:root {
  --bg: #0a0e1a;
  --bg2: #111827;
  --card: #1a2235;
  --border: #2a3a55;
  --accent: #00c896;
  --accent2: #0084ff;
  --red: #ff4757;
  --text: #e2e8f0;
  --text2: #94a3b8;
  --yellow: #f59e0b;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', 'Noto Sans KR', sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { opacity: 0.8; }

/* ───── NAV ───── */
nav {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 200;
}

.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  margin-right: 32px;
  letter-spacing: -0.5px;
  white-space: nowrap;
}
.nav-logo span { color: var(--text2); font-size: 11px; margin-left: 6px; }

.nav-links { display: flex; gap: 2px; flex: 1; flex-wrap: nowrap; overflow-x: auto; }
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
  color: var(--text2);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  transition: all .15s;
  white-space: nowrap;
}
.nav-links a:hover, .nav-links a.active {
  background: var(--border);
  color: var(--text);
}

.nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

/* 햄버거 버튼 (모바일) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all .2s;
}

/* 모바일 드로어 */
.nav-drawer {
  display: none;
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg2);
  z-index: 199;
  padding: 16px;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}
.nav-drawer.open { display: flex; }
.nav-drawer a {
  color: var(--text2);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.nav-drawer a:hover { background: var(--border); color: var(--text); }
.nav-drawer .drawer-divider {
  border-top: 1px solid var(--border);
  margin: 8px 0;
}

/* ───── BADGE ───── */
.badge {
  background: var(--accent);
  color: #000;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.badge.admin { background: var(--red); color: #fff; }

/* ───── LAYOUT ───── */
.container { max-width: 1200px; margin: 0 auto; padding: 24px; }
.page-title { font-size: 22px; font-weight: 600; margin-bottom: 24px; }

/* ───── CARD ───── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.card-title {
  color: var(--text2);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 11px;
}

/* ───── GRID ───── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* ───── BALANCE ───── */
.balance-val { font-size: 26px; font-weight: 700; color: var(--accent); margin: 4px 0; }
.balance-sub { font-size: 12px; color: var(--text2); }

/* ───── TICKER ───── */
.ticker { display: flex; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.ticker:last-child { border-bottom: none; }
.ticker-name { font-weight: 600; width: 60px; }
.ticker-price { flex: 1; font-size: 16px; font-weight: 700; }
.ticker-change { font-size: 12px; }
.up { color: var(--accent); }
.down { color: var(--red); }

/* ───── TABLE ───── */
table { width: 100%; border-collapse: collapse; }
th {
  text-align: left; padding: 10px 12px;
  color: var(--text2); font-size: 11px;
  text-transform: uppercase; border-bottom: 1px solid var(--border);
}
td { padding: 10px 12px; border-bottom: 1px solid rgba(42,58,85,.4); font-size: 13px; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,.02); }

/* ───── FORM ───── */
.form-group { margin-bottom: 16px; }
label { display: block; margin-bottom: 6px; font-size: 12px; color: var(--text2); }

input, select, textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border .15s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent2); }
textarea { resize: vertical; min-height: 80px; }

/* ───── BUTTON ───── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 8px; border: none;
  cursor: pointer; font-size: 14px; font-weight: 500; transition: all .15s;
}
.btn-primary { background: var(--accent); color: #000; }
.btn-primary:hover { opacity: .85; }
.btn-secondary { background: var(--border); color: var(--text); }
.btn-secondary:hover { background: #3a4a65; }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { opacity: .85; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-block { width: 100%; justify-content: center; }

/* ───── ALERT ───── */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13px; line-height: 1.6; }
.alert-error   { background: rgba(255,71,87,.15);  border: 1px solid rgba(255,71,87,.3);  color: #ff6b7a; }
.alert-success { background: rgba(0,200,150,.1);   border: 1px solid rgba(0,200,150,.3);  color: var(--accent); }
.alert-warning { background: rgba(245,158,11,.1);  border: 1px solid rgba(245,158,11,.3); color: var(--yellow); }

/* ───── VULN TAG ───── */
.vuln-tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 10px; font-weight: 600;
  background: rgba(255,71,87,.2); color: var(--red);
  border: 1px solid rgba(255,71,87,.3); margin-left: 8px;
}

/* ───── VULN ATTACK BANNER ───── */
.attack-banner {
  position: fixed; top: 56px; left: 0; right: 0; z-index: 190;
  background: linear-gradient(90deg, rgba(255,71,87,.95), rgba(180,20,40,.95));
  border-bottom: 2px solid var(--red);
  padding: 10px 24px;
  display: flex; align-items: center; gap: 12px;
  animation: slideDown .3s ease;
  box-shadow: 0 4px 20px rgba(255,71,87,.3);
}
.attack-banner .ab-icon { font-size: 20px; flex-shrink: 0; }
.attack-banner .ab-body { flex: 1; }
.attack-banner .ab-title { font-weight: 700; font-size: 13px; color: #fff; }
.attack-banner .ab-desc  { font-size: 12px; color: rgba(255,255,255,.8); margin-top: 2px; }
.attack-banner .ab-close {
  background: rgba(255,255,255,.2); border: none; color: #fff;
  border-radius: 50%; width: 24px; height: 24px; cursor: pointer;
  font-size: 14px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
}
.attack-banner .ab-link { font-size: 11px; color: rgba(255,255,255,.9); text-decoration: underline; flex-shrink: 0; }

@keyframes slideDown { from { transform: translateY(-100%); opacity:0; } to { transform: translateY(0); opacity:1; } }

/* ───── TOAST ───── */
#toast-container {
  position: fixed; bottom: 24px; right: 24px;
  display: flex; flex-direction: column; gap: 8px;
  z-index: 9999; pointer-events: none;
}
.toast {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 16px;
  display: flex; align-items: flex-start; gap: 10px;
  min-width: 280px; max-width: 360px;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
  animation: toastIn .25s ease;
  pointer-events: all;
}
.toast.success { border-left: 3px solid var(--accent); }
.toast.error   { border-left: 3px solid var(--red); }
.toast.warning { border-left: 3px solid var(--yellow); }
.toast.info    { border-left: 3px solid var(--accent2); }
.toast-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }
.toast-body { flex: 1; }
.toast-title { font-size: 13px; font-weight: 600; margin-bottom: 2px; }
.toast-msg   { font-size: 12px; color: var(--text2); line-height: 1.4; }
.toast-close { background: none; border: none; color: var(--text2); cursor: pointer; font-size: 16px; padding: 0; flex-shrink: 0; }
@keyframes toastIn { from { transform: translateX(40px); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toastOut { to { transform: translateX(40px); opacity: 0; } }

/* ───── CHALLENGE CARD ───── */
.challenge-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 16px; margin-bottom: 12px;
  transition: border-color .2s;
}
.challenge-card:hover { border-color: var(--accent2); }
.challenge-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.difficulty { padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 600; }
.difficulty.easy   { background: rgba(0,200,150,.15);  color: var(--accent); }
.difficulty.medium { background: rgba(245,158,11,.15); color: var(--yellow); }
.difficulty.hard   { background: rgba(255,71,87,.15);  color: var(--red); }

/* ───── HERO ───── */
.hero { text-align: center; padding: 80px 24px; }
.hero h1 { font-size: 40px; font-weight: 700; margin-bottom: 12px; }
.hero h1 span { color: var(--accent); }
.hero p { color: var(--text2); font-size: 16px; max-width: 500px; margin: 0 auto 32px; line-height: 1.6; }

.stats-bar {
  display: flex; justify-content: center; gap: 48px;
  padding: 24px; background: var(--card);
  border: 1px solid var(--border); border-radius: 12px;
  max-width: 600px; margin: 0 auto;
}
.stat-item { text-align: center; }
.stat-val   { font-size: 22px; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 11px; color: var(--text2); margin-top: 2px; }

/* ───── CODE ───── */
code, .code-block {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 2px 6px;
  font-family: 'Consolas', monospace; font-size: 12px; color: #a78bfa;
}
pre.code-block { padding: 14px; overflow-x: auto; white-space: pre; display: block; color: #a78bfa; margin: 8px 0; }

/* ───── VULN DETAIL ───── */
.code-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
.code-bad  { border-left: 3px solid var(--red); }
.code-good { border-left: 3px solid var(--accent); }
.code-label { font-size: 11px; font-weight: 700; padding: 4px 8px; margin-bottom: 0; }
.code-bad  .code-label { color: var(--red); }
.code-good .code-label { color: var(--accent); }
.cvss-bar { height: 8px; border-radius: 99px; margin: 6px 0; }
.cvss-low      { background: var(--accent); }
.cvss-medium   { background: var(--yellow); }
.cvss-high     { background: #ff6b35; }
.cvss-critical { background: var(--red); }

/* ───── WARN BANNER ───── */
.warn-banner {
  background: rgba(245,158,11,.1);
  border-bottom: 1px solid rgba(245,158,11,.3);
  padding: 8px 24px; text-align: center;
  font-size: 12px; color: var(--yellow);
}

/* ───── AUTH ───── */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.auth-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 40px; width: 100%; max-width: 420px;
}
.auth-logo { text-align: center; font-size: 24px; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
.auth-sub  { text-align: center; color: var(--text2); font-size: 13px; margin-bottom: 32px; }

/* ───── SCROLLBAR ───── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ───── MISC ───── */
.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.hint-list { list-style: none; padding: 0; }
.hint-item { padding: 8px 0; border-bottom: 1px solid rgba(42,58,85,.4); color: var(--text2); font-size: 13px; }
.hint-item::before { content: '💡 '; }

/* ════════════════════════════════
   RESPONSIVE — 768px 이하
   ════════════════════════════════ */
@media (max-width: 768px) {
  /* Nav: 링크 숨기고 햄버거 표시 */
  .nav-links  { display: none; }
  .nav-right  { display: none; }
  .nav-hamburger { display: flex; }
  nav { padding: 0 16px; }

  /* Container */
  .container { padding: 16px; }
  .page-title { font-size: 18px; margin-bottom: 16px; }

  /* Grid → 1열 */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  /* Card */
  .card { padding: 14px; border-radius: 10px; }

  /* Hero */
  .hero { padding: 48px 16px; }
  .hero h1 { font-size: 26px; }
  .hero p  { font-size: 14px; }
  .stats-bar { gap: 24px; padding: 16px; flex-wrap: wrap; }

  /* Table scroll */
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  table { min-width: 500px; }

  /* Auth */
  .auth-card { padding: 24px 20px; }

  /* Toast */
  #toast-container { bottom: 16px; right: 16px; left: 16px; }
  .toast { min-width: unset; max-width: 100%; }

  /* Attack banner */
  .attack-banner { flex-wrap: wrap; gap: 8px; padding: 10px 16px; }

  /* Code compare */
  .code-compare { grid-template-columns: 1fr; }

  /* Warn banner */
  .warn-banner { font-size: 11px; padding: 6px 16px; }

  /* Balance val */
  .balance-val { font-size: 20px; }

  /* Button block on mobile */
  .btn-mobile-block { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 22px; }
  nav { height: 50px; }
  .nav-drawer { top: 50px; }
  .attack-banner { top: 50px; }
}