/*
 * Warm Classless - A Welcoming, Minimal CSS Framework
 * For customer-facing applications
 * Version 1.0.0
 */

/* ---------------------------------- */
/* 1. Core Design System (Variables)  */
/* ---------------------------------- */

:root {
  /* Fonts & Typography */
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-size-base: 1rem; /* 16px */
  --line-height: 1.65;

  /* Colors - Warm & Muted */
  --color-text: #2d2d2d;
  --color-text-secondary: #6b6b6b;
  --color-bg: #fdfcfb;
  --color-bg-secondary: #f7f5f3;
  --color-border: #d4cfca;
  --color-primary: #1f3833;
  --color-primary-hover: #0f2219;
  --color-primary-contrast: #fdfcfb;
  --color-accent: #e8e4df;
  --color-link: #1f3833;
  --color-link-hover: #0f2219;

  /* Status Colors - Muted */
  --color-success: #4a7c59;
  --color-success-bg: #f3f7f4;
  --color-info: #5a7b8c;
  --color-info-bg: #f4f6f8;
  --color-warning: #9c7b4a;
  --color-warning-bg: #f8f6f2;
  --color-danger: #a35e5e;
  --color-danger-bg: #f8f4f4;

  /* Border Radius & Shadow */
  --border-radius: 0.375rem;
  --border-width: 1.5px;
  --border-width-bottom: 2px;
  --shadow-sm: 0 1px 2px 0 rgba(45, 45, 45, 0.04);
  --shadow: 0 2px 4px 0 rgba(45, 45, 45, 0.08);
  --shadow-lg: 0 8px 16px -4px rgba(45, 45, 45, 0.12);
  --shadow-modal: 0 0 2rem 0 rgba(45, 45, 45, 0.3);
}

/* ---------------------------------- */
/* 2. Base & Reset Styles             */
/* ---------------------------------- */

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

html {
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------------------------------- */
/* 3. Layout & Structure              */
/* ---------------------------------- */

main {
  display: block;
  flex-grow: 1;
  padding: 2rem 2rem;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

header, footer {
  padding: 1.25rem 2rem;
  background-color: var(--color-bg-secondary);
  border-bottom: var(--border-width) solid var(--color-border);
}

header > nav {
  margin: -1.25rem -2rem;
  padding: 0 2rem; 
  background-color: var(--color-primary);
  min-height: 4rem; 
  display: flex; 
  align-items: center; 
}

header > nav a {
  font-family: var(--font-sans);
  color: var(--color-primary-contrast);
  margin-right: 2rem; 
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  font-weight: 500;
}

header > nav a:last-child {
  margin-right: 0;
}

header > nav a:hover,
header > nav a:focus {
  color: var(--color-primary-contrast);
  border-bottom-color: rgba(253, 252, 251, 0.6); 
}

footer {
  border-bottom: none;
  border-top: var(--border-width) solid var(--color-border);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

section {
  margin-bottom: 2.5rem;
}

aside {
  padding: 1.5rem;
  margin: 2rem 0;
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--color-primary);
}

/* ---------------------------------- */
/* 4. Typography                      */
/* ---------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  margin: 2.5rem 0 1.25rem 0;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin: 0 0 1.25rem 0;
}

a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease;
}

a:hover, a:focus {
  color: var(--color-link-hover);
  border-bottom-color: var(--color-link-hover);
}

strong, b {
  font-weight: 600;
}

hr {
  border: none;
  border-top: var(--border-width) solid var(--color-border);
  margin: 2.5rem 0;
}

blockquote {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--color-primary);
  background-color: var(--color-bg-secondary);
  font-style: italic;
  color: var(--color-text-secondary);
}

pre, code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

pre {
  background-color: #3a3a3a;
  color: #f5f5f5;
  padding: 1.25rem 1.5rem;
  border-radius: var(--border-radius);
  overflow-x: auto;
  line-height: 1.6;
}

code {
  background-color: var(--color-accent);
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
}

pre code {
  background-color: transparent;
  padding: 0;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.2em 0.5em;
  background-color: var(--color-accent);
  border-radius: 0.25rem;
  border: var(--border-width) solid var(--color-border);
}

mark {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
  padding: 0.1em 0.4em;
  border-radius: 0.25rem;
}

/* ---------------------------------- */
/* 5. Forms                           */
/* ---------------------------------- */

input, select, textarea {
  display: block;
  width: 100%;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  transition: all 0.2s ease;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(61, 110, 92, 0.1);
}

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

fieldset {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

legend {
  font-family: var(--font-sans);
  font-weight: 600;
  padding: 0 0.5rem;
}

label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
}

/* Checkbox & Radio */
input[type="checkbox"], input[type="radio"] {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  margin: 0 0.75rem 0 0;
  vertical-align: middle;
  cursor: pointer;
  accent-color: var(--color-primary);
}

label > input[type="checkbox"], label > input[type="radio"] {
  margin-bottom: 0;
}

/* File Input styles */
input[type="file"] {
  padding: 0; 
}

input[type="file"]::file-selector-button {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
  padding: 0.75rem 1.25rem;
  margin-right: 1rem; 
  border: none;
  border-right: var(--border-width) solid var(--color-border);
  transition: all 0.2s ease;
  cursor: pointer;
}

input[type="file"]::file-selector-button:hover {
  background-color: var(--color-accent);
  color: var(--color-primary-hover);
}

button, input[type="submit"], input[type="reset"], input[type="button"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  margin-bottom: 1rem;
  cursor: pointer;
  border: var(--border-width) solid var(--color-primary);
  border-radius: var(--border-radius);
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  transition: all 0.2s ease;
  -webkit-appearance: none;
}

button:hover, input[type="submit"]:hover, input[type="reset"]:hover, input[type="button"]:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
}

button:disabled, input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Secondary Button Style */
input[type="reset"], input[type="button"], button[type="button"] {
  background-color: var(--color-bg);
  color: var(--color-primary);
  border-color: var(--color-border);
}

input[type="reset"]:hover, input[type="button"]:hover, button[type="button"]:hover {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
}

/* Progress */
progress {
  display: block;
  width: 100%;
  height: 0.75rem;
  margin-bottom: 1.25rem;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-secondary);
  overflow: hidden;
}

progress::-webkit-progress-bar {
  background-color: transparent;
}

progress::-webkit-progress-value {
  background-color: var(--color-primary);
}

/* ---------------------------------- */
/* 6. Lists                           */
/* ---------------------------------- */

ul, ol, dl {
  padding-left: 1.75rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

dt {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
}

dd {
  margin-left: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
}

/* ---------------------------------- */
/* 7. Media Elements                  */
/* ---------------------------------- */

img, figure, video {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

figure {
  margin: 0 0 1.5rem 0;
  padding: 0;
}

figcaption {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  text-align: center;
  margin-top: 0.75rem;
  font-style: italic;
}

iframe {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  width: 100%;
  box-shadow: var(--shadow-sm);
}

/* ---------------------------------- */
/* 8. Tables                          */
/* ---------------------------------- */

table {
  width: 100%;
  border-collapse: separate; 
  border-spacing: 0;
  text-align: left;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
}

thead th {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  border-bottom: var(--border-width) solid var(--color-border);
  padding: 0.875rem 1rem;
}

tbody td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* ---------------------------------- */
/* 9. Semantic Components             */
/* ---------------------------------- */

/* Card */
article {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background-color: var(--color-bg);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

article > header:first-child, article > footer:last-child {
  background-color: transparent;
  border: none;
  padding: 0;
}

article > header:first-child {
  margin-bottom: 1rem;
}

article > footer:last-child {
  margin-top: 1.5rem;
  border-top: var(--border-width) solid var(--color-border);
  padding-top: 1rem;
}

/* Modal */
dialog {
  padding: 0;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-modal);
  max-width: 500px;
  width: calc(100% - 2rem);
}

dialog::backdrop {
  background: rgba(45, 45, 45, 0.6);
  backdrop-filter: blur(4px);
}

dialog > header {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  padding: 1.25rem 1.5rem;
  border-bottom: var(--border-width) solid var(--color-border);
}

dialog > section {
  padding: 1.5rem;
  margin: 0;
}

dialog > footer {
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  border-top: var(--border-width) solid var(--color-border);
  background-color: var(--color-bg-secondary);
}

dialog > footer button {
  margin: 0;
}

dialog > button[aria-label="Close"] {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  padding: 0.5rem;
  line-height: 1;
}

/* Accordion / Details */
details {
  background-color: var(--color-bg-secondary);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

summary {
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  list-style: none; 
}

summary::-webkit-details-marker {
  display: none; 
}

summary::before {
  content: '→';
  margin-right: 0.625rem;
  display: inline-block;
  transition: transform 0.2s ease;
  color: var(--color-primary);
}

details[open] > summary::before {
  transform: rotate(90deg);
}

details > *:not(summary) {
  margin-top: 1rem;
}

/* ---------------------------------- */
/* 10. Optional Classes               */
/* ---------------------------------- */

/* Alerts */
.alert {
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  border-radius: var(--border-radius);
  border: var(--border-width) solid;
  background-color: var(--color-bg-secondary);
  border-color: var(--color-border);
}

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

.alert-info {
  background-color: var(--color-info-bg);
  border-color: var(--color-info);
  color: var(--color-info);
}

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

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

/* Stat Grid */
.stat-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stat-grid article {
  padding: 1.25rem 1.5rem;
}

.stat-grid p {
  font-family: var(--font-sans);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin: 0;
}

.stat-grid h3 {
  font-size: 2.25rem;
  margin: 0.5rem 0 0 0;
  color: var(--color-primary);
}