/* Theme variables */
:root {
  --bg: #0f1117;
  --text: #e6e6e6;
  --muted: #aab4bf;

  --surface: #161b22;
  --surface-2: #1f2933;

  --border: #2d333b;
  --border-strong: #58a6ff;

  --link: #58a6ff;

  --btn-bg: #161b22;
  --btn-border: #30363d;

  --primary: #238636;
  --primary-hover: #2ea043;

  --danger: #b91c1c;
  --danger-hover: #dc2626;
}

[data-theme="light"] {
  --bg: #f7f7f8;
  --text: #111;
  --muted: #444;

  --surface: #ffffff;
  --surface-2: #f1f3f5;

  --border: #e5e7eb;
  --border-strong: #2563eb;

  --link: #2563eb;

  --btn-bg: #ffffff;
  --btn-border: #d1d5db;

  --primary: #16a34a;
  --primary-hover: #15803d;

  --danger: #b91c1c;
  --danger-hover: #dc2626;
}

html[data-theme="light"] input,
html[data-theme="light"] textarea{
  background: rgba(20,26,36,0.03);
}

/* Base */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}

.container { width: min(920px, 92%); margin: 0 auto; }

a { color: var(--link); text-decoration: none; }
a:hover { opacity: 0.9; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.header-controls{
  justify-self: end;
  display: flex;
  gap: 10px;
  align-items: center;
}

.lang-toggle{
  width: auto !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--hud-line);
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);

  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  line-height: 1;
}

:root[data-theme="light"] .lang-toggle{
  background: rgba(0,0,0,0.03);
  border-color: rgba(15,23,42,0.18);
  color: #0f172a;
}
#langToggle{
  width: auto !important;
  display: inline-flex !important;
}

.lang-toggle:hover{
  border-color: rgba(255,255,255,0.35);
  box-shadow: 0 10px 24px rgba(0,0,0,0.18);
}
.brand { justify-self: start; font-weight: 800; }
.title { justify-self: center; margin: 0; font-size: 1.1rem; opacity: 0.95; }

.theme-toggle {
  justify-self: end;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  transition: all 0.25s ease;
}
.theme-toggle:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(88, 166, 255, 0.25);
}
.theme-toggle:active { transform: scale(0.95); }

/* Panel */
.panel {
  margin: 28px 0 60px;
  padding: 18px;
  border-radius: var(--r-2);
  border:1px solid var(--hud-line);
  background:var(--bg-panel);
}

/* Form */
.todo-form {
  display: flex;
  gap: 10px;
}
.todo-form input {
  flex: 1;
  padding: 12px 12px;
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  border: 1px solid var(--hud-line);
  border-radius: var(--r-1);
  outline: none;
}
.todo-form input:focus { border-color: var(--border-strong); }

/* Toolbar */
.toolbar {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.filters { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
  transition: 0.2s ease;
}
.chip:hover { border-color: var(--border-strong); }
.chip.is-active { border-color: var(--border-strong); box-shadow: 0 0 0 3px rgba(88,166,255,0.18); }

/* Buttons */
.btn {
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--text);
  font-weight: 900;
  cursor: pointer;
  transition: 0.2s ease;
}
.btn:hover { background: var(--surface-2); }
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
}
.btn.primary:hover { background: var(--primary-hover); }

.btn.danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}
.btn.danger:hover {
  background: rgba(220, 38, 38, 0.10);
  border-color: var(--danger-hover);
  color: var(--danger-hover);
}

/* List */
.todo-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 10px;
  display: grid;
  gap: 10px;
}

.todo-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;

  padding: 12px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}

.todo-item.done .todo-text {
  text-decoration: line-through;
  opacity: 0.65;
}

.todo-check {
  width: 18px;
  height: 18px;
  accent-color: var(--border-strong);
}

.todo-text {
  margin: 0;
  word-break: break-word;
}

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: 0.2s ease;
}
.icon-btn:hover { border-color: var(--danger-hover); color: var(--danger-hover); }

/* Stats */
.stats {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-weight: 800;
}

.muted { opacity: 0.8; }

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

/* ===== Header layout ===== */
.app-header{
  position: sticky;
  top: 0;
  z-index: 50;

  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;

  padding: 12px 24px;
  border-bottom: 1px solid var(--hud-line);
  background: rgba(0,0,0,0.12);
  backdrop-filter: blur(10px);
}

:root[data-theme="light"] .app-header{
  background: rgba(255,255,255,0.75);
}

.app-title{
  margin: 0;
  text-align: center;
}

.app-actions{
  justify-self: end;
  display: flex;
  gap: 10px;
  align-items: center;
}

/* ===== Icon buttons ===== */
.icon-btn{
  width: auto !important;              /* kills full-width bug */
  min-width: 40px;
  height: 36px;

  display: inline-flex !important;
  align-items: center;
  justify-content: center;

  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--hud-line);
  background: rgba(255,255,255,0.04);
  color: var(--text-primary);
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
}

:root[data-theme="light"] .icon-btn{
  background: rgba(0,0,0,0.03);
  border-color: rgba(15,23,42,0.18);
  color: #0f172a;
}

.icon-btn:hover{
  border-color: rgba(255,255,255,0.35);
  box-shadow: 0 10px 24px rgba(0,0,0,0.18);
}

/* optional: make lang a bit narrower */
.lang-btn{
  min-width: 44px;
  padding: 0 10px;
}