/* =========================================================================
   Couple Todo — Core Design System
   Midnight navy base, soft purple/pink accents, glassmorphism cards.
   ========================================================================= */

:root {
  --bg-void: #070912;
  --bg-navy-1: #0b1020;
  --bg-navy-2: #10162b;
  --bg-navy-3: #161d38;

  --accent-pink: #ec4899;
  --accent-purple: #8b5cf6;
  --accent-violet: #6366f1;
  --accent-blue: #38bdf8;
  --accent-amber: #f59e0b;
  --accent-green: #22c55e;
  --accent-red: #f87171;

  --grad-primary: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-pink) 100%);
  --grad-subtle: linear-gradient(160deg, rgba(139,92,246,0.18) 0%, rgba(236,72,153,0.10) 100%);

  --text-hi: #f4f5fb;
  --text-mid: #b7bcd6;
  --text-low: #7c8199;

  --glass-bg: rgba(255, 255, 255, 0.045);
  --glass-bg-strong: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-shadow: 0 8px 32px rgba(3, 5, 16, 0.45);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --transition-fast: 140ms ease;
  --transition-mid: 240ms cubic-bezier(.2,.7,.3,1);
}

[data-theme="light"] {
  --bg-void: #f3f4fb;
  --bg-navy-1: #ffffff;
  --bg-navy-2: #f7f7fd;
  --bg-navy-3: #eef0fb;
  --text-hi: #14162a;
  --text-mid: #4b4f6b;
  --text-low: #868aa8;
  --glass-bg: rgba(20, 22, 42, 0.03);
  --glass-bg-strong: rgba(20, 22, 42, 0.05);
  --glass-border: rgba(20, 22, 42, 0.08);
  --glass-shadow: 0 8px 28px rgba(20, 22, 42, 0.08);
}

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

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(139,92,246,0.16), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(236,72,153,0.12), transparent 55%),
    var(--bg-void);
  color: var(--text-hi);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4, h5, h6 { font-weight: 700; letter-spacing: -0.01em; color: var(--text-hi); }

::selection { background: var(--accent-purple); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent-pink);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------------------------------------------------------------------
   Glass card
   --------------------------------------------------------------------- */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.glass-card-strong {
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
}

/* ---------------------------------------------------------------------
   Buttons
   --------------------------------------------------------------------- */
.btn-brand {
  background: var(--grad-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-pill);
  padding: 0.65rem 1.5rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  box-shadow: 0 8px 24px rgba(139,92,246,0.35);
}
.btn-brand:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(139,92,246,0.45); color: #fff; }
.btn-brand:active { transform: translateY(0); }
.btn-brand:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: var(--glass-bg);
  color: var(--text-hi);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  padding: 0.6rem 1.4rem;
  font-weight: 600;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.btn-ghost:hover { background: var(--glass-bg-strong); color: var(--text-hi); border-color: rgba(236,72,153,0.4); }

.btn-danger-soft {
  background: rgba(248,113,113,0.12);
  color: var(--accent-red);
  border: 1px solid rgba(248,113,113,0.35);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1.2rem;
  font-weight: 600;
}
.btn-danger-soft:hover { background: rgba(248,113,113,0.2); color: var(--accent-red); }

.icon-btn {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-mid);
  transition: all var(--transition-fast);
}
.icon-btn:hover { color: var(--text-hi); background: var(--glass-bg-strong); }

/* ---------------------------------------------------------------------
   Forms
   --------------------------------------------------------------------- */
.form-control, .form-select {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--glass-border);
  color: var(--text-hi);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.9rem;
}
.form-control:focus, .form-select:focus {
  background: rgba(255,255,255,0.06);
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.25);
  color: var(--text-hi);
}
.form-control::placeholder { color: var(--text-low); }
.form-label { color: var(--text-mid); font-weight: 600; font-size: 0.88rem; margin-bottom: 0.4rem; }
.form-text { color: var(--text-low); }
.invalid-feedback { display: block; color: var(--accent-red); font-size: 0.82rem; margin-top: 0.25rem; }

.form-check-input {
  background-color: rgba(255,255,255,0.06);
  border-color: var(--glass-border);
}
.form-check-input:checked {
  background-color: var(--accent-purple);
  border-color: var(--accent-purple);
}

/* Password strength meter */
.pw-strength { height: 5px; border-radius: 4px; background: rgba(255,255,255,0.08); overflow: hidden; margin-top: 8px; }
.pw-strength-bar { height: 100%; width: 0%; transition: width var(--transition-mid), background var(--transition-mid); border-radius: 4px; }
.pw-strength-label { font-size: 0.78rem; color: var(--text-low); margin-top: 4px; }

/* ---------------------------------------------------------------------
   Badges
   --------------------------------------------------------------------- */
.badge-priority {
  font-size: 0.72rem; font-weight: 700; padding: 0.28rem 0.65rem;
  border-radius: var(--radius-pill); letter-spacing: 0.02em; text-transform: uppercase;
}
.badge-priority.low { background: rgba(56,189,248,0.15); color: var(--accent-blue); }
.badge-priority.medium { background: rgba(139,92,246,0.18); color: var(--accent-purple); }
.badge-priority.high { background: rgba(245,158,11,0.18); color: var(--accent-amber); }
.badge-priority.urgent { background: rgba(248,113,113,0.18); color: var(--accent-red); }

.badge-status { font-size: 0.72rem; font-weight: 600; padding: 0.28rem 0.6rem; border-radius: var(--radius-pill); }
.badge-status.pending { background: rgba(183,188,214,0.12); color: var(--text-mid); }
.badge-status.in_progress { background: rgba(56,189,248,0.15); color: var(--accent-blue); }
.badge-status.completed { background: rgba(34,197,94,0.16); color: var(--accent-green); }
.badge-status.overdue { background: rgba(248,113,113,0.18); color: var(--accent-red); }

/* ---------------------------------------------------------------------
   Toasts
   --------------------------------------------------------------------- */
#toast-stack {
  position: fixed; top: 1rem; right: 1rem; z-index: 2000;
  display: flex; flex-direction: column; gap: 0.6rem;
  max-width: 340px;
}
.ct-toast {
  padding: 0.8rem 1rem; border-radius: var(--radius-md);
  background: var(--glass-bg-strong); border: 1px solid var(--glass-border);
  backdrop-filter: blur(16px); box-shadow: var(--glass-shadow);
  color: var(--text-hi); font-size: 0.9rem; font-weight: 500;
  display: flex; align-items: center; gap: 0.6rem;
  animation: toast-in var(--transition-mid);
}
.ct-toast.success { border-color: rgba(34,197,94,0.4); }
.ct-toast.error { border-color: rgba(248,113,113,0.4); }
.ct-toast .toast-icon { font-size: 1.1rem; }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* ---------------------------------------------------------------------
   Empty states
   --------------------------------------------------------------------- */
.empty-state {
  text-align: center; padding: 3.5rem 1.5rem; color: var(--text-mid);
}
.empty-state .emoji { font-size: 2.6rem; margin-bottom: 0.75rem; }
.empty-state h5 { color: var(--text-hi); margin-bottom: 0.4rem; }

/* ---------------------------------------------------------------------
   Loading spinner
   --------------------------------------------------------------------- */
.ct-spinner {
  width: 1rem; height: 1rem; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.25); border-top-color: #fff;
  display: inline-block; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------------------
   Utility
   --------------------------------------------------------------------- */
.text-muted-soft { color: var(--text-mid) !important; }
.text-faint { color: var(--text-low) !important; }
.gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--accent-purple);
  color: #fff; padding: 0.6rem 1rem; z-index: 3000; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }