/* ============================================
   Portfolio — Gabriela Divišová
   Design system: Montserrat + DM Sans
   ============================================ */

/* --- Fonts (Google Fonts fallback) --- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,700;1,9..40,400&family=Montserrat:wght@300;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
  /* Colors */
  --bg: #fafafa;
  --fg: #17191c;
  --muted: #6e737c;
  --body: #555555;
  --soft: #888888;
  --separator: #cccccc;
  --card-bg: #ffffff;
  --border: #e5e7eb;
  --btn-bg: #111111;

  /* Accent colors for case studies */
  --cs-cyan: #0097b2;
  --cs-amber: #e69902;
  --cs-coral: #ef5b5b;

  /* Contact section */
  --contact-bg: #17191c;
  --contact-text: #fafafa;

  /* Typography */
  --font-display: 'Montserrat', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  /* Layout */
  --max-width: 72rem; /* 1152px */
  --nav-height: 61px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.625;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* --- Dot Grid Background --- */
.dot-grid {
  position: relative;
  background-image: radial-gradient(circle, #d4d4d4 1px, transparent 1px);
  background-size: 24px 24px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-height);
  padding: 16px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  transition: opacity 0.2s;
}

.nav-logo:hover {
  opacity: 0.7;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--fg);
}

.nav-links a.lang {
  font-weight: 500;
}

/* Adjust mobile nav spacing */
@media (max-width: 767px) {
  .nav {
    padding: 16px 24px;
  }
  .nav-links {
    gap: 16px;
  }
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 0px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: #fafafa;
}

.hero-inner {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 3fr 2fr;
    gap: 48px;
  }
}

@media (max-width: 767px) {
  .hero-inner {
    padding: 0 24px 40px;
  }
}

/* --- Typography --- */
h1 {
  font-family: var(--font-display);
  line-height: 0.88;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

h1 .first-name {
  display: block;
  font-size: clamp(2.8rem, 5.5vw, 4.5rem);
  font-weight: 800;
  color: var(--fg);
}

h1 .last-name {
  display: block;
  font-size: clamp(3.2rem, 6.5vw, 5.2rem);
  font-weight: 300;
  color: rgba(23, 25, 28, 0.82);
  letter-spacing: -0.01em;
}

/* Hero subtitle */
.hero-subtitle {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.625;
  color: var(--soft);
  margin-bottom: 2rem;
}

.hero-subtitle .sep {
  color: var(--separator);
  margin: 0 0.6rem;
}

/* Hero description */
.hero-desc {
  max-width: 28rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-desc p {
  font-size: 1rem;
  line-height: 1.625;
  color: var(--body);
  text-align: justify;
}

/* --- Buttons --- */
.btn-primary {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 9999px;
  background: var(--btn-bg);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: opacity 0.2s;
}

.btn-primary:hover {
  opacity: 0.75;
}

.btn-outline-light {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: 9999px;
  border: 1px solid rgba(250, 250, 250, 0.25);
  color: var(--contact-text);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background 0.2s;
}

.btn-outline-light:hover {
  background: rgba(250, 250, 250, 0.1);
}

.btn-light {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  border-radius: 9999px;
  background: var(--contact-text);
  color: var(--fg);
  font-size: 0.875rem;
  font-weight: 600;
  transition: opacity 0.2s;
}

.btn-light:hover {
  opacity: 0.9;
}

/* --- Section Headings --- */
.section-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-bottom: 1rem;
}

/* --- Case Studies Section --- */
.case-studies {
  padding: 80px 48px 112px;
  max-width: var(--max-width);
  margin: 0 auto;
}

@media (max-width: 767px) {
  .case-studies {
    padding: 40px 24px 80px;
  }
}

.case-studies-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Individual case study card */
.case-card {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  transition: box-shadow 0.3s;
  cursor: pointer;
  display: block;
}

.case-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.case-card-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px 32px;
}

@media (min-width: 768px) {
  .case-card-inner {
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .case-card-inner {
    padding: 20px;
    gap: 16px;
  }
}

.case-number {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1;
  flex-shrink: 0;
  user-select: none;
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: -0.03em;
  opacity: 0.2;
}

.case-content {
  flex: 1;
  min-width: 0;
}

.case-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.case-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.case-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.25;
}

.case-desc {
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.5;
}

.case-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  transition: transform 0.3s;
}

.case-card:hover .case-arrow {
  transform: translateX(2px);
}

/* Case card accent border (left) + bottom hover bar */
.case-card .accent-bar {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.case-card .hover-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.3s;
}

.case-card:hover .hover-bar {
  opacity: 1;
}

/* --- Case Study Colors --- */
.cs-cyan {
  color: var(--cs-cyan);
}
.bg-cyan {
  background: var(--cs-cyan);
}
.border-cyan {
  border-left-color: var(--cs-cyan);
}

.cs-amber {
  color: var(--cs-amber);
}
.bg-amber {
  background: var(--cs-amber);
}
.border-amber {
  border-left-color: var(--cs-amber);
}

.cs-coral {
  color: var(--cs-coral);
}
.bg-coral {
  background: var(--cs-coral);
}
.border-coral {
  border-left-color: var(--cs-coral);
}

/* --- Contact Section --- */
.contact {
  position: relative;
  overflow: hidden;
  background: var(--contact-bg);
  color: var(--contact-text);
  padding: 96px 48px 144px;
}

@media (max-width: 767px) {
  .contact {
    padding: 60px 24px 80px;
  }
}

.contact-inner {
  position: relative;
  z-index: 10;
  max-width: var(--max-width);
  margin: 0 auto;
}

.contact-title {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 2rem;
}

.contact-text {
  color: rgba(250, 250, 250, 0.6);
  font-size: 1.125rem;
  line-height: 1.625;
  max-width: 28rem;
  margin-bottom: 2rem;
}

.contact-bring {
  margin-bottom: 2.5rem;
}

.contact-bring-label {
  color: rgba(250, 250, 250, 0.5);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
}

.contact-bring-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-bring-list li {
  display: flex;
  gap: 12px;
  color: rgba(250, 250, 250, 0.7);
  font-size: 0.875rem;
  line-height: 1.625;
}

.contact-bring-list li .dot {
  margin-top: 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: hsl(36, 98%, 54%);
  flex-shrink: 0;
}

.contact-buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 640px) {
  .contact-buttons {
    flex-direction: row;
  }
}

.contact-btn-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* --- Footer --- */
.contact-footer {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid rgba(250, 250, 250, 0.1);
  display: flex;
  flex-direction: column;
  gap: 16px;
  color: rgba(250, 250, 250, 0.35);
  font-size: 0.75rem;
}

@media (min-width: 768px) {
  .contact-footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* ============================================
   Case Study Page Styles
   ============================================ */

.cs-page {
  padding-top: var(--nav-height);
}

.cs-back {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 48px 0;
}

@media (max-width: 767px) {
  .cs-back {
    padding: 16px 24px 0;
  }
}

.cs-back a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--muted);
  transition: color 0.2s;
}

.cs-back a:hover {
  color: var(--fg);
}

.cs-back a svg {
  width: 14px;
  height: 14px;
}

.cs-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 48px 0;
  position: relative;
}

@media (max-width: 767px) {
  .cs-header {
    padding: 12px 24px 0;
  }
}

.cs-number-deco {
  position: absolute;
  right: 48px;
  top: -20px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(6rem, 15vw, 12rem);
  line-height: 1;
  letter-spacing: -0.03em;
  opacity: 0.06;
  user-select: none;
  pointer-events: none;
}

@media (max-width: 767px) {
  .cs-number-deco {
    right: 24px;
  }
}

.cs-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.cs-meta {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.cs-quote {
  font-style: italic;
  color: var(--body);
  max-width: 42rem;
  margin-bottom: 3rem;
  line-height: 1.7;
  border-left: 3px solid var(--separator);
  padding-left: 1.25rem;
}

/* --- Stats Cards (Shrnutí v číslech) — clean inline --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 3rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 0;
}

.stat-number {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.stat-desc {
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--body);
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Case Study Content --- */
.cs-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px 64px;
}

@media (max-width: 767px) {
  .cs-content {
    padding: 0 24px 48px;
  }
}

.cs-section {
  margin-bottom: 3rem;
}

.cs-section h2 {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted);
  margin-bottom: 1rem;
}

.cs-section p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--body);
  margin-bottom: 1rem;
}

.cs-section ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 1.5rem;
}

.cs-section ul li {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--body);
  padding-left: 1.5rem;
  position: relative;
}

.cs-section ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.cs-section ul li strong {
  font-weight: 600;
  color: var(--fg);
}

/* --- Sample Grids --- */
.sample-block {
  margin-bottom: 2.5rem;
}

.sample-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
  margin-bottom: 1rem;
}

.sample-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .sample-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

@media (min-width: 768px) {
  .sample-grid-three {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 3-column grid (3x2) — for 4-image samples */
@media (min-width: 768px) {
  .sample-grid-three-by-two {
    grid-template-columns: repeat(3, 1fr);
  }
}
.sample-empty {
  visibility: hidden;
}

/* Custom duo layout: one+two stacked */
.sample-duo {
  display: grid;
  gap: 16px;
}

@media (min-width: 768px) {
  .sample-duo {
    grid-template-columns: 1.3fr 1fr;
  }
}

.sample-duo-secondary {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.sample-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sample-item img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.sample-item img:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.sample-item .caption {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.4;
}

/* --- Reflection Box --- */
.reflection-box {
  background: #f2f2f4;
  border-radius: 12px;
  padding: 24px 32px;
  margin-top: 2rem;
}

.reflection-box .reflection-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.reflection-box p {
  font-style: italic;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--body);
  margin-bottom: 0;
}

/* --- Case Study Pagination (footer) --- */
.cs-pagination {
  background: var(--fg);
  color: var(--contact-text);
  padding: 48px;
}

@media (max-width: 767px) {
  .cs-pagination {
    padding: 32px 24px;
  }
}

.cs-pagination-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 32px;
}

@media (min-width: 768px) {
  .cs-pagination-inner {
    flex-direction: row;
    align-items: center;
  }
}

.cs-prev {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(250, 250, 250, 0.5);
  font-size: 0.875rem;
  transition: color 0.2s;
}

.cs-prev:hover {
  color: var(--contact-text);
}

.cs-next-block {
  text-align: right;
}

.cs-next-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(250, 250, 250, 0.4);
  margin-bottom: 0.5rem;
}

.cs-next-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

/* --- Animations --- */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.6s ease-out forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- SVG Icons inline --- */
.icon-arrow-right {
  width: 16px;
  height: 16px;
}

.icon-arrow-left {
  width: 14px;
  height: 14px;
}

.icon-mail {
  width: 15px;
  height: 15px;
}

.icon-linkedin {
  width: 15px;
  height: 15px;
}

/* --- Lightbox --- */
.lightbox-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  cursor: pointer;
  overflow: auto;
  padding: 32px;
  text-align: center;
}

.lightbox-overlay.active {
  display: block;
}

.lightbox-overlay img {
  display: inline-block;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  cursor: default;
  margin: 0 auto;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 28px;
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s;
  background: none;
  border: none;
  font-family: var(--font-body);
}

.lightbox-close:hover {
  opacity: 1;
}

/* --- Utility --- */
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }