:root {
  /* Theme tokens */
  --bg: #06110c;
  --bg-deep: #030806;
  --bg-glow: #0d2419;
  --panel-bg: rgba(7, 24, 17, 0.88);
  --panel-bg-strong: rgba(4, 14, 10, 0.97);
  --panel-border: rgba(110, 255, 175, 0.28);
  --panel-border-soft: rgba(142, 255, 179, 0.24);
  --panel-border-faint: rgba(142, 255, 179, 0.18);
  --panel-highlight: rgba(255, 255, 255, 0.03);
  --surface-dark: rgba(2, 8, 5, 0.92);
  --surface-accent: rgba(142, 255, 179, 0.06);
  --surface-code: rgba(142, 255, 179, 0.07);
  --text: #d7ffe4;
  --text-soft: #c7f3d4;
  --text-muted: #8ab39b;
  --text-placeholder: #5f826d;
  --accent: #8effb3;
  --accent-strong: #c8ffd8;
  --neutral: #95a19c;
  --neutral-strong: #d6ddd9;
  --neutral-border: rgba(149, 161, 156, 0.42);
  --neutral-shadow: 0 0 18px rgba(149, 161, 156, 0.14);
  --alert: #ff8c69;
  --alert-strong: #ffd4c8;
  --alert-bg: rgba(255, 140, 105, 0.08);
  --alert-border: rgba(255, 140, 105, 0.34);
  --alert-shadow: 0 0 20px rgba(255, 140, 105, 0.12);
  --shadow: 0 0 24px rgba(81, 255, 140, 0.12);
  --shadow-soft: 0 0 18px rgba(142, 255, 179, 0.12);
  --shadow-strong: 0 0 18px rgba(142, 255, 179, 0.14);
  --text-glow: 0 0 18px rgba(142, 255, 179, 0.22);
  --focus-ring: 0 0 0 3px rgba(142, 255, 179, 0.08);
  --font-mono:
    "IBM Plex Mono", "SFMono-Regular", "Menlo", "Consolas", monospace;
  --transition-fast: 120ms ease;
}

/* Base */
* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(58, 173, 101, 0.15), transparent 36%),
    linear-gradient(180deg, #07140e 0%, var(--bg-deep) 100%);
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px;
  overflow-x: hidden;
  position: relative;
  color: var(--text);
  font-family: var(--font-mono);
  background: repeating-linear-gradient(
    to bottom,
    rgba(142, 255, 179, 0.11) 0,
    rgba(142, 255, 179, 0.11) 1px,
    transparent 1px,
    transparent 4px
  );
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
}

body::before {
  background:
    linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.18),
      transparent 18%,
      transparent 82%,
      rgba(0, 0, 0, 0.18)
    ),
    radial-gradient(circle at center, transparent 58%, rgba(0, 0, 0, 0.38) 100%);
  mix-blend-mode: multiply;
}

body::after {
  opacity: 0.1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.12) 50%, transparent 50%),
    linear-gradient(
      90deg,
      rgba(255, 0, 0, 0.05),
      rgba(0, 255, 0, 0.035),
      rgba(0, 70, 255, 0.05)
    );
  background-size:
    100% 4px,
    6px 100%;
}

p {
  margin: 0;
  line-height: 1.6;
}

label {
  display: inline-block;
}

input[type="text"],
button {
  font: inherit;
}

a {
  color: inherit;
}

input[type="text"] {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(142, 255, 179, 0.25);
  background: var(--surface-dark);
  color: var(--text);
  outline: none;
  box-shadow: inset 0 0 14px rgba(70, 194, 112, 0.08);
}

input[type="text"]::placeholder {
  color: var(--text-placeholder);
}

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow:
    var(--focus-ring),
    inset 0 0 14px rgba(70, 194, 112, 0.08);
}

button {
  padding: 14px 18px;
  border: 1px solid rgba(142, 255, 179, 0.4);
  background: linear-gradient(
    180deg,
    rgba(142, 255, 179, 0.18),
    rgba(142, 255, 179, 0.08)
  );
  color: var(--accent-strong);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast);
}

button:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: var(--shadow-strong);
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 18px;
  border: 1px solid rgba(142, 255, 179, 0.4);
  background: linear-gradient(
    180deg,
    rgba(142, 255, 179, 0.18),
    rgba(142, 255, 179, 0.08)
  );
  color: var(--accent-strong);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.button-link:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: var(--shadow-strong);
}

.button-link--neutral {
  border-color: var(--neutral-border);
  background: linear-gradient(
    180deg,
    rgba(149, 161, 156, 0.18),
    rgba(149, 161, 156, 0.08)
  );
  color: var(--neutral-strong);
}

.button-link--neutral:hover {
  border-color: var(--neutral);
  box-shadow: var(--neutral-shadow);
}

/* Layout */
#container {
  width: min(720px, 100%);
  padding: 28px;
  position: relative;
  backdrop-filter: blur(6px);
}

#container::before {
  content: "SECURE TERMINAL v1013.115";
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
}

form {
  margin-top: 24px;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
}

.button-row {
  display: flex;
  gap: 12px;
}

/* Reusable classes */
.panel {
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  box-shadow:
    var(--shadow),
    inset 0 0 0 1px var(--panel-highlight);
}

.panel--floating {
  border-color: var(--panel-border-soft);
  background: var(--panel-bg-strong);
}

.panel--accent {
  border-left: 3px solid var(--accent);
  background: var(--surface-accent);
}

.panel--alert {
  border-color: var(--alert-border);
  border-left: 3px solid var(--alert);
  background: var(--alert-bg);
  box-shadow:
    var(--alert-shadow),
    inset 0 0 0 1px var(--panel-highlight);
}

.stack-sm > * + * {
  margin-top: 10px;
}

.stack-md > * + * {
  margin-top: 14px;
}

.eyebrow,
.field-label,
.section-label {
  color: var(--text-muted);
  text-transform: uppercase;
}

.eyebrow {
  letter-spacing: 0.08em;
  font-size: 0.8rem;
}

.field-label {
  letter-spacing: 0.12em;
  font-size: 0.82rem;
}

.section-label {
  letter-spacing: 0.14em;
  font-size: 0.78rem;
}

.text-body {
  color: var(--text);
  line-height: 1.55;
  letter-spacing: 0.01em;
}

.page-title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 0.95;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  text-shadow: var(--text-glow);
}

/* Section-specific rules */
#header {
  margin-top: 10px;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--panel-border-faint);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 8px 16px;
}

#header .eyebrow {
  margin-top: 8px;
}

.help-row {
  position: absolute;
  top: 0;
  right: 0;
  transform: translate(50%, -50%);
  z-index: 3;
}

.help-indicator {
  --help-bubble-size: 1.9rem;
  --help-arrow-size: 12px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--help-bubble-size);
  height: var(--help-bubble-size);
  border: 1px solid var(--panel-border);
  border-radius: 50%;
  background: #07140e;
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  cursor: help;
}

.help-indicator:hover,
.help-indicator:focus-visible {
  border-color: var(--accent);
  box-shadow: var(--shadow-soft);
}

.help-tooltip {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: min(320px, calc(100vw - 56px));
  padding: 14px 16px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
  z-index: 2;
}

.help-tooltip::before {
  content: "";
  position: absolute;
  top: -7px;
  right: calc((var(--help-bubble-size) / 2) - (var(--help-arrow-size) / 2));
  width: var(--help-arrow-size);
  height: var(--help-arrow-size);
  border-top: 1px solid var(--panel-border-soft);
  border-left: 1px solid var(--panel-border-soft);
  background: var(--panel-bg-strong);
  transform: rotate(45deg);
}

.help-indicator:hover .help-tooltip,
.help-indicator:focus-visible .help-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.result {
  margin-top: 24px;
  padding: 18px;
}

.result--error {
  position: relative;
  overflow: hidden;
}

.result--error::before {
  content: "ALERT";
  position: absolute;
  top: 14px;
  right: 16px;
  color: rgba(255, 140, 105, 0.72);
  letter-spacing: 0.18em;
  font-size: 0.72rem;
}

#codename {
  display: inline-block;
  font-size: clamp(1.6rem, 5vw, 2.7rem);
  line-height: 1.1;
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-shadow: 0 0 16px rgba(142, 255, 179, 0.22);
}

.alert-title {
  color: var(--alert-strong);
  font-size: 1.3rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-shadow: 0 0 14px rgba(255, 140, 105, 0.18);
}

.alert-hint {
  color: var(--alert-strong);
  padding-top: 10px;
  border-top: 1px solid rgba(255, 140, 105, 0.18);
}

.status-line {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid rgba(142, 255, 179, 0.15);
}

.status-ellipsis {
  display: inline-block;
  width: 3ch;
}

.status-ellipsis::before {
  content: "";
  display: inline-block;
  animation: status-ellipsis 1.4s step-end infinite;
}

@keyframes status-ellipsis {
  0%,
  24% {
    content: "";
  }

  25%,
  49% {
    content: ".";
  }

  50%,
  74% {
    content: "..";
  }

  75%,
  100% {
    content: "...";
  }
}

@media (prefers-reduced-motion: reduce) {
  .status-ellipsis::before {
    animation: none;
  }
}

/* Responsive */
@media (max-width: 640px) {
  #container {
    padding: 22px 18px;
  }

  #container::before {
    position: static;
    display: block;
    margin-bottom: 14px;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  button,
  .button-link {
    width: 100%;
  }
}