@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Caveat:wght@500;700&family=DM+Sans:wght@300;400;500&display=swap');

/* ===== VARIABLES ===== */
:root {
  --bg: #0F0F1A;
  --surface: #1A1A2E;
  --surface2: #16213E;
  --primary: #E94560;
  --primary-glow: rgba(233, 69, 96, 0.35);
  --secondary: #0F3460;
  --accent: #FFD460;
  --accent-glow: rgba(255, 212, 96, 0.3);
  --teal: #4ECDC4;
  --teal-glow: rgba(78, 205, 196, 0.3);
  --text: #F0F0F5;
  --text-muted: #8888AA;
  --border: rgba(255,255,255,0.08);
  --radius: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light {
  --bg: #F0F2FF;
  --surface: #FFFFFF;
  --surface2: #F7F8FF;
  --text: #1A1A2E;
  --text-muted: #8888AA;
  --border: rgba(0,0,0,0.08);
}

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

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

/* Animated background mesh */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(233, 69, 96, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(78, 205, 196, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(255, 212, 96, 0.04) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ===== HEADER ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2.5rem;
  background: rgba(15, 15, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

body.light header {
  background: rgba(240, 242, 255, 0.85);
}

header h1 {
  font-family: 'Syne', sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

header div {
  display: flex;
  gap: 0.8rem;
  align-items: center;
}

/* ===== ADD NOTE BUTTON ===== */
.add-note-btn {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  padding: 0.55rem 1.4rem;
  border-radius: 50px;
  font-family: 'Syne', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.3px;
  position: relative;
  overflow: hidden;
  z-index: 0;
}

.add-note-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
  z-index: -1;
}

.add-note-btn:hover {
  color: white;
  box-shadow: 0 0 20px var(--primary-glow);
  transform: translateY(-2px);
}

.add-note-btn:hover::before {
  transform: scaleX(1);
}

/* ===== THEME TOGGLE ===== */
.theme-toggle-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle-btn:hover {
  transform: rotate(25deg) scale(1.1);
  box-shadow: 0 0 15px var(--accent-glow);
  border-color: var(--accent);
}

/* ===== NOTES GRID ===== */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 2.5rem;
  max-width: 1300px;
  margin: auto;
  position: relative;
  z-index: 1;
}

/* ===== NOTE CARD ===== */
.note-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.6rem;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  animation: cardIn 0.4s ease forwards;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.note-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--card-color, var(--primary)), transparent);
}

.note-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(255,255,255,0.03), transparent 60%);
  pointer-events: none;
}

.note-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255,255,255,0.15);
  box-shadow:
    0 20px 40px rgba(0,0,0,0.3),
    0 0 0 1px rgba(255,255,255,0.05);
}

.note-card h3 {
  font-family: 'Syne', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
  color: var(--text);
  line-height: 1.3;
}

.note-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.note-meta {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 1rem;
  opacity: 0.7;
}

.note-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.1rem;
}

.edit-btn, .delete-btn {
  flex: 1;
  padding: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  background: transparent;
  color: var(--text-muted);
}

.edit-btn:hover {
  background: var(--teal);
  color: #0F0F1A;
  border-color: var(--teal);
  box-shadow: 0 0 15px var(--teal-glow);
}

.delete-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}

/* ===== EMPTY STATE ===== */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 5rem 2rem;
  color: var(--text-muted);
}

.empty-state p {
  font-family: 'Caveat', cursive;
  font-size: 1.6rem;
  opacity: 0.6;
}

/* ===== DIALOG ===== */
dialog {
  border: none;
  border-radius: var(--radius);
  padding: 0;
  width: 92%;
  max-width: 500px;
  background: var(--surface2);
  color: var(--text);
  box-shadow:
    0 30px 80px rgba(0,0,0,0.5),
    0 0 0 1px rgba(255,255,255,0.06);
}

dialog::backdrop {
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
}

dialog[open] {
  animation: dialogIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes dialogIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.dialog-content {
  padding: 2rem;
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.8rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border);
}

.dialog-title {
  font-family: 'Caveat', cursive;
  font-size: 1.7rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.close-btn {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}

/* ===== FORM ===== */
.form-group {
  margin-bottom: 1.3rem;
}

.form-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  background: rgba(255,255,255,0.04);
  color: var(--text);
  outline: none;
  transition: var(--transition);
}

body.light .form-input,
body.light .form-textarea {
  background: rgba(0,0,0,0.03);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
  background: rgba(233, 69, 96, 0.05);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ===== DIALOG ACTIONS ===== */
.dialog-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: flex-end;
  margin-top: 1.8rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
}

.cancel-btn {
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}

.cancel-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

.save-btn {
  background: linear-gradient(135deg, var(--primary), #FF6B8A);
  color: white;
  border: none;
  padding: 0.6rem 1.6rem;
  border-radius: 50px;
  font-family: 'Syne', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px var(--primary-glow);
}

.save-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
  letter-spacing: 0.3px;
}

footer strong {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 10px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  header { padding: 1rem 1.2rem; }
  header h1 { font-size: 1.4rem; }
  .notes-grid { padding: 1.2rem; }
  dialog { width: 96%; }
  .dialog-content { padding: 1.4rem; }
}