:root {
  --bg: #f5f6fb;
  --panel: #ffffff;
  --line: #e4e7f0;
  --text: #1f2430;
  --muted: #687082;
  --primary: #5b5ce2;
  --primary-dark: #4445c7;
  --soft: #eef0ff;
  --success: #e8f8ef;
  --success-text: #1b7f4b;
  --error: #fff0f0;
  --error-text: #be3131;
  --shadow: 0 14px 38px rgba(29, 34, 63, 0.08);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Pretendard, sans-serif; background: linear-gradient(180deg, #f8f9ff 0%, var(--bg) 100%); color: var(--text); }
a { color: inherit; text-decoration: none; }
.app-shell { max-width: 1180px; margin: 0 auto; padding: 28px 20px 48px; }
.topbar { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 24px; }
.topbar h1 { margin: 0; font-size: 32px; }
.subtitle { margin: 8px 0 0; color: var(--muted); }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.center-panel { min-height: 240px; display: grid; place-items: center; }
.auth-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 20px; }
.hero-panel, .form-panel, .welcome-panel { padding: 28px; }
.badge, .eyebrow { display: inline-block; padding: 6px 10px; border-radius: 999px; background: var(--soft); color: var(--primary); font-size: 12px; font-weight: 700; }
.hero-panel h2, .welcome-panel h2 { margin: 16px 0 10px; font-size: 28px; line-height: 1.3; }
.hero-panel p, .muted { color: var(--muted); }
.feature-list { margin: 20px 0 0; padding-left: 18px; color: var(--muted); }
.tab-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 18px; }
.tab-btn, button, .link-btn { font: inherit; cursor: pointer; }
.tab-btn { border: 0; border-radius: 14px; padding: 12px 16px; background: #f1f3f9; color: var(--muted); font-weight: 700; }
.tab-btn.active { background: var(--primary); color: #fff; }
label { display: block; margin-bottom: 14px; font-weight: 600; }
input, select { width: 100%; margin-top: 8px; padding: 13px 14px; border: 1px solid var(--line); border-radius: 14px; outline: none; background: #fff; font: inherit; }
input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(91, 92, 226, 0.12); }
.primary, .secondary, .ghost { border: 0; border-radius: 14px; padding: 13px 16px; font-weight: 700; }
.primary { width: 100%; background: var(--primary); color: #fff; }
.primary:hover { background: var(--primary-dark); }
.secondary { background: #f1f3f9; color: var(--text); }
.ghost { background: transparent; border: 1px solid var(--line); }
.help-text { margin: 2px 0 14px; color: var(--muted); font-size: 14px; }
.status { margin-bottom: 16px; padding: 12px 14px; border-radius: 14px; font-size: 14px; font-weight: 600; }
.status.success { background: var(--success); color: var(--success-text); }
.status.error { background: var(--error); color: var(--error-text); }
.welcome-panel { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.hero-dashboard { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 20px; }
.metric-panel { padding: 22px; }
.metric-panel span, .metric-panel small { display: block; color: var(--muted); }
.metric-panel strong { display: block; margin: 12px 0; font-size: 28px; }
.metric-panel.accent { background: #efe9ff; }
.metric-panel.accent2 { background: #fff1ef; }
.metric-panel.accent3 { background: #eefaf3; }
.menu-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 18px; margin-bottom: 20px; }
.menu-card { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 22px; box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.menu-card:hover { transform: translateY(-3px); border-color: rgba(91, 92, 226, .35); box-shadow: 0 18px 36px rgba(29, 34, 63, .12); }
.menu-card strong { display: block; margin: 16px 0 8px; font-size: 18px; }
.menu-card small { color: var(--muted); line-height: 1.5; display: block; }
.menu-emoji { display: inline-grid; place-items: center; width: 52px; height: 52px; border-radius: 16px; background: var(--soft); font-size: 28px; }
.month-panel { padding: 24px; }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; margin-bottom: 16px; }
.section-head h3 { margin: 8px 0 0; }
.usage-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 12px; }
.usage-day-card { border: 1px solid var(--line); border-radius: 18px; padding: 14px; min-height: 120px; display: flex; flex-direction: column; gap: 6px; background: #fafbff; }
.usage-date { font-size: 13px; color: var(--muted); }
.hidden { display: none !important; }
@media (max-width: 1100px) { .menu-grid { grid-template-columns: repeat(3, 1fr); } .hero-dashboard { grid-template-columns: repeat(2, 1fr); } .usage-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 900px) { .auth-grid, .menu-grid, .hero-dashboard { grid-template-columns: 1fr; } .welcome-panel, .section-head { flex-direction: column; align-items: flex-start; } .usage-grid { grid-template-columns: repeat(2, 1fr); } }