent-bright), var(--warm));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.55rem;
  padding: 0.8rem 1.4rem; border-radius: var(--r-pill);
  font-size: 0.92rem; font-weight: 600; letter-spacing: -0.01em;
  border: 1px solid transparent; transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, box-shadow 0.25s;
  white-space: nowrap;
}
.btn svg { width: 1.05em; height: 1.05em; }
.btn-primary { background: var(--accent-grad); color: #fff; box-shadow: 0 10px 30px -12px rgba(119,33,111,0.7); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 38px -12px rgba(119,33,111,0.85); }
.btn-ghost { border-color: var(--border-strong); color: var(--text); background: var(--bg-elev); }
.btn-ghost:hover { border-color: var(--accent-bright); transform: translateY(-2px); }
.btn-lg { padding: 1rem 1.8rem; font-size: 1rem; }
.btn-block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.btn-row.center { justify-content: center; }
.link-arrow {
  display: inline-flex; align-items: center; gap: 0.4rem; color: var(--accent-bright);
  font-weight: 600; font-size: 0.92rem; transition: gap 0.25s var(--ease);
}
.link-arrow:hover { gap: 0.7rem; }

/* ---- NAV ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent; transition: border-color 0.3s, background 0.3s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 700; color: var(--text); letter-spacing: -0.02em; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  background: var(--accent-grad); color: #fff; display: grid; place-items: center;
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.02em; box-shadow: 0 6px 18px -8px rgba(119,33,111,0.8);
}
.nav-links { display: flex; align-items: center; gap: 0.35rem; }
.nav-links a {
  padding: 0.5rem 0.85rem; border-radius: var(--r-xs); font-size: 0.9rem; font-weight: 500;
  color: var(--text-mute); transition: color 0.2s, background 0.2s;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--bg-elev); }
.nav-actions { display: flex; align-items: center; gap: 0.5rem; }
.theme-toggle {
  width: 40px; height: 40px; border-radius: var(--r-pill); border: 1px solid var(--border);
  display: grid; place-items: center; color: var(--text-mute); transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
.burger { width: 42px; height: 42px; border-radius: var(--r-xs); display: none; place-items: center; border: 1px solid var(--border); }
.burger span { display:block; width:18px; height:2px; background: var(--text); border-radius:2px; transition: transform 0.3s var(--ease), opacity 0.2s; }
.burger span + span { margin-top: 4px; }
.burger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: 68px 0 0; z-index: 99; background: var(--bg);
  padding: 1.5rem var(--pad); display: flex; flex-direction: column; gap: 0.25rem;
  transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity 0.3s, transform 0.3s var(--ease);
}
.mobile-menu.open { opacity: 1; transform: none; pointer-events: auto; }
.mobile-menu a { padding: 0.9rem 0.5rem; font-size: 1.1rem; color: var(--text); border-bottom: 1px solid var(--border); }
.mobile-menu .btn { margin-top: 1.2rem; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .burger { display: grid; }
}

/* ---- HERO ---- */
.hero { position: relative; padding-block: clamp(4rem, 12vh, 8rem) clamp(3.5rem, 8vh, 6rem); text-align: center; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -10% 0 auto; height: 720px; pointer-events: none; z-index: 0;
  background: var(--glow);
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { margin: 1.3rem auto 1.1rem; max-width: 16ch; }
.hero .lead { max-width: 56ch; margin: 0 auto 2rem; }
.hero .btn-row { justify-content: center; }
.hero-note { margin-top: 1.4rem; font-size: 0.85rem; color: var(--text-faint); }

/* trust / sectors strip */
.trust { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 0.6rem 1.4rem; margin-top: 3rem; }
.trust span { color: var(--text-faint); font-size: 0.82rem; }
.trust .chip { padding: 0.45rem 0.9rem; border: 1px solid var(--border); border-radius: var(--r-pill); color: var(--text-mute); font-size: 0.82rem; }

/* ---- GRID + CARDS ---- */
.grid { display: grid; gap: var(--gap); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: clamp(1.4rem, 2.5vw, 2rem); transition: border-color 0.3s, transform 0.3s var(--ease), box-shadow 0.3s;
  height: 100%;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.card .h3 { margin-bottom: 0.5rem; }
.card p { color: var(--text-mute); font-size: 0.95rem; }
.icon-chip {
  width: 46px; height: 46px; border-radius: var(--r-sm); display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-bright); margin-bottom: 1.1rem;
}
.icon-chip svg { width: 22px; height: 22px; }
.card-tag { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); }

/* feature list inside cards */
.feature-list { margin-top: 1rem; display: flex; flex-direction: column; gap: 0.6rem; }
.feature-list li { display: flex; gap: 0.6rem; font-size: 0.92rem; color: var(--text-mute); }
.feature-list li::before {
  content: ""; flex: none; width: 18px; height: 18px; margin-top: 0.15rem; border-radius: 50%;
  background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23c24fb6' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center / 12px no-repeat;
}

/* ---- PILLARS (icon + stat) ---- */
.pillar { text-align: left; }
.pillar .num { font-size: 0.78rem; font-weight: 700; color: var(--accent-bright); letter-spacing: 0.1em; }

/* ---- STEPS ---- */
.steps { counter-reset: step; }
.step { position: relative; }
.step .step-no {
  width: 42px; height: 42px; border-radius: var(--r-pill); display: grid; place-items: center;
  border: 1px solid var(--border-strong); color: var(--accent-bright); font-weight: 700; margin-bottom: 1.1rem;
}

/* ---- SECTORS ---- */
.sectors { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.sectors li {
  padding: 0.6rem 1.1rem; border: 1px solid var(--border); border-radius: var(--r-pill);
  color: var(--text-soft); font-size: 0.92rem; background: var(--bg-elev);
}

/* ---- CASE STUDIES ---- */
.case { display: grid; grid-template-columns: 1fr; gap: 1.2rem; }
.case-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; }
.case-card-inner { padding: clamp(1.5rem, 3vw, 2.2rem); display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(1.5rem, 3vw, 3rem); align-items: center; }
.case-client { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 0.8rem; }
.case-client .h3 { margin: 0; }
.case-sector { font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-faint); }
.case-quote { color: var(--text-mute); font-size: 0.98rem; }
.metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.metric { border: 1px solid var(--border); border-radius: var(--r); padding: 1rem; background: var(--bg-elev); text-align: center; }
.metric .num { display: block; font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 700; color: var(--text); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.metric .num em { font-style: normal; background: linear-gradient(120deg, var(--accent-bright), var(--warm)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.metric .lbl { font-size: 0.74rem; color: var(--text-mute); margin-top: 0.35rem; display: block; line-height: 1.35; }
@media (max-width: 760px) { .case-card-inner { grid-template-columns: 1fr; } }

/* ---- PRICING ---- */
.price-toggle { display: inline-flex; align-items: center; gap: 0.6rem; margin: 0 auto 2.5rem; padding: 0.35rem; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--bg-elev); }
.price-toggle button { padding: 0.5rem 1.1rem; border-radius: var(--r-pill); font-size: 0.88rem; font-weight: 600; color: var(--text-mute); }
.price-toggle button.active { background: var(--accent-grad); color: #fff; }
.price-toggle .save { font-size: 0.72rem; color: var(--accent-bright); }
.price-card { display: flex; flex-direction: column; }
.price-card.featured { border-color: var(--accent-bright); box-shadow: 0 0 0 1px var(--accent-bright), var(--shadow-sm); position: relative; }
.price-card.featured::before {
  content: "Most popular"; position: absolute; top: -0.8rem; left: 50%; transform: translateX(-50%);
  background: var(--accent-grad); color: #fff; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 0.3rem 0.8rem; border-radius: var(--r-pill);
}
.price-name { font-size: 1.05rem; font-weight: 700; color: var(--text); }
.price-amount { font-size: clamp(2rem, 4vw, 2.6rem); font-weight: 700; color: var(--text); letter-spacing: -0.03em; margin: 0.6rem 0 0.2rem; }
.price-amount small { font-size: 0.85rem; font-weight: 500; color: var(--text-mute); }
.price-from { font-size: 0.78rem; color: var(--text-faint); }
.price-card .btn { margin: 1.4rem 0; }
.price-card .feature-list { margin-top: 0; }

/* ---- TESTIMONIALS ---- */
.quote-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg); padding: clamp(1.4rem, 2.5vw, 2rem); }
.quote-card p { color: var(--text-soft); font-size: 1.0rem; }
.quote-card .stars { color: var(--warm); letter-spacing: 0.15em; margin-bottom: 0.8rem; font-size: 0.9rem; }
.quote-who { margin-top: 1.2rem; font-size: 0.85rem; color: var(--text-mute); }
.quote-who strong { display: block; color: var(--text); }

/* ---- FAQ ---- */
.faq { max-width: 760px; margin-inline: auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem 0; text-align: left; font-size: 1.02rem; font-weight: 600; color: var(--text); }
.faq-q .chev { flex: none; transition: transform 0.3s var(--ease); color: var(--accent-bright); }
.faq-item.open .faq-q .chev { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s var(--ease); }
.faq-a p { padding-bottom: 1.25rem; color: var(--text-mute); font-size: 0.96rem; }

/* ---- CTA BAND ---- */
.cta-band { position: relative; overflow: hidden; border: 1px solid var(--border); border-radius: var(--r-xl); padding: clamp(2.5rem, 6vw, 4.5rem) var(--pad); text-align: center; background: var(--bg-elev); }
.cta-band::before { content: ""; position: absolute; inset: -50% 0 auto; height: 400px; background: var(--glow); pointer-events: none; }
.cta-band > * { position: relative; z-index: 1; }
.cta-band .h2 { margin-bottom: 0.8rem; }

/* ---- FOOTER ---- */
.footer { border-top: 1px solid var(--border); padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; margin-top: 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 2rem; }
.footer h4 { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); margin-bottom: 1rem; }
.footer ul li + li { margin-top: 0.6rem; }
.footer a { color: var(--text-mute); font-size: 0.92rem; transition: color 0.2s; }
.footer a:hover { color: var(--text); }
.footer-brand p { color: var(--text-mute); font-size: 0.92rem; max-width: 30ch; margin-top: 1rem; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }
.footer-bottom p { font-size: 0.82rem; color: var(--text-faint); }
.footer-social { display: flex; gap: 0.6rem; }
.footer-social a { width: 38px; height: 38px; border: 1px solid var(--border); border-radius: var(--r-pill); display: grid; place-items: center; }
.footer-social a:hover { border-color: var(--accent-bright); color: var(--text); }
.footer-social svg { width: 17px; height: 17px; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---- REVEAL ANIMATION ---- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }

/* ---- SPACING HELPERS ---- */
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; }
.stack > * + * { margin-top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}