:root {
  color-scheme: dark;
  --bg: #06070b;
  --surface: rgba(255,255,255,0.06);
  --surface-strong: #11151d;
  --border: rgba(255,255,255,0.12);
  --text: #f5f7fb;
  --muted: #94a3b8;
  --accent: #39ff14;
  --accent-2: #00f0ff;
  --danger: #ff4d67;
  --shadow: 0 20px 50px rgba(0,0,0,0.35);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top left, rgba(0,240,255,0.16), transparent 30%), var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a { color: inherit; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #04110a;
  padding: 0.75rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: 1rem; top: 1rem; }
.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}
.sidebar {
  background: rgba(8, 11, 18, 0.95);
  border-right: 1px solid var(--border);
  padding: 2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.brand-block {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.35rem 0.2rem 0.7rem;
}
.brand-image {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  object-fit: cover;
  border: 2px solid rgba(255,255,255,0.18);
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.brand-title {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.brand-title h1 {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: 0.02em;
}
.brand-title .eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  margin-bottom: 0.15rem;
}
.eyebrow {
  margin: 0 0 0.2rem;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.74rem;
  color: var(--muted);
}
.nav-list {
  display: grid;
  gap: 0.5rem;
}
.nav-item {
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 0.9rem 1rem;
  text-align: left;
  background: transparent;
  color: var(--text);
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.nav-item:hover, .nav-item:focus-visible {
  transform: translateX(2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}
.nav-item.active, .nav-item:hover {
  background: rgba(57,255,20,0.12);
  border-color: rgba(57,255,20,0.3);
}
.sidebar-card, .hero-card, .panel-card, .stat-card, .modal-card {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.sidebar-card:hover, .hero-card:hover, .panel-card:hover, .stat-card:hover, .modal-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255,255,255,0.2);
  box-shadow: 0 16px 32px rgba(0,0,0,0.24);
}
.sidebar-card, .hero-card, .panel-card, .stat-card { padding: 1.1rem; }
.main-content { padding: 2rem; display: flex; flex-direction: column; gap: 1.25rem; }
.view-panel {
  display: none;
  animation: viewFade 220ms ease-out;
}
.view-panel.active {
  display: block;
}
.topbar, .panel-heading { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.primary-btn, .ghost-btn {
  border-radius: 999px;
  padding: 0.8rem 1.1rem;
  border: none;
  transition: transform 180ms ease, box-shadow 180ms ease, filter 180ms ease;
}
.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04110a;
  font-weight: 700;
}
.ghost-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.primary-btn:hover, .ghost-btn:hover, .primary-btn:focus-visible, .ghost-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  filter: brightness(1.04);
}
.primary-btn:active, .ghost-btn:active {
  transform: translateY(1px) scale(0.98);
  box-shadow: 0 4px 10px rgba(0,0,0,0.18);
}
.hero-card { display: flex; justify-content: space-between; gap: 1.25rem; align-items: center; }
.premium-hero {
  padding: 1.4rem 1.4rem 1.4rem 1.5rem;
  background: linear-gradient(135deg, rgba(57,255,20,0.18), rgba(0,240,255,0.16));
  border: 1px solid rgba(255,255,255,0.16);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255,255,255,0.08);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  position: relative;
  overflow: hidden;
  animation: heroGlow 8s ease-in-out infinite alternate;
}
.premium-hero::after {
  content: '';
  position: absolute;
  inset: auto -30px -40px auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  filter: blur(2px);
}
.hero-copy {
  max-width: 680px;
  display: grid;
  gap: 0.65rem;
}
.hero-copy h3 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 1.75rem);
  line-height: 1.15;
}
.hero-copy p {
  margin: 0;
  color: #dfe7f2;
  max-width: 62ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.35rem;
}
.hero-badge {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem 0.95rem;
  border-radius: 999px;
  background: rgba(6,7,11,0.72);
  border: 1px solid rgba(255,255,255,0.12);
  min-width: 190px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.hero-badge:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.25);
}
.hero-logo {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  object-fit: cover;
  border: 2px solid rgba(255,255,255,0.16);
}
.hero-badge strong {
  display: block;
  font-size: 1rem;
}
.hero-badge span {
  color: var(--muted);
  font-size: 0.9rem;
}
.stats-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.stat-card strong { display: block; font-size: 1.7rem; margin-top: 0.35rem; }
.panel-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 1rem; }
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.routine-card {
  padding: 1rem;
  border-radius: 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.routine-card:hover {
  transform: translateY(-3px);
  border-color: rgba(57,255,20,0.35);
  box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}
.week-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.8rem;
  margin-top: 0.75rem;
}
.week-pill {
  padding: 0.8rem;
  border-radius: 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
}
.training-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.auth-form {
  display: grid;
  gap: 0.6rem;
}
.auth-form input {
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  padding: 0.7rem 0.8rem;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.45rem;
  margin-top: 0.8rem;
}
.calendar-day {
  min-height: 66px;
  border-radius: 14px;
  padding: 0.45rem;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.calendar-day.active {
  border-color: rgba(57,255,20,0.45);
  background: rgba(57,255,20,0.12);
}
.progress-chart {
  width: 100%;
  height: auto;
  margin-top: 0.8rem;
}
.stack-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.8rem; }
.stack-list li, .table-card { padding: 0.8rem 0.95rem; border-radius: 14px; background: rgba(255,255,255,0.03); }
.table-card { overflow: hidden; }
.modal {
  position: fixed;
  inset: 0;
  background: rgba(3,7,15,0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}
.modal.active {
  opacity: 1;
  pointer-events: auto;
}
.modal-card {
  width: min(700px, 100%);
  padding: 1.25rem;
  transform: translateY(16px) scale(0.98);
  transition: transform 220ms ease, opacity 220ms ease;
  opacity: 0;
}
.modal.active .modal-card {
  transform: translateY(0) scale(1);
  opacity: 1;
}
.stack-form { display: grid; gap: 1rem; margin-top: 1rem; }
.field { display: grid; gap: 0.45rem; position: relative; }
.field input, .field textarea {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.8rem 0.95rem;
  background: rgba(255,255,255,0.04);
  color: var(--text);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}
.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: flex-end;
}
.sidebar-card h3 {
  margin: 0.25rem 0 0.4rem;
  font-size: 1rem;
}
.file-picker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.field-help {
  margin: 0;
  font-size: 0.86rem;
  color: var(--muted);
  transition: color 180ms ease, transform 180ms ease;
}
.field-help.is-ready {
  color: #8dff7b;
  transform: translateY(-1px);
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: rgba(0,240,255,0.75);
  box-shadow: 0 0 0 3px rgba(0,240,255,0.16);
  transform: translateY(-1px);
}
.field.is-valid input, .field.is-valid textarea {
  border-color: rgba(57,255,20,0.7);
  box-shadow: 0 0 0 2px rgba(57,255,20,0.16);
  transform: translateY(-1px);
}
.field.is-valid .field-help {
  color: #8dff7b;
}
.field.is-valid::after {
  content: '✓';
  position: absolute;
  right: 0.9rem;
  top: 0.82rem;
  color: #6dff58;
  font-weight: 700;
  text-shadow: 0 0 12px rgba(57,255,20,0.3);
  animation: checkPop 220ms ease-out;
}
.field textarea { resize: vertical; min-height: 130px; }
.text-link { text-decoration: underline; color: var(--accent-2); }
.empty-state { color: var(--muted); padding: 1rem 0; }

@keyframes heroGlow {
  from {
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255,255,255,0.08);
  }
  to {
    box-shadow: 0 24px 54px rgba(0, 0, 0, 0.34), inset 0 1px 0 rgba(255,255,255,0.1);
  }
}

@keyframes viewFade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes checkPop {
  0% {
    opacity: 0;
    transform: scale(0.7);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
  .panel-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .main-content { padding: 1rem; }
  .premium-hero { flex-direction: column; align-items: flex-start; }
  .hero-badge { margin-top: 0.25rem; }
}