/* ── System Font Stack ── */
:root {
  /* Light Mode (Default) */
  --bg:      #ffffff;
  --bg2:     #f6f8fa;
  --bg3:     #eaeef2;
  --bg4:     #d0d7de;
  --border:  rgba(0,0,0,0.08);
  --text:    #1f2328;
  --muted:   #636c76;
  --accent:  #fbc400;
  --accent2: #0969da;
  --green:   #1a7f37;
  --radius:  16px;
  --shadow:  0 4px 12px rgba(0,0,0,0.08);
  --ball-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

body.dark-mode {
  /* Dark Mode */
  --bg:      #0d1117;
  --bg2:     #161b22;
  --bg3:     #1c2230;
  --bg4:     #222b3a;
  --border:  rgba(255,255,255,0.08);
  --text:    #e6edf3;
  --muted:   #8b949e;
  --accent:  #fbc400;
  --accent2: #4f9cf9;
  --green:   #4caf50;
  --shadow:  0 4px 12px rgba(0,0,0,0.5);
  --ball-shadow: 0 6px 16px rgba(0,0,0,0.5);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 56px 20px 80px;
  transition: background 0.3s, color 0.3s;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg3); border-radius: 3px; }

/* ───────────── HEADER ───────────── */
header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
  width: 100%;
  max-width: 600px;
}

.theme-toggle {
  position: absolute;
  top: -40px;
  right: 0;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 20px;
  transition: all 0.2s;
  box-shadow: var(--shadow);
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}

.logo-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent2);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

h1 {
  font-size: clamp(24px, 5vw, 42px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 10px;
  white-space: nowrap;
}

h1 .blue { color: var(--accent2); }
h1 .gold { color: var(--accent); }

.tagline {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
}

.data-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 5px 14px;
  font-size: 11.5px;
  color: var(--muted);
}

.data-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
}

/* ───────────── MODE TOGGLE ───────────── */
.mode-wrap {
  display: flex;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  gap: 4px;
  margin-bottom: 12px;
}

.mode-btn {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 9px 22px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  background: transparent;
  color: var(--muted);
  transition: all 0.2s;
  white-space: nowrap;
}

.mode-btn.active {
  background: var(--bg4);
  color: var(--text);
  box-shadow: var(--shadow);
}

/* ───────────── TOP-N 서브 셀렉터 ───────────── */
.topn-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.35s ease, opacity 0.25s ease, margin-bottom 0.35s ease;
}

.topn-wrap.visible {
  max-height: 120px;
  opacity: 1;
  margin-bottom: 24px;
}

.topn-label {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.topn-label strong { color: var(--accent); }

.topn-btns {
  display: flex;
  gap: 7px;
}

.topn-btn {
  cursor: pointer;
  width: 44px; height: 44px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg3);
  color: var(--muted);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  transition: all 0.2s;
  display: flex; align-items: center; justify-content: center;
}

.topn-btn:hover {
  border-color: rgba(251,196,0,0.4);
  color: var(--text);
}

.topn-btn.active {
  background: linear-gradient(135deg, #fbc400, #e67e00);
  border-color: transparent;
  color: #111;
  box-shadow: 0 4px 12px rgba(251,196,0,0.35);
  transform: scale(1.1);
}

/* 고정 볼 표시 */
.ball.fixed-ball {
  box-shadow:
    inset 0 -4px 8px rgba(0,0,0,0.3),
    inset 0 2px 4px rgba(255,255,255,0.15),
    var(--ball-shadow),
    0 0 0 3px rgba(251,196,0,0.7);
}

.pin-icon {
  font-size: 9px;
  text-align: center;
  line-height: 1;
  height: 12px;
}

/* ───────────── BOARD ───────────── */
.board {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}

.game-row {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: border-color 0.25s;
}

.game-row:hover { border-color: rgba(251,196,0,0.2); }

.game-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  min-width: 30px;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
}

.balls {
  display: flex;
  flex: 1;
  justify-content: space-evenly;
  align-items: flex-end;
}

/* ───────────── BALL ───────────── */
.ball-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; }

.ball {
  width: 52px; height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.35);
  position: relative;
  opacity: 0;
  transform: scale(0.3) rotate(-15deg);
  transition: opacity 0.3s, transform 0.42s cubic-bezier(0.34,1.56,0.64,1);
  box-shadow:
    inset 0 -4px 8px rgba(0,0,0,0.3),
    inset 0 2px 4px rgba(255,255,255,0.15),
    var(--ball-shadow);
  cursor: default;
}

.ball::after {
  content: '';
  position: absolute;
  top: 7px; left: 9px;
  width: 14px; height: 9px;
  background: rgba(255,255,255,0.28);
  border-radius: 50%;
  transform: rotate(-30deg);
}

.ball.show { opacity: 1; transform: scale(1) rotate(0deg); }

/* 로또 공 색상 */
.ball.y { background: radial-gradient(circle at 35% 30%, #ffe566, #f9a800); }  /* 1–10 */
.ball.b { background: radial-gradient(circle at 35% 30%, #90caf9, #1565c0); }  /* 11–20 */
.ball.r { background: radial-gradient(circle at 35% 30%, #ef9a9a, #c62828); }  /* 21–30 */
.ball.s { background: radial-gradient(circle at 35% 30%, #cfd8dc, #546e7a); }  /* 31–40 */
.ball.g { background: radial-gradient(circle at 35% 30%, #dce775, #558b2f); }  /* 41–45 */

.ball-placeholder {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--bg3);
  border: 2px dashed var(--border);
}

.ball-rank {
  font-size: 9px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity 0.3s 0.5s;
  height: 12px;
}

.ball-rank.hot { color: var(--accent); }
.ball-rank.visible { opacity: 1; }

/* ───────────── BUTTONS ───────────── */
.btn-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 44px;
}

.btn {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-weight: 700;
  font-size: 15px;
  padding: 15px 34px;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

.btn:active { transform: scale(0.95) !important; }

.btn-primary {
  background: linear-gradient(135deg, #fbc400 0%, #e67e00 100%);
  color: #111;
  box-shadow: 0 4px 20px rgba(251,196,0,0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(251,196,0,0.42);
}

.btn-secondary {
  background: var(--bg2);
  color: var(--muted);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text);
  border-color: rgba(0,0,0,0.1);
  transform: translateY(-2px);
}

body.dark-mode .btn-secondary:hover {
    border-color: rgba(255,255,255,0.2);
}

/* ───────────── STATS PANEL ───────────── */
.stats-panel {
  width: 100%;
  max-width: 600px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 32px;
}

.stats-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.stats-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stats-header h2 {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stats-toggle-icon {
  font-size: 13px;
  color: var(--muted);
  transition: transform 0.3s;
}

.stats-toggle-icon.open { transform: rotate(180deg); }

.stats-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.stats-body.open { max-height: 600px; }

.stats-inner { padding: 20px; }

/* 정렬 탭 */
.sort-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}

.sort-tab {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 11px;
  font-weight: 600;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  transition: all 0.15s;
}

.sort-tab.active {
  background: var(--bg4);
  color: var(--text);
  border-color: rgba(0,0,0,0.1);
}

body.dark-mode .sort-tab.active {
    border-color: rgba(255,255,255,0.2);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  gap: 7px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 10px 6px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg3);
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.stat-card.picked {
  border-color: rgba(251,196,0,0.55);
  background: rgba(251,196,0,0.05);
  transform: scale(1.04);
}

.stat-num {
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.stat-bar-wrap {
  width: 100%;
  height: 4px;
  background: rgba(0,0,0,0.06);
  border-radius: 2px;
  overflow: hidden;
}

body.dark-mode .stat-bar-wrap {
    background: rgba(255,255,255,0.06);
}

.stat-bar {
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, #fbc400, #e67e00);
}

.stat-count {
  font-size: 10px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ───────────── CONTACT FORM ───────────── */
.contact-section {
  width: 100%;
  max-width: 600px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
  margin-bottom: 32px;
}

.contact-header { margin-bottom: 20px; }

.contact-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.contact-desc {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: inherit;
  font-size: 13.5px;
  padding: 10px 13px;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  width: 100%;
  resize: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(251,196,0,0.15);
}

.form-group select option {
  background: var(--bg2);
  color: var(--text);
}

.form-submit {
  width: 100%;
  margin-top: 4px;
}

.form-success {
  display: none;
  text-align: center;
  color: var(--green);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 0;
}

@media (max-width: 500px) {
  .form-row { grid-template-columns: 1fr; }
  .contact-section { padding: 20px 16px; }
}

/* ───────────── FOOTER NOTICE ───────────── */
.notice {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  line-height: 1.85;
  max-width: 480px;
}

.notice strong { color: var(--accent); }
.notice a { color: var(--muted); }

/* ───────────── RESPONSIVE ───────────── */
@media (max-width: 500px) {
  .ball, .ball-placeholder { width: 44px; height: 44px; font-size: 15px; }
  .game-row { padding: 14px 12px; gap: 10px; }
  .balls { gap: 7px; }
  .ball::after { top: 5px; left: 6px; width: 11px; height: 7px; }
  .btn { padding: 13px 24px; font-size: 14px; }
  .theme-toggle { top: -50px; }
}