/* styles.css — Personal profile website for Andrew Lowrey */

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

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

body {
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

input,
button,
textarea,
select {
  font: inherit;
}

ul,
ol {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
  line-height: 1.2;
}

p {
  overflow-wrap: break-word;
}

/* ===== CSS Custom Properties — Light Mode (default) ===== */
:root {
  /* Entain brand colours */
  --color-primary: #003d6b;
  --color-primary-hover: #002a4a;
  --color-secondary: #e6007e;
  --color-secondary-hover: #cc006e;

  /* Neutrals */
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f8;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #4a5568;
  --color-border: #e2e8f0;

  /* Spacing */
  --section-spacing: 64px;
  --container-max-width: 960px;
  --container-padding: 24px;

  /* Typography */
  --font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;       /* 16px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.5rem;       /* 24px */
  --font-size-2xl: 2rem;        /* 32px */
  --font-size-3xl: 2.5rem;      /* 40px */

  /* Transitions */
  --transition-speed: 0.2s;
}

/* ===== CSS Custom Properties — Dark Mode ===== */
[data-theme="dark"] {
  --color-primary: #4db8ff;
  --color-primary-hover: #80ccff;
  --color-secondary: #00d4c8;
  --color-secondary-hover: #33ffe0;

  --color-bg: #0a1628;
  --color-bg-alt: #132238;
  --color-surface: #132238;
  --color-text: #e8ecf0;
  --color-text-muted: #94a3b8;
  --color-border: #2d3f56;
}

/* ===== CSS Fallback — OS Dark Mode (no JS) ===== */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary: #4db8ff;
    --color-primary-hover: #80ccff;
    --color-secondary: #00d4c8;
    --color-secondary-hover: #33ffe0;

    --color-bg: #0a1628;
    --color-bg-alt: #132238;
    --color-surface: #132238;
    --color-text: #e8ecf0;
    --color-text-muted: #94a3b8;
    --color-border: #2d3f56;
  }
}

/* ===== Base Typography & Layout ===== */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: color var(--transition-speed) ease,
              background-color var(--transition-speed) ease;
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: 24px;
}

h3 {
  font-size: var(--font-size-xl);
}

a {
  transition: color var(--transition-speed) ease;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Section Spacing ===== */
main > section,
#hero {
  padding: var(--section-spacing) var(--container-padding);
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
}

/* ===== Navigation Bar ===== */
#nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px var(--container-padding);
  background-color: #003d6b;
  border-bottom: 1px solid #002a4a;
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

.nav-logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: #ffffff;
  white-space: nowrap;
}

.nav-logo:hover {
  color: #e6007e;
}

/* Hamburger button — visible on mobile */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: var(--font-size-lg);
  color: #ffffff;
  cursor: pointer;
  order: 1;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  padding: 6px 10px;
  font-size: var(--font-size-lg);
  color: #ffffff;
  cursor: pointer;
  order: 2;
}

/* Nav links — hidden on mobile by default */
.nav-links {
  display: none;
  flex-direction: column;
  width: 100%;
  gap: 0;
  order: 3;
  padding-top: 12px;
}

/* Revealed when hamburger is toggled */
.nav-links--open {
  display: flex;
}

.nav-links li a {
  display: block;
  padding: 10px 0;
  color: rgba(255,255,255,0.8);
  font-size: var(--font-size-base);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: color var(--transition-speed) ease;
}

.nav-links li:last-child a {
  border-bottom: none;
}

.nav-links li a:hover {
  color: #e6007e;
}

/* Focus indicators for all nav interactive elements */
.nav-logo:focus-visible,
.nav-toggle:focus-visible,
.theme-toggle:focus-visible,
.nav-links a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Desktop Navigation (768px+) ===== */
@media (min-width: 768px) {
  #nav {
    flex-wrap: nowrap;
    gap: 24px;
  }

  .nav-toggle {
    display: none;
  }

  .nav-links,
  .nav-links--open {
    display: flex;
    flex-direction: row;
    width: auto;
    gap: 8px;
    padding-top: 0;
    order: 1;
  }

  .nav-links li a {
    padding: 6px 10px;
    border-bottom: none;
    border-radius: 4px;
    font-size: var(--font-size-sm);
  }

  .nav-links li a:hover {
    background-color: var(--color-bg-alt);
  }

  .theme-toggle {
    order: 2;
    margin-left: auto;
  }
}

/* ===== Hero Section ===== */
#hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.hero-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-border);
  background-color: var(--color-bg-alt);
  transition: border-color var(--transition-speed) ease;
}

.hero-headline {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

.hero-ctas {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
  width: 100%;
  max-width: 300px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: var(--font-size-base);
  font-weight: 600;
  text-align: center;
  border-radius: 6px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

.btn-primary {
  background-color: #e6007e;
  color: #fff;
}

.btn-primary:hover {
  background-color: #cc006e;
}

.btn-secondary {
  background-color: transparent;
  color: #e6007e;
  border-color: #e6007e;
}

.btn-secondary:hover {
  background-color: #e6007e;
  color: #fff;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Hero — Desktop (768px+) ===== */
@media (min-width: 768px) {
  .hero-photo {
    width: 200px;
    height: 200px;
  }

  .hero-ctas {
    flex-direction: row;
    justify-content: center;
    max-width: none;
    width: auto;
  }
}

/* ===== About Section ===== */
#about p {
  max-width: 70ch;
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.7;
}

#about p + p {
  margin-top: 16px !important;
}

/* ===== Experience Section ===== */
.experience-entry {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.experience-entry:last-child {
  border-bottom: none;
}

.experience-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.experience-company {
  font-size: var(--font-size-base);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 2px;
}

.experience-dates {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.experience-achievements {
  list-style: disc;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.experience-achievements li {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.6;
}

/* ===== Skills Section ===== */
#skills {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.skills-category h3 {
  font-size: var(--font-size-lg);
  margin-bottom: 12px;
  color: var(--color-text);
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  display: inline-block;
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  background-color: var(--color-bg-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  white-space: nowrap;
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

/* ===== Skills — Desktop Grid (768px+) ===== */
@media (min-width: 768px) {
  #skills {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }

  #skills > h2 {
    grid-column: 1 / -1;
  }
}

/* ===== Projects Section ===== */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: box-shadow var(--transition-speed) ease,
              border-color var(--transition-speed) ease,
              background-color var(--transition-speed) ease;
}

.project-card h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text);
}

.project-card p {
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tech li {
  font-size: var(--font-size-sm);
  padding: 4px 10px;
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 9999px;
  color: var(--color-text-muted);
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

.project-card a {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  margin-top: auto;
  transition: color var(--transition-speed) ease;
}

.project-card a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.project-card a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Projects — Desktop Grid (768px+) */
@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== CV Section ===== */
.cv-summary {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

.cv-summary p {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.7;
}

.cv-summary h3 {
  font-size: var(--font-size-lg);
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--color-text);
}

.cv-summary h3:first-child {
  margin-top: 0;
}

.cv-summary p + p {
  margin-top: 12px;
}

.cv-summary .skills-tags {
  margin-bottom: 8px;
}

.cv-summary .experience-achievements {
  margin-bottom: 8px;
}

/* ===== Contact Section ===== */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-links li a {
  display: inline-block;
  font-size: var(--font-size-lg);
  color: var(--color-primary);
  padding: 8px 0;
  transition: color var(--transition-speed) ease;
}

.contact-links li a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.contact-links li a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Footer ===== */
footer {
  background-color: var(--color-bg-alt);
  text-align: center;
  padding: 32px var(--container-padding);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--color-border);
  transition: background-color var(--transition-speed) ease,
              color var(--transition-speed) ease,
              border-color var(--transition-speed) ease;
}

/* ===== Horizontal Scroll Prevention (Req 9.4) ===== */
html {
  overflow-x: hidden;
}

body {
  overflow-x: hidden;
}

/* ===== Small Viewport Adjustments (320px) ===== */
@media (max-width: 480px) {
  :root {
    --container-padding: 16px;
    --section-spacing: 48px;
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  h3 {
    font-size: var(--font-size-lg);
  }

  .hero-photo {
    width: 120px;
    height: 120px;
  }

  .hero-headline {
    font-size: var(--font-size-base);
  }

  .btn {
    padding: 10px 20px;
    font-size: var(--font-size-sm);
  }
}

/* ===== Large Viewport Adjustments (1200px+) ===== */
@media (min-width: 1200px) {
  :root {
    --container-max-width: 1080px;
  }
}

/* ===== Extra-Large Viewport (1440px+) ===== */
@media (min-width: 1440px) {
  :root {
    --container-max-width: 1140px;
    --section-spacing: 80px;
  }

  h1 {
    font-size: 3rem;
  }

  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Universal Focus Indicators (Req 14.5) ===== */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== About Lines (no bullets) ===== */
.about-lines {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

.about-lines li {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.6;
}