/* ═══════════════════════════════════════════════
   TaskFlow — styles.css
   Light theme default · Dark mode via body.dark
   ═══════════════════════════════════════════════ */

/* ── Reset ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Light Theme (default) ───────────────────────── */
:root {
  --bg:          #f4f6fb;
  --bg2:         #eef0f7;
  --bg3:         #e4e7f2;
  --surface:     rgba(255,255,255,0.8);
  --border:      rgba(0,0,0,0.09);
  --accent:      #6c63ff;
  --accent2:     #7c3aed;
  --accent-glow: rgba(108,99,255,0.25);
  --success:     #059669;
  --danger:      #dc2626;
  --warning:     #d97706;
  --text:        #1e1e2e;
  --text-muted:  #64748b;
  --radius:      14px;
  --shadow:      0 4px 20px rgba(0,0,0,0.1);
  --font:        'Inter', sans-serif;
  --header-bg:   rgba(244,246,251,0.85);
}

/* ── Dark Theme override ──────────────────────────── */
body.dark {
  --bg:          #0d0f17;
  --bg2:         #141722;
  --bg3:         #1c2033;
  --surface:     rgba(255,255,255,0.05);
  --border:      rgba(255,255,255,0.08);
  --accent:      #6c63ff;
  --accent2:     #a78bfa;
  --accent-glow: rgba(108,99,255,0.35);
  --success:     #22d3a5;
  --danger:      #f87171;
  --warning:     #fbbf24;
  --text:        #e2e8f0;
  --text-muted:  #64748b;
  --shadow:      0 8px 32px rgba(0,0,0,0.4);
  --header-bg:   rgba(13,15,23,0.85);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(108,99,255,0.07), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124,58,237,0.05), transparent);
}
body.dark {
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(108,99,255,0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(167,139,250,0.08), transparent);
}

/* ── Header ─────────────────────────────────────── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}
.header-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 1.4rem; }
.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-meta { display: flex; align-items: center; gap: 12px; }
.badge {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
}
.health-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.4s;
}
.health-dot.online  { background: var(--success); box-shadow: 0 0 8px var(--success); }
.health-dot.offline { background: var(--danger);  box-shadow: 0 0 8px var(--danger); }

/* ── Main ────────────────────────────────────────── */
.main {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

/* ── Section Title ───────────────────────────────── */
.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Form ────────────────────────────────────────── */
.task-form { width: 100%; }
.form-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.task-input {
  flex: 1;
  min-width: 200px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.task-input::placeholder { color: var(--text-muted); }
.task-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.priority-select {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 0.9rem;
  color: var(--text);
  font-size: 0.9rem;
  font-family: var(--font);
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}
.priority-select:focus { border-color: var(--accent); }

/* ── Buttons ─────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0.72rem 1.2rem;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font);
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  white-space: nowrap;
}
.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 18px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 6px 24px var(--accent-glow); }

.btn-danger-ghost {
  background: transparent;
  border: 1px solid rgba(248,113,113,0.3);
  color: var(--danger);
}
.btn-danger-ghost:hover { background: rgba(248,113,113,0.08); }

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  font-size: 0.85rem;
}
.btn-icon:hover { color: var(--text); border-color: var(--accent); }

/* ── Filters ─────────────────────────────────────── */
.filters-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
.filters { display: flex; gap: 6px; }
.filter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 18px;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 14px var(--accent-glow);
}

/* ── Task List ───────────────────────────────────── */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Task Card ───────────────────────────────────── */
.task-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  align-items: center;
  gap: 12px;
  backdrop-filter: blur(8px);
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.3s;
  animation: slideIn 0.25s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.task-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.12);
  border-color: var(--accent);
}
.task-card.done { opacity: 0.55; }
.task-card.done .task-title { text-decoration: line-through; color: var(--text-muted); }

/* Priority border-left */
.task-card[data-priority="high"]   { border-left: 3px solid var(--danger); }
.task-card[data-priority="medium"] { border-left: 3px solid var(--warning); }
.task-card[data-priority="low"]    { border-left: 3px solid var(--success); }

.task-checkbox {
  width: 20px; height: 20px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  font-size: 0.7rem;
}
.task-checkbox.checked {
  background: var(--success);
  border-color: var(--success);
  box-shadow: 0 0 10px rgba(34,211,165,0.4);
}

.task-info { flex: 1; min-width: 0; }
.task-title {
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s;
}
.task-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.task-actions { display: flex; gap: 6px; }

/* ── Empty State ─────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}
.empty-icon { font-size: 3rem; margin-bottom: 0.5rem; }

/* ── Toast ───────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 1.4rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  box-shadow: var(--shadow);
  z-index: 9999;
  transition: opacity 0.3s, transform 0.3s;
  transform: translateY(0);
}
.toast.hidden { opacity: 0; pointer-events: none; transform: translateY(10px); }

/* ── Easter Egg Overlay ──────────────────────────── */
.easter-egg {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(6px);
  animation: fadeIn 0.4s ease;
}
.easter-egg.hidden { display: none; }

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

.particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

.easter-egg-content {
  position: relative;
  z-index: 1;
  text-align: center;
}
.easter-egg-body {
  background: rgba(20,23,34,0.9);
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: 24px;
  padding: 2.5rem 3rem;
  max-width: 520px;
  box-shadow: 0 0 60px rgba(108,99,255,0.2), 0 20px 60px rgba(0,0,0,0.5);
  animation: popIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes popIn {
  from { opacity: 0; transform: scale(0.75); }
  to   { opacity: 1; transform: scale(1); }
}

.hello-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 999px;
  padding: 4px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 1.2rem;
  animation: pulse 2s infinite;
  cursor: pointer;
  transition: transform 0.2s;
}
.hello-badge:hover { transform: scale(1.08); }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50%       { box-shadow: 0 0 0 12px transparent; }
}
.hello-title {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(90deg, #fff 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.6rem;
}
.hello-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.highlight {
  color: var(--accent2);
  font-weight: 600;
}
.hello-code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  text-align: left;
  margin-bottom: 1.2rem;
}
.hello-code pre { overflow-x: auto; }
.hello-code code {
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.82rem;
  color: var(--accent2);
  line-height: 1.7;
}
.hello-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
kbd {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 7px;
  font-family: monospace;
  font-size: 0.82rem;
  color: var(--accent2);
}

/* ── Theme Toggle Button ─────────────────────────── */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  font-family: var(--font);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
  white-space: nowrap;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--bg3);
}
.theme-toggle .toggle-icon { font-size: 1rem; }

/* ── Utility ─────────────────────────────────────── */
.hidden { display: none !important; }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 600px) {
  .form-row { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .easter-egg-body { padding: 1.8rem 1.5rem; }
  .hello-title { font-size: 2rem; }
  .theme-toggle span:not(.toggle-icon) { display: none; }
}