/* ============================================================
   main.css — shared across all pages (home + case studies)
   ============================================================ */

/* ============ Fonts ============ */
/* Tik Tok Sans — variable font (opsz 12–36, wght 300–900) via Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=TikTok+Sans:opsz,wght@12..36,300..900&display=swap');

/* ============ Tokens ============ */
:root{
  color-scheme:light;
  --ink:#272727;
  --muted:#959595;
  --grey:#eeeeee;
  --blue:#304ffe;
  /* Surfaces & hairlines (themed — see dark overrides below) */
  --bg:#ffffff;
  --surface:#eeeeee;     /* buttons, chips, cards */
  --surface-2:#ffffff;   /* lightbox, inputs */
  --border:#eeeeee;      /* dividers, outlines */
  --nav-bg:rgba(255,255,255,.68);
  --media-bg:#f3f4f7;    /* image/video placeholder */
  --on-ink:#ffffff;      /* text on --ink (hover) */
  --pad:4rem;               /* side gutter — laptop base (1280–1899); overridden per breakpoint */
  --r-media:2rem;
  --r-btn:1.2rem;
  --nav-h:5rem;
  --ease:cubic-bezier(.22,.61,.36,1);

  /* ---- Typography scale — base = laptop (1280–1899px) ---- */
  --fs-h1:4rem;          /* 64 */
  --fs-h2:3rem;          /* 48 */
  --fs-h3:2.25rem;       /* 36 */
  --fs-h4:1.75rem;       /* 28 */
  --fs-h5:1.375rem;      /* 22 */
  --fs-h6:1.125rem;      /* 18 */
  --fs-lead:1.375rem;    /* 22 */
  --fs-body:1.25rem;     /* 20 */
  --fs-btn:1rem;         /* 16 */
  --fs-caption:.875rem;  /* 14 */
  --fs-overline:.75rem;  /* 12 */
  --fs-micro:.75rem;     /* 12 */

  --fw-regular:400;
  --fw-medium:500;
  --fw-semibold:600;

  --lh-h1:1.05;
  --lh-h2:1.1;
  --lh-h3:1.15;
  --lh-h4:1.2;
  --lh-h5:1.3;
  --lh-h6:1.35;
  --lh-lead:1.5;
  --lh-body:1.55;
  --lh-caption:1.45;

  --ls-h1:-0.02em;
  --ls-h2:-0.02em;
  --ls-h3:-0.015em;
  --ls-h4:-0.01em;
  --ls-overline:0.08em;
  --ls-num:-0.02em;

  /* ---- Spacing scale ---- */
  --space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;
  --space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;
  --space-16:4rem;--space-24:6rem;

  /* ---- Vertical rhythm ---- */
  --gap-block:6rem;      /* between major blocks; → 3.5rem on mobile */
  --gap-title:3rem;      /* section title → its content */
  --gap-heading:1.25rem; /* subheading → body text */
  --gap-para:1rem;       /* paragraph → paragraph */
  --gap-card:6rem;       /* rows of case cards */
}
/* Desktop — wide monitors ≥1900 */
@media(min-width:1900px){:root{
  --pad:12rem;
  --fs-h1:4.5rem;--fs-h2:3.5rem;--fs-h3:2.5rem;--fs-h4:2rem;--fs-h5:1.5rem;--fs-h6:1.25rem;
  --fs-lead:1.5rem;--fs-body:1.375rem;--fs-btn:1.125rem;--fs-caption:1rem;--fs-overline:.8125rem;--fs-micro:.8125rem;
}}
/* Tablet ≤1279 */
@media(max-width:1279px){:root{
  --pad:2rem;
  --fs-h1:3rem;--fs-h2:2.25rem;--fs-h3:1.75rem;--fs-h4:1.5rem;--fs-h5:1.25rem;--fs-h6:1.125rem;
  --fs-lead:1.25rem;--fs-body:1.125rem;
}}
/* Mobile ≤767 */
@media(max-width:767px){:root{
  --pad:1rem;
  --gap-block:3.5rem;
  --fs-h1:2.25rem;--fs-h2:1.75rem;--fs-h3:1.5rem;--fs-h4:1.25rem;--fs-h5:1.125rem;--fs-h6:1rem;
  --fs-lead:1.125rem;--fs-body:1rem;--fs-caption:.8125rem;
}}

/* ============ Dark theme ============ */
/* Same palette for auto (follows the OS) and for the manual toggle.
   [data-theme="light"] opts out of the OS-dark auto path. */
@media(prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --ink:#e9eaec;
    --muted:#8b8f98;
    --bg:#111318;
    --surface:#20222b;
    --surface-2:#1b1d24;
    --border:rgba(255,255,255,.12);
    --nav-bg:rgba(17,19,24,.72);
    --media-bg:#1b1d24;
    --on-ink:#111318;
  }
}
[data-theme="dark"]{
  color-scheme:dark;
  --ink:#e9eaec;
  --muted:#8b8f98;
  --bg:#111318;
  --surface:#20222b;
  --surface-2:#1b1d24;
  --border:rgba(255,255,255,.12);
  --nav-bg:rgba(17,19,24,.72);
  --media-bg:#1b1d24;
  --on-ink:#111318;
}

/* ============ Base ============ */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-h)}
body{
  font-family:'TikTok Sans',-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
  color:var(--ink);background:var(--bg);
  font-size:var(--fs-body);font-weight:var(--fw-regular);line-height:var(--lh-body);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}

h1,.h1{font-size:var(--fs-h1);font-weight:var(--fw-semibold);line-height:var(--lh-h1);letter-spacing:var(--ls-h1)}
h2,.h2{font-size:var(--fs-h2);font-weight:var(--fw-semibold);line-height:var(--lh-h2);letter-spacing:var(--ls-h2)}
h3,.h3{font-size:var(--fs-h3);font-weight:var(--fw-medium);line-height:var(--lh-h3);letter-spacing:var(--ls-h3)}
h4,.h4{font-size:var(--fs-h4);font-weight:var(--fw-medium);line-height:var(--lh-h4);letter-spacing:var(--ls-h4)}
h5,.h5{font-size:var(--fs-h5);font-weight:var(--fw-medium);line-height:var(--lh-h5)}
h6,.h6{font-size:var(--fs-h6);font-weight:var(--fw-medium);line-height:var(--lh-h6)}

/* Text roles */
.lead{font-size:var(--fs-lead);font-weight:var(--fw-regular);line-height:var(--lh-lead)}
.caption{font-size:var(--fs-caption);line-height:var(--lh-caption)}
.overline{font-size:var(--fs-overline);font-weight:var(--fw-semibold);line-height:1.3;letter-spacing:var(--ls-overline);text-transform:uppercase}
.micro{font-size:var(--fs-micro);line-height:1.4}

.wrap{padding:3.5rem var(--pad) 1rem}

/* ============ Reveal-on-scroll ============ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--surface);color:var(--ink);
  font:inherit;font-size:var(--fs-btn);font-weight:var(--fw-medium);line-height:1.5;
  padding:.8rem 1.2rem;height:3.25rem;border:none;border-radius:var(--r-btn);cursor:pointer;
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.btn:hover,.btn:focus-visible{background:var(--ink);color:var(--on-ink);transform:translateY(-2px)}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover,.btn-blue:focus-visible{background:var(--ink);color:#fff}
/* Theme toggle — icon-only button injected into the nav by main.js */
.theme-toggle{width:3.25rem;padding:.8rem}
.theme-toggle svg{width:1.2rem;height:1.2rem;display:block}
@media(max-width:767px){.theme-toggle{width:3rem}}

/* ============ Header (sticky, blurred) ============ */
.site-nav{
  position:sticky;top:0;z-index:50;
  background:var(--nav-bg);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  box-shadow:0 34px 60px -30px rgba(39,39,39,0);
  transition:box-shadow .3s var(--ease);
  animation:navIn .6s var(--ease) both;
}
.site-nav.scrolled{box-shadow:0 34px 60px -30px rgba(39,39,39,.32)}
@keyframes navIn{from{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:none}}
.nav-inner{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 2rem;align-items:center;
  padding:1rem var(--pad);
}
.logo{font-size:1.25rem;font-weight:var(--fw-medium)}
.nav-links{display:flex;justify-content:space-between;align-items:center;gap:4px 1rem;flex-wrap:wrap}
.nav-links-group{display:flex;gap:4px;align-items:center;flex-wrap:wrap}

/* Mobile header cluster (shown < 768px) */
.nav-mobile{display:none;width:100%;align-items:center;justify-content:space-between;gap:8px}
.nav-mobile-right{display:flex;gap:4px}

/* Tablet & down: compact mobile header/footer button sets */
@media(max-width:1279px){
  .nav-inner{display:flex}
  .logo,.nav-links{display:none}
  .nav-mobile{display:flex}
  .contacts .links .btn{display:none}
  .contacts{display:flex;flex-wrap:nowrap;align-items:center;justify-content:space-between}
  .contacts p{margin:0}
  .contacts .links{flex-wrap:nowrap;flex:0 0 auto}
}
/* Phone only: shorter buttons */
@media(max-width:767px){
  .btn,.totop{height:3rem}
}

/* ============ Dividers ============ */
.divider{height:1px;border:none;background:var(--border);margin:var(--gap-block) 0}
/* pre-footer divider sits 1rem above the buttons — mirrors the header's 1rem */
.divider#contacts{margin-bottom:var(--space-4)}

/* ============ Contacts / footer ============ */
/* Mirrors the header: 2-col grid, copyright left, links in the right column */
.contacts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 2rem;align-items:center}
.contacts .links{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
/* Push the action dock (back-to-top + chat) to the far right, like the header's CV */
.contacts .links .dock{margin-left:auto}

/* ============ Back-to-top & floating actions ============ */
.totop{
  display:inline-flex;align-items:center;justify-content:center;
  height:3.25rem;padding:.8rem 1.15rem;
  font-size:var(--fs-btn);line-height:1.5;border-radius:var(--r-btn);
  background:var(--surface);color:var(--ink);
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.totop:hover,.totop:focus-visible{background:var(--ink);color:var(--on-ink);transform:translateY(-2px)}
.totop svg{height:1.05em;width:auto;display:block}
/* ============ Action dock (back-to-top + chat) ============ */
/* One container: sits in the footer, and floats (fixed) while the footer is off-screen */
.dock{display:flex;align-items:center}
.dock .dock-top{margin-right:4px}
.dock.floating{position:fixed;right:var(--pad);bottom:1rem;z-index:40}
.dock.floating .totop{box-shadow:0 14px 34px -14px rgba(39,39,39,.45)}
.fab-chat{
  background:var(--blue);color:#fff;border:none;cursor:pointer;
  transition:opacity .3s var(--ease),background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.fab-chat:hover,.fab-chat:focus-visible{background:var(--ink);color:#fff;transform:translateY(-2px)}
/* While floating near the top, collapse the back-to-top away — leaving just chat */
.dock-top{
  transition:opacity .3s var(--ease),transform .3s var(--ease),width .3s var(--ease),padding .3s var(--ease),margin .3s var(--ease);
}
.dock-top.is-collapsed{
  opacity:0;pointer-events:none;transform:translateX(14px) scale(.85);
  width:0;min-width:0;padding-left:0;padding-right:0;margin:0;overflow:hidden;
}

/* ============ Feedback lightbox ============ */
.lb-scrim{
  position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px;
  background:rgba(39,39,39,.42);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  opacity:0;visibility:hidden;transition:opacity .3s var(--ease),visibility .3s var(--ease);
}
.lb-scrim.open{opacity:1;visibility:visible}
.lb{
  background:var(--surface-2);border-radius:var(--r-media);width:100%;max-width:460px;padding:2.5rem;position:relative;
  max-height:calc(100vh - 48px);overflow-y:auto;
  transform:translateY(14px) scale(.98);transition:transform .35s var(--ease);
}
.lb-scrim.open .lb{transform:none}
.lb-close{
  position:absolute;top:1rem;right:1rem;width:2.4rem;height:2.4rem;border:none;border-radius:50%;cursor:pointer;
  background:var(--surface);color:var(--ink);font-size:1.05rem;display:flex;align-items:center;justify-content:center;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.lb-close:hover{background:var(--ink);color:var(--on-ink);transform:rotate(90deg)}
.lb h2{margin-bottom:.4rem}
.lb-sub{color:var(--muted);font-size:var(--fs-btn);margin-bottom:1.5rem}
.lb-field{margin-bottom:1rem}
.lb-field label{display:block;font-size:var(--fs-caption);font-weight:var(--fw-medium);margin-bottom:.4rem}
.lb-field input,.lb-field textarea{
  width:100%;font:inherit;font-size:var(--fs-btn);color:var(--ink);background:var(--surface-2);
  border:1px solid var(--border);border-radius:.9rem;padding:.7rem .9rem;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.lb-field textarea{resize:vertical;min-height:6rem}
.lb-field input:focus,.lb-field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(48,79,254,.14)}
.lb-submit{width:100%;margin-top:.4rem}
.lb-legal{font-size:var(--fs-micro);color:var(--muted);text-align:center;margin-top:.9rem}
.lb-success{text-align:center;padding:1rem 0}
.lb-check{width:3.4rem;height:3.4rem;border-radius:50%;background:rgba(48,79,254,.1);color:var(--blue);
  display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;font-size:1.6rem}

/* ============ Accessibility & print ============ */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .site-nav{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
}
@media print{
  .site-nav,.totop,.dock,.lb-scrim{display:none}
  .reveal{opacity:1;transform:none}
  .divider{margin:2rem 0}
}