:root {
  --red: #C41E3A;
  --blue: #0051BA;
  --green: #009E60;
  --orange: #FF5800;
  --yellow: #FFD500;
  --white: #FFFFFF;
  --dark: #1a1a2e;
  --darker: #16213e;
  --card: #0f3460;
  --card-hover: #1a4a7a;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--dark);
  color: var(--white);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ─── Login ─── */
#login-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  text-align: center;
  padding: 1.5rem;
}

#login-screen h1 {
  font-size: 2.5rem;
  margin-bottom: 0.3rem;
  background: linear-gradient(135deg, var(--red), var(--blue), var(--green), var(--orange), var(--yellow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#login-screen p { color: #888; margin-bottom: 1.5rem; }

/* ─── Login header with manage toggle ─── */
.login-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.btn-manage {
  background: var(--card);
  border: none;
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.2s;
  opacity: 0.5;
}

.btn-manage:hover,
.btn-manage.active {
  opacity: 1;
  background: var(--red);
}

/* ─── Existing user chips ─── */
.existing-users {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.user-chip {
  padding: 0.6rem 1.2rem;
  background: var(--card);
  border: 2px solid var(--card);
  border-radius: 20px;
  color: var(--white);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.user-chip:hover {
  border-color: var(--orange);
  background: var(--card-hover);
  transform: scale(1.05);
}

.user-chip:active {
  transform: scale(0.97);
}

.user-chip .chip-delete {
  display: none;
  font-size: 0.85rem;
  opacity: 0.7;
  padding: 0 0.2rem;
  cursor: pointer;
}

.manage-mode .user-chip .chip-delete {
  display: inline;
}

.manage-mode .user-chip .chip-delete:hover {
  opacity: 1;
  color: var(--red);
}

.login-box {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

.login-box input {
  padding: 0.9rem 1.2rem;
  border: 2px solid var(--card);
  border-radius: 12px;
  background: var(--darker);
  color: var(--white);
  font-size: 1.1rem;
  outline: none;
  min-width: 200px;
}

.login-box input:focus { border-color: var(--orange); }

/* ─── Buttons ─── */
.btn {
  padding: 0.9rem 1.8rem;
  border: none;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
}

.btn:hover { transform: scale(1.04); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: linear-gradient(135deg, var(--orange), var(--red));
  color: var(--white);
}

.btn-secondary {
  background: var(--card);
  color: var(--white);
}

.btn-danger {
  background: var(--red);
  color: var(--white);
}

/* ─── Header ─── */
header {
  background: var(--darker);
  padding: 0.75rem 1rem;
  border-bottom: 3px solid;
  border-image: linear-gradient(to right, var(--red), var(--orange), var(--yellow), var(--green), var(--blue)) 1;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

header h1 { font-size: 1.4rem; }

.user-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

#logout-btn {
  background: var(--card);
  color: var(--white);
  border: none;
  border-radius: 6px;
  padding: 0.3rem 0.55rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}

#logout-btn:hover { background: var(--red); }

nav { display: flex; gap: 0.4rem; }

.nav-btn {
  flex: 1;
  padding: 0.55rem 0.5rem;
  background: transparent;
  border: 2px solid var(--card);
  border-radius: 8px;
  color: #aaa;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
  text-align: center;
}

.nav-btn:hover { border-color: var(--orange); color: var(--white); }

.nav-btn.active {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

/* ─── Tabs ─── */
.tab { display: none; padding: 1.5rem 1rem; max-width: 800px; margin: 0 auto; }
.tab.active { display: block; }

/* ─── Timer ─── */
.timer-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  min-height: 60dvh;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.timer {
  font-size: 5rem;
  font-weight: 700;
  font-family: 'Courier New', 'SF Mono', monospace;
  background: linear-gradient(135deg, var(--yellow), var(--orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: font-size 0.2s;
}

.timer.ready {
  background: linear-gradient(135deg, var(--green), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
}

.timer.running {
  background: linear-gradient(135deg, var(--green), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
}

.timer-hint {
  margin-top: 1.5rem;
  color: #666;
  font-size: 0.9rem;
  text-align: center;
}

/* ─── Last solves (tags) ─── */
.last-solves {
  margin-top: 1.5rem;
  padding: 0 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

.solve-tag {
  padding: 0.4rem 0.7rem;
  background: var(--card);
  border-radius: 6px;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.solve-tag:hover { background: var(--red); }

/* ─── Tables ─── */
h2 {
  margin: 1.5rem 0 0.75rem;
  color: var(--yellow);
  font-size: 1.15rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 300px;
}

th, td {
  padding: 0.7rem 0.5rem;
  text-align: left;
  border-bottom: 1px solid rgba(15, 52, 96, 0.5);
  font-size: 0.95rem;
}

th {
  background: var(--darker);
  color: var(--orange);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 0;
}

tr:hover { background: rgba(255, 88, 0, 0.08); }

tr:nth-child(1) td:first-child { color: var(--yellow); font-weight: bold; }
tr:nth-child(2) td:first-child { color: #C0C0C0; }
tr:nth-child(3) td:first-child { color: #CD7F32; }

/* ─── Stats ─── */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--card);
  padding: 0.9rem;
  border-radius: 10px;
  text-align: center;
  border-top: 3px solid var(--blue);
}

.stat-card .label { font-size: 0.7rem; color: #888; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-card .value { font-size: 1.4rem; font-weight: 700; margin-top: 0.2rem; }

/* ─── Delete button in tables ─── */
.btn-delete {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0.4;
  transition: opacity 0.2s;
  padding: 0.2rem;
}

.btn-delete:hover { opacity: 1; }

/* ─── Modal ─── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1.5rem;
  backdrop-filter: blur(4px);
}

.modal-content {
  background: var(--darker);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  max-width: 320px;
  width: 100%;
  border: 2px solid var(--card);
}

.modal-content p { font-size: 1.1rem; margin-bottom: 1.5rem; }

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.modal-actions .btn { flex: 1; padding: 0.7rem; font-size: 0.95rem; }

/* ─── Utility ─── */
.hidden { display: none !important; }

/* ─── Desktop ─── */
@media (min-width: 600px) {
  .timer { font-size: 8rem; }
  #login-screen h1 { font-size: 3.5rem; }
  .timer-area { min-height: 70vh; }
  .stats { gap: 1.5rem; }
  .stat-card { padding: 1.2rem 1.5rem; }
  .stat-card .value { font-size: 1.8rem; }
  th, td { padding: 0.8rem; }
}