/* ==========================================================================
   PORTO - Design Tokens & Stylesheet
   Follows DESIGN.md specifications
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (Light Theme by Default)
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #EAF1F5;
  --color-surface: #F9F7F2;
  --color-surface-secondary: #DCE8ED;
  --color-text: #26343D;
  --color-muted: #6E7E87;
  --color-accent: #7894A9;
  --color-accent-hover: #5d7c92;
  --color-border: #D1DDE1;
  --color-success: #679277;
  --color-amber: #C98845;

  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Georgia', 'Times New Roman', serif;

  --container-width: 1120px;
  --page-gutter: 24px;
  --radius-card: 20px;
  --radius-control: 999px;
  --shadow-soft: 0 22px 65px rgba(54, 79, 92, 0.12);
  --shadow-subtle: 0 10px 30px rgba(54, 79, 92, 0.07);

  --header-height: 72px;
  --transition-speed: 250ms;
}

/* --------------------------------------------------------------------------
   2. Dark Theme Tokens
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --color-bg: #17242D;
  --color-surface: #22333E;
  --color-surface-secondary: #2B414D;
  --color-text: #EDF2F1;
  --color-muted: #AFBEC4;
  --color-accent: #8DA9BD;
  --color-accent-hover: #ADC4D4;
  --color-border: #40535D;
  --color-success: #7EB894;
  --color-amber: #D8A56E;

  --shadow-soft: 0 22px 65px rgba(0, 0, 0, 0.45);
  --shadow-subtle: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

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

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  overflow-x: hidden;
  position: relative;
}

/* Subtle background atmospheric gradient & grain */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 550px;
  background: radial-gradient(circle at 50% 0%, rgba(220, 232, 237, 0.55), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

[data-theme="dark"] body::before {
  background: radial-gradient(circle at 50% 0%, rgba(43, 65, 77, 0.6), transparent 70%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

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

button {
  font-family: inherit;
  border: none;
  cursor: pointer;
  background: none;
}

/* Accessible focus ring */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Section scroll-margin to prevent header overlap */
section[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* --------------------------------------------------------------------------
   4. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

.section-wrapper {
  padding-block: 80px;
  position: relative;
}

@media (max-width: 768px) {
  .section-wrapper {
    padding-block: 56px;
  }
}

/* --------------------------------------------------------------------------
   5. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, .font-heading {
  font-family: var(--font-heading);
  font-weight: normal;
  color: var(--color-text);
  line-height: 1.15;
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.eyebrow-pill {
  padding: 6px 14px;
  background-color: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  width: fit-content;
}

.section-header {
  margin-bottom: 48px;
}

.section-header .eyebrow {
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2.25rem, 5vw, 3.45rem);
  letter-spacing: -0.01em;
}

.section-subtitle {
  color: var(--color-muted);
  font-size: 1rem;
  max-width: 580px;
  margin-top: 12px;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   6. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(234, 241, 245, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

[data-theme="dark"] .site-header {
  background-color: rgba(23, 36, 45, 0.88);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: bold;
  letter-spacing: -0.03em;
  display: inline-flex;
  align-items: baseline;
}

.site-logo span {
  color: var(--color-accent);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-muted);
  position: relative;
  padding-block: 6px;
  transition: color var(--transition-speed) ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Status indicator badge */
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-muted);
  padding: 6px 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
}

.status-dot {
  width: 7px;
  height: 7px;
  background-color: var(--color-success);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(103, 146, 119, 0.2);
  animation: pulse-dot 2.5s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.8; }
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition-speed) ease;
}

.theme-toggle-btn:hover {
  background-color: var(--color-surface-secondary);
  border-color: var(--color-accent);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

/* Mobile Hamburger Button */
.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

/* Mobile Navigation Overlay / Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(23, 36, 45, 0.6);
  backdrop-filter: blur(6px);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
}

.mobile-nav-drawer.open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-panel {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transform: translateY(-20px);
  transition: transform var(--transition-speed) ease;
}

.mobile-nav-drawer.open .mobile-nav-panel {
  transform: translateY(0);
}

.mobile-nav-link {
  font-size: 1.125rem;
  font-weight: 500;
  padding-block: 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   7. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 48px;
  padding-bottom: 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-headline {
  font-size: clamp(3.2rem, 7vw, 5.5rem);
  letter-spacing: -0.02em;
  margin-block: 4px 0;
}

.hero-role {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 520px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-control);
  transition: all var(--transition-speed) ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #F9F7F2;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(120, 148, 169, 0.3);
}

.btn-outline {
  background-color: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-surface-secondary);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.hero-meta-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.meta-pill {
  font-size: 0.8125rem;
  color: var(--color-muted);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 6px 14px;
  border-radius: var(--radius-control);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.illustration-card {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.illustration-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 28px 75px rgba(54, 79, 92, 0.18);
}

/* --------------------------------------------------------------------------
   8. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.about-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.about-text-content {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-profile-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 6px;
}

.about-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--color-surface-secondary);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-accent);
  font-weight: bold;
}

.about-profile-info h3 {
  font-size: 1.35rem;
  font-weight: 600;
}

.about-profile-info p {
  color: var(--color-muted);
  font-size: 0.875rem;
}

.about-paragraph {
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.7;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.fact-item {
  background-color: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.fact-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--color-muted);
}

.fact-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   9. Skills Section
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.skill-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.skill-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.skill-category-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
}

.skill-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--radius-control);
  background-color: var(--color-surface-secondary);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
}

.skill-badge.exploratory {
  background-color: rgba(201, 136, 69, 0.12);
  color: var(--color-amber);
  border-color: rgba(201, 136, 69, 0.3);
}

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

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.skill-pill {
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 6px 12px;
  background-color: var(--color-surface-secondary);
  color: var(--color-text);
  border-radius: var(--radius-control);
  border: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   10. Projects Section
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-soft);
}

.project-thumbnail-wrapper {
  position: relative;
  background-color: var(--color-surface-secondary);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.project-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.5s ease;
}

.project-card:hover .project-thumbnail {
  transform: scale(1.02);
}

.project-status-pill {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-control);
  background-color: rgba(249, 247, 242, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

[data-theme="dark"] .project-status-pill {
  background-color: rgba(34, 51, 62, 0.95);
}

.status-dot-mini {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-dot-mini.progress {
  background-color: var(--color-amber);
}

.status-dot-mini.completed {
  background-color: var(--color-success);
}

.project-content {
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  flex-grow: 1;
}

.project-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.project-title {
  font-size: 1.5rem;
  font-weight: 600;
}

.project-problem-solution {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
  background-color: var(--color-surface-secondary);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.problem-row, .solution-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-control);
  background-color: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

.project-links {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  padding-top: 12px;
}

.btn-project-link {
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-control);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-speed) ease;
}

.btn-project-link.primary {
  background-color: var(--color-accent);
  color: #F9F7F2;
}

.btn-project-link.primary:hover {
  background-color: var(--color-accent-hover);
}

.btn-project-link.secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-project-link.secondary:hover {
  background-color: var(--color-surface-secondary);
}

/* --------------------------------------------------------------------------
   11. Journey Section
   -------------------------------------------------------------------------- */
.journey-timeline {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
  max-width: 820px;
  margin-inline: auto;
}

.journey-timeline::before {
  content: "";
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: 32px;
  width: 2px;
  background-color: var(--color-border);
}

@media (max-width: 640px) {
  .journey-timeline::before {
    left: 20px;
  }
}

.journey-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  position: relative;
}

@media (max-width: 640px) {
  .journey-item {
    grid-template-columns: 42px 1fr;
    gap: 16px;
  }
}

.journey-step-badge {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: bold;
  color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(120, 148, 169, 0.15);
  z-index: 2;
}

@media (max-width: 640px) {
  .journey-step-badge {
    width: 42px;
    height: 42px;
    font-size: 0.875rem;
  }
}

.journey-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform var(--transition-speed) ease;
}

.journey-card:hover {
  transform: translateX(4px);
  border-color: var(--color-accent);
}

.journey-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.journey-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.journey-period {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-accent);
  background-color: var(--color-surface-secondary);
  padding: 4px 10px;
  border-radius: var(--radius-control);
  border: 1px solid var(--color-border);
}

.journey-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. Contact Section
   -------------------------------------------------------------------------- */
.contact-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 56px 48px;
  box-shadow: var(--shadow-soft);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-info h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
}

.contact-info p {
  color: var(--color-muted);
  font-size: 1rem;
  line-height: 1.65;
}

.contact-links-box {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.contact-pill-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background-color: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
}

.contact-pill-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-input, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: border-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(120, 148, 169, 0.2);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding-block: 40px;
  margin-top: 60px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

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

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

.footer-link {
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color var(--transition-speed) ease;
}

.footer-link:hover {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   14. Toast Notification
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  padding: 14px 20px;
  border-radius: 14px;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 12px;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 360px;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   15. Scroll Reveal Animation Classes
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Respect prefers-reduced-motion */
@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;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* --------------------------------------------------------------------------
   16. Responsive Breakpoints (DESIGN.md guidelines)
   -------------------------------------------------------------------------- */
/* 801px - 1024px: Tablet & compact desktop */
@media (max-width: 1024px) {
  :root {
    --page-gutter: 20px;
  }
  .hero-grid {
    gap: 36px;
  }
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-container {
    padding: 40px 32px;
    gap: 36px;
  }
}

/* 521px - 800px: Small tablet & large mobile */
@media (max-width: 800px) {
  .nav-desktop,
  .status-indicator {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual {
    order: 2;
  }
  .hero-content {
    order: 1;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .contact-container {
    grid-template-columns: 1fr;
    padding: 32px 24px;
  }
}

/* <= 520px: Mobile screen */
@media (max-width: 520px) {
  :root {
    --page-gutter: 16px;
  }
  .skills-grid {
    grid-template-columns: 1fr;
  }
  .hero-headline {
    font-size: 3.4rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn {
    width: 100%;
  }
  .facts-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}