:root {
  --bg: #f3f4f6;
  --panel: #ffffff;
  --line: #d9dee7;
  --line-strong: #c8d0dc;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --warning: #b45309;
  --danger: #b91c1c;
  --success: #15803d;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(37, 99, 235, 0.08), transparent 28%),
    linear-gradient(180deg, #f7faff, var(--bg) 18%);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
  border: 0;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.75rem 0.85rem;
  background: #fff;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

textarea {
  resize: vertical;
}

label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

#pageShell {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
}

#heroText,
.panel-head p,
#routeText,
.muted-text,
.feedback-text,
.entry-card p,
.dashboard-card p,
.auth-link-row {
  color: var(--muted);
}

#mainLayout,
#appShell {
  display: grid;
  gap: 1rem;
}

.landing-layout {
  gap: 1.25rem;
}

.auth-panel {
  max-width: 560px;
  margin: 0 auto;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.landing-header {
  position: sticky;
  top: 1rem;
  z-index: 2;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 252, 0.98)),
    var(--panel);
  backdrop-filter: blur(8px);
}

#siteHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  border-color: #d6e2f7;
  background:
    linear-gradient(135deg, rgba(239, 245, 255, 0.96), rgba(255, 255, 255, 0.98)),
    var(--panel);
}

.brand-block {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  min-width: 0;
}

.brand-link {
  color: inherit;
  text-decoration: none;
}

.brand-copy {
  min-width: 0;
}

.brand-logo {
  width: 52px;
  height: 52px;
  object-fit: contain;
  border-radius: 14px;
  flex: 0 0 auto;
  background: #fff;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.14);
}

.brand-name {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.brand-subtitle {
  margin: 0.15rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.landing-header .brand-block {
  gap: 1rem;
}

.landing-header .brand-copy {
  display: grid;
  gap: 0.2rem;
}

.landing-header .brand-logo {
  width: 68px;
  height: 68px;
  padding: 0.2rem;
  border-radius: 18px;
}

.landing-header .brand-name {
  line-height: 1.15;
}

.top-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.55rem 0.8rem;
  color: var(--text);
  background: #fff;
  text-decoration: none;
  font-weight: 600;
}

.nav-link:hover {
  background: #f8fafc;
}

.nav-link-active {
  border-color: var(--line-strong);
  background: #eef4ff;
  color: var(--accent-dark);
}

.section-heading {
  display: grid;
  gap: 0.2rem;
}

.page-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.landing-kicker {
  margin: 0 0 0.6rem;
  color: var(--accent-dark);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.landing-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  max-width: 12ch;
}

.landing-lead {
  margin: 0;
  font-size: 1.02rem;
  color: var(--muted);
  max-width: 68ch;
}

.page-text {
  margin: 0;
  color: var(--muted);
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.panel-actions,
.inline-actions,
.device-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.panel-head h2,
.entry-card h3,
.dashboard-card h3 {
  margin: 0;
}

.panel-head h2 {
  font-size: 1.15rem;
}

.tab-button,
.ghost-button,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0.7rem 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tab-button,
.ghost-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
}

.primary-button {
  background: var(--accent);
  color: #fff;
}

.primary-button:hover {
  background: var(--accent-dark);
}

.secondary-button {
  background: #eef4ff;
  color: var(--accent-dark);
  border: 1px solid #cfe0ff;
}

.secondary-button:hover {
  background: #e3edff;
}

.ghost-button:hover,
.tab-button:hover {
  background: #f8fafc;
}

.app-topbar .ghost-button {
  border-color: #bfd3fb;
  background: rgba(255, 255, 255, 0.88);
}

.app-topbar .ghost-button:hover {
  background: #eff5ff;
}

.compact-button {
  padding: 0.55rem 0.8rem;
  font-size: 0.92rem;
}

.auth-form,
#logForm {
  display: grid;
  gap: 0.85rem;
}

#deviceForm {
  display: grid;
  gap: 0.85rem;
}

.hidden {
  display: none !important;
}

#topBar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
}

.app-topbar {
  border-color: #cfe0ff;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(255, 255, 255, 0.96) 28%),
    var(--panel);
}

.topbar-heading {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  min-width: 0;
}

.topbar-logo {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.12);
  padding: 0.2rem;
  flex: 0 0 auto;
}

.landing-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(240px, 0.8fr);
  gap: 1rem;
  align-items: stretch;
  padding: 1.5rem;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.1), transparent 32%),
    linear-gradient(180deg, #ffffff, #f7f9fc);
}

.landing-hero-copy {
  display: grid;
  gap: 1rem;
}

.landing-hero-logo {
  width: min(100%, 320px);
  max-height: 320px;
  justify-self: center;
  align-self: center;
  object-fit: contain;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 36px rgba(37, 99, 235, 0.16);
  padding: 0.6rem;
}

.hero-sidecard {
  display: grid;
  align-content: start;
  gap: 0.9rem;
  padding: 1rem;
  border: 1px solid #dbe4f0;
  border-radius: 14px;
  background: linear-gradient(180deg, #eef4ff, #ffffff);
}

.hero-sidecard-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.hero-sidecard-text {
  margin: 0;
  color: var(--text);
  font-weight: 600;
}

.landing-login-link {
  padding: 0.45rem 0.75rem;
  font-size: 0.92rem;
  border-color: #bfd3fb;
  color: var(--accent-dark);
  background: rgba(255, 255, 255, 0.9);
}

.landing-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.landing-feature-card,
.landing-service-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
}

.landing-feature-card {
  padding: 1rem;
}

.landing-feature-card h3,
.landing-service-item h3 {
  margin: 0 0 0.55rem;
}

.landing-feature-card p,
.landing-service-item p,
.landing-cta-text {
  margin: 0;
  color: var(--muted);
}

.landing-service-list {
  display: grid;
  gap: 0.9rem;
}

.landing-service-item {
  padding: 1rem 1rem 1rem 1.15rem;
  border-left: 4px solid #cfe0ff;
}

.landing-cta {
  display: grid;
  gap: 1rem;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(255, 255, 255, 1) 38%),
    #fff;
}

.landing-contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  color: var(--text);
  font-weight: 600;
}

.dashboard-grid,
.entries-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.dashboard-card,
.entry-card {
  padding: 1rem;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--line);
  min-height: 100%;
}

.empty-card {
  display: grid;
  place-items: center;
  text-align: center;
  min-height: 180px;
}

.card-topline {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

.status-chip,
.serial-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.serial-chip {
  background: #f3f4f6;
  color: var(--text);
}

.success-chip {
  background: #eaf7ef;
  color: var(--success);
}

.warning-chip {
  background: #fff4e5;
  color: var(--warning);
}

.danger-chip {
  background: #fdecec;
  color: var(--danger);
}

.countdown-box {
  margin: 1rem 0 0.75rem;
  padding: 0.85rem 0.95rem;
  border-radius: 8px;
  background: #f8fafc;
  border: 1px solid var(--line);
  font-size: 1rem;
  font-weight: 700;
}

.form-grid,
#entryControls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

#entryControls {
  margin-bottom: 0.75rem;
}

.field-wrap {
  display: grid;
  gap: 0.45rem;
}

.readonly-input {
  background: #f8fafc;
  color: var(--muted);
}

.field-wide {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.feedback-text {
  min-height: 1.25rem;
  margin: 0;
}

.feedback-success {
  color: var(--success);
}

.feedback-error {
  color: var(--danger);
}

.file-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.summary-card {
  padding: 0.95rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--text);
  line-height: 1.6;
}

.device-card {
  display: grid;
}

.device-actions {
  margin-top: 1rem;
}

.modal-open {
  overflow: hidden;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(15, 23, 42, 0.52);
}

.modal-panel {
  width: min(760px, 100%);
  max-height: calc(100vh - 2rem);
  overflow: auto;
  border: 1px solid #d6e2f7;
  border-radius: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 250, 252, 0.98)),
    #fff;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.24);
  padding: 1.25rem;
}

.modal-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.modal-close {
  flex: 0 0 auto;
}

.file-link {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #f8fafc;
  color: var(--accent-dark);
  text-decoration: none;
}

.file-link:hover {
  background: #eef4ff;
  border-color: #cfe0ff;
}

.auth-link-row {
  margin: 0.4rem 0 0;
}

.auth-link-row a {
  color: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
}

.auth-link-row a:hover {
  text-decoration: underline;
}

@media (max-width: 960px) {
  .landing-hero,
  .landing-feature-grid,
  .dashboard-grid,
  .entries-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  #pageShell {
    width: min(100% - 1rem, 1180px);
    padding-top: 1rem;
  }

  #siteHeader,
  #topBar,
  .panel-head,
  .form-actions,
  .modal-head {
    display: grid;
    align-items: start;
  }

  .brand-block,
  .topbar-heading {
    align-items: start;
  }

  .landing-hero,
  .landing-feature-grid,
  .form-grid,
  #entryControls,
  .dashboard-grid,
  .entries-grid {
    grid-template-columns: 1fr;
  }

  #mainTitle {
    max-width: none;
    font-size: 1.6rem;
  }

  .landing-title {
    max-width: none;
  }

  .landing-hero-logo {
    width: min(100%, 220px);
    max-height: 220px;
  }

  .brand-logo,
  .topbar-logo {
    width: 44px;
    height: 44px;
  }
}