/* =========================================================
   Personal Site — Zhao Zhangyi
   Three themes: editorial / terminal / journal
   ========================================================= */

:root {
  /* editorial (default) */
  --bg: #f6f4ef;
  --bg-2: #ecebe4;
  --fg: #151311;
  --fg-2: #5a554e;
  --fg-3: #8a857c;
  --rule: #1513111a;
  --accent: oklch(0.55 0.14 45); /* muted burnt orange */
  --accent-2: oklch(0.45 0.08 260); /* muted ink */
  --serif: "Source Serif 4", "Source Serif Pro", "Songti SC", "Noto Serif SC", Georgia, serif;
  --sans: "Inter", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --cjk-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --cjk-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 2px;
  --maxw: 1240px;
  --pad-x: clamp(20px, 4vw, 72px);
}

/* THEME: terminal */
html[data-theme="terminal"] {
  --bg: #0b0d0c;
  --bg-2: #121514;
  --fg: #d6e4d6;
  --fg-2: #8aa08a;
  --fg-3: #4e6050;
  --rule: #d6e4d622;
  --accent: oklch(0.82 0.17 135); /* phosphor green */
  --accent-2: oklch(0.78 0.15 60);
  --serif: var(--mono);
  --cjk-serif: var(--cjk-sans);
}

/* THEME: journal */
html[data-theme="journal"] {
  --bg: #efe7d6;
  --bg-2: #e3d8c0;
  --fg: #2c2418;
  --fg-2: #6b5e47;
  --fg-3: #9a8b6f;
  --rule: #2c241833;
  --accent: oklch(0.45 0.15 30); /* deep ink red */
  --accent-2: oklch(0.38 0.08 100);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--cjk-serif), var(--serif);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.5s ease, color 0.5s ease;
}

html[data-theme="terminal"] body {
  font-family: var(--mono);
}

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

/* =========================================================
   TOP NAV
   ========================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px var(--pad-x);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--rule);
}
.nav-brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.02em;
  display: flex; align-items: center; gap: 10px;
}
.nav-brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}
.nav-links {
  display: flex; gap: 28px;
  font-size: 13px;
  letter-spacing: 0.04em;
  font-family: var(--sans);
}
html[data-theme="terminal"] .nav-links { font-family: var(--mono); }
.nav-links a {
  text-decoration: none;
  color: var(--fg-2);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--fg); }
.nav-links a.active { color: var(--fg); }
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px; background: var(--accent);
}
@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  min-height: 100vh;
  padding: 140px var(--pad-x) 80px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  position: relative;
  overflow: hidden;
}
@media (min-width: 920px) {
  .hero { grid-template-columns: 1.3fr 1fr; align-items: center; gap: 80px; }
}

.hero-eyebrow {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 28px;
  display: flex; align-items: center; gap: 14px;
}
html[data-theme="terminal"] .hero-eyebrow { font-family: var(--mono); }
.hero-eyebrow::before {
  content: ""; width: 40px; height: 1px; background: var(--fg-3);
}

.hero h1 {
  font-family: var(--cjk-serif);
  font-size: clamp(48px, 8vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  font-weight: 500;
}
.hero h1 .en {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.4em;
  color: var(--fg-3);
  letter-spacing: 0.04em;
  margin-top: 18px;
  font-weight: 400;
}
html[data-theme="terminal"] .hero h1 .en {
  font-style: normal;
  letter-spacing: 0.1em;
}

.hero-roles {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.role-chip {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 7px 14px;
  border: 1px solid var(--rule);
  border-radius: 100px;
  color: var(--fg-2);
  background: var(--bg-2);
  transition: all 0.3s;
}
html[data-theme="terminal"] .role-chip {
  font-family: var(--mono);
  border-radius: 0;
  border-color: var(--accent);
  color: var(--accent);
}
.role-chip:hover {
  color: var(--fg);
  border-color: var(--accent);
}

.hero-tagline {
  margin-top: 40px;
  max-width: 560px;
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--fg-2);
}
.hero-tagline strong {
  color: var(--fg);
  font-weight: 600;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px 48px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
  max-width: 560px;
}
.meta-item { }
.meta-label {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}
html[data-theme="terminal"] .meta-label { font-family: var(--mono); }
.meta-value {
  font-size: 15px;
  color: var(--fg);
  font-weight: 500;
}

/* Portrait placeholder */
.hero-portrait {
  position: relative;
  aspect-ratio: 4/5;
  max-width: 420px;
  justify-self: end;
  width: 100%;
}
@media (max-width: 920px) {
  .hero-portrait { max-width: 300px; justify-self: start; }
}
.portrait-frame {
  width: 100%; height: 100%;
  border: 1px solid var(--rule);
  background: var(--bg-2);
  position: relative;
  overflow: hidden;
}
.portrait-svg {
  width: 100%; height: 100%;
}
.portrait-label {
  position: absolute;
  bottom: 12px; left: 12px; right: 12px;
  display: flex; justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--fg-3);
  text-transform: uppercase;
}
.portrait-tag {
  position: absolute;
  top: -14px; right: 18px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 14px;
  color: var(--fg-3);
  background: var(--bg);
  padding: 0 10px;
}
html[data-theme="terminal"] .portrait-tag { font-style: normal; font-family: var(--mono); }

/* Floating corner marks (editorial flourish) */
.hero-marks {
  position: absolute;
  inset: 100px var(--pad-x) 40px;
  pointer-events: none;
}
.mark {
  position: absolute;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--fg-3);
  text-transform: uppercase;
}
.mark.tl { top: 0; left: 0; }
.mark.tr { top: 0; right: 0; text-align: right; }
.mark.bl { bottom: 0; left: 0; }
.mark.br { bottom: 0; right: 0; text-align: right; }

/* Scroll indicator */
.scroll-hint {
  position: absolute;
  bottom: 24px; left: 50%; transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--fg-3);
  text-transform: uppercase;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  animation: bob 2s infinite;
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 6px); }
}
.scroll-hint .line { width: 1px; height: 28px; background: var(--fg-3); }

/* =========================================================
   SECTIONS
   ========================================================= */
section.block {
  padding: 120px var(--pad-x);
  position: relative;
  border-top: 1px solid var(--rule);
}
section.block:nth-child(even) {
  background: var(--bg-2);
}

.block-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 72px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .section-head {
    grid-template-columns: 180px 1fr auto;
    align-items: end;
    gap: 40px;
  }
}
.section-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fg-3);
}
.section-title {
  font-family: var(--cjk-serif);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  margin: 0;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.section-title .en {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.36em;
  color: var(--fg-3);
  margin-top: 10px;
  letter-spacing: 0.04em;
  font-weight: 400;
}
html[data-theme="terminal"] .section-title .en {
  font-style: normal;
  font-family: var(--mono);
}
.section-side {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--fg-3);
  text-transform: uppercase;
  text-align: right;
}
html[data-theme="terminal"] .section-side { font-family: var(--mono); }

/* =========================================================
   ABOUT
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}
@media (min-width: 920px) {
  .about-grid { grid-template-columns: 2fr 1fr; gap: 80px; }
}
.about-prose {
  font-size: clamp(17px, 1.5vw, 22px);
  line-height: 1.6;
  color: var(--fg);
  max-width: 620px;
}
.about-prose p { margin: 0 0 1.2em; }
.about-prose .lead {
  font-size: clamp(22px, 2vw, 28px);
  line-height: 1.4;
  font-family: var(--cjk-serif);
  letter-spacing: -0.005em;
  margin-bottom: 1.4em;
}
.about-prose .accent { color: var(--accent); font-style: italic; }
html[data-theme="terminal"] .about-prose .accent { font-style: normal; }

.about-side {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.6;
}
html[data-theme="terminal"] .about-side { font-family: var(--mono); }
.about-side dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 20px;
}
.about-side dt {
  color: var(--fg-3);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-top: 2px;
}
.about-side dd {
  margin: 0;
  color: var(--fg);
  font-weight: 500;
}

/* =========================================================
   TIMELINE (Experience)
   ========================================================= */
.timeline {
  position: relative;
}
.tl-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  padding: 36px 0;
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  transition: padding 0.4s ease, background 0.3s;
}
@media (min-width: 720px) {
  .tl-row {
    grid-template-columns: 140px 80px 1fr auto;
    gap: 40px;
    align-items: start;
  }
}
.tl-row:hover {
  padding-left: 14px;
  padding-right: 14px;
}
.tl-row:hover .tl-arrow { transform: translateX(6px); color: var(--accent); }

.tl-year {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-3);
  letter-spacing: 0.08em;
  padding-top: 4px;
}
.tl-tag {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 4px 0;
}
html[data-theme="terminal"] .tl-tag { font-family: var(--mono); }

.tl-body h3 {
  margin: 0 0 4px;
  font-size: clamp(20px, 2vw, 26px);
  font-family: var(--cjk-serif);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.005em;
}
.tl-body .role {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--fg-2);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}
html[data-theme="terminal"] .tl-body .role { font-family: var(--mono); }
.tl-body .desc {
  font-size: 15px;
  color: var(--fg-2);
  line-height: 1.65;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s cubic-bezier(.3,.7,.3,1), opacity 0.3s, margin 0.3s;
}
.tl-row.open .tl-body .desc {
  max-height: 400px;
  opacity: 1;
  margin-top: 14px;
}
.tl-row.open .tl-arrow { transform: rotate(90deg); color: var(--accent); }
.tl-body ul {
  margin: 8px 0 0;
  padding-left: 0;
  list-style: none;
}
.tl-body ul li {
  position: relative;
  padding-left: 18px;
  margin: 6px 0;
  font-size: 14px;
  color: var(--fg-2);
}
.tl-body ul li::before {
  content: "→";
  position: absolute; left: 0;
  color: var(--accent);
  font-family: var(--mono);
}

.tl-arrow {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--fg-3);
  transition: transform 0.3s, color 0.3s;
  padding-top: 6px;
  align-self: start;
}

/* =========================================================
   PROJECTS
   ========================================================= */
.projects {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 720px) {
  .projects { grid-template-columns: 1fr 1fr; gap: 32px; }
}
.project {
  border: 1px solid var(--rule);
  padding: 36px 32px;
  background: var(--bg);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
html[data-theme="terminal"] .project {
  border-color: var(--accent);
}
.project:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.project::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s cubic-bezier(.3,.7,.3,1);
}
.project:hover::after { transform: scaleX(1); }

.project-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 20px;
}
.project h3 {
  font-family: var(--cjk-serif);
  font-size: 26px;
  font-weight: 500;
  line-height: 1.25;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}
.project .p-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-2);
  margin-bottom: 24px;
}
.project .p-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 20px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}
.p-stat .n {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--fg);
  display: block;
}
html[data-theme="terminal"] .p-stat .n { font-family: var(--mono); }
.p-stat .l {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-top: 4px;
}
html[data-theme="terminal"] .p-stat .l { font-family: var(--mono); }

/* =========================================================
   EDGE — the crossover section
   ========================================================= */
.edges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .edges { grid-template-columns: repeat(3, 1fr); }
}
.edge {
  background: var(--bg);
  padding: 44px 36px;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: background 0.3s;
}
.edge:hover { background: var(--bg-2); }
.edge-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 48px;
  color: var(--accent);
  line-height: 1;
  font-weight: 500;
}
html[data-theme="terminal"] .edge-num { font-style: normal; font-family: var(--mono); }
.edge h4 {
  font-family: var(--cjk-serif);
  font-size: 22px;
  font-weight: 500;
  margin: 20px 0 14px;
  line-height: 1.3;
}
.edge p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-2);
  margin: 0;
}

/* =========================================================
   AWARDS strip
   ========================================================= */
.awards {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.award {
  font-family: var(--sans);
  font-size: 13px;
  padding: 10px 18px;
  border: 1px solid var(--rule);
  border-radius: 100px;
  color: var(--fg);
  letter-spacing: 0.02em;
  background: var(--bg);
  transition: all 0.3s;
}
html[data-theme="terminal"] .award { font-family: var(--mono); border-radius: 0; }
.award:hover { border-color: var(--accent); color: var(--accent); }
.award .star { color: var(--accent); margin-right: 6px; }

/* =========================================================
   CONTACT / FOOTER
   ========================================================= */
.contact {
  padding: 140px var(--pad-x) 80px;
  border-top: 1px solid var(--rule);
}
.contact-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
}
@media (min-width: 720px) {
  .contact-inner { grid-template-columns: 1.4fr 1fr; }
}
.contact h2 {
  font-family: var(--cjk-serif);
  font-size: clamp(44px, 6vw, 80px);
  line-height: 1;
  margin: 0 0 24px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.contact h2 .en {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.38em;
  color: var(--fg-3);
  margin-top: 12px;
  letter-spacing: 0.04em;
  font-weight: 400;
}
html[data-theme="terminal"] .contact h2 .en { font-style: normal; font-family: var(--mono); }

.contact-list {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
}
.contact-list li {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
  cursor: pointer;
  transition: padding 0.3s;
}
.contact-list li:hover { padding-left: 12px; }
.contact-list li:hover .c-arrow { transform: translateX(4px); color: var(--accent); }
.contact-list .c-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fg-3);
  text-transform: uppercase;
}
.contact-list .c-val {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.02em;
}
.c-arrow {
  font-family: var(--mono);
  color: var(--fg-3);
  transition: all 0.3s;
}

.footer-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--fg-3);
  text-transform: uppercase;
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* =========================================================
   Ask-me chat (small interactive element)
   ========================================================= */
.ask-card {
  border: 1px solid var(--rule);
  background: var(--bg-2);
  padding: 28px;
  position: relative;
}
html[data-theme="terminal"] .ask-card { border-color: var(--accent); }
.ask-card h5 {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin: 0 0 14px;
  font-weight: 500;
}
html[data-theme="terminal"] .ask-card h5 { font-family: var(--mono); }
.ask-card .ask-q {
  font-family: var(--cjk-serif);
  font-size: 20px;
  line-height: 1.4;
  margin: 0 0 18px;
  letter-spacing: -0.005em;
}
.ask-input-row {
  display: flex;
  gap: 8px;
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}
.ask-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 14px;
  color: var(--fg);
  padding: 8px 0;
}
.ask-input::placeholder { color: var(--fg-3); }
.ask-btn {
  background: var(--fg);
  color: var(--bg);
  border: none;
  padding: 8px 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s;
}
.ask-btn:hover { background: var(--accent); color: #fff; }
.ask-answer {
  margin-top: 16px;
  padding: 14px 0 0;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-2);
  min-height: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s, opacity 0.3s, padding 0.3s;
}
.ask-answer.show {
  max-height: 400px;
  opacity: 1;
  padding: 14px 0 0;
  margin-top: 16px;
}
.ask-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.ask-chip {
  font-family: var(--mono);
  font-size: 11px;
  padding: 5px 10px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--fg-2);
  cursor: pointer;
  transition: all 0.2s;
}
.ask-chip:hover { border-color: var(--accent); color: var(--accent); }

.cursor-blink::after {
  content: "▊";
  color: var(--accent);
  animation: blink 1s infinite;
  margin-left: 2px;
  font-weight: normal;
}
@keyframes blink { 50% { opacity: 0; } }

/* =========================================================
   TWEAKS PANEL
   ========================================================= */
.tweaks {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 100;
  width: 280px;
  background: var(--bg);
  border: 1px solid var(--fg);
  padding: 20px;
  font-family: var(--sans);
  display: none;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}
html[data-theme="terminal"] .tweaks { font-family: var(--mono); }
.tweaks.show { display: block; }
.tweaks h6 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin: 0 0 16px;
  color: var(--fg-3);
  font-weight: 500;
  display: flex;
  justify-content: space-between;
}
.tweak-row {
  margin-bottom: 14px;
}
.tweak-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 6px;
}
.tweak-btns {
  display: flex;
  gap: 4px;
}
.tweak-btn {
  flex: 1;
  padding: 8px 6px;
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--fg-2);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.2s;
}
.tweak-btn.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.tweak-btn:hover:not(.active) {
  border-color: var(--accent);
  color: var(--accent);
}

/* =========================================================
   MOTION — reveal on scroll
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s cubic-bezier(.2,.6,.2,1), transform 0.8s cubic-bezier(.2,.6,.2,1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}