/* ============================================
   ToDo-BytePath — Styles
   ============================================ */

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

:root {
  --blue:   #0C447C;
  --gold:   #E6B84A;
  --bg:     #F5F7FA;
  --white:  #ffffff;
  --text:   #1a1a2e;
  --light:  #6b7280;
  --border: #e5e7eb;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(12,68,124,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ─── APP SHELL ─── */
.app {
  width: 100%;
  max-width: 520px;
}

/* ─── HEADER ─── */
.app-header {
  text-align: center;
  margin-bottom: 2rem;
}

.logo {
  font-size: 1rem;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
}

.logo span {
  color: var(--gold);
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--blue);
}

/* ─── MAIN CARD ─── */
.app-main {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

/* ─── ADD FORM ─── */
.add-form {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.task-input {
  flex: 1;
  padding: 1rem 1.25rem;
  border: none;
  outline: none;
  font-size: 1rem;
  color: var(--text);
  background: transparent;
}

.task-input::placeholder {
  color: var(--light);
}

.add-btn {
  padding: 1rem 1.5rem;
  background: var(--blue);
  color: var(--white);
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.add-btn:hover {
  background: #0a3a6b;
}

/* ─── FILTERS ─── */
.filters {
  display: flex;
  gap: 0.5rem;
  padding: 0.875rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  padding: 0.35rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--light);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.filter-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--white);
}

/* ─── TASK LIST ─── */
.task-list {
  list-style: none;
  min-height: 80px;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

.task-item:last-child {
  border-bottom: none;
}

.task-item:hover {
  background: var(--bg);
}

.task-checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.task-checkbox.checked {
  background: var(--gold);
  border-color: var(--gold);
}

.task-checkbox.checked::after {
  content: '✓';
  font-size: 0.75rem;
  color: var(--white);
  font-weight: 700;
}

.task-text {
  flex: 1;
  font-size: 0.95rem;
  line-height: 1.4;
  transition: all 0.2s;
}

.task-text.completed {
  text-decoration: line-through;
  color: var(--light);
}

.delete-btn {
  background: none;
  border: none;
  color: var(--border);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.25rem;
  border-radius: 4px;
  transition: color 0.2s;
  opacity: 0;
}

.task-item:hover .delete-btn {
  opacity: 1;
}

.delete-btn:hover {
  color: #ef4444;
}

/* ─── EMPTY STATE ─── */
.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--light);
  font-size: 0.9rem;
}

/* ─── FOOTER ─── */
.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--light);
}

.clear-btn {
  background: none;
  border: none;
  color: var(--light);
  font-size: 0.8rem;
  cursor: pointer;
  transition: color 0.2s;
}

.clear-btn:hover {
  color: #ef4444;
}