:root {
  --bg-color: #ffffff;
  --bg-bottom: #f7f8fc;
  --glow-a: rgba(102, 126, 234, 0.15);
  --glow-b: rgba(80, 98, 202, 0.13);
  --text-color: #1a1a1a;
  --muted: #555d68;
  --card-bg: #f5f5f5;
  --panel-bg: #fafafa;
  --border-color: #e0e0e0;
  --accent-color: #667eea;
  --accent-deep: #5166d8;
  --danger: #a83a3a;
  --placeholder: #8690a0;
  --surface: #ffffff;
  --surface-soft: #f6f7fa;
  --shadow-a: rgba(15, 23, 42, 0.08);
  --shadow-b: rgba(15, 23, 42, 0.06);
  --toggle-shadow: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --bg-color: #121722;
  --bg-bottom: #0e1119;
  --glow-a: rgba(140, 157, 255, 0.2);
  --glow-b: rgba(85, 108, 232, 0.18);
  --text-color: #f2f5ff;
  --muted: #bec8da;
  --card-bg: #1b2230;
  --panel-bg: #171d2a;
  --border-color: #323a4f;
  --accent-color: #8b9dff;
  --accent-deep: #7086fa;
  --danger: #ff9a9a;
  --placeholder: #93a0ba;
  --surface: #1f2736;
  --surface-soft: #262f41;
  --shadow-a: rgba(0, 0, 0, 0.34);
  --shadow-b: rgba(0, 0, 0, 0.24);
  --toggle-shadow: rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text-color);
  font-family:
    "Lexend",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial,
    sans-serif;
  background:
    radial-gradient(circle at 8% 15%, var(--glow-a), transparent 28%),
    radial-gradient(circle at 92% 82%, var(--glow-b), transparent 34%),
    linear-gradient(180deg, var(--bg-color) 0%, var(--bg-bottom) 100%);
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.theme-toggle {
  position: fixed;
  top: 18px;
  right: 18px;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  border: 2px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-color);
  box-shadow: 0 8px 18px var(--toggle-shadow);
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    transform 0.18s ease,
    background-color 0.18s ease,
    border-color 0.18s ease;
}

.theme-toggle:hover {
  transform: rotate(12deg);
}

.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

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

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 20px;
}

.layout {
  width: min(1040px, 100%);
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1fr);
  gap: 26px;
  align-items: stretch;
  animation: rise-in 420ms ease-out both;
}

.panel {
  border: 1px solid var(--border-color);
  border-radius: 18px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--panel-bg) 85%, #ffffff 15%) 0%, var(--panel-bg) 100%);
  box-shadow:
    0 18px 40px var(--shadow-a),
    0 3px 10px var(--shadow-b);
}

.brand-panel {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

.avatar {
  width: 78px;
  height: 78px;
  border-radius: 999px;
  border: 3px solid var(--border-color);
  background: radial-gradient(circle at 32% 30%, #8ea2ff, var(--accent-color));
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.eyebrow {
  margin: 0;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: #3e4b81;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.1;
  font-weight: 750;
}

h1 span {
  font-weight: 420;
}

.lede {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 38ch;
}

.card {
  background: linear-gradient(180deg, color-mix(in srgb, var(--card-bg) 65%, #ffffff 35%) 0%, var(--card-bg) 100%);
  padding: 28px;
}

h2 {
  margin: 0 0 18px;
  font-size: 1.2rem;
  font-weight: 700;
}

.login-form {
  display: grid;
  gap: 10px;
}

.login-form label {
  font-size: 0.92rem;
  font-weight: 650;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    transform 0.2s ease;
}

.input-row:focus-within {
  border-color: color-mix(in srgb, var(--accent-color) 46%, var(--border-color) 54%);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.16);
  transform: translateY(-1px);
}

input {
  width: 100%;
  border: 0;
  padding: 14px 14px;
  font: inherit;
  color: var(--text-color);
  background: transparent;
}

input:focus {
  outline: none;
}

input::placeholder {
  color: var(--placeholder);
}

.suffix {
  border-left: 1px solid var(--border-color);
  background: var(--surface-soft);
  color: #4f5766;
  padding: 14px 13px;
  display: grid;
  place-items: center;
  white-space: nowrap;
  font-size: 0.92rem;
}

.preview,
.error {
  min-height: 1.2rem;
  margin: 0;
  font-size: 0.9rem;
}

.preview {
  color: var(--muted);
}

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

.login-form button {
  width: fit-content;
  min-width: 148px;
  margin-top: 4px;
  border: 0;
  border-radius: 10px;
  padding: 11px 18px;
  color: #fff;
  font: inherit;
  font-weight: 700;
  background: linear-gradient(180deg, var(--accent-color), var(--accent-deep));
  box-shadow: 0 10px 20px rgba(81, 102, 216, 0.24);
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    filter 0.2s ease;
}

.login-form button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 24px rgba(81, 102, 216, 0.3);
  filter: saturate(1.05);
}

.login-form button:active {
  transform: translateY(0);
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 820px) {
  .shell {
    padding: 16px;
  }

  .theme-toggle {
    width: 44px;
    height: 44px;
    top: 12px;
    right: 12px;
  }

  .layout {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .brand-panel,
  .card {
    padding: 20px;
    border-radius: 14px;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .suffix {
    border-left: 0;
    border-top: 1px solid var(--border-color);
    justify-content: center;
  }

  .login-form button {
    width: 100%;
  }
}