*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

:root {
  --bg:           #080808;
  --glass:        rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --silver:       #C0C0C0;
  --silver-light: #E8E8E8;
  --silver-dim:   #888;
  --white:        #ffffff;
  --text:         rgba(255,255,255,0.82);
  --text-muted:   rgba(255,255,255,0.42);
  --danger:       #f43f5e;
  --radius:       18px;
  --font:         'Inter', Arial, sans-serif;
  --ease:         cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); overflow-x: hidden; min-height: 100vh; -webkit-font-smoothing: antialiased; }

#particles { position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: 0.45; }

/* ── Header ─────────────────────────────────────────── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: 68px; display: flex; align-items: center;
  padding: 0 clamp(1.25rem,5vw,3rem);
  background: rgba(8,8,8,0.6);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}
.header-inner { width: 100%; max-width: 900px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.logo { text-decoration: none; display: flex; align-items: center; gap: 0.4rem; }
.logo-kenz { font-family: 'Arial Black', Arial, sans-serif; font-weight: 900; font-size: 1.15rem; letter-spacing: 0.15em; background: linear-gradient(135deg, var(--silver-light), var(--silver)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo-sep { color: rgba(255,255,255,0.2); font-size: 1.1rem; }
.logo-sub { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.18em; color: var(--silver-dim); text-transform: uppercase; }

.nav-cta {
  appearance: none; -webkit-appearance: none; border: none; cursor: pointer;
  font-family: inherit;
  background: linear-gradient(135deg, var(--silver-light), var(--silver));
  color: #080808; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em;
  padding: 0.55rem 1.2rem; border-radius: 100px;
  transition: opacity .25s, transform .25s;
}
.nav-cta:hover { opacity: .85; transform: translateY(-1px); }

/* ── App shell ──────────────────────────────────────── */
.app, .auth-shell {
  position: relative; z-index: 1;
  max-width: 900px; margin: 0 auto;
  padding: calc(68px + 2rem) clamp(1.25rem,5vw,2rem) 3rem;
}

.card-title {
  font-size: 1.05rem; font-weight: 600; color: var(--white);
  margin-bottom: 1rem;
}

/* ── Auth screen ────────────────────────────────────── */
.auth-shell { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.auth-card { width: 100%; max-width: 400px; }
.auth-sub { font-size: 0.85rem; color: var(--text-muted); margin: -0.5rem 0 1.1rem; line-height: 1.5; }
.auth-form { display: flex; flex-direction: column; gap: 1rem; }
.auth-form .btn-primary { grid-column: unset; }
.auth-links { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.link-btn {
  appearance: none; -webkit-appearance: none; border: none; background: none; cursor: pointer;
  font-family: inherit; color: var(--silver-dim); font-size: 0.8rem;
  text-decoration: underline; text-underline-offset: 2px;
  padding: 0;
}
.link-btn:hover { color: var(--silver-light); }
.auth-error {
  font-size: 0.82rem; color: var(--danger);
  background: rgba(244,63,94,0.08); border: 1px solid rgba(244,63,94,0.25);
  border-radius: 8px; padding: 0.6rem 0.8rem;
}
#authCode { letter-spacing: 0.4em; text-align: center; font-size: 1.2rem; }

/* ── User bar ───────────────────────────────────────── */
.user-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem;
}
.user-email { font-size: 0.85rem; color: var(--text-muted); }

/* ── Mileage tile ───────────────────────────────────── */
.mileage-tile { text-align: center; margin-bottom: 1rem; padding: 1.75rem 1.5rem; }
.mileage-tile-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.6rem; }
.mileage-tile-value {
  display: flex; align-items: baseline; justify-content: center; gap: 0.5rem;
  font-size: clamp(2.4rem, 8vw, 3.2rem); font-weight: 700;
  background: linear-gradient(135deg, var(--silver-light), var(--silver));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.mileage-tile-unit { font-size: 1rem; color: var(--silver-dim); -webkit-text-fill-color: var(--silver-dim); }

/* ── Stats ──────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  margin-bottom: 1.75rem;
}
.stat-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.1rem 0.9rem;
  text-align: center;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.stat-label { font-size: 0.68rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.4rem; }
.stat-value {
  font-size: clamp(1.3rem, 4vw, 1.7rem); font-weight: 700;
  background: linear-gradient(135deg, var(--silver-light), var(--silver));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-unit { font-size: 0.68rem; color: var(--silver-dim); margin-top: 0.15rem; }

/* ── Glass card ─────────────────────────────────────── */
.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}

.form-card { margin-bottom: 2rem; }

/* ── Form ───────────────────────────────────────────── */
.entry-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem 1rem;
}
.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field label { font-size: 0.78rem; color: var(--text-muted); }
.field input {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  color: var(--white);
  font-family: inherit;
  font-size: 0.92rem;
}
.field input:focus {
  outline: none;
  border-color: var(--silver);
}
.field input::-webkit-calendar-picker-indicator { filter: invert(1); opacity: 0.6; }

.cost-readout {
  background: rgba(255,255,255,0.02);
  border: 1px dashed var(--glass-border);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--silver-light);
}

.checkbox-field {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: 0.55rem;
  font-size: 0.85rem; color: var(--text-muted);
  cursor: pointer;
}
.checkbox-field input { width: 16px; height: 16px; accent-color: var(--silver); }

.btn-primary {
  grid-column: 1 / -1;
  appearance: none; -webkit-appearance: none; border: none; cursor: pointer;
  font-family: inherit;
  background: linear-gradient(135deg, var(--silver-light), var(--silver));
  color: #080808; font-size: 0.92rem; font-weight: 700;
  padding: 0.8rem 1.2rem; border-radius: 12px;
  margin-top: 0.25rem;
  transition: opacity .25s, transform .25s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

/* ── Entries table ──────────────────────────────────── */
.entries-section { margin-bottom: 1rem; }
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  background: var(--glass);
}
.entries-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; white-space: nowrap; }
.entries-table th, .entries-table td { padding: 0.75rem 1rem; text-align: left; }
.entries-table thead th {
  font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted); border-bottom: 1px solid var(--glass-border);
}
.entries-table tbody tr:not(:last-child) td { border-bottom: 1px solid rgba(255,255,255,0.05); }
.entries-table td { color: var(--white); }
.entries-table td.muted { color: var(--text-muted); }
.entry-mileage {
  font-weight: 700;
  background: linear-gradient(135deg, var(--silver-light), var(--silver));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.entry-mileage.na { -webkit-text-fill-color: var(--text-muted); background: none; }
.entry-delete {
  appearance: none; -webkit-appearance: none; border: none; cursor: pointer;
  background: none; color: var(--text-muted);
  font-size: 1.1rem; line-height: 1; padding: 0.35rem;
  transition: color 0.2s;
}
.entry-delete:hover { color: var(--danger); }

.empty-state {
  display: none;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  padding: 2rem 1rem;
}

/* ── Footer ─────────────────────────────────────────── */
.site-footer {
  position: relative; z-index: 1;
  text-align: center;
  padding: 1.5rem 1rem 2.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 640px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .stat-card { padding: 0.85rem 0.5rem; }
  .entry-form { grid-template-columns: 1fr; }
}