* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Arial, sans-serif;
  background: #0d0f11;
  color: #f4f5f6;
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 250px 1fr;
}

.sidebar {
  background: #131619;
  border-right: 1px solid #252a2f;
  padding: 92px 20px 26px;
  display: flex;
  flex-direction: column;
  gap: 34px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: #d9ff42;
  color: #101214;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 900;
}

.brand-title {
  font-weight: 900;
  letter-spacing: 0.14em;
}

.brand-subtitle {
  font-size: 11px;
  color: #929aa2;
  letter-spacing: 0.22em;
  margin-top: 2px;
}

.sidebar nav {
  display: grid;
  gap: 7px;
}

.nav-item {
  border: 0;
  background: transparent;
  color: #9ca4ab;
  text-align: left;
  padding: 13px 14px;
  border-radius: 10px;
  font-size: 15px;
  cursor: pointer;
}

.nav-item:hover,
.nav-item.active {
  background: #20252a;
  color: white;
}

.profile-card {
  margin-top: auto;
  border-top: 1px solid #282d32;
  padding-top: 18px;
  display: flex;
  gap: 11px;
  align-items: center;
}

.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #252b31;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.profile-card strong,
.profile-card span {
  display: block;
}

.profile-card span {
  font-size: 12px;
  color: #8f979f;
  margin-top: 3px;
}

.main {
  padding: 100px 42px 60px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
}

.eyebrow {
  margin: 0 0 7px;
  color: #9ea6ad;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.topbar h1 {
  margin: 0;
  font-size: 30px;
}

.primary,
.secondary,
.text-btn,
.icon-btn {
  cursor: pointer;
  font: inherit;
}

.primary {
  border: 0;
  background: #d9ff42;
  color: #111;
  padding: 12px 16px;
  border-radius: 10px;
  font-weight: 800;
}

.secondary {
  border: 1px solid #353b41;
  background: #1a1e22;
  color: white;
  padding: 11px 15px;
  border-radius: 10px;
}

.text-btn {
  border: 0;
  background: transparent;
  color: #d9ff42;
  font-weight: 700;
}

.icon-btn {
  border: 0;
  background: transparent;
  color: #c8cdd1;
  font-size: 28px;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.hero {
  border: 1px solid #2a3035;
  background: linear-gradient(120deg, #181c20, #111416);
  padding: 28px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero h2 {
  font-size: 30px;
  margin: 0 0 8px;
}

.muted {
  color: #929ba3;
  margin: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 16px 0;
}

.stats article {
  background: #15191c;
  border: 1px solid #282e33;
  border-radius: 14px;
  padding: 20px;
}

.stats span {
  display: block;
  color: #89929a;
  font-size: 13px;
}

.stats strong {
  display: block;
  font-size: 28px;
  margin-top: 8px;
}

.two-col {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 16px;
}

.panel {
  background: #15191c;
  border: 1px solid #282e33;
  border-radius: 16px;
  padding: 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.panel h2,
.panel h3 {
  margin: 0;
}

.session-list,
.diary-list,
.schedule-list,
.connection-list,
.shared-list,
.diary-full {
  display: grid;
  gap: 10px;
}

.session-row,
.diary-row,
.connection-row,
.shared-row,
.schedule-row {
  background: #101315;
  border: 1px solid #242a2f;
  border-radius: 12px;
  padding: 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.session-row strong,
.diary-row strong,
.schedule-row strong,
.connection-row strong,
.shared-row strong {
  display: block;
}

.meta {
  font-size: 12px;
  color: #8e979f;
  margin-top: 4px;
}

.badge {
  font-size: 11px;
  background: #242a2f;
  color: #c4cbd0;
  padding: 6px 8px;
  border-radius: 999px;
}

.badge.green {
  background: #243012;
  color: #d9ff42;
}

.schedule-row .actions,
.connection-row .actions {
  display: flex;
  gap: 8px;
}

.small-btn {
  border: 1px solid #333a40;
  background: #191d21;
  color: #d8dde1;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
}

.small-btn.accent {
  border-color: #48551a;
  color: #d9ff42;
}

.diary-full .diary-row {
  align-items: flex-start;
}

.diary-notes {
  color: #aab1b7;
  font-size: 13px;
  margin-top: 8px;
  line-height: 1.5;
}

dialog {
  width: min(800px, 92vw);
  border: 1px solid #343b41;
  border-radius: 18px;
  background: #15191c;
  color: white;
  padding: 0;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.72);
}

#sessionForm {
  padding: 24px;
}

.dialog-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.dialog-head h2 {
  margin: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.form-grid label,
.exercise-card label {
  display: grid;
  gap: 7px;
  color: #aeb5bb;
  font-size: 12px;
}

.form-grid input,
.exercise-card input,
.exercise-card select,
.exercise-card textarea {
  width: 100%;
  background: #0f1214;
  color: white;
  border: 1px solid #30373d;
  border-radius: 9px;
  padding: 11px;
}

.unit-input {
  position: relative;
}

.unit-input span {
  position: absolute;
  right: 11px;
  top: 11px;
  color: #777f86;
  font-size: 12px;
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin: 26px 0 12px;
}

.section-title h3 {
  margin: 0;
}

.exercise-card {
  border: 1px solid #2b3237;
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 10px;
}

.exercise-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 10px;
}

.exercise-card textarea {
  margin-top: 10px;
  min-height: 65px;
  resize: vertical;
}

.exercise-card .remove {
  margin-top: 10px;
  background: none;
  border: 0;
  color: #ff8b8b;
  cursor: pointer;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 22px;
}

.timer-card {
  padding: 35px;
  text-align: center;
}

.timer-display {
  font-size: 70px;
  font-weight: 900;
  letter-spacing: -0.04em;
  margin: 30px 0;
}

.timer-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
}

@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    height: auto;
    position: static;
    border-right: 0;
    border-bottom: 1px solid #252a2f;
    padding: 18px;
  }

  .sidebar nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .profile-card {
    display: none;
  }

  .main {
    padding: 24px 18px;
  }

  .stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .two-col {
    grid-template-columns: 1fr;
  }

  .topbar {
    align-items: flex-start;
  }

  .form-grid,
  .exercise-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .sidebar nav {
    grid-template-columns: 1fr 1fr;
  }

  .topbar,
  .hero {
    align-items: flex-start;
    flex-direction: column;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
  }

  .form-grid,
  .exercise-grid {
    grid-template-columns: 1fr;
  }

  .main {
    padding: 20px 12px;
  }

  .panel {
    padding: 16px;
  }

  .topbar h1,
  .hero h2 {
    font-size: 24px;
  }
}