/* ==========================================================
   Web de matemàtiques — estils
   ========================================================== */

:root {
  --navy: #1b2748;
  --navy-2: #24375f;
  --accent: #ff7a50;
  --accent-2: #2bb3a3;
  --yellow: #ffc94d;

  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #eef1f8;
  --text: #1b2340;
  --muted: #5d6685;
  --border: #e1e5f0;
  --shadow: 0 10px 30px -12px rgba(27, 39, 72, 0.22);

  --radius: 18px;
  --max: 1160px;
  --header-h: 68px;
}

:root[data-theme="dark"] {
  --bg: #0f1526;
  --surface: #172036;
  --surface-2: #1e2943;
  --text: #e8ecf7;
  --muted: #a1abc8;
  --border: #2a3654;
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1526;
    --surface: #172036;
    --surface-2: #1e2943;
    --text: #e8ecf7;
    --muted: #a1abc8;
    --border: #2a3654;
    --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.6);
  }
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Outfit", "Inter", system-ui, sans-serif;
  line-height: 1.2;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}

a { color: inherit; }
img { max-width: 100%; display: block; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -999px; top: 8px; z-index: 100;
  background: var(--accent); color: #fff; padding: 8px 14px; border-radius: 8px;
}
.skip-link:focus { left: 8px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

/* ---------- Capçalera ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  height: 100%; display: flex; align-items: center; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: "Outfit", sans-serif; font-weight: 700; font-size: 1.15rem;
  text-decoration: none; margin-right: auto; white-space: nowrap; min-width: 0;
}
.brand-logo { flex: none; }
.brand-text { overflow: hidden; text-overflow: ellipsis; }
.brand-logo {
  width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--yellow));
  color: #fff; font-family: Georgia, serif; font-style: italic; font-size: 1.25rem;
}

.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; }
.main-nav a {
  display: block; padding: 8px 14px; border-radius: 999px;
  text-decoration: none; font-weight: 500; color: var(--muted);
  transition: background .2s, color .2s;
}
.main-nav a:hover { color: var(--text); background: var(--surface-2); }
.main-nav a[aria-current="page"] { color: #fff; background: var(--navy); }
:root[data-theme="dark"] .main-nav a[aria-current="page"] { background: var(--accent); }

.header-tools { display: flex; align-items: center; gap: 8px; }

.lang-switch {
  display: flex; background: var(--surface-2); border-radius: 999px; padding: 3px;
}
.lang-switch button {
  border: 0; background: transparent; color: var(--muted);
  font: 600 .8rem "Inter", sans-serif; padding: 6px 10px; border-radius: 999px; cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 4px rgba(0,0,0,.12); }

.icon-btn {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  display: grid; place-items: center;
}
.icon-btn svg { width: 20px; height: 20px; }
.menu-toggle { display: none; }

/* ---------- Banner ---------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: #1b2748 url("../img/banner.svg") center / cover no-repeat;
  padding: clamp(70px, 12vw, 140px) 0 clamp(80px, 12vw, 150px);
}
.hero::after {
  content: ""; position: absolute; inset: auto 0 -1px 0; height: 60px;
  background: var(--bg);
  clip-path: ellipse(75% 100% at 50% 100%);
}
.hero .container { position: relative; z-index: 1; text-align: center; }
.hero-kicker {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2);
  font-size: .85rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 4.6rem); font-weight: 800; margin: 18px 0 12px;
}
.hero h1.logo-title span, .brand-text b { color: var(--accent); }
.brand-text b { font-weight: 700; }
.hero p { font-size: clamp(1.05rem, 2.2vw, 1.3rem); opacity: .88; max-width: 640px; margin: 0 auto 30px; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 999px; border: 0;
  font: 600 1rem "Inter", sans-serif; text-decoration: none; cursor: pointer;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 20px -8px var(--accent); }
.btn-ghost { background: rgba(255,255,255,.12); color: #fff; border: 1px solid rgba(255,255,255,.35); }

/* ---------- Seccions ---------- */
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.section-title p { color: var(--muted); margin: 0 auto; max-width: 560px; }
.eyebrow {
  display: inline-block; color: var(--accent); font-weight: 700;
  font-size: .85rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 8px;
}

/* ---------- Sobre mi ---------- */
.about {
  display: grid; grid-template-columns: 340px 1fr; gap: clamp(32px, 6vw, 72px); align-items: center;
}
.about-section {
  background:
    radial-gradient(circle at 85% 10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 45%),
    var(--surface-2);
  border-top: 1px solid var(--border);
}
.about-photo { position: relative; max-width: 340px; width: 100%; margin: 0 auto; }
.about-photo::before {
  content: ""; position: absolute; inset: 22px -18px -18px 22px; border-radius: 28px;
  background: linear-gradient(135deg, var(--accent), var(--yellow));
  transform: rotate(3deg);
}
.about-photo img {
  position: relative; z-index: 1; width: 100%; height: auto; aspect-ratio: 743 / 900; object-fit: cover;
  border-radius: 24px; border: 6px solid var(--surface); box-shadow: var(--shadow);
}

.about-text h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
.about-text .lead { font-size: 1.2rem; color: var(--muted); }
.about-text .lead strong { color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; padding: 0; list-style: none; }
.chip {
  padding: 6px 14px; border-radius: 999px; background: var(--surface);
  border: 1px solid var(--border); font-size: .9rem; font-weight: 500;
}

/* ---------- Targetes de nivell ---------- */
.levels { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.level-card {
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 10px;
  padding: 30px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  text-decoration: none; box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
}
.level-card:hover { transform: translateY(-4px); box-shadow: 0 18px 40px -14px rgba(27,39,72,.35); }
.level-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 6px; background: var(--c, var(--accent));
}
.level-card .symbol {
  position: absolute; right: 18px; top: 4px; font-family: Georgia, serif; font-style: italic;
  font-size: 5.5rem; opacity: .08; pointer-events: none;
}
.level-card .tag {
  align-self: flex-start; font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--c); background: color-mix(in srgb, var(--c) 14%, transparent);
  padding: 4px 10px; border-radius: 999px;
}
.level-card h3 { font-size: 1.6rem; margin: 4px 0 0; }
.level-card p { color: var(--muted); margin: 0; }
.level-card .go { margin-top: auto; padding-top: 12px; font-weight: 600; color: var(--c); }

/* ---------- Tipus de materials ---------- */
.types { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; }
.type {
  padding: 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border);
}
.type .ico {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 12px;
  background: color-mix(in srgb, var(--c) 15%, transparent); color: var(--c);
}
.type .ico svg { width: 24px; height: 24px; }
.type h3 { font-size: 1.15rem; margin-bottom: 4px; }
.type p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ---------- Pàgina de nivell ---------- */
.page-hero {
  color: #fff; background: #1b2748 url("../img/banner.svg") center / cover no-repeat;
  padding: 56px 0 64px; position: relative;
}
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 8px 0 6px; }
.page-hero p { opacity: .85; margin: 0; max-width: 640px; }
.breadcrumb { font-size: .9rem; opacity: .8; }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.toolbar {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center;
  margin: -28px 0 32px; position: relative; z-index: 2;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
  padding: 14px; border-radius: var(--radius);
}
.search {
  flex: 1 1 240px; display: flex; align-items: center; gap: 8px;
  background: var(--surface-2); border-radius: 12px; padding: 0 12px;
}
.search svg { width: 18px; height: 18px; color: var(--muted); flex: none; }
.search input {
  width: 100%; border: 0; background: transparent; color: var(--text);
  font: 1rem "Inter", sans-serif; padding: 11px 0; outline: none;
}
.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.filter {
  border: 1px solid var(--border); background: var(--surface); color: var(--muted);
  padding: 8px 14px; border-radius: 999px; font: 600 .88rem "Inter", sans-serif; cursor: pointer;
}
.filter[aria-pressed="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
:root[data-theme="dark"] .filter[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); }

.unit {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 16px; overflow: hidden;
}
.unit summary {
  list-style: none; cursor: pointer; padding: 20px 22px;
  display: flex; align-items: center; gap: 14px;
}
.unit summary::-webkit-details-marker { display: none; }
.unit .num {
  flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  font-weight: 800; font-family: "Outfit", sans-serif; color: #fff; background: var(--c, var(--accent));
}
.unit .u-title { font-family: "Outfit", sans-serif; font-weight: 600; font-size: 1.15rem; }
.unit .count { margin-left: auto; color: var(--muted); font-size: .88rem; white-space: nowrap; }
.unit .chev { width: 20px; height: 20px; color: var(--muted); transition: transform .2s; flex: none; }
.unit[open] .chev { transform: rotate(180deg); }
.unit ul { list-style: none; margin: 0; padding: 0 14px 14px; display: grid; gap: 8px; }

.item {
  display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: 12px;
  background: var(--surface-2); text-decoration: none; transition: background .2s, transform .15s;
}
a.item:hover { transform: translateX(3px); background: color-mix(in srgb, var(--c) 12%, var(--surface-2)); }
.item .ico {
  flex: none; width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  color: #fff; background: var(--c);
}
.item .ico svg { width: 20px; height: 20px; }
.item .meta { min-width: 0; }
.item .t { font-weight: 600; display: block; }
.item .d { color: var(--muted); font-size: .88rem; display: block; }
.item .kind {
  margin-left: auto; font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: var(--c); white-space: nowrap;
}
.item.soon { opacity: .6; }
.has-dl { display: flex; gap: 8px; }
.has-dl .item { flex: 1; min-width: 0; }
.dl {
  flex: none; width: 52px; border-radius: 12px; display: grid; place-items: center;
  background: var(--surface-2); color: var(--c); transition: background .2s;
}
.dl:hover { background: color-mix(in srgb, var(--c) 12%, var(--surface-2)); }
.dl svg { width: 22px; height: 22px; }

.empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* ---------- Modal de vídeo ---------- */
.modal {
  border: 0; padding: 0; background: transparent; width: min(960px, 94vw); max-width: none;
}
.modal::backdrop { background: rgba(10, 14, 28, .8); }
.modal .frame { position: relative; aspect-ratio: 16 / 9; background: #000; border-radius: 14px; overflow: hidden; }
.modal iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.modal .close {
  position: absolute; top: -48px; right: 0; background: #fff; color: #000; border: 0;
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer; font-size: 1.4rem;
}

/* ---------- Peu ---------- */
.site-footer {
  border-top: 1px solid var(--border); padding: 32px 0; color: var(--muted); font-size: .92rem;
}
.site-footer .container { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--text); }

/* ---------- Animació d'entrada ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}


/* ---------- Etiqueta "Nou" ---------- */
.badge-new {
  display: inline-block; vertical-align: middle;
  font: 700 .7rem "Inter", sans-serif; letter-spacing: .05em; text-transform: uppercase;
  color: #fff; background: linear-gradient(135deg, var(--accent), #ff5a7a);
  padding: 3px 8px; border-radius: 999px; margin-left: 4px;
  box-shadow: 0 4px 10px -4px var(--accent);
  animation: pop 2.4s ease-in-out infinite;
}
@keyframes pop { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.08); } }
.level-card .tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.unit summary .badge-new { margin-left: 0; }

/* ---------- Contacte ---------- */
.contact-buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.social-btn {
  width: 46px; height: 46px; border-radius: 14px; display: inline-grid; place-items: center;
  background: var(--surface); color: var(--text); border: 1px solid var(--border);
  transition: transform .15s, background .2s, color .2s, border-color .2s;
}
.social-btn svg { width: 20px; height: 20px; }
.social-btn:hover { transform: translateY(-2px); background: var(--accent); border-color: var(--accent); color: #fff; }
.social-btn.small { width: 36px; height: 36px; border-radius: 10px; }
.social-btn.small svg { width: 16px; height: 16px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.footer-links > a:last-child { margin-left: 8px; }

.mail-wrap { position: relative; display: inline-flex; }
button.social-btn { cursor: pointer; font: inherit; padding: 0; }
.mail-menu {
  position: absolute; left: 50%; top: calc(100% + 10px); transform: translateX(-50%); z-index: 40;
  min-width: 230px; padding: 6px; border-radius: 14px;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
  display: none; text-align: left;
}
.mail-menu.up { top: auto; bottom: calc(100% + 10px); }
.mail-wrap.open .mail-menu { display: grid; }
.mail-menu a, .mail-menu button {
  display: block; width: 100%; text-align: left; border: 0; background: transparent; color: var(--text);
  font: 500 .92rem "Inter", sans-serif; padding: 10px 12px; border-radius: 10px; text-decoration: none; cursor: pointer;
}
.mail-menu a:hover, .mail-menu button:hover { background: var(--surface-2); }

/* ---------- Repte i curiositat ---------- */
.challenge-section { padding-top: 0; }
.challenge-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 24px; align-items: start; }
.challenge, .curiosity {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.challenge.big { border-top: 6px solid var(--accent); }
.ch-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 10px; }
.challenge .tag, .tag-plain {
  font-size: .75rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent);
  padding: 4px 10px; border-radius: 999px;
}
.ch-date { color: var(--muted); font-size: .88rem; }
.challenge h3 { font-size: 1.4rem; }
.ch-statement { font-size: 1.12rem; }
.solution { margin-top: 14px; }
.solution summary {
  list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; color: #fff; background: var(--navy); padding: 10px 18px; border-radius: 999px;
}
:root[data-theme="dark"] .solution summary { background: var(--accent); }
.solution summary::-webkit-details-marker { display: none; }
.solution .hide, .solution[open] .show { display: none; }
.solution[open] .hide { display: inline; }
.solution p {
  margin: 14px 0 0; padding: 16px 18px; border-radius: 12px;
  background: color-mix(in srgb, var(--accent-2) 12%, var(--surface-2));
  border-left: 4px solid var(--accent-2);
}
.curiosity { position: relative; background: linear-gradient(160deg, color-mix(in srgb, var(--yellow) 18%, var(--surface)), var(--surface)); }
.cu-ico { font-size: 2rem; display: block; margin-bottom: 6px; }
.curiosity h3 { font-size: 1.2rem; }
.curiosity p { margin: 0; color: var(--muted); }
.more-link { display: inline-block; margin-top: 12px; font-weight: 600; color: var(--accent); text-decoration: none; }
.more-link:hover { text-decoration: underline; }
.narrow { max-width: 820px; margin: 0 auto; }
.stack { display: grid; gap: 18px; }
.curiosities { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.katex { font-size: 1.08em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

/* ---------- Racó PAU ---------- */
.pau-cta {
  display: block; margin: 0 0 20px; padding: 16px 20px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--navy), var(--navy-2)); color: #fff;
  font-weight: 600; text-decoration: none; box-shadow: var(--shadow);
  transition: transform .15s;
}
.pau-cta:hover { transform: translateY(-2px); }
.countdown-card {
  margin-top: -28px; position: relative; z-index: 2; text-align: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 28px 20px;
}
.countdown-card h2 { font-size: 1.3rem; color: var(--muted); font-weight: 600; }
.countdown { display: flex; justify-content: center; gap: clamp(10px, 3vw, 24px); margin: 10px 0; }
.cd-box {
  min-width: clamp(84px, 20vw, 130px); padding: 14px 10px; border-radius: 16px;
  background: linear-gradient(160deg, var(--navy-2), var(--navy)); color: #fff;
  display: flex; flex-direction: column; align-items: center;
}
.cd-n { font: 800 clamp(2rem, 7vw, 3.4rem)/1 "Outfit", sans-serif; color: var(--yellow); }
.cd-l { font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; opacity: .85; margin-top: 6px; }
.cd-date { color: var(--muted); margin: 8px 0 0; font-size: .95rem; }
.cd-date::first-letter { text-transform: uppercase; }
.cd-done { font-size: 1.4rem; font-weight: 700; }
.years { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; }
.year-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px;
}
.year-card h3 { font-size: 1.6rem; color: var(--accent-2); }
.conv { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 0; border-top: 1px solid var(--border); }
.conv-name { font-weight: 600; }
.conv-links { display: flex; gap: 6px; }
.pill {
  display: inline-flex; align-items: center; gap: 5px; padding: 6px 12px; border-radius: 999px;
  font-size: .85rem; font-weight: 600; text-decoration: none;
  background: var(--accent-2); color: #fff;
}
.pill svg { width: 15px; height: 15px; }
.pill.soon { background: var(--surface-2); color: var(--muted); }
.tips { max-width: 760px; margin: 0 auto; padding: 0; list-style: none; counter-reset: tip; display: grid; gap: 12px; }
.tips li {
  counter-increment: tip; position: relative; padding: 16px 18px 16px 64px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
}
.tips li::before {
  content: counter(tip); position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font: 800 1rem "Outfit", sans-serif;
}

@media (max-width: 900px) {
  .challenge-grid { grid-template-columns: 1fr; }
}

/* ---------- Capçalera en ordinador: logo a l'esquerra, menú centrat, idioma/tema a la dreta ---------- */
@media (min-width: 1101px) {
  .container { max-width: 80vw; }
  .site-header .container {
    max-width: none; padding: 0 28px;
    display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px;
  }
  .brand { justify-self: start; margin-right: 0; }
  .main-nav { justify-self: center; }
  .header-tools { justify-self: end; }
}

/* ---------- Responsiu ---------- */
@media (max-width: 1100px) {
  .menu-toggle { display: grid; }
  .main-nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: var(--surface); border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
    padding: 12px 20px 20px;
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: .2s;
  }
  .main-nav.open { transform: none; opacity: 1; visibility: visible; }
  .main-nav ul { flex-direction: column; }
  .main-nav a { padding: 12px 16px; border-radius: 12px; }
  .main-nav { order: 3; }
}

@media (max-width: 900px) {
  .about { grid-template-columns: 1fr; text-align: center; }
  .about-photo { max-width: 280px; }
  .chips, .contact-buttons { justify-content: center; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }
  .site-header .container { gap: 10px; }
  .header-tools { gap: 6px; flex: none; }
  .brand { font-size: 1.02rem; }
  .lang-switch button { padding: 6px 7px; font-size: .75rem; }
  .icon-btn { width: 36px; height: 36px; border-radius: 10px; }
  .item .kind { display: none; }
  .unit summary { padding: 16px; }
  .unit .count { display: none; }
  .toolbar { margin-top: -24px; }
}