/* ============================================================
   FitLog — 운동/식단 관리 앱 스타일
   컨셉: 에너제틱 다크 + 라임 그린 액센트 (헬스/피트니스 톤)
   ============================================================ */

/* ---------- Design tokens ---------- */
:root,
[data-theme='light'] {
  --color-bg: #f6f7f4;
  --color-surface: #ffffff;
  --color-surface-2: #fbfbf9;
  --color-surface-offset: #eef0ea;
  --color-divider: #e0e3db;
  --color-border: #d6dacf;

  --color-text: #141710;
  --color-text-muted: #63685c;
  --color-text-faint: #a2a698;
  --color-text-inverse: #0d0f0a;

  --color-primary: #5fd131;
  --color-primary-strong: #3fae18;
  --color-primary-soft: #e4f8d8;
  --color-primary-text-on: #0d1a04;

  --color-danger: #e0483f;
  --color-danger-soft: #fbe4e2;
  --color-warning: #d98c1f;

  --shadow-sm: 0 1px 2px rgba(20, 23, 16, 0.06);
  --shadow-md: 0 6px 20px rgba(20, 23, 16, 0.08);
  --shadow-lg: 0 16px 40px rgba(20, 23, 16, 0.12);
}

[data-theme='dark'] {
  --color-bg: #0c0e0a;
  --color-surface: #14170f;
  --color-surface-2: #191d13;
  --color-surface-offset: #1e2317;
  --color-divider: #2a301f;
  --color-border: #333a26;

  --color-text: #eef2e6;
  --color-text-muted: #9ba38b;
  --color-text-faint: #666e58;
  --color-text-inverse: #0d0f0a;

  --color-primary: #8fef4c;
  --color-primary-strong: #a6ff6b;
  --color-primary-soft: #23301a;
  --color-primary-text-on: #0d1a04;

  --color-danger: #ff6b60;
  --color-danger-soft: #2c1613;
  --color-warning: #f0a93d;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.5);
}

:root {
  --font-display: 'Space Grotesk', 'Manrope', system-ui, sans-serif;
  --font-body: 'Manrope', system-ui, sans-serif;

  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --text-sm: clamp(0.8125rem, 0.78rem + 0.2vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);
  --text-lg: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  --text-xl: clamp(1.375rem, 1.2rem + 0.9vw, 1.75rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 999px;

  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html { color-scheme: light dark; }
[data-theme='dark'] { color-scheme: dark; }
[data-theme='light'] { color-scheme: light; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s var(--ease-standard), color 0.2s var(--ease-standard);
}

h1, h2, h3 { font-family: var(--font-display); margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
button { font-family: inherit; }

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.brand-logo { width: 26px; height: 26px; color: var(--color-primary); }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.main-nav {
  display: flex;
  gap: var(--space-1);
  margin-left: var(--space-4);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s var(--ease-standard), color 0.15s var(--ease-standard);
  white-space: nowrap;
}
.nav-item svg { width: 17px; height: 17px; flex-shrink: 0; }
.nav-item:hover { background: var(--color-surface-offset); color: var(--color-text); }
.nav-item[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.conn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-faint);
  flex-shrink: 0;
  transition: background 0.2s;
}
.conn-dot.online { background: var(--color-primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent); }
.conn-dot.offline { background: var(--color-danger); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.15s var(--ease-standard), transform 0.1s var(--ease-standard);
}
.icon-btn svg { width: 17px; height: 17px; }
.icon-btn:hover { background: var(--color-surface-offset); }
.icon-btn:active { transform: scale(0.94); }

.icon-moon { display: none; }
[data-theme='dark'] .icon-sun { display: none; }
[data-theme='dark'] .icon-moon { display: inline-flex; }

.nav-toggle { display: none; }

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--space-2) var(--space-5) var(--space-4);
  gap: var(--space-1);
}
.mobile-nav .nav-item { justify-content: flex-start; width: 100%; }

/* ---------- Layout ---------- */
.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-5) var(--space-16);
}

.view-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.view-title { font-size: var(--text-xl); font-weight: 700; }
.view-sub { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-1); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 700;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.1s var(--ease-standard), background 0.15s var(--ease-standard), opacity 0.15s;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-text-on);
}
.btn-primary:hover { background: var(--color-primary-strong); }

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { background: var(--color-surface-offset); }

.btn-danger-ghost {
  background: transparent;
  border: none;
  color: var(--color-text-faint);
  padding: var(--space-1);
}
.btn-danger-ghost:hover { color: var(--color-danger); }

.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }

/* ---------- Stat cards ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  box-shadow: var(--shadow-sm);
}
.stat-label { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; }
.stat-unit { font-size: var(--text-xs); color: var(--color-text-faint); }

/* ---------- Cards / Tables ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.table-card { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  min-width: 640px;
}
.data-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--color-divider);
  white-space: nowrap;
}
.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  white-space: nowrap;
}
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: var(--color-surface-offset); }
.data-table td.wrap { white-space: normal; min-width: 180px; }

.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-5);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ---------- Session list (workout) ---------- */
.session-list { display: flex; flex-direction: column; gap: var(--space-4); }

.session-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.session-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.session-title-group { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.session-date { font-family: var(--font-display); font-weight: 700; font-size: var(--text-lg); }
.session-badge {
  background: var(--color-primary-soft);
  color: var(--color-primary-strong);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
}
.session-memo { font-size: var(--text-xs); color: var(--color-text-faint); }

.session-actions { display: flex; gap: var(--space-2); }

.set-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.set-table th {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-divider);
}
.set-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}
.set-table tbody tr:last-child td { border-bottom: none; }

.session-empty-sets {
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-faint);
  font-size: var(--text-xs);
}

/* ---------- Rules board ---------- */
.rules-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-4);
}

.rule-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  box-shadow: var(--shadow-sm);
  position: relative;
}
.rule-cat {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary-strong);
  background: var(--color-primary-soft);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  width: fit-content;
}
.rule-title { font-weight: 700; font-size: var(--text-base); }
.rule-detail { color: var(--color-text-muted); font-size: var(--text-sm); white-space: pre-wrap; }
.rule-delete {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
}

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(5, 6, 3, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  z-index: 100;
  backdrop-filter: blur(4px);
}
.modal-backdrop[hidden] { display: none; }

.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modal-in 0.18s var(--ease-standard);
}

@keyframes modal-in {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-5) var(--space-3);
}
.modal-header h2 { font-size: var(--text-lg); font-weight: 700; }

.modal-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: 0 var(--space-5) var(--space-5);
}

.modal-form label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}

.form-row { display: flex; flex-direction: column; gap: var(--space-4); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); }
.form-grid-3 { grid-template-columns: repeat(3, 1fr); }
.form-grid-4 { grid-template-columns: repeat(2, 1fr); }

input, select, textarea {
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  outline: none;
  transition: border-color 0.15s var(--ease-standard);
  width: 100%;
}
input:focus, select:focus, textarea:focus { border-color: var(--color-primary); }
textarea { resize: vertical; min-height: 60px; font-family: inherit; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: var(--space-6);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  animation: toast-in 0.2s var(--ease-standard);
}
.toast[hidden] { display: none; }
.toast.error { background: var(--color-danger); color: #fff; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ---------- Auth (login / signup) ---------- */
.auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  background: var(--color-bg);
}
.auth-screen[hidden] { display: none; }

.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.auth-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  color: var(--color-text);
}
.auth-brand .brand-logo { width: 30px; height: 30px; color: var(--color-primary); }
.auth-brand .brand-name { font-family: var(--font-display); font-weight: 700; font-size: var(--text-xl); letter-spacing: -0.02em; }

.auth-tabs {
  display: flex;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 4px;
  gap: 4px;
}
.auth-tab {
  flex: 1;
  background: transparent;
  border: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background 0.15s var(--ease-standard), color 0.15s var(--ease-standard);
}
.auth-tab[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-text-on);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.auth-form[hidden] { display: none; }
.auth-form label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}
.auth-submit { width: 100%; justify-content: center; margin-top: var(--space-1); }

.auth-error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  background: var(--color-danger-soft);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  margin: 0;
}
.auth-error[hidden] { display: none; }

.current-user {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .mobile-nav { display: none; border-top: 1px solid var(--color-divider); }
  .mobile-nav.open { display: flex; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid, .form-grid-3, .form-grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .view-header { align-items: flex-start; }
  .btn span, .btn { font-size: var(--text-xs); }
  .form-grid-3 { grid-template-columns: 1fr 1fr; }
  .current-user { display: none; }
  .auth-card { padding: var(--space-6) var(--space-4); }
}