/* === CSS Custom Properties === */
:root {
  /* USWDS-inspired federal palette */
  --color-primary: #005ea2;
  --color-primary-dark: #1a4480;
  --color-primary-darker: #162e51;
  --color-primary-light: #73b3e7;
  --color-primary-lightest: #d9e8f6;

  --color-accent: #e52207;
  --color-accent-warm: #fa9441;
  --color-accent-cool: #00bde3;

  /* Status colors */
  --color-status-finalist: #008817;
  --color-status-pilot: #947100;
  --color-status-pilot-done: #008817;
  --color-status-demo-completed: #005ea2;
  --color-status-demo-scheduled: #00687d;
  --color-status-research-done: #005ea2;
  --color-status-initial-review: #5c5c5c;
  --color-status-eliminated: #b50909;
  --color-status-on-hold: #8b6e00;

  /* Neutrals */
  --color-white: #ffffff;
  --color-gray-1: #f9f9f9;
  --color-gray-2: #f0f0f0;
  --color-gray-3: #dfe1e2;
  --color-gray-5: #c6cace;
  --color-gray-10: #a9aeb1;
  --color-gray-30: #71767a;
  --color-gray-50: #565c65;
  --color-gray-70: #3d4551;
  --color-gray-90: #1b1b1b;
  --color-ink: #1b1b1b;

  /* Semantic */
  --color-success: #008817;
  --color-warning: #e5a000;
  --color-error: #d63e04;
  --color-info: #00bde3;

  /* Typography */
  --font-family: 'Source Sans 3', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;

  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Border radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.12);

  /* Layout */
  --max-width: 1200px;
  --header-height: 56px;
}

/* === Reset === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-ink);
  background: var(--color-gray-1);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: underline; }
a:hover { color: var(--color-primary-dark); }
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
button { cursor: pointer; font-family: inherit; }
ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-gray-90);
}

/* === Skip Link === */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  z-index: 1000;
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
}
.skip-link:focus {
  top: 0;
}

/* === Header === */
.site-header {
  background: var(--color-primary-darker);
  color: var(--color-white);
  height: var(--header-height);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  white-space: nowrap;
}

.site-logo {
  height: 36px;
  width: auto;
}

/* === Navigation === */
.nav-list {
  display: flex;
  gap: var(--space-1);
  align-items: center;
}

.nav-link {
  color: var(--color-gray-5);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.nav-link:hover {
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
}

.nav-link.active {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: transform 0.2s;
}

/* === Main Content === */
.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

.app-container {
  min-height: 400px;
}

/* === Footer === */
.site-footer {
  background: var(--color-gray-2);
  border-top: 1px solid var(--color-gray-3);
  padding: var(--space-4);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-50);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* === View Title === */
.view-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

.view-subtitle {
  color: var(--color-gray-50);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  margin-bottom: var(--space-6);
}

/* === Back Link === */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
  text-decoration: none;
}
.back-link::before {
  content: '\2190';
}

/* === Loading / Error States === */
.loading-state {
  text-align: center;
  padding: var(--space-12);
  color: var(--color-gray-50);
}

.error-state {
  text-align: center;
  padding: var(--space-12);
  color: var(--color-error);
}

/* === Responsive === */
@media (max-width: 1023px) {
  .title-full {
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 639px) {
  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary-darker);
    padding: var(--space-2) var(--space-4);
    box-shadow: var(--shadow-md);
  }

  .site-nav.open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link {
    display: block;
    padding: var(--space-3) var(--space-4);
  }

  .nav-toggle {
    display: flex;
  }

  .title-full {
    font-size: var(--font-size-xs);
  }
}

/* === Tab Bar === */
.tab-bar {
  display: flex;
  gap: var(--space-1);
  border-bottom: 2px solid var(--color-gray-3);
  margin-bottom: var(--space-4);
}

.tab-bar-tab {
  padding: var(--space-2) var(--space-4);
  border: none;
  background: none;
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-50);
  cursor: pointer;
  position: relative;
  bottom: -2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.tab-bar-tab:hover {
  color: var(--color-primary);
}

.tab-bar-tab--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-bar-tab:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  border-radius: var(--radius-sm);
}

/* === Authentication === */
/* Login Page */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-4);
  background: var(--color-gray-1);
  position: relative;
  overflow: hidden;
}

.login-card {
  background: rgba(255, 255, 255, 0.98);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 480px;
  width: 100%;
  overflow: hidden;
  position: relative;
  z-index: 1;
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-header {
  background: linear-gradient(135deg, var(--color-primary-darker) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--space-10) var(--space-6) var(--space-8);
  text-align: center;
}

.login-logo {
  height: 120px;
  width: auto;
  margin: 0 auto var(--space-6);
  filter: brightness(0) invert(1) drop-shadow(0 4px 12px rgba(0, 0, 0, 0.2));
}

.login-header h1 {
  color: var(--color-white);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
  line-height: 1.2;
}

.login-subtitle {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  letter-spacing: 0.3px;
}

.login-body {
  padding: 0 var(--space-6) var(--space-8);
}

.login-message {
  color: var(--color-gray-70);
  margin-bottom: var(--space-8);
  text-align: center;
  line-height: 1.6;
  font-size: var(--font-size-base);
}

.btn-login {
  width: 100%;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, #005ea2 0%, #1a4480 100%);
  color: var(--color-white);
  border: none;
  border-radius: 8px;
  font-size: 1.125rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  transition: all 0.3s ease;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 94, 162, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-login::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

.btn-login:hover:not(:disabled)::before {
  left: 100%;
}

.btn-login:hover:not(:disabled) {
  background: linear-gradient(135deg, #1a4480 0%, #005ea2 100%);
  box-shadow: 0 6px 20px rgba(0, 94, 162, 0.4);
  transform: translateY(-2px);
}

.btn-login:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 94, 162, 0.3);
}

.btn-login:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-login-icon {
  height: 28px;
  width: auto;
  filter: brightness(0) invert(1);
}

.login-footer {
  background: var(--color-gray-1);
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-gray-3);
}

.login-help {
  color: var(--color-gray-50);
  font-size: var(--font-size-sm);
  text-align: center;
  line-height: 1.5;
}

/* User Info in Header */
.user-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: var(--space-4);
}

.user-name {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}

.btn-logout {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.btn-logout:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-logout:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

/* Responsive adjustments for auth UI */
@media (max-width: 639px) {
  .user-info {
    position: absolute;
    top: var(--header-height);
    right: 0;
    background: var(--color-primary-darker);
    padding: var(--space-2) var(--space-4);
    box-shadow: var(--shadow-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    justify-content: space-between;
    margin-left: 0;
  }

  .login-card {
    max-width: 100%;
  }

  .login-header {
    padding: var(--space-6) var(--space-4);
  }

  .login-body {
    padding: var(--space-6) var(--space-4);
  }

  .login-footer {
    padding: var(--space-3) var(--space-4);
  }
}

/* === Print === */
@media print {
  .site-header, .site-footer, .nav-toggle, .skip-link {
    display: none !important;
  }
  .main-content {
    padding: 0;
    max-width: 100%;
  }
  body {
    background: white;
    font-size: 10pt;
  }
}