/* PassForge - cool slate / copper palette */

:root {
  --ink: #e8eef4;
  --ink-soft: #a4b0bc;
  --muted: #7a8794;
  --paper: #121820;
  --panel: #1a222c;
  --panel-2: #232c38;
  --steel: #3d4a58;
  --line: rgba(232, 238, 244, 0.12);
  --ember: #3ec4d4;
  --ember-deep: #6dd9e6;
  --teal: #3d9b8f;
  --ok: #5cbc7a;
  --font-brand: "Syne", sans-serif;
  --font-body: "Work Sans", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

main {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background: #0c1218;
}

.atmosphere::before {
  content: "";
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(ellipse 42% 36% at 18% 22%, rgba(62, 196, 212, 0.28), transparent 58%),
    radial-gradient(ellipse 38% 34% at 82% 18%, rgba(56, 120, 160, 0.26), transparent 55%),
    radial-gradient(ellipse 48% 40% at 55% 78%, rgba(45, 90, 130, 0.22), transparent 60%),
    radial-gradient(ellipse 30% 28% at 70% 55%, rgba(61, 155, 143, 0.14), transparent 50%),
    linear-gradient(155deg, #0e141c 0%, #121a24 45%, #152028 100%);
  background-size: 140% 140%;
  animation: aurora-drift 22s var(--ease) infinite alternate;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.28;
  background-image:
    radial-gradient(rgba(232, 238, 244, 0.09) 0.7px, transparent 0.8px),
    linear-gradient(rgba(232, 238, 244, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 238, 244, 0.035) 1px, transparent 1px),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:
    18px 18px,
    48px 48px,
    48px 48px,
    180px 180px;
  mix-blend-mode: soft-light;
  pointer-events: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Hero */

.hero {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
  min-height: calc(100vh - 5rem);
  text-align: center;
  box-sizing: border-box;
}

.hero-copy {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  animation: rise 0.8s var(--ease) 0.08s both;
}

.brand {
  margin: 0 0 0.85rem;
  width: 100%;
  font-family: var(--font-brand);
  font-weight: 800;
  font-size: clamp(2.8rem, 10vw, 4rem);
  line-height: 0.92;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-align: center;
}

.tagline {
  margin: 0 auto;
  max-width: 34ch;
  font-size: 1.1rem;
  color: var(--ink-soft);
  text-align: center;
}

/* Forge panel - interaction container */

.forge {
  position: relative;
  z-index: 0;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 1.5rem;
  text-align: left;
  background: rgba(26, 34, 44, 0.9);
  border: 1px solid var(--line);
  border-radius: 4px;
  backdrop-filter: blur(10px);
  animation: rise 0.85s var(--ease) 0.16s both;
  box-shadow:
    0 18px 70px 8px rgba(62, 196, 212, 0.09),
    0 28px 120px 28px rgba(62, 196, 212, 0.06),
    0 24px 48px -20px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(232, 238, 244, 0.06);
}

.forge::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -28% -22% -36% -22%;
  background:
    radial-gradient(ellipse 85% 70% at 50% 62%, rgba(62, 196, 212, 0.22), transparent 74%),
    radial-gradient(ellipse 65% 55% at 35% 78%, rgba(56, 120, 160, 0.12), transparent 76%);
  filter: blur(52px);
  opacity: 0.5;
  pointer-events: none;
  animation: glow-breathe 7s ease-in-out infinite alternate;
}

.output-row {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
  margin-bottom: 0.35rem;
}

.password-out {
  flex: 1;
  display: flex;
  align-items: center;
  min-height: 3.4rem;
  padding: 0.85rem 1rem;
  font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  font-size: clamp(0.95rem, 2.2vw, 1.15rem);
  letter-spacing: 0.04em;
  word-break: break-all;
  color: var(--ink);
  background: #0e141c;
  border: 1.5px solid rgba(232, 238, 244, 0.28);
  border-radius: 2px;
}

.password-out.is-placeholder {
  color: var(--muted);
  letter-spacing: 0;
  font-family: var(--font-body);
  font-size: 1rem;
}

.btn-icon {
  flex-shrink: 0;
  width: 3.4rem;
  display: grid;
  place-items: center;
  color: var(--ink);
  background: transparent;
  border: 1.5px solid rgba(232, 238, 244, 0.28);
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn-icon:hover:not(:disabled) {
  background: var(--ember);
  border-color: var(--ember);
  color: #0e141c;
}

.btn-icon:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.copy-feedback {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--ok);
  font-weight: 500;
}

.length-block {
  display: block;
  margin: 1.35rem 0 1.25rem;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.55rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.length-value {
  width: 2.6ch;
  margin: 0;
  padding: 0.15rem 0.35rem;
  font-family: var(--font-brand);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ember);
  letter-spacing: -0.03em;
  text-align: right;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  outline: none;
  cursor: text;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
  -moz-appearance: textfield;
  appearance: textfield;
}

.length-value::-webkit-outer-spin-button,
.length-value::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.length-value:hover,
.length-value:focus {
  width: 3.4ch;
  background: rgba(14, 20, 28, 0.55);
  border-color: rgba(62, 196, 212, 0.45);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--steel);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ember);
  border: 2px solid #1a222c;
  box-shadow: 0 0 10px rgba(62, 196, 212, 0.45);
  cursor: pointer;
  transition: transform 0.15s var(--ease);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.12);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ember);
  border: 2px solid #1a222c;
  box-shadow: 0 0 10px rgba(62, 196, 212, 0.45);
  cursor: pointer;
}

.options {
  margin: 0 0 1rem;
  padding: 0;
  border: none;
  display: grid;
  gap: 0.55rem;
}

.check {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(14, 20, 28, 0.55);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.check:hover {
  border-color: rgba(232, 238, 244, 0.28);
}

.check:has(input:checked) {
  border-color: var(--teal);
  background: rgba(61, 155, 143, 0.12);
}

.check input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--teal);
  cursor: pointer;
}

.check span:first-of-type {
  font-weight: 550;
}

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: ui-monospace, monospace;
}

.error {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  color: var(--ember-deep);
  font-weight: 500;
}

.actions {
  margin-top: 0.25rem;
}

.btn-primary {
  width: 100%;
  padding: 0.95rem 1.25rem;
  font-family: var(--font-brand);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #0e141c;
  background: var(--ember);
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.25s var(--ease), transform 0.2s var(--ease), box-shadow 0.25s var(--ease);
}

.btn-primary:hover {
  background: var(--ember-deep);
  box-shadow: 0 0 24px rgba(62, 196, 212, 0.35);
}

.btn-primary:active {
  transform: scale(0.985);
}

.strength {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
}

.strength-label {
  color: var(--muted);
}

.strength-bar {
  display: flex;
  gap: 4px;
  height: 6px;
}

.strength-bar span {
  flex: 1;
  background: var(--steel);
  border-radius: 1px;
  transition: background 0.3s var(--ease);
}

.strength-bar[data-level="1"] span:nth-child(1) {
  background: #c0392b;
}

.strength-bar[data-level="2"] span:nth-child(-n+2) {
  background: #d4880f;
}

.strength-bar[data-level="3"] span {
  background: var(--ok);
}

.strength-text {
  font-weight: 600;
  min-width: 4.5rem;
  text-align: right;
  color: var(--ink);
}

/* Advantages */

.advantages {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 1rem 1.5rem 5rem;
  text-align: center;
  box-sizing: border-box;
}

.advantages h2 {
  margin: 0 auto 0.5rem;
  font-family: var(--font-brand);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  text-align: center;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.section-lead {
  margin: 0 auto 2.25rem;
  max-width: 40ch;
  color: var(--ink-soft);
  text-align: center;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease) 0.08s, transform 0.7s var(--ease) 0.08s;
}

.adv-list {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 2rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
  text-align: center;
  justify-items: center;
}

.adv-list li {
  padding: 0;
  width: 100%;
  text-align: center;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

.adv-list li:nth-child(1) { transition-delay: 0.12s; }
.adv-list li:nth-child(2) { transition-delay: 0.2s; }
.adv-list li:nth-child(3) { transition-delay: 0.28s; }
.adv-list li:nth-child(4) { transition-delay: 0.36s; }
.adv-list li:nth-child(5) { transition-delay: 0.44s; }
.adv-list li:nth-child(6) { transition-delay: 0.52s; }

.advantages.is-visible h2,
.advantages.is-visible .section-lead,
.advantages.is-visible .adv-list li {
  opacity: 1;
  transform: translateY(0);
}

.adv-list h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-brand);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.adv-list p {
  margin: 0 auto;
  max-width: 28ch;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

@keyframes aurora-drift {
  0% {
    transform: translate3d(-4%, -2%, 0) scale(1);
  }
  50% {
    transform: translate3d(3%, 3%, 0) scale(1.05);
  }
  100% {
    transform: translate3d(5%, -3%, 0) scale(1.02);
  }
}

@keyframes glow-breathe {
  from {
    opacity: 0.38;
    transform: translateY(6%) scale(0.98);
  }
  to {
    opacity: 0.55;
    transform: translateY(8%) scale(1.03);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes flash {
  0%, 100% { opacity: 1; }
  40% { opacity: 0.55; }
}

.password-out.is-scrambling {
  color: var(--ember);
}

.password-out.just-forged {
  animation: flash 0.45s var(--ease);
}

@media (max-width: 860px) {
  .hero {
    min-height: auto;
    padding-top: 1.5rem;
  }

  .adv-list {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .advantages h2,
  .advantages .section-lead,
  .advantages .adv-list li {
    opacity: 1 !important;
    transform: none !important;
  }
}