/* plc-app shared UI — vanilla CSS, no frameworks */

:root {
  --color-bg: #0c0f14;
  --color-bg-elevated: #121722;
  --color-surface: #161d2a;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-text: #e8ecf4;
  --color-text-muted: #8b95a8;
  --color-accent: #4d9fff;
  --color-accent-hover: #6eb0ff;
  --color-danger: #f87171;
  --color-success: #4ade80;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.45);
  --space-xs: 0.35rem;
  --space-sm: 0.65rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: clamp(1.5rem, 4vw, 3rem);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  --touch-min: 48px;
  --content-max: min(100%, clamp(22rem, 92vw, 72rem));
  --content-max-wide: min(100%, clamp(22rem, 94vw, 96rem));
  --transition-fast: 0.15s ease;
  --transition-med: 0.22s ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f0f3f9;
    --color-bg-elevated: #ffffff;
    --color-surface: #ffffff;
    --color-border: rgba(15, 20, 30, 0.1);
    --color-text: #141824;
    --color-text-muted: #5c6578;
    --color-accent: #1a6fd4;
    --color-accent-hover: #0d5bb8;
    --shadow-card: 0 4px 20px rgba(20, 24, 36, 0.08);
    --shadow-card-hover: 0 10px 36px rgba(20, 24, 36, 0.12);
  }
}

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

html {
  font-family: var(--font-sans);
  font-size: clamp(15px, 0.35vw + 14px, 19px);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  /* Prevent pull-to-refresh in mobile/PWA (Windows/Android browsers). */
  overscroll-behavior-y: none;
}

body.app-body {
  margin: 0;
  min-height: 100vh;
  color: var(--color-text);
  background: radial-gradient(120% 80% at 50% -20%, rgba(77, 159, 255, 0.12), transparent),
    linear-gradient(165deg, var(--color-bg) 0%, #080a0e 100%);
  animation: appFadeIn 0.35s ease;
  overscroll-behavior-y: none;
}

@media (prefers-color-scheme: light) {
  body.app-body {
    background: linear-gradient(165deg, #e8edf5 0%, var(--color-bg) 100%);
  }
}

@keyframes appFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-2xl) var(--space-md);
  padding-bottom: calc(var(--space-2xl) + env(safe-area-inset-bottom, 0px));
}

.app-shell--center {
  justify-content: center;
  align-items: center;
}

.app-container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

.app-container--wide {
  max-width: var(--content-max-wide);
}

.app-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  animation: appSlideDown 0.4s ease;
}

.app-topbar__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
  padding: 0.12rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.lang-switch__btn {
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.35rem 0.55rem;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text-muted);
}

.lang-switch__btn:hover {
  color: var(--color-text);
}

.lang-switch__btn--active {
  color: var(--color-text);
  border-color: rgba(77, 159, 255, 0.35);
  background: rgba(77, 159, 255, 0.12);
}

.auth-card__toolbar,
.landing-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--space-md);
}

@keyframes appSlideDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.app-brand {
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
}

.app-brand--sub {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: 0.9em;
}

.app-main {
  flex: 1;
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-md), 3vw, var(--space-xl));
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-med), transform var(--transition-fast),
    border-color var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(77, 159, 255, 0.25);
}

.card__title {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  font-weight: 650;
}

.card__subtitle {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

/* Typography */
h1.app-page-title {
  margin: 0 0 var(--space-sm);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.lead {
  margin: 0 0 var(--space-lg);
  color: var(--color-text-muted);
  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  max-width: 42rem;
}

.muted {
  color: var(--color-text-muted);
  font-size: 0.88rem;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: var(--touch-min);
  padding: 0.55rem 1.15rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  line-height: 1.2;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), transform 0.1s ease, box-shadow var(--transition-fast);
  touch-action: manipulation;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 12px rgba(77, 159, 255, 0.35);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 18px rgba(77, 159, 255, 0.45);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--danger {
  background: rgba(248, 113, 113, 0.15);
  color: var(--color-danger);
  border-color: rgba(248, 113, 113, 0.35);
}

.btn--danger:hover {
  background: rgba(248, 113, 113, 0.25);
}

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

.btn--compact {
  min-height: 42px;
  padding: 0.4rem 0.9rem;
  font-size: 0.92rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

/* Forms */
.form-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: flex-end;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  flex: 1 1 12rem;
  min-width: 0;
}

.form-field label,
label.form-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.input,
select.input,
input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"] {
  min-height: var(--touch-min);
  padding: 0.55rem 0.85rem;
  font-size: 16px;
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  width: 100%;
  max-width: 100%;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input:focus,
select.input:focus,
input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(77, 159, 255, 0.2);
}

input[type="file"].input-file {
  min-height: var(--touch-min);
  padding: var(--space-sm);
  width: 100%;
  max-width: 28rem;
}

/* Nav grid */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 16rem), 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.nav-tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
  padding: var(--space-lg);
  min-height: 5.5rem;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-med),
    border-color var(--transition-fast);
}

.nav-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(77, 159, 255, 0.35);
  text-decoration: none;
  color: var(--color-accent);
}

.nav-tile small {
  font-weight: 500;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Auth pages */
.auth-card {
  position: relative;
  width: 100%;
  max-width: min(100%, 26rem);
  padding: clamp(var(--space-lg), 5vw, var(--space-xl));
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  animation: cardPop 0.4s ease;
}

@keyframes cardPop {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.auth-card .app-page-title {
  margin-bottom: var(--space-sm);
}

/* Tables */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-top: var(--space-md);
}

.data-table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.data-table th,
.data-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background: var(--color-bg-elevated);
  font-weight: 650;
  color: var(--color-text-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: rgba(77, 159, 255, 0.06);
}

.data-table code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  word-break: break-all;
}

/* PLC checkboxes */
.chk-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.chk-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  white-space: nowrap;
  font-size: 0.9rem;
}

.chk-item input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--color-accent);
}

/* Lists */
.list-plain {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
}

.list-plain li {
  margin-bottom: var(--space-xs);
}

/* Code / pre output */
.pre-out {
  margin: var(--space-md) 0 0;
  padding: var(--space-md);
  min-height: 10rem;
  max-height: min(70vh, 48rem);
  overflow: auto;
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 1.5vw, 0.9rem);
  line-height: 1.45;
  color: #e6eaf2;
  background: #0a0e14;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  white-space: pre-wrap;
  word-break: break-word;
}

@media (prefers-color-scheme: light) {
  .pre-out {
    color: #1a2332;
    background: #f4f6fa;
    border-color: rgba(15, 20, 30, 0.12);
  }
}

/* Admin tools — Modbus audit narrative */
.audit-narrative__h {
  margin-top: 1.25rem;
  font-size: 1.05rem;
}
.audit-narrative__h:first-child {
  margin-top: 0;
}
.audit-narrative__essay {
  margin: 0.4rem 0 0;
  line-height: 1.5;
}
.audit-narrative__bilingual {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.35rem;
}
@media (min-width: 768px) {
  .audit-narrative__bilingual {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}
.audit-narrative__bilingual--tight {
  gap: 0.5rem;
  margin-top: 0;
}
.audit-narrative__column .audit-narrative__langtag {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0.65;
  margin-bottom: 0.15rem;
}
.audit-narrative__per-tpl {
  margin-top: 0.5rem;
  padding-top: 0.35rem;
  border-top: 1px solid rgba(148, 163, 184, 0.22);
}
.audit-narrative__per-tpl:first-of-type {
  border-top: none;
  padding-top: 0;
}
.audit-narrative__inner--sr .audit-narrative__lead {
  line-height: 1.5;
  margin-bottom: 0.65rem;
}
.audit-narrative__tpl-list {
  margin: 0.35rem 0 0;
  padding-left: 1.15rem;
  line-height: 1.45;
}
.audit-narrative__subh {
  font-size: 0.98rem;
  font-weight: 650;
  margin: 1rem 0 0.35rem;
  color: var(--color-text);
}
.audit-narrative__warn {
  margin: 0.35rem 0 0;
  padding-left: 0;
  list-style: none;
}
.audit-narrative__warn li {
  margin-bottom: 0.4rem;
  padding-left: 0.55rem;
  border-left: 3px solid rgba(148, 163, 184, 0.45);
}
.audit-narrative__warn li[data-sev='review'] {
  border-left-color: rgba(250, 204, 21, 0.85);
}
.audit-narrative__warn li[data-sev='info'] {
  border-left-color: rgba(96, 165, 250, 0.75);
}

/* Utilities */
.mt-0 {
  margin-top: 0;
}
.mt-md {
  margin-top: var(--space-md);
}
.mt-lg {
  margin-top: var(--space-lg);
}
.mb-0 {
  margin-bottom: 0;
}
.stack-gap-lg > * + * {
  margin-top: var(--space-lg);
}

@media (min-width: 1200px) {
  .nav-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1920px) {
  html {
    font-size: clamp(16px, 0.5vw + 14px, 22px);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}