/* ============================================================
   Projeto Chama — Unified Stylesheet
   Polished with Impeccable design principles + GSAP utilities
   ============================================================ */

/* --- Design Tokens ----------------------------------------- */
:root {
  --bg: #f7f3eb; --bg2: #efe9df;
  --text: #18201d; --muted: #66716c;
  --panel: #fffdf9; --panel2: #f4efe6;
  --line: rgba(24,32,29,.13);
  --accent: #0d8a73; --accent2: #b78337;
  --danger: #b74646; --warn: #a06d21;
  --shadow: 0 24px 76px rgba(42,49,45,.11);
  --radius: 24px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Inter", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --ease-out: cubic-bezier(0, 0, .2, 1);
  --ease-spring: cubic-bezier(.175, .885, .32, 1.275);
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #07100d; --bg2: #0b1612;
  --text: #f3f7f4; --muted: #9da9a4;
  --panel: #0e1b16; --panel2: #12221b;
  --line: rgba(243,249,246,.13);
  --accent: #71dcc0; --accent2: #ddb978;
  --danger: #ff8585; --warn: #f0c46f;
  --shadow: 0 28px 90px rgba(0,0,0,.31);
  color-scheme: dark;
}

/* --- Reset & Base ------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
  margin: 0; color: var(--text);
  font-family: var(--sans); line-height: 1.68;
  min-height: 100vh;
  background:
    radial-gradient(circle at 7% -7%, color-mix(in srgb, var(--accent), transparent 87%), transparent 31rem),
    radial-gradient(circle at 98% 16%, color-mix(in srgb, var(--accent2), transparent 88%), transparent 34rem),
    linear-gradient(145deg, var(--bg), var(--bg2));
  transition: background .35s var(--ease), color .35s var(--ease);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grid overlay */
body::before {
  content: ""; position: fixed; inset: 0;
  pointer-events: none; z-index: -1; opacity: .13;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 52px 52px;
}

a { color: inherit; }
.wrap { width: min(1200px, calc(100% - 40px)); margin: auto; }

/* --- Focus Accessibility ----------------------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --- Navbar ------------------------------------------------ */
.top {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg), transparent 8%);
  backdrop-filter: blur(21px) saturate(145%);
  -webkit-backdrop-filter: blur(21px) saturate(145%);
  border-bottom: 1px solid var(--line);
}

.nav {
  position: relative;
  min-height: 76px; display: flex;
  align-items: center; gap: 15px;
}

.brand {
  display: flex; gap: 11px; align-items: center;
  text-decoration: none; font-weight: 900;
  letter-spacing: -.02em;
  transition: opacity .2s var(--ease);
}
.brand:hover { opacity: .8; }

.logo {
  width: 42px; height: 42px; border-radius: 14px;
  display: grid; place-items: center;
  background: linear-gradient(145deg, var(--accent2), var(--accent));
  color: white; font: 500 1.25rem var(--serif);
  box-shadow: 0 12px 34px color-mix(in srgb, var(--accent), transparent 80%);
  transition: transform .3s var(--ease-spring), box-shadow .3s var(--ease);
}
.brand:hover .logo {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 16px 44px color-mix(in srgb, var(--accent), transparent 65%);
}

.navlinks {
  display: flex; gap: 5px;
  margin-left: auto; align-items: center;
}
.navlinks a {
  text-decoration: none; color: var(--muted);
  font-size: .8rem; font-weight: 760;
  padding: 8px 12px; border: 1px solid transparent;
  border-radius: 999px;
  transition: all .2s var(--ease);
}
.navlinks a:hover, .navlinks a.on {
  color: var(--text);
  border-color: var(--line);
  background: var(--panel);
}

/* Theme toggle button */
.themebtn {
  border: 1px solid var(--line); background: var(--panel);
  color: var(--text); border-radius: 12px;
  padding: 8px 14px; font-weight: 850; cursor: pointer;
  transition: all .25s var(--ease);
  flex-shrink: 0;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .84rem;
}
.themebtn:hover {
  background: var(--panel2);
  border-color: color-mix(in srgb, var(--accent), transparent 50%);
  transform: scale(1.04);
}
.themebtn:active { transform: scale(.96); }

/* Theme Toggle Icon Box & Morphing */
.theme-icon-box {
  position: relative;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.theme-icon {
  position: absolute;
  inset: 0;
  width: 18px;
  height: 18px;
  color: var(--text);
  transition: transform .45s var(--ease-spring), opacity .3s var(--ease);
}

/* Light Theme: Sun visible, Moon morphed away */
html:not([data-theme="dark"]) .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #d97706;
}
html:not([data-theme="dark"]) .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.3);
}

/* Dark Theme: Moon visible, Sun morphed away */
html[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.3);
}
html[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #38bdf8;
}

/* Hamburger button — animated SVG Morphing (Menu ↔ X) */
.menubtn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border: 1px solid var(--line); background: var(--panel);
  border-radius: 12px; cursor: pointer;
  margin-left: auto; padding: 0;
  transition: background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  flex-shrink: 0;
}
.menubtn:hover {
  background: var(--panel2);
  border-color: color-mix(in srgb, var(--accent), transparent 50%);
}
.menubtn:active { transform: scale(.95); }

.menubtn .menu-svg {
  width: 22px; height: 22px;
  color: var(--text);
  display: block;
}

.menubtn .line {
  transition: transform .35s var(--ease-spring), opacity .25s var(--ease);
  transform-origin: 12px 12px;
  stroke: var(--text);
}

/* Active / Open state: lines morph into an X with spring physics */
.menubtn.active .line-top {
  transform: translateY(6px) rotate(45deg);
}
.menubtn.active .line-mid {
  opacity: 0;
  transform: scaleX(0);
}
.menubtn.active .line-bot {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile overlay backdrop */
.nav-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.35); z-index: 98;
  opacity: 0; transition: opacity .3s var(--ease);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.nav-overlay.visible { display: block; opacity: 1; }

/* --- Hero -------------------------------------------------- */
.hero { padding: 82px 0 44px; }
.hero-grid {
  display: grid; grid-template-columns: 1.2fr .8fr;
  gap: 34px; align-items: center;
}

.eyebrow {
  text-transform: uppercase; letter-spacing: .18em;
  font-size: .72rem; font-weight: 900; color: var(--accent);
}

h1, h2, h3 {
  font-family: var(--serif); font-weight: 500;
  line-height: 1.08; letter-spacing: -.035em;
}
h1 { font-size: clamp(3rem, 7vw, 6.6rem); margin: .12em 0 .22em; }
h2 { font-size: clamp(2rem, 4vw, 3.3rem); margin: .18em 0 .55em; }
h3 { font-size: 1.34rem; margin: .15em 0 .55em; }

.lead {
  font-size: clamp(1.03rem, 2vw, 1.26rem);
  max-width: 870px;
  color: color-mix(in srgb, var(--text), var(--muted) 40%);
}

/* --- Cards & Panels ---------------------------------------- */
.hero-card, .card, .callout, .step, .tablebox,
.atompanel, .side, .shopcard, .method-card, .checkblock {
  border: 1px solid var(--line);
  background: linear-gradient(155deg, var(--panel), var(--panel2));
  box-shadow: var(--shadow);
}

.hero-card, .card, .callout, .atompanel, .side,
.shopcard, .method-card, .checkblock {
  border-radius: var(--radius);
}

.hero-card, .card, .callout, .shopcard, .method-card, .checkblock {
  padding: 24px;
}

/* Card hover micro-interaction */
.card, .shopcard, .method-card {
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), border-color .35s var(--ease);
}
.card:hover, .shopcard:hover, .method-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 32px 90px rgba(42,49,45,.15);
}

/* --- Sections & Grids -------------------------------------- */
.section { padding: 45px 0; }
.section.sm { padding: 24px 0; }

.grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
}
.grid.two { grid-template-columns: repeat(2, 1fr); }
.grid.four { grid-template-columns: repeat(4, 1fr); }

/* --- Tags -------------------------------------------------- */
.tagrow { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.tag {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 7px 10px; border: 1px solid var(--line);
  border-radius: 999px; background: var(--panel);
  font-size: .77rem; color: var(--muted);
  transition: transform .2s var(--ease-spring);
}
.tag:hover { transform: scale(1.04); }

.dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--dot);
  box-shadow: 0 0 18px var(--dot);
}

/* --- Buttons ----------------------------------------------- */
.btnrow { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 21px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; padding: 11px 15px;
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--panel); font-size: .88rem; font-weight: 850;
  transition: all .25s var(--ease);
  position: relative; overflow: hidden;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
}
.btn:active {
  transform: translateY(0) scale(.97);
  transition-duration: .1s;
}

.btn.primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent2), var(--accent));
  color: white;
}
.btn.primary:hover {
  box-shadow: 0 12px 32px color-mix(in srgb, var(--accent), transparent 55%);
  filter: brightness(1.08);
}

/* --- Card Links -------------------------------------------- */
.cardlink {
  text-decoration: none; position: relative;
  transition: transform .35s var(--ease-out), border-color .35s var(--ease), box-shadow .35s var(--ease-out);
}
.cardlink:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent), transparent 45%);
  box-shadow: 0 32px 90px rgba(42,49,45,.15);
}
.cardlink::after {
  content: "";
  position: absolute; right: 20px; top: 20px;
  width: 18px; height: 18px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230d8a73' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 17 17 7'/%3E%3Cpath d='M7 7h10v10'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  opacity: .75;
  transition: transform .35s var(--ease-spring), opacity .25s var(--ease), filter .25s var(--ease);
}
html[data-theme="dark"] .cardlink::after {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2371dcc0' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 17 17 7'/%3E%3Cpath d='M7 7h10v10'/%3E%3C/svg%3E");
}
.cardlink:hover::after {
  transform: translate(3px, -3px) scale(1.15);
  opacity: 1;
  filter: drop-shadow(0 0 8px var(--accent));
}

/* --- Utility classes --------------------------------------- */
.muted { color: var(--muted); }
.small { font-size: .84rem; }
.tiny { font-size: .73rem; }
.rule { height: 1px; background: var(--line); margin: 24px 0; }

/* --- Steps ------------------------------------------------- */
.steps { counter-reset: steps; display: grid; gap: 14px; }

.step {
  position: relative; border-radius: 21px;
  padding: 23px 23px 23px 78px;
  transition: transform .3s var(--ease-out), box-shadow .3s var(--ease-out);
}
.step:hover {
  transform: translateX(4px);
  box-shadow: 0 28px 82px rgba(42,49,45,.14);
}

.step::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute; left: 20px; top: 20px;
  width: 40px; height: 40px; border-radius: 13px;
  display: grid; place-items: center;
  font-weight: 900;
  background: color-mix(in srgb, var(--accent), transparent 86%);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent), transparent 65%);
}

/* --- Equations --------------------------------------------- */
.eq {
  font: .92rem/1.7 var(--mono); overflow: auto;
  padding: 17px 19px;
  background: color-mix(in srgb, var(--accent), transparent 93%);
  border-left: 3px solid var(--accent);
  border-radius: 0 16px 16px 0; margin: 18px 0;
}

/* --- Callouts ---------------------------------------------- */
.callout.good {
  border-color: color-mix(in srgb, var(--accent), transparent 60%);
  background: color-mix(in srgb, var(--accent), transparent 94%);
}
.callout.warn {
  border-color: color-mix(in srgb, var(--warn), transparent 58%);
  background: color-mix(in srgb, var(--warn), transparent 94%);
}
.callout.danger {
  border-color: color-mix(in srgb, var(--danger), transparent 58%);
  background: color-mix(in srgb, var(--danger), transparent 95%);
}

/* --- Tables ------------------------------------------------ */
.tablebox { overflow: auto; border-radius: 22px; position: relative; }
/* Mobile scroll hint */
.tablebox::after {
  content: ""; position: absolute; right: 0; top: 0;
  width: 40px; height: 100%; pointer-events: none;
  background: linear-gradient(to right, transparent, color-mix(in srgb, var(--panel), transparent 20%));
  border-radius: 0 22px 22px 0;
  opacity: 0; transition: opacity .3s;
}

table {
  width: 100%; border-collapse: collapse; min-width: 760px;
}
th, td {
  padding: 14px 16px; border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  text-align: left; text-transform: uppercase;
  letter-spacing: .08em; font-size: .71rem;
  color: var(--muted); background: var(--panel2);
}
td { font-size: .91rem; }
tr:last-child td { border-bottom: 0; }
tr { transition: background .15s var(--ease); }
tr:hover td { background: color-mix(in srgb, var(--accent), transparent 96%); }

/* --- Student Layout (Experiment Pages) --------------------- */
.student-layout {
  display: grid; grid-template-columns: 245px 1fr;
  gap: 24px; align-items: start;
}

.side {
  position: sticky; top: 98px; padding: 17px;
}
.side b { display: block; margin: 4px 8px 8px; }
.side a {
  display: block; text-decoration: none; color: var(--muted);
  padding: 8px 9px; border-radius: 10px; font-size: .82rem;
  transition: all .2s var(--ease);
}
.side a:hover {
  background: var(--panel2); color: var(--text);
  transform: translateX(4px);
}

/* --- Flame Animation --------------------------------------- */
.flamebox { height: 265px; display: grid; place-items: end center; }

.flame {
  --flame: #ff4e50;
  width: 110px; height: 202px;
  background: radial-gradient(
    ellipse at 50% 74%,
    #fff 0 5%,
    color-mix(in srgb, var(--flame), white 30%) 13%,
    var(--flame) 31%,
    color-mix(in srgb, var(--flame), transparent 67%) 64%,
    transparent 72%
  );
  border-radius: 53% 47% 55% 45% / 66% 63% 37% 34%;
  filter: drop-shadow(0 0 25px var(--flame));
  transform-origin: 50% 100%;
  animation: flicker 1.1s ease-in-out infinite alternate;
}

@keyframes flicker {
  from { transform: rotate(-2deg) scaleX(.92) translateY(1px); }
  to   { transform: rotate(2deg) scaleX(1.05) translateY(-4px); }
}

/* --- Atom Diagram ------------------------------------------ */
.atompanel {
  padding: 27px; display: grid;
  grid-template-columns: 325px 1fr;
  gap: 28px; align-items: center; overflow: hidden;
}

.atom {
  width: 280px; height: 280px;
  position: relative; margin: auto;
}

.nucleus {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 68px; height: 68px; border-radius: 50%;
  display: grid; place-items: center;
  font: 900 1rem var(--mono); color: #08110e;
  background: radial-gradient(
    circle at 30% 28%,
    #fff 0 7%, var(--atom) 24%, #c6a768 64%, #67512b
  );
  box-shadow: 0 0 48px color-mix(in srgb, var(--atom), transparent 55%);
}

.orbit {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  border: 1px solid color-mix(in srgb, var(--text), transparent 78%);
  border-radius: 50%;
}
.o1 { width: 116px; height: 116px; }
.o2 { width: 186px; height: 186px; }
.o3 { width: 268px; height: 268px; }

.e {
  position: absolute; left: 50%; top: 50%;
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text);
  box-shadow: 0 0 12px var(--text);
  transform-origin: 0 0;
}
.e1 { animation: r1 2.8s linear infinite; }
.e2 { animation: r2 4.7s linear infinite; }
.e3 { animation: r3 6.4s linear infinite; }

@keyframes r1 {
  from { transform: rotate(0)      translateX(58px); }
  to   { transform: rotate(360deg) translateX(58px); }
}
@keyframes r2 {
  from { transform: rotate(120deg) translateX(93px); }
  to   { transform: rotate(480deg) translateX(93px); }
}
@keyframes r3 {
  from { transform: rotate(235deg) translateX(134px); }
  to   { transform: rotate(595deg) translateX(134px); }
}

/* --- Photon Track ------------------------------------------ */
.photontrack {
  height: 74px; border: 1px solid var(--line);
  border-radius: 16px; background: var(--panel2);
  position: relative; overflow: hidden; margin-top: 16px;
}
.photon {
  position: absolute; left: -100px; top: 34px;
  width: 88px; height: 5px; border-radius: 999px;
  background: var(--atom);
  box-shadow: 0 0 22px var(--atom);
  animation: fly 2.35s ease-in-out infinite;
}
@keyframes fly {
  0%   { left: -100px; opacity: 0; }
  12%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { left: calc(100% + 40px); opacity: 0; }
}

/* --- Shop Grid --------------------------------------------- */
.shopgrid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px;
}
.shopcard ul { padding-left: 18px; }
.shopcard li + li { margin-top: 7px; }

/* --- Checklist --------------------------------------------- */
.check {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 11px 12px; border: 1px solid var(--line);
  border-radius: 13px; background: var(--panel2); margin: 8px 0;
  transition: background .2s var(--ease);
}
.check:has(input:checked) {
  background: color-mix(in srgb, var(--accent), transparent 93%);
  border-color: color-mix(in srgb, var(--accent), transparent 70%);
}
.check input {
  margin-top: 5px; accent-color: var(--accent);
}

/* --- Method Cards ------------------------------------------ */
.method-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
}
.method-number {
  width: 38px; height: 38px; border-radius: 12px;
  display: grid; place-items: center; font-weight: 900;
  background: color-mix(in srgb, var(--accent), transparent 86%);
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent), transparent 65%);
}
.method-card ul { padding-left: 18px; }
.method-card li + li { margin-top: 6px; }

/* --- Details / Accordion ----------------------------------- */
details {
  border: 1px solid var(--line); background: var(--panel);
  border-radius: 15px; padding: 12px 14px;
  transition: border-color .2s var(--ease);
}
details + details { margin-top: 9px; }
details[open] { border-color: color-mix(in srgb, var(--accent), transparent 60%); }
summary {
  cursor: pointer; font-weight: 850;
  transition: color .2s var(--ease);
}
summary:hover { color: var(--accent); }

/* --- Footer ------------------------------------------------ */
footer {
  border-top: 1px solid var(--line);
  padding: 39px 0 64px; margin-top: 54px;
  color: var(--muted);
}
.footflex {
  display: flex; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
}

/* --- GSAP Animation Utilities ------------------------------ */
[data-gsap] {
  opacity: 0;
  will-change: transform, opacity;
}
[data-gsap="fade-up"]    { transform: translateY(40px); }
[data-gsap="fade-in"]    { transform: none; }
[data-gsap="fade-left"]  { transform: translateX(40px); }
[data-gsap="fade-right"] { transform: translateX(-40px); }
[data-gsap="scale-in"]   { transform: scale(.92); }
[data-gsap="stagger"]    { transform: translateY(30px); }

/* Visible state (set by GSAP or fallback) */
[data-gsap].gsap-visible {
  opacity: 1 !important;
  transform: none !important;
}

/* --- Responsive: Tablet & Mobile (≤980px) ------------------ */
@media (max-width: 980px) {
  .hero-grid, .student-layout, .atompanel {
    grid-template-columns: 1fr;
  }
  .grid, .grid.two, .grid.four, .shopgrid, .method-grid {
    grid-template-columns: 1fr;
  }

  /* Sidebar → horizontal scroll strip */
  .side {
    position: relative; top: auto;
    display: flex; gap: 6px;
    overflow-x: auto; padding: 12px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .side::-webkit-scrollbar { display: none; }
  .side b {
    display: none;
  }
  .side a {
    white-space: nowrap;
    padding: 8px 14px;
    background: var(--panel2);
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: .78rem;
    flex-shrink: 0;
  }

  /* Navigation */
  .navlinks { display: none; }
  .menubtn { display: flex; }

  .navlinks.open {
    display: flex; position: absolute;
    top: calc(100% + 8px);
    left: 12px; right: 12px;
    flex-direction: column; padding: 12px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 20px 60px rgba(0,0,0,.15);
    z-index: 101;
    animation: menuSlideDown .25s var(--ease-out);
  }
  .navlinks.open a {
    padding: 12px 14px;
    font-size: .9rem;
    border-radius: 12px;
  }
  .navlinks.open a:hover, .navlinks.open a.on {
    background: var(--panel2);
  }

  .hero { padding-top: 56px; }

  /* Table scroll hint visible on mobile */
  .tablebox::after { opacity: 1; }
}

@keyframes menuSlideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* --- Responsive: Small Phone (≤480px) ---------------------- */
@media (max-width: 480px) {
  .wrap { width: calc(100% - 24px); }
  h1 { font-size: clamp(2.2rem, 10vw, 3rem); }
  .hero { padding: 40px 0 28px; }
  .hero-card, .card, .callout, .shopcard, .method-card, .checkblock {
    padding: 18px;
  }
  .step { padding: 18px 18px 18px 65px; }
  .step::before { left: 14px; top: 16px; width: 36px; height: 36px; font-size: .85rem; }
  .atompanel { padding: 18px; }
  .atom { width: 220px; height: 220px; }
  .o3 { width: 210px; height: 210px; }
  .flamebox { height: 200px; }
  .flame { width: 80px; height: 150px; }
  .brand span:last-child { font-size: .85rem; }
  .section { padding: 30px 0; }
  footer { padding: 28px 0 48px; }
}

/* --- Print ------------------------------------------------- */
@media print {
  .top, .btnrow, .photontrack, .nav-overlay { display: none !important; }
  body { background: white !important; color: #111 !important; }
  .wrap { width: 100%; }
  .card, .callout, .step, .tablebox, .atompanel,
  .hero-card, .side, .shopcard, .method-card {
    box-shadow: none !important;
    background: white !important;
    border-color: #bbb !important;
  }
  .muted, .lead { color: #333 !important; }
  .section { padding: 18px 0; }
  [data-gsap] { opacity: 1 !important; transform: none !important; }
}