/* ============================================================
   Stringy — a client-side developer string toolkit
   Design language: a refined console. Phosphor accent on ink,
   monospace-forward I/O, hairline structure. Light mode is a
   first-class citizen, not an afterthought.
   ============================================================ */

:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "SF Mono", "Segoe UI Mono", Consolas, monospace;
}

/* ---- Design tokens ---------------------------------------- */
/* Light is the default theme (bare :root); dark is opt-in via [data-theme="dark"]. */
:root[data-theme="dark"] {
  --bg: #0a0f0d;
  --bg-glow: rgba(74, 222, 128, 0.06);
  --surface: #101815;
  --surface-2: #0d1310;
  --field: #0b1210;
  --line: #1e2b25;
  --line-strong: #2b3a33;
  --accent: #4ade80;
  --accent-strong: #22c55e;
  --accent-contrast: #052012;
  --accent-soft: rgba(74, 222, 128, 0.12);
  --accent-glow: rgba(74, 222, 128, 0.22);
  --cyan: #2dd4bf;
  --text: #d7e0da;
  --text-strong: #f1f6f3;
  --muted: #7c8b83;
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.13);
  --shadow: 0 18px 40px -20px rgba(0, 0, 0, 0.7);
  --grid-line: rgba(255, 255, 255, 0.022);
  color-scheme: dark;
}

:root,
:root[data-theme="light"] {
  --bg: #eef3ef;
  --bg-glow: rgba(5, 150, 105, 0.07);
  --surface: #ffffff;
  --surface-2: #f5f9f6;
  --field: #ffffff;
  --line: #dbe6df;
  --line-strong: #c3d3ca;
  --accent: #059669;
  --accent-strong: #047857;
  --accent-contrast: #ffffff;
  --accent-soft: rgba(5, 150, 105, 0.10);
  --accent-glow: rgba(5, 150, 105, 0.18);
  --cyan: #0d9488;
  --text: #1c2a23;
  --text-strong: #0a1611;
  --muted: #5b6b62;
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.08);
  --shadow: 0 18px 38px -24px rgba(15, 40, 30, 0.4);
  --grid-line: rgba(9, 40, 28, 0.03);
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg);
  background-image:
    radial-gradient(120% 80% at 50% -20%, var(--bg-glow), transparent 60%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 100% 100%, 44px 44px, 44px 44px;
  background-attachment: fixed;
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-soft); color: var(--text-strong); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { color: var(--text-strong); margin: 0; }

/* ---- App shell -------------------------------------------- */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.shell {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Header ----------------------------------------------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.masthead__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-strong);
}
.brand:hover { text-decoration: none; }

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(150deg, var(--accent), var(--cyan));
  color: var(--accent-contrast);
  font-weight: 700;
  font-size: 18px;
  box-shadow: 0 0 0 1px var(--line-strong), 0 6px 18px -8px var(--accent-glow);
}

.brand__name { font-size: 1.18rem; color: var(--text-strong); }
.brand__caret {
  color: var(--accent);
  animation: blink 1.15s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.masthead__tools { display: inline-flex; align-items: center; gap: 12px; }

/* No-tracking badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 11px;
  white-space: nowrap;
}
.badge svg { width: 13px; height: 13px; color: var(--accent); }
@media (max-width: 620px) { .badge__text { display: none; } .badge { padding: 6px; } }

/* ---- Theme toggle ----------------------------------------- */
.theme-toggle {
  position: relative;
  width: 58px;
  height: 30px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  cursor: pointer;
  padding: 0;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(150deg, var(--accent), var(--cyan));
  color: var(--accent-contrast);
  display: grid;
  place-items: center;
  transition: transform 0.28s cubic-bezier(0.4, 0.1, 0.2, 1);
  box-shadow: 0 2px 8px -2px var(--accent-glow);
}
:root[data-theme="dark"] .theme-toggle__thumb { transform: translateX(28px); }
.theme-toggle__thumb svg { width: 13px; height: 13px; }

/* ---- Navigation tabs -------------------------------------- */
.tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 14px 0 15px;
  margin: 0;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 7px 13px;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.tab:hover { color: var(--text-strong); background: var(--surface-2); text-decoration: none; }
.tab.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}
.tab__glyph { opacity: 0.75; font-size: 0.9em; }
.tab.active .tab__glyph { opacity: 1; }

/* ---- Main / page ------------------------------------------ */
.main { flex: 1 0 auto; padding: 30px 0 64px; }

.page-head { margin-bottom: 26px; }
.page-head h1 {
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-head h1::before {
  content: "›";
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}
.page-head p { margin: 8px 0 0; color: var(--muted); font-size: 0.92rem; max-width: 60ch; }

.page-enter { animation: rise 0.32s cubic-bezier(0.2, 0.6, 0.2, 1); }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---- Fields ----------------------------------------------- */
.stack { display: flex; flex-direction: column; gap: 20px; }

.field { display: flex; flex-direction: column; gap: 8px; }

.field__label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}
.field__label::before { content: "$ "; color: var(--accent); }
.field__meta { font-size: 0.72rem; text-transform: none; letter-spacing: 0; color: var(--muted); }

textarea,
input[type="text"],
input[type="password"],
select {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-strong);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 11px;
  padding: 13px 14px;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  resize: vertical;
}
textarea { min-height: 118px; line-height: 1.55; }
textarea::placeholder,
input::placeholder { color: var(--muted); opacity: 0.7; }

textarea:focus,
input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

select {
  appearance: none;
  cursor: pointer;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 55%, calc(100% - 13px) 55%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 38px;
}

/* Output field: a result panel with a left accent rail */
.output {
  position: relative;
  border-left: 2px solid var(--accent);
  background: var(--surface-2);
}
.output[readonly] { cursor: text; }

.output-wrap { position: relative; }

/* Read-only display panel (mono result blocks that aren't editable) */
.display {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-strong);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: 11px;
  padding: 13px 14px;
  min-height: 46px;
  word-break: break-all;
  white-space: pre-wrap;
}
.display--empty { color: var(--muted); }

/* ---- Buttons ---------------------------------------------- */
.btn {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  border-radius: 10px;
  padding: 11px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}
.btn--primary:hover { background: var(--accent-strong); }
.btn--block { width: 100%; }

/* Segmented switch (encode/decode, encrypt/decrypt) */
.segmented {
  display: inline-flex;
  padding: 3px;
  gap: 3px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 11px;
}
.segmented__item {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--muted);
  background: transparent;
  border: none;
  border-radius: 8px;
  padding: 8px 20px;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}
.segmented__item:hover { color: var(--text-strong); }
.segmented__item.active {
  color: var(--accent-contrast);
  background: var(--accent);
  font-weight: 600;
}

/* Copy button pinned inside output */
.copy-btn {
  position: absolute;
  top: 9px;
  right: 9px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-strong);
  background: color-mix(in srgb, var(--surface) 80%, transparent);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 5px 9px;
  cursor: pointer;
  backdrop-filter: blur(4px);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  z-index: 2;
}
.copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }
.copy-btn svg { width: 13px; height: 13px; }
.copy-btn--inline { position: static; }

/* ---- Alerts ----------------------------------------------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.86rem;
  border-radius: 11px;
  padding: 12px 14px;
}
.alert--error {
  color: var(--danger);
  background: var(--danger-soft);
  border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
}
.alert svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 1px; }

/* ---- Two-column grid -------------------------------------- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .grid-2 { grid-template-columns: 1fr; } }

/* Swatch preview */
.swatch {
  height: 76px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background-image:
    linear-gradient(45deg, var(--line) 25%, transparent 25%),
    linear-gradient(-45deg, var(--line) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--line) 75%),
    linear-gradient(-45deg, transparent 75%, var(--line) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  position: relative;
  overflow: hidden;
}
.swatch__fill { position: absolute; inset: 0; }

/* ---- Color wheel ------------------------------------------ */
.wheel-pop {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  padding: 18px;
  box-shadow: var(--shadow);
}
.wheel {
  position: relative;
  width: 240px;
  height: 240px;
  margin: 0 auto;
  border-radius: 50%;
  cursor: crosshair;
  touch-action: none;
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(circle, #fff 0%, rgba(255, 255, 255, 0) 70%),
    conic-gradient(
      hsl(0 100% 50%), hsl(60 100% 50%), hsl(120 100% 50%),
      hsl(180 100% 50%), hsl(240 100% 50%), hsl(300 100% 50%), hsl(360 100% 50%)
    );
}
.wheel__cursor {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px #000, 0 1px 4px rgba(0, 0, 0, 0.5);
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.wheel-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.wheel-selected {
  margin-top: 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
}
.wheel-selected b { color: var(--text-strong); }
.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---- Icon button (color picker trigger) ------------------- */
.field-row { display: flex; gap: 8px; align-items: stretch; }
.field-row > input { flex: 1; }
.icon-btn {
  flex: 0 0 auto;
  width: 48px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--text-strong);
  font-size: 1.15rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.icon-btn:hover { border-color: var(--accent); }
.icon-btn.active { border-color: var(--accent); background: var(--accent-soft); }

/* ---- Chips (quick patterns / presets) --------------------- */
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 11px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.chip:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

/* ---- Helper / cheatsheet block ---------------------------- */
.helper-block {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  padding: 16px 18px;
}
.helper-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.helper-title::before { content: "# "; color: var(--accent); }

.cheatsheet {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 8px 18px;
}
.cheat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.83rem;
  color: var(--muted);
}
.cheat code {
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 1px 6px;
  white-space: nowrap;
  flex: 0 0 auto;
  min-width: 46px;
  text-align: center;
}

code {
  font-family: var(--font-mono);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 0.9em;
}

/* ---- Cron field legend ------------------------------------ */
.cron-legend {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  text-align: center;
}
.cron-legend div {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 7px 4px;
  line-height: 1.5;
}
.cron-legend b { display: block; color: var(--text-strong); font-size: 0.82rem; }

.cron-readout {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-strong);
}
.cron-readout .muted { color: var(--muted); font-size: 0.86rem; }

/* ---- Footer ----------------------------------------------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 30px;
  color: var(--muted);
  font-size: 0.8rem;
}
.footer__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.footer__tags { display: inline-flex; gap: 8px; flex-wrap: wrap; font-family: var(--font-mono); }
.footer__tag { color: var(--muted); }
.footer__tag::before { content: "• "; color: var(--accent); }

/* ---- Focus & motion --------------------------------------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button:focus-visible, .tab:focus-visible { outline-offset: 2px; }
/* Headings are focused programmatically for screen readers on navigation — no visible ring. */
h1:focus, h1:focus-visible { outline: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---- Blazor loading + error ------------------------------- */
.loading-progress {
  position: fixed;
  display: block;
  width: 8rem;
  height: 8rem;
  top: calc(50% - 4rem);
  left: calc(50% - 4rem);
}
.loading-progress circle {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 0.5rem;
  transform-origin: 50% 50%;
  transform: rotate(-90deg);
}
.loading-progress circle:last-child {
  stroke: var(--accent);
  stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.4), 500%;
  transition: stroke-dasharray 0.05s ease-in-out;
}
.loading-progress-text {
  position: absolute;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 600;
  inset: calc(50% + 4.2rem) 0 auto 0;
  color: var(--muted);
}
.loading-progress-text::after { content: var(--blazor-load-percentage-text, "Loading"); }

#blazor-error-ui {
  color: #fff;
  background: #b91c1c;
  bottom: 0;
  box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
  display: none;
  left: 0;
  padding: 0.9rem 1.2rem;
  position: fixed;
  width: 100%;
  z-index: 1000;
  font-family: var(--font-sans);
}
#blazor-error-ui .dismiss {
  cursor: pointer;
  position: absolute;
  right: 1rem;
  top: 0.75rem;
}