:root {

  /* =========================
     TYPOGRAPHY
  ========================= */
  --font-family: system-ui, -apple-system, "Segoe UI", Roboto,
                  Helvetica, Arial, sans-serif;

  --font-size-base: 16px;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  --line-height: 1.6;

  /* =========================
     COLORS (LIGHT THEME)
  ========================= */
  --color-primary: #dc2626;
  --color-primary-hover: #b91c1c;

  --color-text: #1f2937;
  --color-text-muted: #6b7280;

  --color-border: #d1d5db;

  --color-focus: #3b82f6;

  --color-danger-bg: #fef2f2;
  --color-danger-text: #991b1b;

  --color-link: #0078d4;

  --color-white: #ffffff;

  /* =========================
     SPACING SYSTEM (8px GRID)
  ========================= */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;

  /* =========================
     RADIUS
  ========================= */
  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* =========================
     SHADOWS
  ========================= */
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 12px 30px rgba(0, 0, 0, 0.08);

  /* =========================
     TRANSITIONS
  ========================= */
  --transition-fast: 0.2s ease;
}

/* =========================
   RESET
========================= */
html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* =========================
   BASE
========================= */
html,
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  font-weight: var(--font-weight-regular);

  color: var(--color-text);

  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* =========================
   LAYOUT HELPERS
========================= */
.hidden {
  display: none;
}

.btn-disabled {
  cursor: not-allowed;
  opacity: 0.6;
  pointer-events: none;
}

/* =========================
   BACKGROUND
========================= */
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;

  background: url('/images/sample.svg') right / cover no-repeat;
}

/* =========================
   LOGO
========================= */
.logo {
  position: absolute;
  top: var(--space-6);
  left: var(--space-6);
}

.logo img {
  height: 72px;
}

/* =========================
   GREETING
========================= */
.greeting {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  font-size: var(--font-size-lg);
  opacity: 0.8;
}

/* =========================
   CARD
========================= */
.login-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 420px;
  padding: var(--space-8);

  box-shadow: var(--shadow-md);
}

/* =========================
   TYPOGRAPHY
========================= */
.login-card h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  margin-bottom: var(--space-1);
  letter-spacing: -0.02em;
}

.subtitle {
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* =========================
   FORM
========================= */
.form-group {
  margin-bottom: var(--space-4);
}

.input-field {
  width: 100%;
  padding: var(--space-3) var(--space-4);

  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);

  font-size: var(--font-size-md);

  transition: var(--transition-fast);
}

.input-field:focus {
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  outline: none;
}

/* =========================
   ERROR
========================= */
.error-message {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);

  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);

  font-size: var(--font-size-sm);

  display: none;
  align-items: center;
  gap: var(--space-2);
}

/* =========================
   FORGOT
========================= */
.forgot {
  text-align: right;
  font-size: var(--font-size-sm);
}

.forgot a {
  color: var(--color-primary);
  text-decoration: none;
}

.forgot a:hover {
  text-decoration: underline;
}

/* =========================
   BUTTON
========================= */
.btn-login {
  width: 100%;
  background: var(--color-primary);
  color: var(--color-white);

  padding: var(--space-4);

  border: none;
  border-radius: var(--radius-md);

  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-md);

  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);

  transition: var(--transition-fast);
}

.btn-login:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

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

/* =========================
   SPINNER
========================= */
.spinner {
  animation: spin 1s linear infinite;
  height: 18px;
  width: 18px;
}

@keyframes spin {
  100% {
    transform: rotate(360deg);
  }
}

/* =========================
   HR LINK
========================= */
.hr-portal-access {
  margin-top: var(--space-8);
  text-align: center;
}

.hr-portal-access a {
  display: inline-block;

  color: var(--color-link);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);

  padding: var(--space-2) var(--space-3);

  border: 1px solid var(--color-link);
  border-radius: var(--radius-sm);

  transition: var(--transition-fast);

  text-decoration: none;
}

.hr-portal-access a:hover {
  background: var(--color-link);
  color: var(--color-white);
  
}