/* ===================================================================
   RAKESH VADNALA — IAM PORTFOLIO
   style.css — global tokens, layout, typography, responsive, utilities
   =================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Palette — "access ledger": deep navy ink, gold verification accent, cyan data accent */
  --ink: #0B1220;
  --ink-alt: #0E1728;
  --surface: #121B30;
  --surface-2: #182541;
  --surface-3: #1E2C4C;
  --border: rgba(232, 236, 244, 0.09);
  --border-strong: rgba(232, 236, 244, 0.16);

  --text: #E8ECF4;
  --text-muted: #8B96AC;
  --text-faint: #5B6884;

  --gold: #E8A33D;
  --gold-dim: rgba(232, 163, 61, 0.14);
  --cyan: #57C6D9;
  --cyan-dim: rgba(87, 198, 217, 0.14);
  --green: #4CD9A0;
  --green-dim: rgba(76, 217, 160, 0.14);

  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --container-w: 1180px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-card: 0 20px 50px -20px rgba(0, 0, 0, 0.5);
  --shadow-soft: 0 10px 30px -12px rgba(0, 0, 0, 0.4);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 0.2s;
  --dur-med: 0.45s;
  --dur-slow: 0.8s;

  color-scheme: dark;
}

[data-theme="light"] {
  --ink: #F3F1EA;
  --ink-alt: #ECE9E0;
  --surface: #FFFFFF;
  --surface-2: #F6F3EC;
  --surface-3: #ECE7DA;
  --border: rgba(20, 22, 30, 0.1);
  --border-strong: rgba(20, 22, 30, 0.18);

  --text: #171A22;
  --text-muted: #565F73;
  --text-faint: #8A93A8;

  --gold: #B9700E;
  --gold-dim: rgba(185, 112, 14, 0.12);
  --cyan: #147B8C;
  --cyan-dim: rgba(20, 123, 140, 0.12);
  --green: #1E9A6E;
  --green-dim: rgba(30, 154, 110, 0.12);

  --shadow-card: 0 20px 50px -24px rgba(20, 22, 30, 0.25);
  --shadow-soft: 0 10px 30px -16px rgba(20, 22, 30, 0.2);

  color-scheme: light;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body, h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
input, textarea, button { font-family: inherit; }

body {
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur-med) var(--ease), color var(--dur-med) var(--ease);
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }

.section-eyebrow, .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
.eyebrow__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--green-dim);
}

.section-title {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  margin-bottom: 14px;
}

.section-lede {
  color: var(--text-muted);
  max-width: 640px;
  font-size: 1.02rem;
  margin-bottom: 40px;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 4px;
}
.field-value {
  display: block;
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}
.field-value--mono { font-family: var(--font-mono); font-size: 0.88rem; }

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: -60px; left: 16px;
  background: var(--gold);
  color: #14100A;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: 999;
  font-weight: 600;
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- Focus visibility ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: var(--gold);
  color: #14100A;
  box-shadow: 0 8px 24px -8px var(--gold-dim);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px -10px rgba(232,163,61,0.45); }
.btn--outline {
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--outline:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-2px); }
.btn--ghost {
  color: var(--text-muted);
  border-color: transparent;
}
.btn--ghost:hover { color: var(--gold); }
.btn--sm { padding: 9px 16px; font-size: 0.82rem; }
.btn--block { width: 100%; }

/* ---------- Icon button ---------- */
.icon-btn {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.icon-btn:hover { color: var(--gold); border-color: var(--gold); transform: rotate(12deg); }
.icon-sun { display: none; }
[data-theme="light"] .icon-sun { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* ---------- Header / nav ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--ink) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.site-header.is-scrolled { border-bottom-color: var(--border); }

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 76px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand__mark {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: var(--gold);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-family: var(--font-display); font-weight: 600; font-size: 0.95rem; }
.brand__role { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-faint); letter-spacing: 0.04em; }

.nav__list { display: flex; gap: 30px; }
.nav__link {
  position: relative;
  font-size: 0.88rem;
  color: var(--text-muted);
  padding: 6px 0;
  transition: color var(--dur-fast) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 0;
  height: 1px;
  background: var(--gold);
  transition: right var(--dur-med) var(--ease);
}
.nav__link:hover, .nav__link.is-active { color: var(--text); }
.nav__link:hover::after, .nav__link.is-active::after { right: 0; }

.nav-actions { display: flex; align-items: center; gap: 14px; }
.nav-cta { display: inline-flex; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 38px; height: 38px;
  align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.hamburger span {
  width: 16px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--dur-fast) var(--ease), opacity var(--dur-fast) var(--ease);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  bottom: -1px; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transition: width 0.1s linear;
}

/* ---------- Mobile menu ---------- */
.mobile-menu {
  position: fixed;
  top: 76px; left: 0; right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transform: translateY(-12px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--dur-med) var(--ease), opacity var(--dur-med) var(--ease);
  z-index: 99;
}
.mobile-menu.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-menu__list { display: flex; flex-direction: column; gap: 4px; }
.mobile-menu__list a {
  display: block;
  padding: 12px 4px;
  font-size: 1.05rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}
.mobile-menu__list a:hover { color: var(--gold); }

/* ---------- Backgrounds ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 30%, transparent 75%);
  opacity: 0.6;
}
.bg-nodes {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 110px;
  padding-bottom: 80px;
}
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero__title {
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  line-height: 1.14;
  margin-bottom: 22px;
}
.type-target { color: var(--gold); }
.type-cursor {
  color: var(--gold);
  animation: blink 1s step-end infinite;
  font-weight: 300;
}
@keyframes blink { 50% { opacity: 0; } }

.hero__lede {
  color: var(--text-muted);
  font-size: 1.08rem;
  max-width: 540px;
  margin-bottom: 32px;
}
.hero__lede strong { color: var(--text); font-weight: 600; }

.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }

.hero__meta { display: flex; gap: 36px; flex-wrap: wrap; }
.meta-item { display: flex; flex-direction: column; }
.meta-item__value {
  font-family: var(--font-display);
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text);
}
.meta-item__label {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.scroll-cue {
  position: absolute;
  bottom: 28px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  animation: floaty 2.4s ease-in-out infinite;
}
@keyframes floaty { 0%, 100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- Sections ---------- */
.section { padding: 120px 0; position: relative; }
.section--alt { background: var(--ink-alt); }

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: start;
}
.about__text { color: var(--text-muted); font-size: 1.04rem; }
.about__text strong { color: var(--text); }

.about__panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.log-line { display: flex; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--border); }
.log-line:last-child { border-bottom: none; }
.log-time { color: var(--cyan); flex-shrink: 0; }
.log-text { color: var(--text-muted); }
.log-line--ok .log-time { color: var(--green); }
.log-line--ok .log-text { color: var(--green); }

/* ---------- Platform cards ---------- */
.platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 40px;
}
.platform-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.platform-card:hover { border-color: var(--border-strong); transform: translateY(-4px); }
.platform-card--accent { border-color: color-mix(in srgb, var(--gold) 30%, var(--border)); }
.platform-card__head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.platform-card__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  background: var(--gold-dim);
  padding: 4px 9px;
  border-radius: 20px;
}
.platform-card h3 { font-size: 1.25rem; }
.platform-card__list li {
  position: relative;
  padding: 9px 0 9px 22px;
  color: var(--text-muted);
  font-size: 0.92rem;
  border-bottom: 1px solid var(--border);
}
.platform-card__list li:last-child { border-bottom: none; }
.platform-card__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 17px;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--cyan-dim);
  border: 1px solid var(--cyan);
}

.onboard-strip {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
}
.onboard-strip__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 14px;
}
.onboard-strip__tags { display: flex; flex-wrap: wrap; gap: 10px; }
.onboard-strip__tags span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
}

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 28px; border-left: 1px solid var(--border); }
.timeline__entry {
  position: relative;
  margin-bottom: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.timeline__summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  flex-wrap: wrap;
}
.timeline__summary::-webkit-details-marker { display: none; }
.timeline__dot {
  position: absolute;
  left: -33px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--surface-3);
  border: 2px solid var(--border-strong);
}
.timeline__dot--active { background: var(--green); border-color: var(--green); box-shadow: 0 0 0 5px var(--green-dim); }
.timeline__time { font-family: var(--font-mono); font-size: 0.78rem; color: var(--cyan); white-space: nowrap; }
.timeline__role { font-weight: 600; font-size: 0.98rem; }
.timeline__org { color: var(--text-muted); font-size: 0.88rem; }
.timeline__chip {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--surface-3);
  color: var(--text-faint);
}
.timeline__chip--active { background: var(--green-dim); color: var(--green); }
.timeline__caret { flex-shrink: 0; color: var(--text-faint); transition: transform var(--dur-fast) var(--ease); }
.timeline__entry[open] .timeline__caret { transform: rotate(180deg); }
.timeline__body { padding: 0 22px 22px 22px; color: var(--text-muted); font-size: 0.92rem; }
.timeline__body p { margin-bottom: 12px; }
.timeline__body ul { padding-left: 18px; list-style: disc; display: flex; flex-direction: column; gap: 6px; }

/* ---------- Filter bar + capability grid ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.filter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  transition: all var(--dur-fast) var(--ease);
}
.filter-btn:hover { border-color: var(--border-strong); color: var(--text); }
.filter-btn.is-active { background: var(--gold); border-color: var(--gold); color: #14100A; font-weight: 600; }

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.cap-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.cap-card:hover { transform: translateY(-5px); border-color: var(--border-strong); box-shadow: var(--shadow-soft); }
.cap-card__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: var(--cyan-dim);
  padding: 4px 9px;
  border-radius: 6px;
  margin-bottom: 14px;
}
.cap-card h3 { font-size: 1.02rem; margin-bottom: 8px; }
.cap-card p { color: var(--text-muted); font-size: 0.88rem; }
.cap-card.is-hidden { display: none; }

/* ---------- Badges / certifications ---------- */
.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}
.cert-badge {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
  text-align: center;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
a.cert-badge { cursor: pointer; }
.cert-badge:hover { transform: translateY(-4px); border-color: var(--gold); box-shadow: var(--shadow-soft); }
.cert-badge__verify {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  opacity: 0;
  transform: translateY(3px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
a.cert-badge:hover .cert-badge__verify,
a.cert-badge:focus-visible .cert-badge__verify {
  opacity: 1;
  transform: translateY(0);
}
.cert-badge__seal {
  width: 46px; height: 46px;
  margin: 0 auto 16px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--gold-dim);
  color: var(--gold);
  font-size: 1.1rem;
  border: 1px dashed var(--gold);
}
.cert-badge h3 { font-size: 0.95rem; margin-bottom: 8px; line-height: 1.3; }
.cert-badge__issuer {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.education-strip {
  display: flex;
  align-items: center;
  gap: 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
}
.education-strip__icon { font-size: 1.6rem; }
.education-strip h3 { font-size: 1rem; margin-bottom: 4px; }

/* ---------- Contact ---------- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
}
.contact-list { margin-top: 30px; display: flex; flex-direction: column; gap: 22px; }
.contact-copy { display: flex; align-items: center; gap: 12px; }
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.72rem;
}
.copy-btn:hover { color: var(--gold); border-color: var(--gold); }
.copy-btn.is-copied { color: var(--green); border-color: var(--green); }
.social-links { display: flex; gap: 16px; margin-top: 2px; }
.social-links a { font-size: 0.9rem; color: var(--text); border-bottom: 1px solid var(--border-strong); }
.social-links a:hover { color: var(--gold); border-color: var(--gold); }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-row { display: flex; flex-direction: column; gap: 7px; }
.form-row label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}
.form-row input, .form-row textarea {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  resize: vertical;
  transition: border-color var(--dur-fast) var(--ease);
}
.form-row input:focus, .form-row textarea:focus { border-color: var(--gold); outline: none; }
.form-row.has-error input, .form-row.has-error textarea { border-color: #E8593D; }
.form-error { font-size: 0.76rem; color: #E8593D; min-height: 14px; }

.btn__loader {
  display: none;
  width: 15px; height: 15px;
  border-radius: 50%;
  border: 2px solid rgba(20,16,10,0.3);
  border-top-color: #14100A;
  animation: spin 0.7s linear infinite;
}
.submitting .btn__loader { display: inline-block; }
.submitting .btn__label { opacity: 0.7; }
@keyframes spin { to { transform: rotate(360deg); } }

.form-status {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  min-height: 18px;
  color: var(--green);
}
.form-status.is-error { color: #E8593D; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-faint);
}
.footer-note { font-family: var(--font-mono); }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(12px) scale(0.9);
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  z-index: 60;
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.back-to-top:hover { border-color: var(--gold); color: var(--gold); }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 16px);
  background: var(--surface-3);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 12px 20px;
  border-radius: 30px;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
  z-index: 200;
  box-shadow: var(--shadow-soft);
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; gap: 60px; }
  .hero__visual { max-width: 420px; margin-inline: auto; }
  .about__grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
  .contact__grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav, .nav-cta { display: none; }
  .hamburger { display: inline-flex; }
}

@media (max-width: 640px) {
  .container { padding-inline: 18px; }
  .section { padding: 84px 0; }
  .hero { padding-top: 100px; }
  .hero__meta { gap: 24px; }
  .capability-grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 22px; }
  .timeline__dot { left: -27px; }
  .timeline__summary { padding: 16px; gap: 10px; }
  .timeline__chip { margin-left: 0; }
  .footer-inner { flex-direction: column; text-align: center; }
}