/* =============================================================================
   style.css — Milan Baskota portfolio
   One file, mobile-first, organized into clearly labeled sections:
     1. Font imports
     2. Design tokens (CSS variables)
     3. Reset & base
     4. Accessibility helpers (skip link, focus states, reduced motion)
     5. Layout primitives (container, section)
     6. Header & navigation
     7. Buttons & tags
     8. Hero (+ signature terminal card)
     9. Cards (project cards, generic cards)
    10. Skills page (progress bars)
    11. Contact page (form + validation states)
    12. Footer
    13. 404 page
    14. Responsive breakpoints
   ========================================================================== */

/* -----------------------------------------------------------------------
   1. Font imports
   Space Grotesk = display/headings, Inter = body, IBM Plex Mono = the one
   signature "technical label" typeface, used sparingly (tags, eyebrows,
   the terminal card, filter buttons).
   ----------------------------------------------------------------------- */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap");

/* -----------------------------------------------------------------------
   2. Design tokens
   ----------------------------------------------------------------------- */
:root {
  /* Color */
  --color-bg: #f9fafb;
  --color-bg-alt: #f3f4f6;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-text-muted: #4b5563;
  --color-border: #e5e7eb;
  --color-accent: #4f46e5;
  --color-accent-hover: #4338ca;
  --color-accent-soft: #eef2ff;
  --color-success: #15803d;
  --color-success-bg: #f0fdf4;
  --color-error: #b91c1c;
  --color-error-bg: #fef2f2;

  /* Type */
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  /* Spacing scale (rem) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 6rem;

  /* Layout */
  --max-width: 1120px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.04);
  --shadow-md: 0 4px 16px rgba(17, 24, 39, 0.06);
  --shadow-lg: 0 12px 32px rgba(17, 24, 39, 0.10);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* -----------------------------------------------------------------------
   3. Reset & base
   ----------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-4);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 var(--space-4); color: var(--color-text-muted); }

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

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

ul, ol { padding-left: 1.25rem; }

/* -----------------------------------------------------------------------
   4. Accessibility helpers
   ----------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  z-index: 1000;
  background: var(--color-text);
  color: #fff;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-4);
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

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

/* -----------------------------------------------------------------------
   5. Layout primitives
   ----------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-8);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section-heading {
  margin-bottom: var(--space-6);
}

.section-heading .eyebrow {
  display: block;
  margin-bottom: var(--space-2);
}

.section-heading p {
  max-width: 60ch;
}

/* -----------------------------------------------------------------------
   6. Header & navigation
   ----------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249, 250, 251, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}
.nav-logo:hover { color: var(--color-text); text-decoration: none; }
.nav-logo span { color: var(--color-accent); }

.nav-links {
  display: none;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding-block: var(--space-2);
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.nav-toggle svg { width: 20px; height: 20px; }

.nav-links.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-5) var(--space-5);
  gap: var(--space-3);
  box-shadow: var(--shadow-md);
}

/* -----------------------------------------------------------------------
   7. Buttons & tags
   ----------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.btn:hover { text-decoration: none; }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-hover);
  border: 1px solid #e0e7ff;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-3) 0 var(--space-4);
}

/* Filter buttons on the Projects page */
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.filter-btn[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

/* -----------------------------------------------------------------------
   8. Hero + signature terminal card
   ----------------------------------------------------------------------- */
.hero {
  padding-block: var(--space-9) var(--space-8);
}

.hero-grid {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}

.hero-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-success);
  background: var(--color-success-bg);
  border: 1px solid #bbf7d0;
  padding: var(--space-2) var(--space-3);
  border-radius: 999px;
  margin-bottom: var(--space-5);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-location {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--space-6);
}

/* The "terminal card" — the page's signature element. It shows a small,
   real-feeling API response, echoing the actual Notices REST API project
   described on the Projects page, instead of a generic decorative graphic. */
.terminal-card {
  background: #111827;
  color: #e5e7eb;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.terminal-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: #1f2937;
  border-bottom: 1px solid #374151;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal-dot--red { background: #f87171; }
.terminal-dot--yellow { background: #fbbf24; }
.terminal-dot--green { background: #34d399; }

.terminal-card-title {
  margin-left: var(--space-2);
  color: #9ca3af;
  font-size: 0.78rem;
}

.terminal-card-body {
  padding: var(--space-5);
  line-height: 1.7;
  overflow-x: auto;
}

.terminal-prompt::before {
  content: "$ ";
  color: #34d399;
}

.terminal-response {
  color: #93c5fd;
  white-space: pre;
  margin-top: var(--space-3);
}

/* -----------------------------------------------------------------------
   9. Cards (project cards, generic content cards)
   ----------------------------------------------------------------------- */
.card-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.card h3 { margin-bottom: var(--space-2); }

.card p { font-size: 0.95rem; }

.card-placeholder-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fde68a;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  align-self: flex-start;
  margin-bottom: var(--space-3);
}

.card-links {
  margin-top: auto;
  padding-top: var(--space-4);
  display: flex;
  gap: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* -----------------------------------------------------------------------
   10. Skills page
   ----------------------------------------------------------------------- */
.skills-category {
  margin-bottom: var(--space-7);
}

.skill-row {
  margin-bottom: var(--space-4);
}

.skill-row-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}

.skill-row-label .skill-name { font-weight: 500; color: var(--color-text); }
.skill-row-label .skill-level { font-family: var(--font-mono); color: var(--color-text-muted); }

.skill-bar-track {
  height: 8px;
  border-radius: 999px;
  background: var(--color-border);
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--color-accent);
  width: 0%; /* set inline by JS to the real percentage */
  transition: width 900ms ease;
}

.learning-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.learning-list li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

.resume-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  text-align: center;
}

/* -----------------------------------------------------------------------
   11. Contact page
   ----------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  gap: var(--space-7);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-field label {
  font-weight: 500;
  font-size: 0.9rem;
}

.form-field input,
.form-field textarea {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.form-field input[aria-invalid="true"],
.form-field textarea[aria-invalid="true"] {
  border-color: var(--color-error);
}

.form-error {
  font-size: 0.82rem;
  color: var(--color-error);
  min-height: 1.2em;
}

.form-status {
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  display: none;
}

.form-status.is-success {
  display: block;
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid #bbf7d0;
}

.form-status.is-error {
  display: block;
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid #fecaca;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-link-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
}

.contact-link-card:hover {
  border-color: var(--color-accent);
  text-decoration: none;
}

.contact-link-card .label {
  color: var(--color-text);
  font-weight: 600;
  display: block;
}

.contact-link-card .value {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

/* -----------------------------------------------------------------------
   12. Footer
   ----------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-6);
  margin-top: var(--space-8);
}

.footer-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: flex-start;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
}

/* -----------------------------------------------------------------------
   13. 404 page
   ----------------------------------------------------------------------- */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-4);
}

/* -----------------------------------------------------------------------
   14. Responsive breakpoints
   ----------------------------------------------------------------------- */
@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 860px) {
  .nav-links {
    display: flex;
    position: static;
    background: none;
    border: none;
    box-shadow: none;
    padding: 0;
    flex-direction: row;
  }
  .nav-toggle { display: none; }

  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .contact-grid {
    grid-template-columns: 1.3fr 1fr;
  }
}

@media (min-width: 980px) {
  .card-grid--projects { grid-template-columns: repeat(3, 1fr); }
}