:root {
  --bg: #07090f;
  --bg-2: #0b0f17;
  --bg-3: #11161f;
  --bg-4: #161c27;

  --text: #f5f7fa;
  --muted: #8896ab;
  --muted-2: #5d6a80;
  --muted-3: #404a5d;

  --line: rgba(255, 255, 255, 0.07);
  --line-2: rgba(255, 255, 255, 0.13);
  --line-3: rgba(255, 255, 255, 0.22);

  --cool: #4fa4ff;
  --cool-soft: #85b7eb;
  --mid: #2cc28e;
  --mid-soft: #5dcaa5;
  --warm: #f0a934;
  --warm-soft: #fac775;
  --hot: #ef6a3d;

  --grad: linear-gradient(90deg, #4fa4ff 0%, #2cc28e 55%, #f0a934 100%);

  --dot: rgba(255, 255, 255, 0.045);
  --orb-cool: #2e83ff;
  --orb-warm: #f0a934;
  --orb-cool-opacity: 0.22;
  --orb-warm-opacity: 0.16;
  --shadow-panel: 0 30px 60px rgba(0, 0, 0, 0.55), 0 1px 0 rgba(255, 255, 255, 0.04) inset;

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter Tight", -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
}

[data-theme="light"] {
  --bg: #fbfcfd;
  --bg-2: #f3f6fa;
  --bg-3: #ecf0f5;
  --bg-4: #dee5ed;

  --text: #0b0f17;
  --muted: #5d6a80;
  --muted-2: #8a95a6;
  --muted-3: #b4bdcb;

  --line: rgba(11, 15, 23, 0.07);
  --line-2: rgba(11, 15, 23, 0.13);
  --line-3: rgba(11, 15, 23, 0.22);

  --cool: #185fa5;
  --cool-soft: #378add;
  --mid: #0f6e56;
  --mid-soft: #1d9e75;
  --warm: #854f0b;
  --warm-soft: #ba7517;
  --hot: #993c1d;

  --dot: rgba(11, 15, 23, 0.05);
  --orb-cool: #2e83ff;
  --orb-warm: #f0a934;
  --orb-cool-opacity: 0.1;
  --orb-warm-opacity: 0.08;
  --shadow-panel: 0 24px 48px rgba(11, 15, 23, 0.08), 0 1px 0 rgba(255, 255, 255, 0.6) inset;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

html {
  color-scheme: dark;
}

[data-theme="light"] {
  color-scheme: light;
}

body {
  font-family: var(--sans);
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle dot grid background */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(var(--dot) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: center top;
  z-index: -2;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
}

/* Soft gradient orbs */
.bg-shape {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  pointer-events: none;
  z-index: -1;
}

.bg-shape--left {
  width: 46vw;
  height: 46vw;
  left: -18vw;
  top: 8vh;
  background: var(--orb-cool);
  opacity: var(--orb-cool-opacity);
}

.bg-shape--right {
  width: 40vw;
  height: 40vw;
  right: -14vw;
  top: 36vh;
  background: var(--orb-warm);
  opacity: var(--orb-warm-opacity);
}

.header,
.hero,
.footer {
  width: min(1200px, calc(100% - 48px));
  margin-inline: auto;
}

/* Header */
.header {
  margin-top: 22px;
  padding-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  animation: rise 0.55s ease both;
}

.logo {
  width: clamp(110px, 14vw, 140px);
  height: auto;
}

.contact-chip {
  appearance: none;
  cursor: pointer;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid var(--line-2);
  border-radius: 8px;
  padding: 8px 12px;
  background: transparent;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  transition: 0.2s ease;
}

.contact-chip:hover {
  border-color: var(--line-3);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}

/* Hero */
.hero {
  padding: 80px 0 40px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
}

.hero-copy {
  animation: rise 0.7s ease both;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  padding: 6px 13px 6px 11px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mid);
  box-shadow: 0 0 0 0 rgba(44, 194, 142, 0.5);
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(44, 194, 142, 0.55);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(44, 194, 142, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(44, 194, 142, 0);
  }
}

h1 {
  font-family: var(--sans);
  margin: 22px 0 0;
  font-size: clamp(40px, 6vw, 78px);
  line-height: 0.97;
  letter-spacing: -0.04em;
  font-weight: 600;
  max-width: 13ch;
  color: var(--text);
}

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.lead {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(15.5px, 1.7vw, 19px);
  max-width: 46ch;
  line-height: 1.55;
}

.actions {
  margin-top: 32px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--sans);
}

.btn--primary {
  color: #07090f;
  background: var(--text);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset;
}

.btn--primary:hover {
  background: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.08);
}

.btn--ghost {
  color: var(--text);
  background: transparent;
  border-color: var(--line-2);
}

.btn--ghost:hover {
  border-color: var(--line-3);
  background: rgba(255, 255, 255, 0.04);
}

/* Dashboard panel mockup */
.hero-visual {
  margin: 0;
  animation: rise 0.95s ease both;
}

.panel {
  position: relative;
  background: linear-gradient(180deg, var(--bg-3) 0%, var(--bg-2) 100%);
  border: 1px solid var(--line-2);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-panel);
}

.panel::before {
  content: "";
  position: absolute;
  inset: -1px;
  background: linear-gradient(180deg, rgba(79, 164, 255, 0.25), transparent 35%);
  pointer-events: none;
  border-radius: 14px;
  z-index: 0;
  opacity: 0.5;
}

.panel > * {
  position: relative;
  z-index: 1;
}

.panel-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.025);
  border-bottom: 1px solid var(--line);
}

.panel-bar-dots {
  display: inline-flex;
  gap: 5px;
}

.panel-bar-dots i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.panel-bar-path {
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px 14px;
  border-bottom: 1px solid var(--line);
}

.panel-title-group {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.panel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mid);
  box-shadow: 0 0 8px rgba(44, 194, 142, 0.7);
}

.panel-title {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.005em;
}

.panel-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted-2);
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.panel-body {
  display: flex;
  flex-direction: column;
}

.unit {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 14px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
}

.unit:last-child {
  border-bottom: 0;
}

.unit-name {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.unit-temp {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 19px;
  color: var(--text);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.unit-temp-unit {
  color: var(--muted-2);
  font-weight: 400;
  margin-left: 1px;
}

.unit-mode {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 8px;
  border-radius: 5px;
  border: 1px solid transparent;
  min-width: 56px;
  text-align: center;
}

.mode--cool {
  color: var(--cool-soft);
  background: rgba(79, 164, 255, 0.09);
  border-color: rgba(79, 164, 255, 0.22);
}

.mode--auto {
  color: var(--mid-soft);
  background: rgba(44, 194, 142, 0.1);
  border-color: rgba(44, 194, 142, 0.24);
}

.mode--heat {
  color: var(--warm-soft);
  background: rgba(240, 169, 52, 0.1);
  border-color: rgba(240, 169, 52, 0.26);
}

.panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.02);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted-2);
}

.panel-stat b {
  color: var(--text);
  font-weight: 500;
}

.panel-stat em {
  color: var(--muted-3);
  font-style: normal;
  margin: 0 4px;
}

.panel-modbus {
  color: var(--muted-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Section label */
.section-label {
  margin: 96px 0 26px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-2);
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--line-2);
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  animation: rise 1.2s ease both;
}

.features article {
  background: var(--bg);
  padding: 26px 24px 28px;
  position: relative;
  transition: background 0.3s ease;
  backdrop-filter: none;
  box-shadow: none;
}

.features article:hover {
  background: var(--bg-2);
}

.features .index {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted-3);
  margin-bottom: 16px;
}

.features h3 {
  margin: 0;
  font-size: 19px;
  line-height: 1.22;
  letter-spacing: -0.013em;
  font-weight: 500;
  color: var(--text);
}

.features p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.6;
}

/* Footer */
.footer {
  margin-top: 64px;
  padding: 22px 0 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer a:hover {
  color: var(--text);
}

body.modal-open {
  overflow: hidden;
}

.login-modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.22s ease, visibility 0.22s ease;
}

.login-modal[aria-hidden="true"] {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background:
    radial-gradient(circle at 28% 20%, rgba(79, 164, 255, 0.2), transparent 30%),
    radial-gradient(circle at 80% 76%, rgba(240, 169, 52, 0.17), transparent 28%),
    rgba(3, 5, 10, 0.72);
  backdrop-filter: blur(18px);
  cursor: pointer;
}

[data-theme="light"] .login-backdrop {
  background:
    radial-gradient(circle at 28% 20%, rgba(79, 164, 255, 0.16), transparent 30%),
    radial-gradient(circle at 80% 76%, rgba(240, 169, 52, 0.12), transparent 28%),
    rgba(245, 248, 252, 0.76);
}

.login-dialog {
  position: relative;
  width: min(100%, 430px);
  border: 1px solid var(--line-2);
  border-radius: 18px;
  padding: 30px;
  background: linear-gradient(180deg, var(--bg-3) 0%, var(--bg-2) 100%);
  box-shadow: var(--shadow-panel);
  transform: translateY(0) scale(1);
  transition: transform 0.22s ease;
}

.login-dialog[hidden] {
  display: none;
}

[data-theme="light"] .login-dialog {
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-2) 100%);
}

.login-modal[aria-hidden="true"] .login-dialog {
  transform: translateY(10px) scale(0.98);
}

.login-dialog::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 18px;
  background: linear-gradient(130deg, rgba(79, 164, 255, 0.25), transparent 38%, rgba(240, 169, 52, 0.22));
  pointer-events: none;
  opacity: 0.55;
}

.login-dialog > * {
  position: relative;
  z-index: 1;
}

.login-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line-2);
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: 0.2s ease;
}

.login-close:hover {
  color: var(--text);
  border-color: var(--line-3);
  background: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] .login-close:hover {
  background: rgba(11, 15, 23, 0.04);
}

.login-close span {
  position: absolute;
  left: 9px;
  top: 15px;
  width: 14px;
  height: 1.5px;
  background: currentColor;
}

.login-close span:first-child {
  transform: rotate(45deg);
}

.login-close span:last-child {
  transform: rotate(-45deg);
}

.login-kicker {
  display: inline-flex;
  margin: 0;
  padding: 6px 10px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-dialog h2 {
  margin: 18px 0 0;
  max-width: 10ch;
  color: var(--text);
  font-size: clamp(34px, 7vw, 52px);
  line-height: 0.96;
  letter-spacing: -0.045em;
  font-weight: 600;
}

.login-note {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}

.login-form {
  margin-top: 24px;
  display: grid;
  gap: 13px;
}

.login-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-form input {
  width: 100%;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  padding: 13px 14px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--text);
  outline: none;
  font-family: var(--sans);
  font-size: 16px;
  letter-spacing: 0;
  transition: 0.2s ease;
}

[data-theme="light"] .login-form input {
  background: rgba(11, 15, 23, 0.025);
}

.login-form input:focus {
  border-color: rgba(79, 164, 255, 0.7);
  box-shadow: 0 0 0 4px rgba(79, 164, 255, 0.12);
}

.login-form input::placeholder {
  color: var(--muted-3);
}

.login-submit {
  width: 100%;
  justify-content: center;
  margin-top: 5px;
}

.forgot-link {
  width: fit-content;
  margin: -3px 0 0 auto;
  padding: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: underline;
  text-decoration-color: var(--line-3);
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}

.forgot-link:hover {
  color: var(--text);
  text-decoration-color: currentColor;
}

.forgot-link--back {
  margin: 0 auto;
}

.reset-message {
  min-height: 38px;
  margin: 0;
  color: var(--mid-soft);
  font-size: 14px;
  line-height: 1.4;
  text-align: center;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Header right group + theme toggle */
.header-right {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--line-2);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--line-3);
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

[data-theme="light"] .theme-toggle:hover {
  background: rgba(11, 15, 23, 0.04);
}

.theme-icon {
  width: 16px;
  height: 16px;
  display: block;
}

.theme-icon--moon { display: none; }
.theme-icon--sun { display: block; }

[data-theme="light"] .theme-icon--sun { display: none; }
[data-theme="light"] .theme-icon--moon { display: block; }

/* Logo variants */
.logo--light { display: none; }
.logo--dark { display: block; }

[data-theme="light"] .logo--dark { display: none; }
[data-theme="light"] .logo--light { display: block; }

/* Light-theme component overrides (rgba(white,...) → rgba(dark,...) etc.) */
[data-theme="light"] .contact-chip:hover {
  background: rgba(11, 15, 23, 0.03);
}

[data-theme="light"] .btn--ghost:hover {
  background: rgba(11, 15, 23, 0.03);
}

[data-theme="light"] .btn--primary {
  background: var(--text);
  color: #ffffff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.15) inset;
}

[data-theme="light"] .btn--primary:hover {
  background: #000000;
  box-shadow: 0 10px 30px rgba(11, 15, 23, 0.18);
}

[data-theme="light"] .panel {
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-2) 100%);
}

[data-theme="light"] .panel::before {
  background: linear-gradient(180deg, rgba(79, 164, 255, 0.16), transparent 35%);
  opacity: 0.8;
}

[data-theme="light"] .panel-bar {
  background: rgba(11, 15, 23, 0.025);
}

[data-theme="light"] .panel-bar-dots i {
  background: rgba(11, 15, 23, 0.15);
}

[data-theme="light"] .panel-footer {
  background: rgba(11, 15, 23, 0.025);
}

[data-theme="light"] .panel-dot {
  box-shadow: 0 0 8px rgba(15, 110, 86, 0.4);
}

[data-theme="light"] .features article:hover {
  background: var(--bg-2);
}

/* Mode pills — readable on light backgrounds */
[data-theme="light"] .mode--cool {
  color: #0c447c;
  background: rgba(79, 164, 255, 0.12);
  border-color: rgba(79, 164, 255, 0.35);
}

[data-theme="light"] .mode--auto {
  color: #085041;
  background: rgba(29, 158, 117, 0.12);
  border-color: rgba(29, 158, 117, 0.35);
}

[data-theme="light"] .mode--heat {
  color: #633806;
  background: rgba(240, 169, 52, 0.16);
  border-color: rgba(240, 169, 52, 0.4);
}

/* Pulse keyframes recolored for light theme */
[data-theme="light"] .badge::before {
  background: var(--mid-soft);
  box-shadow: 0 0 0 0 rgba(29, 158, 117, 0.45);
  animation-name: pulse-light;
}

@keyframes pulse-light {
  0% { box-shadow: 0 0 0 0 rgba(29, 158, 117, 0.45); }
  70% { box-shadow: 0 0 0 8px rgba(29, 158, 117, 0); }
  100% { box-shadow: 0 0 0 0 rgba(29, 158, 117, 0); }
}

@media (max-width: 980px) {
  .hero {
    padding: 60px 0 24px;
  }
  .hero-layout {
    grid-template-columns: 1fr;
  }
  h1 {
    max-width: 16ch;
  }
}

@media (max-width: 720px) {
  .header,
  .hero,
  .footer {
    width: min(1200px, calc(100% - 24px));
  }
  .features {
    grid-template-columns: 1fr;
  }
  .section-label {
    margin-top: 72px;
  }
  .unit {
    grid-template-columns: 1fr auto;
  }
  .unit-mode {
    grid-column: 2;
  }
  .unit-temp {
    grid-column: 1 / -1;
    text-align: left;
    font-size: 22px;
  }
}