/* ================================================================
   RadioRescate · K4DDI — style.css
   Mobile-first · Dark (default) + Light · Alto contraste
   ================================================================ */

/* -------- Variables de tema -------- */
:root {
  --font: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;

  /* Base tipográfica grande — comunidad mayor de edad */
  --fs-base: 18px;
  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1160px;
  --header-h: 66px;
  --transition: .25s ease;
}

/* --- Modo oscuro (default) --- */
[data-theme="dark"] {
  --bg: #0d1117;
  --bg-alt: #131a23;
  --surface: #1a222d;
  --surface-2: #212b38;
  --border: #2c3742;
  --text: #eef3f8;
  --text-dim: #b6c2cf;
  --accent: #00d4aa;
  --accent-2: #0ea5e9;
  --accent-contrast: #06231d;
  --shadow: 0 8px 26px rgba(0,0,0,.45);
}

/* --- Modo claro --- */
[data-theme="light"] {
  --bg: #f4f7fb;
  --bg-alt: #e9eef5;
  --surface: #ffffff;
  --surface-2: #f0f4f9;
  --border: #cdd7e2;
  --text: #10161d;
  --text-dim: #435162;
  --accent: #008a70;
  --accent-2: #0a6fa8;
  --accent-contrast: #ffffff;
  --shadow: 0 8px 22px rgba(20,40,70,.12);
}

/* -------- Reset -------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 10px); }

body {
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.65;
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* -------- Layout helpers -------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 720px; }

.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }

h1, h2, h3 { line-height: 1.2; font-weight: 800; }
h2 { font-size: clamp(26px, 4vw, 34px); margin-bottom: 8px; }
h3 { font-size: clamp(20px, 2.5vw, 24px); font-weight: 700; }

.section-lead {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 32px;
  max-width: 65ch;
}

/* -------- Header -------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; height: 100%;
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
}

.brand { display: flex; align-items: center; gap: 9px; color: var(--text); font-weight: 800; flex-shrink: 0; }
.brand:hover { text-decoration: none; }
.brand-logo { font-size: 1.5rem; }
.brand-text { font-size: 1.2rem; display: flex; align-items: baseline; gap: 7px; }
.brand-call {
  font-size: .72rem; font-weight: 700; letter-spacing: .5px;
  color: var(--accent-contrast); background: var(--accent);
  padding: 2px 7px; border-radius: 6px;
}

.main-nav { display: none; margin-left: auto; gap: 4px; }
.main-nav a {
  color: var(--text-dim); font-weight: 600; font-size: .98rem;
  padding: 8px 12px; border-radius: 8px;
  white-space: nowrap;
}
.main-nav a:hover { color: var(--text); background: var(--surface); text-decoration: none; }

.header-tools { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.main-nav + .header-tools { margin-left: 12px; }

.utc-clock {
  font-variant-numeric: tabular-nums; font-weight: 600;
  font-size: .85rem; color: var(--accent);
  background: var(--surface); border: 1px solid var(--border);
  padding: 6px 9px; border-radius: 8px; white-space: nowrap;
  display: none;
}

.tool-btn {
  font-family: inherit; font-size: 1rem; font-weight: 700;
  min-width: 42px; height: 42px; padding: 0 10px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  cursor: pointer; transition: var(--transition);
}
.tool-btn:hover { border-color: var(--accent); color: var(--accent); }
#lang-toggle { font-size: .9rem; letter-spacing: .5px; min-width: 90px; text-align: center; }

/* -------- Mobile nav drawer -------- */
.nav-burger { display: inline-flex; }
.main-nav.open {
  display: flex; flex-direction: column; gap: 4px;
  position: fixed; top: var(--header-h); left: 0; right: 0;
  background: var(--bg); border-bottom: 1px solid var(--border);
  padding: 14px 20px; box-shadow: var(--shadow);
}
.main-nav.open a { font-size: 1.1rem; padding: 12px; }

/* -------- Hero -------- */
.hero {
  padding: calc(var(--header-h) + 70px) 20px 80px;
  text-align: center;
  background:
    radial-gradient(1100px 460px at 50% -8%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 70%),
    radial-gradient(760px 320px at 82% 12%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 70%);
}
.hero-inner { max-width: 860px; margin: 0 auto; }
.hero h1 {
  font-size: clamp(38px, 8vw, 68px); font-weight: 800; letter-spacing: -1px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-sub { font-size: clamp(1.05rem, 2.4vw, 1.35rem); color: var(--text-dim); margin: 18px auto 34px; max-width: 60ch; }
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }

/* -------- Botones -------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-weight: 700; font-size: 1rem;
  padding: 13px 22px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer; transition: var(--transition);
}
.btn:hover { transform: translateY(-2px); text-decoration: none; box-shadow: var(--shadow); }
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast); border-color: transparent;
  font-size: 1.1rem; padding: 15px 26px;
}
[data-theme="light"] .btn-primary { color: #fff; }
.btn-sm { padding: 8px 16px; font-size: .92rem; }
.btn-block { width: 100%; }

/* -------- Cards -------- */
.card-grid {
  display: grid; gap: 20px;
  grid-template-columns: 1fr;
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
  display: flex; flex-direction: column; gap: 8px;
  transition: var(--transition);
}
.card-link:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow); text-decoration: none; }
.card .card-icon { font-size: 2.2rem; min-height: 52px; display: flex; align-items: center; }
.kiwi-icon { width: 40px; height: 52px; object-fit: contain; }
.btn-ico { height: 1.4em; width: auto; display: inline-block; vertical-align: middle; }
.card h3 { color: var(--text); }
.card p { color: var(--text-dim); font-size: .98rem; flex-grow: 1; }
.card-cta { color: var(--accent); font-weight: 700; margin-top: 6px; }
.link-list { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
.link-list a { font-weight: 600; word-break: break-word; }

/* -------- Ham table -------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.ham-table { width: 100%; border-collapse: collapse; min-width: 520px; }
.ham-table th, .ham-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.ham-table thead th { background: var(--surface-2); font-size: .82rem; text-transform: uppercase; letter-spacing: .6px; color: var(--text-dim); }
.ham-table tbody tr:last-child td { border-bottom: none; }
.ham-table tbody tr:hover { background: var(--surface-2); }
.ham-table .freq { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--accent); white-space: nowrap; }
.ham-table .flag { font-size: 1.3rem; margin-right: 4px; }

/* -------- Propagación (layout vertical) -------- */
.prop-block { margin: 0 auto 34px; }
.prop-block:last-child { margin-bottom: 0; }
.prop-title { font-size: clamp(20px, 2.5vw, 24px); font-weight: 700; margin-bottom: 16px; text-align: center; }

/* Widget solar HAMQSL: centrado, ancho máximo, responsivo */
.solar-link { display: block; text-align: center; }
.solar-img { display: block; margin: 0 auto; max-width: 100%; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--border); }

/* Descripción del radar DXLook */
.dxlook-desc { margin: 0 auto 20px; max-width: 900px; }
.dxlook-desc p { color: var(--text-dim); margin-bottom: 14px; }
.dxlook-desc strong { color: var(--text); }
.dxlook-bullets { list-style: none; display: grid; gap: 10px; }
.dxlook-bullets li {
  position: relative; padding-left: 26px; color: var(--text-dim);
}
.dxlook-bullets li::before {
  content: "📡"; position: absolute; left: 0; top: 0;
}
.dxlook-bullets strong { color: var(--accent); }

/* iframe DXLook: 100% ancho, 500px alto, centrado, sin borde */
.dxlook-iframe { display: block; width: 100%; height: 500px; border: none; margin: 0 auto; border-radius: var(--radius-sm); background: #000; }

.iframe-wrap { position: relative; width: 100%; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border); background: #000; }
.iframe-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.iframe-video { padding-top: 56.25%; }

/* -------- Guía de propagación (siempre visible) -------- */
.prop-guide {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px 24px;
}
.prop-guide > h3 { font-size: 1.2rem; margin-bottom: 16px; }

/* -------- Acordeón -------- */
.accordion { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.accordion-header {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-family: inherit; font-size: 1.1rem; font-weight: 700; text-align: left;
  padding: 18px 22px; background: var(--surface); color: var(--text);
  border: none; cursor: pointer; transition: var(--transition);
}
.accordion-header:hover { background: var(--surface-2); }
.accordion-chevron { transition: transform var(--transition); color: var(--accent); font-size: 1.2rem; }
.accordion-header[aria-expanded="true"] .accordion-chevron { transform: rotate(180deg); }
.accordion-body { padding: 0 22px 22px; }
.glossary { display: grid; grid-template-columns: 1fr; gap: 4px 18px; }
.glossary dt { font-weight: 800; color: var(--accent); margin-top: 12px; }
.glossary dd { color: var(--text-dim); }

/* -------- Formulario -------- */
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-row { display: flex; flex-direction: column; gap: 7px; }
.form-row label { font-weight: 700; }
.contact-form input, .contact-form textarea {
  font-family: inherit; font-size: 1rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 13px 15px; width: 100%;
  transition: var(--transition);
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent); }
.contact-form textarea { resize: vertical; }
.form-note { font-size: .88rem; color: var(--text-dim); text-align: center; }

/* -------- Footer -------- */
.site-footer { border-top: 1px solid var(--border); padding: 30px 20px; text-align: center; color: var(--text-dim); background: var(--bg-alt); }
.site-footer strong { color: var(--accent); }

/* -------- Back to top -------- */
.back-to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  font-size: 1.4rem; font-weight: 700; cursor: pointer;
  background: var(--accent); color: var(--accent-contrast); border: none;
  box-shadow: var(--shadow); opacity: 0; pointer-events: none;
  transform: translateY(12px); transition: var(--transition);
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* -------- Responsive -------- */
@media (min-width: 560px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 720px) {
  .utc-clock { display: inline-block; }
}
@media (min-width: 900px) {
  .main-nav { display: flex; }
  .nav-burger { display: none; }
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  .glossary { grid-template-columns: auto 1fr; align-items: start; }
  .glossary dt { margin-top: 0; }
  .glossary dd { margin-bottom: 8px; }
}

/* -------- Accesibilidad -------- */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }