/* ============================================
   BASE.CSS - Eight Minute Empire
   Modern, clear, strategic design system
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Colors - Inspired by game board aesthetics */
  --color-background: #fdfcfa;
  --color-surface: #ffffff;
  --color-surface-secondary: #f5f3f0;
  
  --color-text: #2c2419;
  --color-text-secondary: #5c5245;
  --color-text-muted: #8a8078;
  
  /* Primary - Strategic gold/amber from game elements */
  --color-primary: #d4a574;
  --color-primary-dark: #b8854f;
  --color-primary-light: #e8c9a4;
  --color-primary-subtle: #f5ebe0;
  
  /* Success - Victory green */
  --color-success: #6b9b7f;
  --color-success-dark: #567d65;
  --color-success-light: #9bc4af;
  --color-success-subtle: #e8f3ed;
  
  /* Warning - Tactical amber */
  --color-warning: #e6a745;
  --color-warning-dark: #c78a2e;
  --color-warning-light: #f2c781;
  --color-warning-subtle: #fef5e7;
  
  /* Danger - Battle red */
  --color-danger: #c85a54;
  --color-danger-dark: #a64740;
  --color-danger-light: #e08b86;
  --color-danger-subtle: #fceeed;
  
  /* Neutral grays - Map terrain tones */
  --color-gray-50: #fafaf9;
  --color-gray-100: #f5f4f2;
  --color-gray-200: #e8e6e3;
  --color-gray-300: #d4d0cb;
  --color-gray-400: #a8a199;
  --color-gray-500: #7c7669;
  --color-gray-600: #5c5245;
  --color-gray-700: #3d372e;
  --color-gray-800: #2c2419;
  --color-gray-900: #1a1510;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
  --font-display: 'Georgia', 'Times New Roman', serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 1.75;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing scale */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-base: 0.5rem;  /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows - Strategic depth */
  --shadow-xs: 0 1px 2px 0 rgba(44, 36, 25, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(44, 36, 25, 0.08), 0 1px 2px -1px rgba(44, 36, 25, 0.06);
  --shadow-base: 0 4px 6px -1px rgba(44, 36, 25, 0.08), 0 2px 4px -2px rgba(44, 36, 25, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(44, 36, 25, 0.08), 0 4px 6px -4px rgba(44, 36, 25, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(44, 36, 25, 0.08), 0 8px 10px -6px rgba(44, 36, 25, 0.06);
  --shadow-xl: 0 25px 50px -12px rgba(44, 36, 25, 0.12);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  --transition-slower: 500ms ease;
  
  /* Z-index scale */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  line-height: inherit;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

hr {
  height: 0;
  color: inherit;
  border-top-width: 1px;
}

abbr[title] {
  text-decoration: underline dotted;
}

b,
strong {
  font-weight: bolder;
}

code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: 1em;
}

small {
  font-size: 80%;
}

sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

table {
  text-indent: 0;
  border-color: inherit;
  border-collapse: collapse;
}

button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: inherit;
  color: inherit;
  margin: 0;
  padding: 0;
}

button,
select {
  text-transform: none;
}

button,
[type='button'],
[type='reset'],
[type='submit'] {
  -webkit-appearance: button;
  background-color: transparent;
  background-image: none;
}

:-moz-focusring {
  outline: auto;
}

:-moz-ui-invalid {
  box-shadow: none;
}

progress {
  vertical-align: baseline;
}

::-webkit-inner-spin-button,
::-webkit-outer-spin-button {
  height: auto;
}

[type='search'] {
  -webkit-appearance: textfield;
  outline-offset: -2px;
}

::-webkit-search-decoration {
  -webkit-appearance: none;
}

::-webkit-file-upload-button {
  -webkit-appearance: button;
  font: inherit;
}

summary {
  display: list-item;
}

blockquote,
dl,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
figure,
p,
pre {
  margin: 0;
}

fieldset {
  margin: 0;
  padding: 0;
}

legend {
  padding: 0;
}

ol,
ul,
menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

textarea {
  resize: vertical;
}

input::placeholder,
textarea::placeholder {
  opacity: 1;
  color: var(--color-text-muted);
}

button,
[role="button"] {
  cursor: pointer;
}

:disabled {
  cursor: default;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
  height: auto;
}

img,
video {
  max-width: 100%;
  height: auto;
}

[hidden] {
  display: none;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: -0.025em;
}

h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--font-size-3xl);
  letter-spacing: -0.015em;
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

@media (max-width: 768px) {
  h1 {
    font-size: var(--font-size-4xl);
  }
  
  h2 {
    font-size: var(--font-size-3xl);
  }
  
  h3 {
    font-size: var(--font-size-2xl);
  }
}

p {
  margin-bottom: var(--space-4);
  max-width: 65ch;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-primary-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
}

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

strong,
b {
  font-weight: var(--font-weight-semibold);
}

em,
i {
  font-style: italic;
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-gray-100);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  padding: var(--space-4);
  background-color: var(--color-gray-100);
  border-radius: var(--radius-base);
  overflow-x: auto;
  margin-bottom: var(--space-4);
}

pre code {
  padding: 0;
  background: none;
}

blockquote {
  padding-left: var(--space-6);
  border-left: 4px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

hr {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-8) 0;
}

/* Lists */
ul,
ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}


ol {
  list-style-type: decimal;
}

li {
  margin-bottom: var(--space-2);
}

li:last-child {
  margin-bottom: 0;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

.container-sm {
  max-width: 640px;
}

.container-md {
  max-width: 768px;
}

.container-lg {
  max-width: 1024px;
}

.container-xl {
  max-width: 1280px;
}

.container-full {
  max-width: 100%;
}

@media (max-width: 640px) {
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
}

/* Flex utilities */
.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

.flex-row {
  flex-direction: row;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-nowrap {
  flex-wrap: nowrap;
}

.items-start {
  align-items: flex-start;
}

.items-center {
  align-items: center;
}

.items-end {
  align-items: flex-end;
}

.items-stretch {
  align-items: stretch;
}

.justify-start {
  justify-content: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-end {
  justify-content: flex-end;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.gap-10 { gap: var(--space-10); }
.gap-12 { gap: var(--space-12); }

/* Grid utilities */
.grid {
  display: grid;
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

@media (max-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .sm\:grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
}

/* Spacing utilities */
.m-0 { margin: var(--space-0); }
.m-auto { margin: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

.p-0 { padding: var(--space-0); }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

/* Text utilities */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

/* Display utilities */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.hidden { display: none; }

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   COMPONENTS
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-normal);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  color: var(--color-text);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

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

.btn-secondary {
  color: var(--color-text);
  background-color: var(--color-surface);
  border-color: var(--color-gray-300);
}

.btn-secondary:hover {
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.btn-success {
  color: var(--color-surface);
  background-color: var(--color-success);
  border-color: var(--color-success);
}

.btn-success:hover {
  background-color: var(--color-success-dark);
  border-color: var(--color-success-dark);
}

.btn-outline {
  color: var(--color-primary-dark);
  background-color: transparent;
  border-color: var(--color-primary);
}

.btn-outline:hover {
  color: var(--color-text);
  background-color: var(--color-primary-subtle);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

/* Inputs */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-base);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  background-color: var(--color-gray-50);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%235c5245' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-position: right var(--space-3) center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: var(--space-10);
}

.label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-helper {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-error {
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-danger);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.card-content {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-footer {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-gray-200);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-primary {
  color: var(--color-primary-dark);
  background-color: var(--color-primary-subtle);
}

.badge-success {
  color: var(--color-success-dark);
  background-color: var(--color-success-subtle);
}

.badge-warning {
  color: var(--color-warning-dark);
  background-color: var(--color-warning-subtle);
}

.badge-danger {
  color: var(--color-danger-dark);
  background-color: var(--color-danger-subtle);
}

/* Alerts */
.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-base);
  border-left: 4px solid;
  margin-bottom: var(--space-4);
}

.alert-info {
  color: var(--color-text);
  background-color: var(--color-primary-subtle);
  border-color: var(--color-primary);
}

.alert-success {
  color: var(--color-success-dark);
  background-color: var(--color-success-subtle);
  border-color: var(--color-success);
}

.alert-warning {
  color: var(--color-warning-dark);
  background-color: var(--color-warning-subtle);
  border-color: var(--color-warning);
}

.alert-danger {
  color: var(--color-danger-dark);
  background-color: var(--color-danger-subtle);
  border-color: var(--color-danger);
}

/* Section */
.section {
  padding: var(--space-16) 0;
}

.section-sm {
  padding: var(--space-12) 0;
}

.section-lg {
  padding: var(--space-24) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-12) 0;
  }
  
  .section-sm {
    padding: var(--space-8) 0;
  }
  
  .section-lg {
    padding: var(--space-16) 0;
  }
}

/* Divider */
.divider {
  height: 1px;
  background-color: var(--color-gray-200);
  border: none;
  margin: var(--space-8) 0;
}

/* Image wrapper */
.img-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.img-wrapper img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-slow);
}

.img-wrapper:hover img {
  transform: scale(1.05);
}

/* Links with icon */
.link-icon {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-medium);
  transition: gap var(--transition-base);
}

.link-icon:hover {
  gap: var(--space-3);
  color: var(--color-primary);
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
@media (max-width: 640px) {
  .sm\:hidden { display: none; }
  .sm\:block { display: block; }
}

@media (max-width: 768px) {
  .md\:hidden { display: none; }
  .md\:block { display: block; }
}

@media (max-width: 1024px) {
  .lg\:hidden { display: none; }
  .lg\:block { display: block; }
}

@media (min-width: 641px) {
  .sm\:show { display: none; }
}

@media (min-width: 769px) {
  .md\:show { display: none; }
}

@media (min-width: 1025px) {
  .lg\:show { display: none; }
}