@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

:root {
  --bg: #f0f2f5;
  --bg2: #ffffff;
  --text: #1a1a2e;
  --text2: #555;
  --accent: #6c5ce7;
  --accent2: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.25);
  --card-shadow: 0 4px 20px rgba(0,0,0,0.06);
  --card-hover: 0 8px 30px rgba(108, 92, 231, 0.15);
  --border: #e2e5ea;
  --tag-bg: #f0edff;
  --tag-text: #6c5ce7;
  --input-bg: #f7f8fa;
  --danger: #e74c3c;
  --success: #2ecc71;
  --gradient: linear-gradient(135deg, #6c5ce7, #a29bfe, #74b9ff);
}

.dark {
  --bg: #0f0f1a;
  --bg2: #1a1a2e;
  --text: #eaeaea;
  --text2: #aaa;
  --border: #2a2a3e;
  --tag-bg: rgba(108, 92, 231, 0.2);
  --tag-text: #a29bfe;
  --input-bg: #16162a;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.3);
  --card-hover: 0 8px 30px rgba(108, 92, 231, 0.25);
  --accent-glow: rgba(108, 92, 231, 0.4);
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.4s, color 0.4s;
}

/* ===== HEADER ===== */
header {
  background: var(--gradient);
  padding: 40px 20px 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 30px 30px;
  animation: moveGrid 20s linear infinite;
}

@keyframes moveGrid {
  0% { transform: translate(0, 0); }
  100% { transform: translate(30px, 30px); }
}

header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

header p {
  color: rgba(255,255,255,0.85);
  font-size: 1.05rem;
  margin-top: 8px;
  position: relative;
  z-index: 1;
}

.header-controls {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  gap: 10px;
  z-index: 2;
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 2px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  transition: all 0.3s;
}

.icon-btn:hover {
  background: rgba(255,255,255,0.3);
  transform: scale(1.1);
}

/* ===== CONTAINER ===== */
.container {
  max-width: 900px;
  margin: -50px auto 40px;
  padding: 0 20px;
  position: relative;
  z-index: 2;
}

/* ===== SEARCH ===== */
.search-box {
  background: var(--bg2);
  border-radius: 18px;
  padding: 8px;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  border: 2px solid transparent;
  transition: border 0.3s;
}

.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.search-box .search-icon {
  padding: 10px 14px;
  font-size: 1.2rem;
  opacity: 0.5;
}

.search-box input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 1rem;
  color: var(--text);
  font-family: inherit;
}

.search-box input::placeholder { color: var(--text2); opacity: 0.6; }

/* ===== STATS ===== */
.stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.stat-chip {
  background: var(--bg2);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text2);
  box-shadow: var(--card-shadow);
}

.stat-chip span {
  color: var(--accent);
}

/* ===== FILTERS ===== */
.filters {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.filters label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text2);
  margin-right: 4px;
}

.filter-btn {
  padding: 7px 16px;
  border-radius: 20px;
  border: 2px solid var(--border);
  background: var(--bg2);
  color: var(--text2);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  font-family: inherit;
}

.filter-btn:hover {
  border-color: var(--accent2);
  color: var(--accent);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== WORD LIST ===== */
.word-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.word-card {
  background: var(--bg2);
  border-radius: 16px;
  padding: 22px 24px;
  box-shadow: var(--card-shadow);
  border: 2px solid transparent;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: default;
  position: relative;
  overflow: hidden;
  animation: cardIn 0.4s ease both;
}

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

.word-card:hover {
  box-shadow: var(--card-hover);
  border-color: var(--accent2);
  transform: translateY(-2px);
}

.word-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient);
  border-radius: 4px 0 0 4px;
  opacity: 0;
  transition: opacity 0.3s;
}

.word-card:hover::before { opacity: 1; }

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.word-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.word-title mark {
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 2px;
}

.word-meaning {
  font-size: 0.95rem;
  color: var(--text2);
  line-height: 1.6;
}

.word-meaning mark {
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 2px;
}

.word-example {
  margin-top: 10px;
  padding: 10px 14px;
  background: var(--input-bg);
  border-radius: 10px;
  font-size: 0.88rem;
  color: var(--text2);
  font-style: italic;
  border-left: 3px solid var(--accent2);
}

.word-example mark {
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 3px;
  padding: 0 2px;
}

.card-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  flex-wrap: wrap;
  gap: 8px;
}

.word-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--tag-bg);
  color: var(--tag-text);
}

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

.card-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: var(--input-bg);
  color: var(--text2);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}

.card-btn:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.15);
}

.card-btn.fav-active {
  background: #ffeaa7;
  color: #f39c12;
}

.card-btn.fav-active:hover {
  background: #f39c12;
  color: #fff;
}

.card-btn.del-btn:hover {
  background: var(--danger);
  color: #fff;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text2);
}

.empty-state .emoji {
  font-size: 3rem;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 1rem;
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s;
}

.modal-overlay.show { display: flex; }

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

.modal {
  background: var(--bg2);
  border-radius: 22px;
  padding: 32px;
  width: 100%;
  max-width: 520px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  animation: modalIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

.modal h2 {
  font-size: 1.4rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text2);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--input-bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 70px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  padding: 12px 24px;
  border-radius: 12px;
  border: none;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.3s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  flex: 1;
}

.btn-primary:hover {
  background: #5b4bd5;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--input-bg);
  color: var(--text2);
}

.btn-secondary:hover {
  background: var(--border);
}

/* ===== FAB ===== */
.fab {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 60px;
  height: 60px;
  border-radius: 18px;
  background: var(--gradient);
  border: none;
  color: #fff;
  font-size: 1.8rem;
  cursor: pointer;
  box-shadow: 0 6px 25px rgba(108, 92, 231, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  z-index: 100;
}

.fab:hover {
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 8px 35px rgba(108, 92, 231, 0.5);
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
  z-index: 2000;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
  header h1 { font-size: 1.8rem; }
  header { padding: 30px 16px 70px; }
  .container { padding: 0 14px; }
  .word-card { padding: 18px; }
  .modal { padding: 24px; }
  .header-controls { top: 14px; right: 14px; }
  .fab { bottom: 20px; right: 20px; width: 54px; height: 54px; font-size: 1.5rem; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent2); border-radius: 4px; }