* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --black: #050608;
  --deep: #0d1219;
  --line: rgba(255, 255, 255, 0.12);
  --blue: #0f62fe;
  --blue-hover: #0353e9;
  --gold: #c5961a;
  --text-light: #f5f5f7;
  --text-light-soft: rgba(255, 255, 255, 0.68);
  --text-dark: #161616;
  --text-dark-soft: #525252;
  --surface: #ffffff;
  --danger: #da1e28;
}

body {
  min-height: 100vh;
  font-family: 'IBM Plex Sans', 'Segoe UI', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  background: #dfe3e8;
  color: var(--text-dark);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(420px, 0.85fr);
}

.visual-panel {
  position: relative;
  padding: 36px 40px 44px;
  background:
    radial-gradient(circle at top right, rgba(197, 150, 26, 0.14), transparent 26%),
    linear-gradient(180deg, var(--deep) 0%, var(--black) 100%);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.visual-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 120px 120px;
  opacity: 0.22;
  pointer-events: none;
}

.brand-link,
.back-home {
  position: relative;
  z-index: 1;
  text-decoration: none;
}

.brand-link {
  display: inline-block;
  color: var(--gold);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.visual-content {
  position: relative;
  z-index: 1;
  max-width: 620px;
  margin-top: 60px;
}

.coord,
.eyebrow,
.welcome {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 600;
}

.coord {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(197, 150, 26, 0.24);
  border-radius: 999px;
  background: rgba(197, 150, 26, 0.12);
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 18px;
}

.eyebrow {
  color: rgba(255, 255, 255, 0.56);
  margin-bottom: 18px;
}

.visual-content h1 {
  font-family: 'SF Pro Display', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
  font-size: clamp(40px, 5vw, 58px);
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
}

.visual-content p {
  max-width: 560px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-light-soft);
}

.signal-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.signal-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
  padding: 18px;
  backdrop-filter: blur(16px);
}

.signal-card strong {
  display: block;
  font-size: 16px;
  line-height: 1.3;
  margin-bottom: 8px;
}

.signal-card span {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
}

.visual-footer {
  position: relative;
  z-index: 1;
  margin-top: 36px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.32);
  letter-spacing: 0.06em;
}

.login-panel {
  background: var(--surface);
  min-height: 100vh;
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.back-home {
  position: absolute;
  top: 28px;
  left: 32px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #6f6f6f;
  font-size: 13px;
}

.back-home:hover {
  color: var(--text-dark);
}

.back-home svg {
  width: 16px;
  height: 16px;
}

.login-form-container {
  width: 100%;
  max-width: 360px;
}

.welcome {
  color: #6f6f6f;
  margin-bottom: 10px;
}

.login-form-container h1 {
  font-size: 30px;
  line-height: 1.14;
  margin-bottom: 10px;
}

.desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dark-soft);
  margin-bottom: 32px;
}

.form-field {
  margin-bottom: 20px;
}

.form-field label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: #525252;
  text-transform: uppercase;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrapper > svg {
  position: absolute;
  left: 14px;
  width: 18px;
  height: 18px;
  color: #6f6f6f;
  pointer-events: none;
}

.input-wrapper input {
  width: 100%;
  border: 1px solid #c6c6c6;
  border-radius: 8px;
  padding: 15px 46px 15px 46px;
  background: #f4f4f4;
  color: var(--text-dark);
  font-size: 15px;
  outline: none;
}

.input-wrapper input:focus {
  border-color: var(--blue);
  background: #ffffff;
  box-shadow: 0 0 0 2px rgba(15, 98, 254, 0.12);
}

.toggle-pwd {
  position: absolute;
  right: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: #6f6f6f;
  cursor: pointer;
}

.toggle-pwd:hover {
  color: var(--text-dark);
}

.toggle-pwd svg {
  width: 18px;
  height: 18px;
}

.submit-btn {
  width: 100%;
  min-height: 52px;
  border: none;
  border-radius: 8px;
  background: var(--blue);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.submit-btn:hover {
  background: var(--blue-hover);
}

.submit-btn:active {
  transform: translateY(1px);
}

.submit-btn.loading {
  pointer-events: none;
  opacity: 0.82;
}

.submit-btn.loading::after {
  content: '';
  display: inline-block;
  width: 15px;
  height: 15px;
  margin-left: 8px;
  border: 2px solid rgba(255, 255, 255, 0.32);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-msg {
  display: none;
  margin-top: 16px;
  border: 1px solid rgba(218, 30, 40, 0.25);
  border-radius: 8px;
  background: rgba(218, 30, 40, 0.06);
  color: var(--danger);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.6;
}

.security-note {
  margin-top: 18px;
  font-size: 12px;
  color: #6f6f6f;
  letter-spacing: 0.04em;
}

@media (max-width: 1080px) {
  .login-shell {
    grid-template-columns: 1fr;
  }

  .visual-panel {
    min-height: 420px;
  }
}

@media (max-width: 768px) {
  .visual-panel,
  .login-panel {
    padding: 24px 22px 28px;
  }

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

  .back-home {
    top: 18px;
    left: 20px;
  }

  .login-form-container {
    max-width: none;
    margin-top: 48px;
  }
}