/* ===== ECHOGRAPHIE.CSS ===== */
@import url('https://fonts.googleapis.com/css2?family=Lexend+Mega:wght@300;400;600;700&family=Noto+Serif:ital,wght@0,300;0,400;1,300;1,400&family=JetBrains+Mono:wght@300;400;500&display=swap');

:root {
  --abyss:      #020b18;
  --deep:       #040f22;
  --mid-blue:   #07193a;
  --card:       #0a2040;
  --panel:      #0d2750;
  --cyan:       #00cfdd;
  --cyan-soft:  #4de3ee;
  --cyan-pale:  rgba(0,207,221,0.12);
  --cyan-glow:  rgba(0,207,221,0.25);
  --sky:        #38bdf8;
  --text:       #ddf4f7;
  --muted:      #5b8a96;
  --border:     rgba(0,207,221,0.18);
  --warn:       #f59e0b;
  --ok:         #34d399;
  --font-head:  'Lexend Mega', sans-serif;
  --font-body:  'Noto Serif', serif;
  --font-mono:  'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--abyss);
  color: var(--text);
  line-height: 1.75;
  overflow-x: hidden;
}

/* Sonar grid bg */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse 80% 80% at 50% 50%, rgba(0,207,221,0.03) 0%, transparent 70%),
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(0,207,221,0.04) 39px, rgba(0,207,221,0.04) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(0,207,221,0.04) 39px, rgba(0,207,221,0.04) 40px);
  pointer-events: none; z-index: 0;
}

/* Bottom glow */
body::after {
  content: '';
  position: fixed; bottom: 0; left: 0; right: 0; height: 300px;
  background: linear-gradient(to top, rgba(0,207,221,0.04), transparent);
  pointer-events: none; z-index: 0;
}

/* ── PROGRESS ── */
#progress-bar {
  position: fixed; top: 0; left: 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--sky));
  width: 0%; z-index: 200;
  box-shadow: 0 0 10px var(--cyan);
  transition: width .1s;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 62px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 3rem;
  background: rgba(2,11,24,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex; align-items: center; gap: .75rem;
  text-decoration: none;
}
.nav-wave-icon {
  width: 34px; height: 34px;
  border: 1.5px solid var(--cyan);
  border-radius: 50%;
  display: grid; place-items: center;
  box-shadow: 0 0 10px var(--cyan-pale);
}
.nav-wave-icon svg { width: 18px; height: 18px; }
.nav-title {
  font-family: var(--font-head); font-size: .82rem; font-weight: 600;
  color: var(--text); letter-spacing: .04em;
}

.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-family: var(--font-mono); font-size: .72rem;
  color: var(--muted); text-decoration: none;
  letter-spacing: .08em; transition: color .2s;
}
.nav-links a:hover { color: var(--cyan); }

.nav-freq {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--cyan); background: var(--cyan-pale);
  border: 1px solid var(--border);
  padding: .28rem .8rem; border-radius: 100px;
}

/* ── HERO ── */
.hero {
  position: relative; z-index: 1;
  min-height: 100vh;
  display: grid; grid-template-columns: 55% 45%;
  align-items: center; gap: 3rem;
  padding: 8rem 3rem 4rem;
  overflow: hidden;
}

/* Sonar rings bg */
.sonar-bg {
  position: absolute; right: -80px; top: 50%; transform: translateY(-50%);
  width: 600px; height: 600px;
  pointer-events: none;
}

.hero-tag {
  font-family: var(--font-mono); font-size: .7rem;
  color: var(--cyan); letter-spacing: .22em; text-transform: uppercase;
  margin-bottom: 1.2rem; display: flex; align-items: center; gap: .7rem;
}
.hero-tag::before { content: ''; width: 24px; height: 1px; background: var(--cyan); }

.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  font-weight: 700; line-height: 1.05; letter-spacing: -.01em;
  color: var(--text); margin-bottom: 1.2rem;
}
.hero h1 em { font-style: italic; color: var(--cyan); font-family: var(--font-body); }

.hero-desc {
  font-size: .95rem; color: var(--muted);
  max-width: 480px; line-height: 1.85;
  margin-bottom: 2.5rem; font-weight: 300;
}

.hero-metrics { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.hm { display: flex; flex-direction: column; }
.hm-n {
  font-family: var(--font-head); font-size: 2rem; font-weight: 700;
  color: var(--cyan); line-height: 1;
}
.hm-l { font-family: var(--font-mono); font-size: .65rem; color: var(--muted); letter-spacing: .1em; text-transform: uppercase; margin-top: .3rem; }

/* ── SONOGRAM PANEL (hero right) ── */
.sono-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden;
}
.sono-header {
  background: var(--mid-blue); padding: .7rem 1.2rem;
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--border);
}
.sono-header-left {
  font-family: var(--font-mono); font-size: .68rem; color: var(--cyan); letter-spacing: .1em;
}
.sono-header-right {
  display: flex; gap: .5rem;
}
.sono-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.sono-screen {
  background: #000d1a; height: 200px;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
}
.sono-canvas { width: 100%; height: 100%; }
.sono-data { padding: 1rem 1.2rem; display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.sono-val {
  display: flex; flex-direction: column;
}
.sono-val-n { font-family: var(--font-mono); font-size: .88rem; color: var(--cyan); font-weight: 500; }
.sono-val-l { font-family: var(--font-mono); font-size: .6rem; color: var(--muted); letter-spacing: .08em; text-transform: uppercase; }

/* ── SEC WRAP ── */
.sec { position: relative; z-index: 1; max-width: 1160px; margin: 0 auto; padding: 5rem 3rem; }

.shead { margin-bottom: 3rem; display: flex; align-items: center; gap: 1rem; }
.shead-num { font-family: var(--font-mono); font-size: .7rem; color: var(--cyan); letter-spacing: .18em; flex-shrink: 0; }
.shead-title { font-family: var(--font-head); font-size: clamp(1.4rem, 2.5vw, 2.2rem); font-weight: 600; }
.shead-line { flex: 1; height: 1px; background: var(--border); margin-left: .8rem; }

/* ── MODES GRID ── */
.modes-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 1.5px; background: var(--border); border: 1px solid var(--border);
}
.mode-card {
  background: var(--card); padding: 2rem;
  transition: background .25s; position: relative; overflow: hidden;
  cursor: default;
}
.mode-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--sky));
  transform: scaleX(0); transform-origin: left;
  transition: transform .4s;
}
.mode-card:hover::after { transform: scaleX(1); }
.mode-card:hover { background: var(--mid-blue); }

.mode-code {
  font-family: var(--font-mono); font-size: .65rem; color: var(--cyan);
  letter-spacing: .2em; text-transform: uppercase; margin-bottom: .7rem;
}
.mode-name {
  font-family: var(--font-head); font-size: 1.05rem; font-weight: 600;
  margin-bottom: .7rem; color: var(--text);
}
.mode-desc { font-size: .86rem; color: var(--muted); line-height: 1.75; }
.mode-freq {
  margin-top: 1rem; font-family: var(--font-mono); font-size: .7rem;
  color: var(--sky); background: rgba(56,189,248,.1);
  border: 1px solid rgba(56,189,248,.2); padding: .25rem .6rem;
  border-radius: 2px; display: inline-block;
}

/* ── FREQ TABLE ── */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 4px; }
table { width: 100%; border-collapse: collapse; font-size: .86rem; }
thead { background: var(--panel); }
th {
  font-family: var(--font-mono); font-size: .67rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--cyan);
  padding: .9rem 1.2rem; text-align: left; border-bottom: 1px solid var(--border);
}
td { padding: .9rem 1.2rem; border-bottom: 1px solid rgba(0,207,221,.06); color: var(--text); vertical-align: top; }
tr:hover td { background: rgba(0,207,221,.04); }
tr:last-child td { border-bottom: none; }

.freq-badge {
  font-family: var(--font-mono); font-size: .68rem; padding: .18rem .55rem;
  border-radius: 2px; text-transform: uppercase; letter-spacing: .06em;
  background: var(--cyan-pale); color: var(--cyan-soft); border: 1px solid var(--border);
}

/* ── TIMELINE VERTICAL ── */
.timeline { position: relative; padding-left: 2.5rem; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 1px; background: linear-gradient(to bottom, var(--cyan), transparent);
}
.tl-item {
  position: relative; margin-bottom: 2.5rem;
  opacity: 0; transform: translateX(-12px);
  transition: opacity .5s, transform .5s;
}
.tl-item.visible { opacity: 1; transform: translateX(0); }
.tl-item::before {
  content: ''; position: absolute;
  left: -2.6rem; top: .3rem;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--abyss); border: 2px solid var(--cyan);
  box-shadow: 0 0 8px var(--cyan-pale);
}
.tl-year {
  font-family: var(--font-mono); font-size: .7rem; color: var(--cyan);
  letter-spacing: .15em; text-transform: uppercase; margin-bottom: .3rem;
}
.tl-event { font-family: var(--font-head); font-size: .95rem; font-weight: 600; margin-bottom: .4rem; }
.tl-desc { font-size: .86rem; color: var(--muted); line-height: 1.7; max-width: 640px; }

/* ── ARTIFACT CARDS ── */
.artifact-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem;
}
.artifact-card {
  background: var(--card); border: 1px solid var(--border); padding: 1.5rem;
  transition: border-color .25s, transform .25s;
}
.artifact-card:hover { border-color: var(--cyan); transform: translateY(-2px); }
.art-icon { font-size: 1.5rem; margin-bottom: .7rem; }
.art-name { font-family: var(--font-head); font-size: .9rem; font-weight: 600; margin-bottom: .4rem; }
.art-desc { font-size: .8rem; color: var(--muted); line-height: 1.65; }
.art-type { margin-top: .6rem; font-family: var(--font-mono); font-size: .64rem; color: var(--warn); }

/* ── INFO BOX ── */
.infobox {
  background: var(--cyan-pale); border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  padding: 1.2rem 1.5rem; border-radius: 4px;
  font-size: .87rem; color: var(--text); line-height: 1.75; margin-top: 1rem;
}
.warnbox {
  background: rgba(245,158,11,.07); border: 1px solid rgba(245,158,11,.2);
  border-left: 3px solid var(--warn);
  padding: 1.2rem 1.5rem; border-radius: 4px;
  font-size: .87rem; color: rgba(245,158,11,.9); line-height: 1.75; margin-top: 1rem;
}

/* ── FADE IN ── */
.fi { opacity: 0; transform: translateY(16px); transition: opacity .6s, transform .6s; }
.fi.visible { opacity: 1; transform: translateY(0); }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border); padding: 2rem 3rem; z-index: 1; position: relative;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
}
.ft { font-family: var(--font-mono); font-size: .7rem; color: var(--muted); }

@media(max-width:900px){
  .hero { grid-template-columns: 1fr; padding: 7rem 1.2rem 3rem; }
  .sono-panel { display: none; }
  nav { padding: 0 1.2rem; }
  .nav-links { display: none; }
  .sec { padding: 3rem 1.2rem; }
}