/* ===== Tokens ===== */
/* Shared, not colors */
:root {
  --shadow: 0 1px 2px rgba(10, 16, 32, 0.06), 0 8px 24px rgba(10, 16, 32, 0.08);
  --shadow-lift: 0 2px 4px rgba(10, 16, 32, 0.08), 0 18px 40px rgba(10, 16, 32, 0.14);
  --radius: 14px;
  --font-head: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Barlow", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* Colors: "Sage & Beige" palette.
   Sage #8FA28A, light sage #C7D3C0, cream #F7F4ED, beige #C8A96B.
   The "-text" versions are darker, so small text stays easy to read. */
:root {
  --accent: #8fa28a;
  --accent-deep: #5f7359;
  --accent-rgb: 143, 162, 138;
  --accent-text: #56704f;
  --on-accent: #18201a;
  --accent-2: #c8a96b;
  --accent-2-text: #8a6a2c;
  --accent-soft: #c7d3c0;
  --bg: #f7f4ed;
  --surface: #ffffff;
  --text: #1c2320;
  --muted: #5c6659;
  --line: #dde2d5;
  --dot: rgba(28, 35, 32, 0.14);
  --glow: rgba(200, 169, 107, 0.4);
  --ok: #4e6349;
  --err: #b23a2e;
  --code-bg: #1f2a22;
  --code-accent: #c8a96b;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --accent: #a9bba4;
    --accent-deep: #6f8469;
    --accent-rgb: 169, 187, 164;
    --accent-text: #a9bba4;
    --on-accent: #141914;
    --accent-2: #d6b97c;
    --accent-2-text: #d6b97c;
    --accent-soft: #3a4838;
    --bg: #141914;
    --surface: #1c231d;
    --text: #f7f4ed;
    --muted: #a3ad9d;
    --line: #2e382e;
    --dot: rgba(247, 244, 237, 0.09);
    --glow: rgba(143, 162, 138, 0.3);
    --ok: #c7d3c0;
    --err: #ff8a7a;
    --code-bg: #0e120e;
    --code-accent: #d6b97c;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --accent: #a9bba4;
  --accent-deep: #6f8469;
  --accent-rgb: 169, 187, 164;
  --accent-text: #a9bba4;
  --on-accent: #141914;
  --accent-2: #d6b97c;
  --accent-2-text: #d6b97c;
  --accent-soft: #3a4838;
  --bg: #141914;
  --surface: #1c231d;
  --text: #f7f4ed;
  --muted: #a3ad9d;
  --line: #2e382e;
  --dot: rgba(247, 244, 237, 0.09);
  --glow: rgba(143, 162, 138, 0.3);
  --ok: #c7d3c0;
  --err: #ff8a7a;
  --code-bg: #0e120e;
  --code-accent: #d6b97c;
  color-scheme: dark;
}

:root[data-theme="dark"] {
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 18px 40px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lift: 0 2px 4px rgba(0, 0, 0, 0.35), 0 18px 40px rgba(0, 0, 0, 0.5);
  }
}

/* ===== Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s, color 0.3s;
}

h1,
h2,
h3 {
  font-family: var(--font-head);
  line-height: 1.05;
  letter-spacing: 0.01em;
}

code,
.mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--accent-text);
  outline-offset: 3px;
  border-radius: 6px;
}

main:focus {
  outline: none;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

/* ===== Living background ===== */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg__dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--dot) 1.2px, transparent 1.2px);
  background-size: 22px 22px;
  mask-image: radial-gradient(ellipse at 70% 0%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at 70% 0%, #000 20%, transparent 75%);
}

.bg__glow {
  position: absolute;
  top: -220px;
  right: -220px;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow), transparent 65%);
  animation: pulse 7s ease-in-out infinite;
  will-change: transform, opacity;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(0.9);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.1);
    opacity: 1;
  }
}

/* ===== Top bar ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  min-width: 0;
}

.brand span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mode-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  white-space: nowrap;
}

.mode-badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
}

.mode-badge[data-mode="server"] .mode-badge__dot {
  background: var(--ok);
}

.mode-badge[data-mode="demo"] .mode-badge__dot {
  background: var(--accent-2);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s;
}

.theme-toggle:hover {
  transform: translateY(-2px) rotate(-12deg);
  box-shadow: var(--shadow);
}

.theme-toggle svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

.icon-moon {
  display: none;
}

:root[data-theme="dark"] .icon-sun {
  display: none;
}

:root[data-theme="dark"] .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun {
    display: none;
  }
  :root:not([data-theme="light"]) .icon-moon {
    display: block;
  }
}

/* ===== Layout ===== */
main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.hero {
  padding: 40px 0 48px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  margin-top: 10px;
  font-size: clamp(3rem, 9vw, 6.5rem);
  font-weight: 800;
  text-transform: uppercase;
}

.accent {
  color: var(--accent-2-text);
}

.hero__lead {
  max-width: 60ch;
  margin-top: 18px;
  color: var(--muted);
  font-size: 1.15rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 36px;
  padding: 0;
  list-style: none;
}

.stats li {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.1;
}

.stats__label {
  font-size: 0.9rem;
  color: var(--muted);
}

/* ===== Cards & forms ===== */
.forms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--accent);
}

.card__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
}

.card__step {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-text);
  font-weight: 600;
}

.card h2 {
  font-size: 2.1rem;
  text-transform: uppercase;
}

.form {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  font-weight: 600;
  font-size: 0.95rem;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input::placeholder {
  color: var(--muted);
  opacity: 0.7;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.25);
}

input[aria-invalid="true"] {
  border-color: var(--err);
}

.field__pw {
  position: relative;
}

.field__pw input {
  padding-right: 76px;
}

.pw-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  padding: 4px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  cursor: pointer;
}

.pw-toggle:hover {
  color: var(--text);
}

.strength {
  height: 4px;
  border-radius: 4px;
  background: var(--line);
  overflow: hidden;
}

.strength__bar {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease), background-color 0.3s;
}

.field__hint {
  font-size: 0.85rem;
  color: var(--muted);
}

.form__msg {
  min-height: 1.6em;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.form__msg[data-type="ok"] {
  color: var(--ok);
}

.form__msg[data-type="error"] {
  color: var(--err);
}

/* ===== Buttons ===== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1.5px solid transparent;
  border-radius: 10px;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.btn--primary {
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: 0 4px 0 var(--accent-deep), 0 8px 20px rgba(var(--accent-rgb), 0.3);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
  box-shadow: var(--shadow);
}

.btn:hover {
  transform: translateY(-3px);
}

.btn--primary:hover {
  box-shadow: 0 7px 0 var(--accent-deep), 0 14px 28px rgba(var(--accent-rgb), 0.4);
}

.btn:active {
  transform: translateY(2px);
}

.btn--primary:active {
  box-shadow: 0 1px 0 var(--accent-deep), 0 4px 10px rgba(var(--accent-rgb), 0.3);
}

.btn[disabled] {
  opacity: 0.6;
  cursor: progress;
}

.btn__icon {
  display: inline-block;
  font-family: var(--font-mono);
  transition: transform 0.25s var(--ease);
}

.btn:hover .btn__icon {
  transform: translate(3px, -3px);
}

.ripple {
  position: absolute;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.3;
  transform: scale(0);
  pointer-events: none;
  animation: ripple 0.6s ease-out forwards;
}

@keyframes ripple {
  to {
    transform: scale(18);
    opacity: 0;
  }
}

/* ===== Welcome card ===== */
.welcome {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 20px;
  padding: 16px;
  border: 1.5px dashed var(--accent-2);
  border-radius: var(--radius);
  animation: pop 0.4s var(--ease);
}

.welcome__avatar {
  border-radius: 50%;
}

.welcome__hi {
  font-size: 0.9rem;
  color: var(--muted);
}

.welcome__name {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
}

.welcome .btn {
  margin-left: auto;
  padding: 8px 14px;
  font-size: 1rem;
}

@keyframes pop {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
}

/* ===== How it works ===== */
.how {
  margin-top: 72px;
}

.how h2 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  text-transform: uppercase;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
  padding: 0;
  list-style: none;
}

.step {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.step__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-text);
  font-weight: 600;
}

.step h3 {
  margin: 6px 0 8px;
  font-size: 1.6rem;
  text-transform: uppercase;
}

.step p {
  color: var(--muted);
}

.code {
  margin-top: 20px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--code-bg);
  color: #e8eefc;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  overflow-x: auto;
}

.code code {
  font-size: inherit;
}

.code .c {
  color: var(--code-accent);
}

.how__links {
  margin-top: 28px;
}

.footer {
  padding: 28px 24px 40px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ===== Reveal on scroll ===== */
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .forms,
  .steps {
    grid-template-columns: 1fr;
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .topbar {
    padding: 16px;
  }

  main {
    padding: 8px 16px 48px;
  }

  .brand span {
    display: none;
  }

  .hero {
    padding: 24px 0 32px;
  }

  .card {
    padding: 22px 18px;
  }

  .btn--primary {
    width: 100%;
  }
}

/* ===== Reduced motion ===== */
@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;
  }

  .bg__glow {
    animation: none;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}