/* Cong Cloud Stack — Personal Website — app.css */

/* ── CSS Variables (light theme) ──────────────────────────────────────────── */
:root {
  --bg:           #ffffff;
  --bg-alt:       #f8f9fa;
  --bg-card:      #ffffff;
  --bg-card-alt:  #f1f3f5;
  --border:       #dee2e6;
  --accent:       #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --success:      #16a34a;
  --danger:       #dc2626;
  --warning:      #ca8a04;
  --muted:        #6b7280;
  --text:         #111827;
  --text-dim:     #4b5563;
  --radius:       0.5rem;
  --radius-sm:    0.25rem;
  --radius-lg:    1rem;
  --shadow:       0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md:    0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg:    0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --transition:   0.2s ease;
  --font-mono:    ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}

/* ── Dark mode ─────────────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:           #0f1117;
    --bg-alt:       #161b22;
    --bg-card:      #1c2128;
    --bg-card-alt:  #21262d;
    --border:       #30363d;
    --accent:       #58a6ff;
    --accent-hover: #79b8ff;
    --accent-light: #0d2149;
    --success:      #3fb950;
    --danger:       #f85149;
    --warning:      #d29922;
    --muted:        #8b949e;
    --text:         #e6edf3;
    --text-dim:     #8b949e;
    --shadow:       0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md:    0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.25);
    --shadow-lg:    0 10px 15px rgba(0, 0, 0, 0.4), 0 4px 6px rgba(0, 0, 0, 0.3);
  }
}

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

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text);
}

p {
  margin-bottom: 1rem;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.1em 0.4em;
}

pre {
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--text-dim);
  font-style: italic;
  margin-bottom: 1rem;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.25rem;
}

/* ── Layout ─────────────────────────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

.container-narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

main {
  flex: 1;
  padding: 2.5rem 0 4rem;
}

.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.page-header p {
  font-size: 1.1rem;
  color: var(--text-dim);
  margin-bottom: 0;
}

/* ── Navigation ─────────────────────────────────────────────────────────────── */
nav {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 3.5rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links a {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

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

/* Hamburger button (mobile) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.5rem;
  height: 1.125rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 0.3rem;
}

.nav-hamburger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Mobile nav menu */
.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1.25rem 1rem;
  gap: 0.25rem;
}

.nav-mobile a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--transition), background var(--transition);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  color: var(--accent);
  background: var(--accent-light);
}

.nav-mobile.open {
  display: flex;
}

@media (max-width: 639px) {
  .nav-links {
    display: none;
  }
  .nav-hamburger {
    display: flex;
  }
}

/* ── Hero (home page) ───────────────────────────────────────────────────────── */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Section headings ───────────────────────────────────────────────────────── */
.section-heading {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

.section-heading a {
  font-size: 0.9rem;
  font-weight: 500;
  float: right;
  margin-top: 0.25rem;
}

.home-section {
  margin-bottom: 3.5rem;
}

/* ── Blog card grid ─────────────────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 640px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

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

.blog-card-date {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.blog-card h2 {
  font-size: 1.1rem;
  line-height: 1.4;
}

.blog-card h2 a {
  color: var(--text);
  text-decoration: none;
}

.blog-card h2 a:hover {
  color: var(--accent);
}

.blog-card-summary {
  font-size: 0.9rem;
  color: var(--text-dim);
  flex: 1;
  line-height: 1.6;
}

.blog-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent);
  letter-spacing: 0.02em;
}

/* ── Blog post page ─────────────────────────────────────────────────────────── */
.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h1 { font-size: 1.75rem; margin: 2rem 0 0.75rem; }
.post-content h2 { font-size: 1.4rem;  margin: 1.75rem 0 0.75rem; }
.post-content h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }

/* ── Portfolio card grid ────────────────────────────────────────────────────── */
.portfolio-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.portfolio-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

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

.portfolio-card h2 {
  font-size: 1.2rem;
}

.portfolio-card h2 a {
  color: var(--text);
  text-decoration: none;
}

.portfolio-card h2 a:hover {
  color: var(--accent);
}

.portfolio-card-summary {
  font-size: 0.9rem;
  color: var(--text-dim);
  flex: 1;
}

.portfolio-card-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: auto;
}

/* ── Linktree ───────────────────────────────────────────────────────────────── */
.linktree-wrapper {
  max-width: 480px;
  margin: 0 auto;
  padding: 2rem 0;
}

.linktree-avatar {
  width: 5rem;
  height: 5rem;
  border-radius: 50%;
  margin: 0 auto 1rem;
  object-fit: cover;
  border: 3px solid var(--border);
}

.linktree-name {
  font-size: 1.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.25rem;
}

.linktree-bio {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.linktree-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
}

.linktree-list li a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.875rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: border-color var(--transition), background var(--transition),
              box-shadow var(--transition), transform var(--transition);
}

.linktree-list li a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
}

/* ── Contact form ───────────────────────────────────────────────────────────── */
.contact-wrapper {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  margin-bottom: 1.25rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  line-height: 1.5;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 480px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-notice {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

/* Form feedback messages */
.form-success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius);
  padding: 0.875rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
}

.form-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
  border-radius: var(--radius);
  padding: 0.875rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.25rem;
}

@media (prefers-color-scheme: dark) {
  .form-success {
    background: #052e16;
    color: #86efac;
    border-color: #166534;
  }
  .form-error {
    background: #2d0a0a;
    color: #fca5a5;
    border-color: #991b1b;
  }
}

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), box-shadow var(--transition);
  line-height: 1.5;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--accent-light);
  text-decoration: none;
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border-color: var(--border);
}

.btn-ghost:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

.btn-full {
  width: 100%;
}

.btn-lg {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

/* htmx loading state */
.htmx-indicator {
  display: none;
}
.htmx-request .htmx-indicator {
  display: inline-block;
}
.htmx-request.htmx-indicator {
  display: inline-block;
}

/* ── Booking page ───────────────────────────────────────────────────────────── */
.booking-frame {
  width: 100%;
  min-height: 700px;
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.booking-fallback {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-dim);
}

/* ── Empty state ────────────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--muted);
}

.empty-state h2 {
  font-size: 1.25rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */
footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  padding: 0;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--muted);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Utility ────────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted  { color: var(--muted); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* ── Responsive helpers ─────────────────────────────────────────────────────── */
@media (max-width: 639px) {
  .hide-mobile { display: none !important; }
  .container { padding: 0 1rem; }
  main { padding: 1.5rem 0 3rem; }
  .hero { padding: 2.5rem 0 2rem; }
  .contact-form { padding: 1.25rem; }
}