/* ============================================
   Memorlock.com — Core Stylesheet
   ============================================ */

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

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a2e;
  --color-text-light: #4a4a68;
  --color-accent: #1a7a6d;
  --color-accent-hover: #145f55;
  --color-accent-light: #e8f5f2;
  --color-border: #e2e2e8;
  --color-footer-bg: #f7f7fa;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-width: 720px;
  --nav-height: 60px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.5rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1.2rem;
  color: var(--color-text-light);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

ul, ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
  color: var(--color-text-light);
}

li {
  margin-bottom: 0.4rem;
}

strong {
  color: var(--color-text);
}

blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--color-accent-light);
  border-radius: 0 4px 4px 0;
}

blockquote p {
  margin-bottom: 0;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

main {
  padding-top: 2rem;
  padding-bottom: 3rem;
  min-height: calc(100vh - var(--nav-height) - 200px);
}

/* --- Navigation --- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.75rem;
  padding: 0;
  margin: 0;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-text-light);
  text-decoration: none;
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Mobile hamburger (CSS-only) */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  padding: 10px;
  margin-right: -10px;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background: var(--color-text);
  height: 2px;
  width: 24px;
  border-radius: 2px;
  position: relative;
  transition: all 0.3s ease;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: '';
  position: absolute;
}

.nav-toggle-label span::before {
  top: -7px;
}

.nav-toggle-label span::after {
  top: 7px;
}

.nav-toggle:checked + .nav-toggle-label span {
  background: transparent;
}

.nav-toggle:checked + .nav-toggle-label span::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle:checked + .nav-toggle-label span::after {
  transform: rotate(-45deg);
  top: 0;
}

@media (max-width: 640px) {
  .nav-toggle-label {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 1rem 1.25rem;
    gap: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  }

  .nav-links li {
    margin: 0;
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 0;
    font-size: 1rem;
  }

  .nav-toggle:checked ~ .nav-links {
    display: flex;
  }
}

/* --- Article / Content Styles --- */
.page-meta {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

/* Technique cards on homepage */
.technique-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.technique-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.25rem;
  transition: border-color 0.15s ease;
}

.technique-card:hover {
  border-color: var(--color-accent);
}

.technique-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.technique-card p {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.technique-card a {
  font-size: 0.9rem;
  font-weight: 500;
}

@media (max-width: 640px) {
  .technique-grid {
    grid-template-columns: 1fr;
  }
}

/* Tool list items */
.tool-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.tool-item:last-child {
  border-bottom: none;
}

.tool-item h3 {
  margin-top: 0;
}

/* Table for Major System */
.digit-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.digit-table th,
.digit-table td {
  border: 1px solid var(--color-border);
  padding: 0.6rem 0.9rem;
  text-align: left;
}

.digit-table th {
  background: var(--color-accent-light);
  font-weight: 600;
  color: var(--color-text);
}

.digit-table td {
  color: var(--color-text-light);
}

.digit-table tr:nth-child(even) td {
  background: #fafafa;
}

/* Callout boxes */
.callout {
  background: var(--color-accent-light);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.callout p {
  margin-bottom: 0.5rem;
}

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

/* --- Footer --- */
.site-footer {
  background: var(--color-footer-bg);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-content p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin: 0;
}

.footer-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  padding: 0;
  margin: 0;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

@media (max-width: 640px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  h1 {
    font-size: 1.6rem;
  }
}