/* =========================================================================
   Cloud Cost Optimization & FinOps Automation — design system
   Light, professional palette (teal + amber + slate).
   ========================================================================= */

:root {
  /* Palette */
  --c-bg: #f8fafc;
  --c-surface: #ffffff;
  --c-surface-2: #f1f5f9;
  --c-surface-3: #e2e8f0;
  --c-text: #0f172a;
  --c-text-muted: #475569;
  --c-text-soft: #64748b;
  --c-border: #e2e8f0;
  --c-border-strong: #cbd5e1;

  --c-primary: #0f766e;          /* teal-700 */
  --c-primary-hover: #115e59;
  --c-primary-soft: #ccfbf1;
  --c-accent: #f59e0b;           /* amber */
  --c-accent-hover: #d97706;
  --c-info: #0ea5e9;             /* sky */
  --c-success: #16a34a;
  --c-danger: #dc2626;
  --c-violet: #7c3aed;

  --c-inline-code-bg: #ecfeff;   /* soft cyan tint */
  --c-inline-code-text: #0e7490;

  /* Layout */
  --container-max: 1400px;
  --container-pad: clamp(1rem, 3vw, 2.5rem);
  --header-h: 72px;

  /* Type */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  /* Radius / shadows */
  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --r-xl: 22px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08);
  --shadow-lg: 0 20px 50px -20px rgba(15, 23, 42, .25);

  /* Motion */
  --t-fast: 150ms ease;
  --t-med: 250ms cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: clamp(15px, 0.45vw + 14px, 17px);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body > main { flex: 1 0 auto; }

img, svg { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--c-primary); color: #fff; padding: .6rem 1rem; z-index: 1000;
  border-radius: var(--r-sm);
}
.skip-link:focus { left: .5rem; top: .5rem; }

/* =========================================================================
   Header
   ========================================================================= */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .8rem;
  text-decoration: none; color: var(--c-text);
  font-weight: 700;
}
.brand-mark { width: 40px; height: 40px; display: inline-flex; }
.brand-mark .logo-svg { width: 40px; height: 40px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-title { font-size: 1.02rem; letter-spacing: -0.01em; }
.brand-sub { font-size: .78rem; color: var(--c-text-muted); font-weight: 500; }

.primary-nav ul {
  display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0; align-items: center;
}
.nav-link {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .55rem .9rem; border-radius: var(--r-md);
  color: var(--c-text-muted); text-decoration: none;
  font-weight: 600; font-size: .92rem;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.nav-link:hover { background: var(--c-surface-2); color: var(--c-text); transform: translateY(-1px); }
.nav-link.is-active {
  background: var(--c-primary-soft); color: var(--c-primary-hover);
}
.nav-icon { display: inline-flex; align-items: center; }

.nav-toggle {
  display: none; background: transparent; border: 1px solid var(--c-border-strong);
  width: 42px; height: 42px; border-radius: var(--r-md); cursor: pointer;
  padding: 0; align-items: center; justify-content: center; flex-direction: column; gap: 4px;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--c-text); border-radius: 2px; transition: transform var(--t-fast); }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--c-surface); border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity var(--t-med), transform var(--t-med);
  }
  .primary-nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .primary-nav ul { flex-direction: column; padding: .75rem var(--container-pad); align-items: stretch; }
  .nav-link { padding: .85rem 1rem; justify-content: flex-start; }
}

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  margin-top: 4rem;
  background: linear-gradient(180deg, var(--c-surface) 0%, #eef2f7 100%);
  border-top: 1px solid var(--c-border);
  padding: 3rem 0 2rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
.footer-brand { display: flex; gap: 1rem; align-items: flex-start; }
.footer-logo { width: 48px; height: 48px; display: inline-flex; }
.footer-logo .logo-svg { width: 48px; height: 48px; }
.footer-title { margin: 0; font-weight: 700; }
.footer-tagline { margin: .35rem 0 0; color: var(--c-text-muted); font-size: .92rem; }
.footer-nav h2 { font-size: .85rem; text-transform: uppercase; letter-spacing: .1em; color: var(--c-text-soft); margin: 0 0 .75rem; }
.footer-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .35rem; }
.footer-nav a { color: var(--c-text); text-decoration: none; border-bottom: 1px dashed transparent; transition: color var(--t-fast), border-color var(--t-fast); }
.footer-nav a:hover { color: var(--c-primary); border-bottom-color: var(--c-primary); }
.footer-meta { color: var(--c-text-soft); font-size: .85rem; }
.footer-meta p { margin: 0 0 .25rem; }
@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr; }
}

/* =========================================================================
   Headings / typography
   ========================================================================= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  line-height: 1.2;
  color: var(--c-text);
  letter-spacing: -0.015em;
  margin-top: 2rem;
  margin-bottom: 1rem;
}
.content-article h1 {
  font-size: clamp(2rem, 1.4vw + 1.6rem, 2.85rem);
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-info) 50%, var(--c-accent) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  margin-top: 1rem;
}
.content-article h2 {
  font-size: clamp(1.4rem, 0.7vw + 1.2rem, 1.85rem);
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}
.content-article h3 { font-size: clamp(1.15rem, 0.4vw + 1.05rem, 1.4rem); color: var(--c-primary-hover); }
.content-article h4 { font-size: 1.1rem; color: var(--c-text-muted); }

.content-article p {
  margin: 0 0 1.1rem;
  color: var(--c-text);
}
.content-article ul, .content-article ol {
  margin: 0 0 1.2rem;
  padding-left: 1.4rem;
}
.content-article li { margin-bottom: .35rem; }
.content-article strong { color: var(--c-text); font-weight: 700; }
.content-article em { color: var(--c-text-muted); }

.content-article blockquote {
  margin: 1.2rem 0;
  padding: .9rem 1.2rem;
  border-left: 4px solid var(--c-primary);
  background: var(--c-surface);
  border-radius: var(--r-md);
  color: var(--c-text-muted);
}

/* Anchor link inside headings */
.header-anchor {
  text-decoration: none;
  color: var(--c-border-strong);
  margin-right: .4rem;
  opacity: 0;
  transition: opacity var(--t-fast), color var(--t-fast);
}
h2:hover .header-anchor,
h3:hover .header-anchor,
h4:hover .header-anchor { opacity: 1; }
.header-anchor:hover { color: var(--c-primary); }

/* Links */
.content-article a {
  color: var(--c-primary);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--c-primary) 30%, transparent);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}
.content-article a:hover { color: var(--c-primary-hover); border-bottom-color: var(--c-primary-hover); }

/* =========================================================================
   Article layout
   ========================================================================= */
.site-main { padding: 2rem 0 4rem; }

.content-article {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.article-body {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  padding: clamp(1.25rem, 2.5vw, 2.5rem);
  box-shadow: var(--shadow-sm);
}

.related {
  background: linear-gradient(180deg, var(--c-surface) 0%, var(--c-primary-soft) 200%);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 1.25rem 1.5rem;
}
.related h2 { margin: 0 0 .75rem; font-size: 1rem; text-transform: uppercase; letter-spacing: .12em; color: var(--c-text-soft); }
.related-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .6rem; }
.related-list a {
  display: inline-block;
  padding: .45rem .85rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  text-decoration: none;
  color: var(--c-text);
  font-size: .9rem;
  transition: transform var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.related-list a:hover { transform: translateY(-2px); border-color: var(--c-primary); color: var(--c-primary); }

/* Breadcrumbs */
.breadcrumbs { font-size: .9rem; color: var(--c-text-soft); margin-bottom: .5rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: .35rem; list-style: none; margin: 0; padding: 0; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: .35rem; }
.breadcrumbs a { color: var(--c-text-muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-primary); }
.breadcrumbs .sep { color: var(--c-border-strong); }
.breadcrumbs [aria-current="page"] { color: var(--c-text); font-weight: 600; }

/* =========================================================================
   Code (inline + block) + copy button
   ========================================================================= */
:not(pre) > code {
  background: var(--c-inline-code-bg);
  color: var(--c-inline-code-text);
  padding: .1em .4em;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: .92em;
  border: none;
}

figure.code-block {
  position: relative;
  margin: 1.4rem 0;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: #fbfdfe;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
figure.code-block pre {
  margin: 0;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  background: transparent;
  font-family: var(--font-mono);
  font-size: .9rem;
  line-height: 1.55;
  color: var(--c-text);
}
.copy-btn {
  position: absolute;
  top: .55rem; right: .55rem;
  background: var(--c-surface);
  color: var(--c-text-muted);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  padding: .25rem .65rem;
  font-size: .78rem;
  cursor: pointer;
  z-index: 2;
  opacity: 0;
  transition: opacity var(--t-fast), background var(--t-fast), color var(--t-fast);
}
figure.code-block:hover .copy-btn,
.copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.copy-btn.is-copied { background: var(--c-success); color: #fff; border-color: var(--c-success); }

/* =========================================================================
   Tables
   ========================================================================= */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  margin: 1.4rem 0;
  background: var(--c-surface);
}
.content-article table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}
.content-article thead th {
  background: var(--c-surface-2);
  color: var(--c-text);
  text-align: left;
  font-weight: 600;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--c-border);
}
.content-article tbody td {
  padding: .65rem 1rem;
  border-bottom: 1px solid var(--c-border);
}
.content-article tbody tr:nth-child(even) { background: var(--c-surface-2); }
.content-article tbody tr:hover { background: var(--c-primary-soft); }

/* =========================================================================
   Task / checkbox lists
   ========================================================================= */
.content-article li.task-list-item {
  list-style: none;
  margin-left: -1.4rem;
  padding-left: 1.4rem;
  display: flex;
  align-items: flex-start;
  gap: .55rem;
  position: relative;
}
.content-article li.task-list-item::marker { content: ""; }
.content-article li.task-list-item .task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 18px; height: 18px;
  margin-top: .35em;
  border: 2px solid var(--c-border-strong);
  border-radius: 4px;
  background: var(--c-surface);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
  position: relative;
}
.content-article li.task-list-item .task-checkbox:hover { border-color: var(--c-primary); }
.content-article li.task-list-item .task-checkbox:checked {
  background: var(--c-primary);
  border-color: var(--c-primary);
}
.content-article li.task-list-item .task-checkbox:checked::after {
  content: "";
  position: absolute;
  left: 4px; top: 0;
  width: 5px; height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.content-article li.task-list-item.is-checked,
.content-article li.task-list-item:has(.task-checkbox:checked) {
  color: var(--c-text-soft);
  text-decoration: line-through;
  text-decoration-color: var(--c-text-soft);
}

/* =========================================================================
   FAQ accordions
   ========================================================================= */
.faq-accordion { display: flex; flex-direction: column; gap: .6rem; margin: 1rem 0 1.5rem; }
.faq-item {
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-surface);
  overflow: hidden;
  transition: box-shadow var(--t-fast);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.2rem;
  font-weight: 600;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
  color: var(--c-text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem; line-height: 1;
  color: var(--c-primary);
  transition: transform var(--t-med);
}
.faq-item[open] summary::after { content: "−"; }
.faq-answer {
  padding: 0 1.2rem 1rem;
  color: var(--c-text-muted);
}
.faq-answer p:last-child { margin-bottom: 0; }

/* =========================================================================
   Mermaid
   ========================================================================= */
.mermaid {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  padding: 1.25rem;
  margin: 1.4rem 0;
  text-align: center;
  overflow-x: auto;
}

/* =========================================================================
   Home page
   ========================================================================= */
.home {
  padding: 2rem 0;
}
.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}
.hero-logo {
  width: clamp(120px, 18vw, 200px);
  height: clamp(120px, 18vw, 200px);
  margin: 0 auto 1.5rem;
  display: block;
  filter: drop-shadow(0 20px 30px rgba(15, 118, 110, .2));
  animation: float 8s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.hero-title {
  font-size: clamp(2.1rem, 2.5vw + 1.4rem, 3.6rem);
  margin: 0 0 1rem;
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-info) 50%, var(--c-accent) 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.hero-lede {
  font-size: clamp(1.05rem, 0.5vw + 1rem, 1.25rem);
  color: var(--c-text-muted);
  max-width: 920px;
  margin: 0 auto 2rem;
}

.cta-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: .9rem;
  margin: 2rem 0 3rem;
}
.cta {
  display: inline-flex; align-items: center; gap: .65rem;
  padding: .85rem 1.4rem;
  border-radius: 999px;
  background: var(--c-surface);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  text-decoration: none;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-med), box-shadow var(--t-med), border-color var(--t-fast);
}
.cta:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--c-primary); }
.cta-icon {
  display: inline-flex;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--cta-bg, var(--c-primary-soft));
  color: var(--cta-fg, var(--c-primary));
  align-items: center; justify-content: center;
}
.cta-icon svg { width: 16px; height: 16px; }
.cta--primary {
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary-hover) 100%);
  color: #fff;
  border-color: transparent;
}
.cta--primary:hover { color: #fff; border-color: transparent; }
.cta--primary .cta-icon { background: rgba(255,255,255,.18); color: #fff; }

.home-intro {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 0;
}
.home-intro p {
  font-size: clamp(1rem, 0.3vw + 1rem, 1.12rem);
  color: var(--c-text);
  margin: 0 0 1.1rem;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 1.25rem;
  margin: 3rem 0 2rem;
}
.section-card {
  display: flex; flex-direction: column; gap: .8rem;
  padding: 1.5rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: var(--c-text);
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-med), box-shadow var(--t-med), border-color var(--t-fast);
}
.section-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary);
}
.section-card .card-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--card-bg, var(--c-primary-soft));
  color: var(--card-fg, var(--c-primary));
  display: inline-flex; align-items: center; justify-content: center;
}
.section-card .card-icon svg { width: 26px; height: 26px; }
.section-card h3 { margin: 0; font-size: 1.15rem; color: var(--c-text); }
.section-card p { margin: 0; color: var(--c-text-muted); font-size: .95rem; }
.section-card .read-more {
  margin-top: auto;
  font-weight: 600;
  color: var(--c-primary);
  display: inline-flex; align-items: center; gap: .4rem;
}

/* =========================================================================
   Print
   ========================================================================= */
@media print {
  .site-header, .site-footer, .copy-btn { display: none; }
  body { background: #fff; }
  .article-body { box-shadow: none; border: 0; }
}