/* =========================================================
   Senado Partners — Bold Tech v2
   Typography-first. Geometric. Saturated cyan accent.
   ========================================================= */

:root {
  /* Palette — pure greyscale */
  --bg:           #000000;  /* pure black, deepest backgrounds */
  --bg-2:         #0a0a0a;  /* charcoal, primary surfaces */
  --bg-3:         #141414;  /* secondary surfaces */
  --border:       #1f1f1f;  /* subtle borders */
  --border-strong:#2d2d2d;  /* stronger borders */
  --text:         #ffffff;  /* white, primary text + emphasis */
  --text-mute:    #9a9a9a;  /* medium grey, secondary text */
  --text-dim:     #5a5a5a;  /* dim grey, tertiary */
  --accent:       #ffffff;  /* white, key emphasis */
  --accent-bright:#ffffff;
  --accent-glow:  rgba(255, 255, 255, 0.14);
  --accent-deep:  rgba(255, 255, 255, 0.45);
  --accent-soft:  rgba(255, 255, 255, 0.05);

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, Monaco, monospace;
  --font-zh:      'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;

  /* Layout */
  --max-w: 1280px;
  --pad-x: clamp(1.25rem, 4vw, 3rem);

  /* Motion */
  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 15px;
  line-height: 1.6;
  font-weight: 400;
  letter-spacing: 0.005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body.lang-zh { font-family: var(--font-zh); letter-spacing: 0; line-height: 1.7; }
body.lang-zh .mono-keep { font-family: var(--font-mono); }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }

::selection { background: var(--accent); color: var(--bg); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--bg);
  padding: .5rem 1rem; z-index: 1000; font-weight: 600;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

/* =========================================================
   NAVIGATION
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  background: rgba(0, 0, 0, 0.55);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease);
}
.nav.scrolled {
  background: rgba(0, 0, 0, 0.85);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.1rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: 0.02em;
}
.brand-mark {
  width: 12px; height: 12px;
  background: var(--accent);
  position: relative;
  transform: rotate(45deg);
  box-shadow: 0 0 12px var(--accent-deep);
}
.brand-mark::after {
  content: ''; position: absolute; inset: 3px;
  background: var(--bg);
}
.brand-slash {
  color: var(--accent);
  margin: 0 .15em;
  font-weight: 500;
}

.nav-links {
  display: flex;
  gap: 2rem;
  font-size: .8rem;
  color: var(--text-mute);
  font-weight: 500;
}
.nav-links a {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  position: relative;
  padding: .25rem 0;
  transition: color .2s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-num {
  font-family: var(--font-mono);
  font-size: .65rem;
  color: var(--accent);
  font-weight: 500;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s var(--ease);
}
.nav-links a:hover::after { transform: scaleX(1); }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .55rem .9rem;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  color: var(--text-mute);
  letter-spacing: 0.05em;
  transition: all .2s var(--ease);
}
.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--text);
  box-shadow: 0 0 0 1px var(--accent-soft) inset;
}
.lang-divider { color: var(--text-dim); }
body.lang-en .lang-en-tab { color: var(--accent); }
body.lang-zh .lang-zh-tab { color: var(--accent); }

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: transparent;
}
.scroll-progress > span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-deep);
  transition: width .1s linear;
}

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: stretch;
  overflow: hidden;
  padding-top: 7rem;
  padding-bottom: 5rem;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    radial-gradient(ellipse 60% 40% at 80% 20%, rgba(255, 255, 255, 0.05), transparent 60%),
    radial-gradient(ellipse 70% 50% at 0% 100%, rgba(255, 255, 255, 0.035), transparent 60%),
    linear-gradient(180deg, transparent 70%, var(--bg) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 3rem;
}

.hero-meta-top {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hero-id {
  color: var(--accent);
  padding: .35rem .65rem;
  border: 1px solid var(--accent-deep);
  background: var(--accent-soft);
}
.hero-tag { color: var(--text-mute); }
body.lang-zh .hero-meta-top { letter-spacing: 0.05em; }

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 17vw, 16rem);
  font-weight: 500;
  line-height: 0.86;
  letter-spacing: -0.045em;
  color: var(--text);
  margin: 0;
  text-wrap: balance;
}
body.lang-zh .hero-title {
  font-size: clamp(3.5rem, 14vw, 13rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 0.92;
}

/* Letter split & reveal */
.hero-title .line {
  display: block;
  overflow: hidden;
  padding: 0.05em 0;
}
.hero-title .char {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1.1s var(--ease-out);
  will-change: transform;
}
.hero-title.is-split .char {
  transition-delay: calc(var(--i, 0) * 35ms + 100ms);
}
.hero-title.is-in .char { transform: translateY(0); }

.hero-meta-bottom {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem 3rem;
  align-items: end;
}
.hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 400;
  color: var(--text-mute);
  max-width: 36ch;
  line-height: 1.5;
}
.hero-tagline::before {
  content: '';
  display: block;
  width: 32px; height: 1px;
  background: var(--accent);
  margin-bottom: 1rem;
}
.hero-coords {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}
.hero-coords .coord-sep { color: var(--accent); }

@media (max-width: 720px) {
  .hero-meta-bottom { grid-template-columns: 1fr; }
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .65rem;
  z-index: 3;
}
.scroll-line {
  width: 1px; height: 36px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2.4s ease-in-out infinite;
  transform-origin: top;
}
@keyframes scrollPulse {
  0%, 100% { transform: scaleY(0.4); opacity: 0.4; }
  50%      { transform: scaleY(1);   opacity: 1;   }
}

/* =========================================================
   MARQUEE STRIP
   ========================================================= */
.marquee {
  position: relative;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
  overflow: hidden;
  padding: 1.4rem 0;
}
.marquee-track {
  display: flex;
  gap: 2.5rem;
  white-space: nowrap;
  animation: marquee 38s linear infinite;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  width: max-content;
}
.marquee-track .m-item { color: var(--text); }
.marquee-track .m-sep {
  color: var(--accent);
  font-size: .75rem;
  align-self: center;
  transform: translateY(-1px);
}
@keyframes marquee {
  to { transform: translateX(-50%); }
}
body.lang-zh .marquee-track { font-weight: 600; }

/* =========================================================
   SECTIONS — shared
   ========================================================= */
.section {
  position: relative;
  padding: clamp(5rem, 11vw, 10rem) 0;
}

.chapter {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.chapter-line {
  height: 1px;
  background: var(--border-strong);
  flex: 0 0 5rem;
}
.chapter-line-grow {
  flex: 1;
  background: linear-gradient(to right, var(--border-strong), transparent);
}
.chapter-text {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--accent);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7.5vw, 6.5rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.035em;
  color: var(--text);
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  text-wrap: balance;
}
body.lang-zh .section-title {
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

/* Word split & reveal for section titles */
.section-title .word {
  display: inline-block;
  overflow: hidden;
  padding: 0.08em 0;
  vertical-align: top;
}
.section-title .word-inner {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 0.9s var(--ease-out);
  will-change: transform;
}
.section-title.is-split .word {
  margin-right: 0.22em;
}
.section-title.is-split .word:last-child { margin-right: 0; }
body.lang-zh .section-title.is-split .word { margin-right: 0.06em; }
.section-title.is-split .word-inner {
  transition-delay: calc(var(--i, 0) * 80ms + 80ms);
}
.section-title.is-in .word-inner { transform: translateY(0); }

/* =========================================================
   VISION
   ========================================================= */
.vision-body { max-width: 60ch; }
.placeholder {
  display: inline-flex;
  align-items: baseline;
  gap: .35rem;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  padding: 1.5rem 1.75rem;
  border: 1px solid var(--border-strong);
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  text-transform: uppercase;
}
.placeholder .ph-bracket { color: var(--accent); }
body.lang-zh .placeholder {
  font-family: var(--font-zh);
  letter-spacing: 0;
  font-weight: 500;
}

/* =========================================================
   APPROACH
   ========================================================= */
.approach-lead {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.75rem);
  font-weight: 400;
  line-height: 1.45;
  color: var(--text);
  max-width: 56ch;
  margin-bottom: clamp(3rem, 6vw, 5rem);
  letter-spacing: -0.01em;
}
.approach-rows {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}
.approach-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 2rem;
  padding: clamp(2rem, 4vw, 3rem) 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: background .3s var(--ease);
}
.approach-row::before {
  content: '';
  position: absolute;
  left: 0; top: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width .8s var(--ease-out);
  box-shadow: 0 0 8px var(--accent-deep);
}
.approach-row.is-in::before { width: 100%; }
.approach-row:hover {
  background: linear-gradient(90deg, var(--accent-soft), transparent 70%);
}
.row-num {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: .35rem;
}
.row-body h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: .85rem;
  color: var(--text);
}
body.lang-zh .row-body h3 { font-weight: 600; letter-spacing: 0; }
.row-body p {
  color: var(--text-mute);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 60ch;
}

@media (max-width: 720px) {
  .approach-row { grid-template-columns: 1fr; gap: 1rem; }
  .row-num { padding-top: 0; }
}

/* =========================================================
   FOUNDER
   ========================================================= */
.founder-grid {
  display: grid;
  grid-template-columns: minmax(0, 320px) 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.founder-mark {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-strong);
  border-bottom: 1px solid var(--border-strong);
  position: relative;
}
.founder-mark::before,
.founder-mark::after {
  content: '';
  position: absolute;
  width: 8px; height: 8px;
  border: 1px solid var(--accent);
}
.founder-mark::before { top: -4px; left: -4px; border-right: none; border-bottom: none; }
.founder-mark::after  { bottom: -4px; right: -4px; border-left: none; border-top: none; }
.age-num {
  font-family: var(--font-display);
  font-size: clamp(7rem, 14vw, 12rem);
  font-weight: 500;
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--accent);
  text-shadow: 0 0 40px var(--accent-glow);
}
.age-meta {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.age-label {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.1em;
}
.age-sub {
  font-family: var(--font-mono);
  font-size: .65rem;
  font-weight: 500;
  color: var(--text-dim);
  letter-spacing: 0.18em;
}

.bio-list {
  display: flex;
  flex-direction: column;
}
.bio-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 2rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--border);
  align-items: baseline;
}
.bio-row:first-child { border-top: none; padding-top: 0; }
.bio-key {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
body.lang-zh .bio-key { letter-spacing: 0.05em; font-family: var(--font-zh); font-weight: 600; }
.bio-val {
  font-size: .98rem;
  color: var(--text);
  line-height: 1.6;
  max-width: 56ch;
}

@media (max-width: 860px) {
  .founder-grid { grid-template-columns: 1fr; }
  .founder-mark { width: max-content; }
}
@media (max-width: 600px) {
  .bio-row { grid-template-columns: 1fr; gap: .35rem; }
}

/* =========================================================
   FORWARD
   ========================================================= */
.forward-text {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-weight: 400;
  line-height: 1.5;
  color: var(--text);
  max-width: 60ch;
  margin-bottom: 2.5rem;
  letter-spacing: -0.01em;
}
.forward-status {
  display: inline-flex;
  align-items: center;
  gap: .85rem;
  padding: .85rem 1.2rem;
  border: 1px solid var(--accent-deep);
  background: var(--accent-soft);
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text);
  text-transform: uppercase;
}
body.lang-zh .forward-status { letter-spacing: 0.05em; font-family: var(--font-zh); }
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-deep);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-deep); }
  50%      { box-shadow: 0 0 0 8px rgba(255, 255, 255, 0); }
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: clamp(2rem, 5vw, 4rem);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-brand-block {
  display: flex;
  align-items: center;
  gap: .75rem;
}
.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .85rem;
  letter-spacing: 0.02em;
}
.footer-meta {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

/* =========================================================
   REVEAL — directional staggered motion
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s var(--ease-out), transform .9s var(--ease-out);
}
.reveal.is-in,
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.approach-row.reveal { transform: translateX(-24px); }
.approach-row.reveal.is-in { transform: translateX(0); }

.bio-row.reveal { transform: translateX(20px); }
.bio-row.reveal.is-in { transform: translateX(0); transition-delay: calc(var(--i, 0) * 60ms); }

.chapter.reveal { transform: translateY(0); }
.chapter.reveal.is-in .chapter-line { animation: lineGrow .9s var(--ease-out) both; }
.chapter.reveal.is-in .chapter-line-grow { animation-delay: .1s; }
@keyframes lineGrow {
  from { transform: scaleX(0); transform-origin: left; opacity: 0; }
  to   { transform: scaleX(1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .hero-title .char, .section-title .word-inner { transform: none; }
  .marquee-track { animation: none; }
}