/* =============================================================
   Alex Styles Portfolio — styles.css
   Activity 1: Foundational CSS (Typography, Color, Layout,
               Transitions, Animations)
   Activity 2: Responsive Design (Media Queries, Flexible Layouts)
   Activity 3: UI/UX Enhancements (Modal, Tooltips, Visual Polish)
   ============================================================= */

/* ─────────────────────────────────────────────
   ACTIVITY 1: FOUNDATIONAL CSS
   ───────────────────────────────────────────── */

/* 1.1 — CSS Reset & Custom Properties
   ───────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Color palette */
  --color-bg:        #f8f7f4;
  --color-surface:   #ffffff;
  --color-dark:      #1a1a2e;
  --color-dark-alt:  #16213e;
  --color-accent:    #e94560;
  --color-accent-dk: #c73652;
  --color-muted:     #6b7280;
  --color-border:    #e5e7eb;
  --color-tag-bg:    #eef0f8;
  --color-tag-text:  #1a1a2e;

  /* Typography */
  --font-body:    'Inter', sans-serif;
  --font-display: 'Playfair Display', serif;

  /* Fluid font sizes */
  --text-sm:   clamp(0.8rem,  1.5vw, 0.875rem);
  --text-base: clamp(0.9rem,  2vw,   1rem);
  --text-lg:   clamp(1rem,    2.5vw, 1.125rem);
  --text-xl:   clamp(1.125rem,3vw,   1.375rem);
  --text-2xl:  clamp(1.5rem,  4vw,   2rem);
  --text-3xl:  clamp(2rem,    5vw,   2.75rem);
  --text-4xl:  clamp(2.5rem,  6vw,   3.5rem);

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Effects */
  --radius:      8px;
  --radius-lg:   16px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg:   0 12px 40px rgba(0,0,0,0.16);
  --transition:  all 0.25s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-dark);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

/* 1.2 — Layout Utilities
   ───────────────────────── */
.container {
  width: 100%;
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section {
  padding-block: var(--space-2xl);
}

/* 1.3 — Typography
   ──────────────── */
.eyebrow {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.about-heading {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  line-height: 1.15;
  color: var(--color-dark);
  margin-bottom: var(--space-md);
}

.accent {
  color: var(--color-accent);
}

.about-bio {
  font-size: var(--text-lg);
  color: var(--color-muted);
  max-width: 52ch;
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--color-dark);
  margin-bottom: var(--space-xs);
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
}

/* 1.4 — Header & Navigation
   ────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(248, 247, 244, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-dark);
  transition: var(--transition);
}

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

.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

/* 1.5 — Nav Link hover transition
   ────────────────────────────────── */
.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-dark);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  outline: none;
}

/* Hamburger (hidden on desktop) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* 1.6 — About Section
   ───────────────────── */
.section--about {
  background-color: var(--color-surface);
  min-height: calc(100vh - 68px);
  display: flex;
  align-items: center;
}

.about-grid {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.about-text {
  flex: 1;
}

.about-visual {
  flex-shrink: 0;
}

.avatar-placeholder {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow-lg);
}

/* 1.7 — Skill Tags
   ──────────────── */
.skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.skill-tag {
  padding: 4px 14px;
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 500;
  background-color: var(--color-tag-bg);
  color: var(--color-tag-text);
  transition: var(--transition);
}

.skill-tag:hover {
  background-color: var(--color-accent);
  color: #fff;
}

/* 1.8 — Buttons
   ────────────── */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  text-align: center;
}

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

.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: var(--color-accent-dk);
  border-color: var(--color-accent-dk);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.35);
  outline: none;
}

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

.btn--secondary:hover,
.btn--secondary:focus-visible {
  background-color: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
  outline: none;
}

.btn--full {
  width: 100%;
}

/* 1.9 — Portfolio Grid & Cards
   ────────────────────────────── */
.section--portfolio {
  background-color: var(--color-bg);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.portfolio-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 1.10 — Card hover transition
   ─────────────────────────────── */
.portfolio-card:hover,
.portfolio-card:focus-visible {
  transform: translateY(-6px) scale(1.015);
  box-shadow: var(--shadow-lg);
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* 1.11 — Portfolio card thumbnails (color placeholders)
   ──────────────────────────────────────────────────── */
.card-thumb {
  height: 200px;
  background-size: cover;
  background-position: center;
}

.card-thumb--1 { background-color: #d4e8d4; background-image: linear-gradient(135deg, #a8d8a8 0%, #d4e8d4 100%); }
.card-thumb--2 { background-color: #d4d4e8; background-image: linear-gradient(135deg, #a8a8d8 0%, #d4d4e8 100%); }
.card-thumb--3 { background-color: #e8d4d4; background-image: linear-gradient(135deg, #d8a8a8 0%, #e8d4d4 100%); }
.card-thumb--4 { background-color: #e8e4d4; background-image: linear-gradient(135deg, #d8d0a8 0%, #e8e4d4 100%); }
.card-thumb--5 { background-color: #d4e4e8; background-image: linear-gradient(135deg, #a8d0d8 0%, #d4e4e8 100%); }
.card-thumb--6 { background-color: #e8d4e4; background-image: linear-gradient(135deg, #d8a8d0 0%, #e8d4e4 100%); }

.card-info {
  padding: var(--space-sm) var(--space-md);
}

.card-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 2px;
}

.card-category {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

/* 1.12 — Fade-in animation for portfolio cards
   ─────────────────────────────────────────────── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.portfolio-card {
  animation: fadeInUp 0.5s ease both;
}

.portfolio-card:nth-child(1) { animation-delay: 0.05s; }
.portfolio-card:nth-child(2) { animation-delay: 0.10s; }
.portfolio-card:nth-child(3) { animation-delay: 0.15s; }
.portfolio-card:nth-child(4) { animation-delay: 0.20s; }
.portfolio-card:nth-child(5) { animation-delay: 0.25s; }
.portfolio-card:nth-child(6) { animation-delay: 0.30s; }

/* 1.13 — Contact Section
   ─────────────────────── */
.section--contact {
  background-color: var(--color-surface);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
  align-items: start;
}

.contact-text {
  font-size: var(--text-lg);
  color: var(--color-muted);
  margin-bottom: var(--space-md);
}

.contact-detail {
  font-size: var(--text-base);
  color: var(--color-muted);
  margin-bottom: var(--space-xs);
}

.contact-detail strong {
  color: var(--color-dark);
}

/* 1.14 — Form
   ─────────── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

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

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

.form-group input,
.form-group textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  padding: 0.65rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  background-color: var(--color-bg);
  color: var(--color-dark);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.15);
}

/* 1.15 — Footer
   ─────────────── */
.site-footer {
  background-color: var(--color-dark);
  color: rgba(255,255,255,0.5);
  padding-block: var(--space-md);
  font-size: var(--text-sm);
  text-align: center;
}


/* =============================================================
   ACTIVITY 2: RESPONSIVE DESIGN
   Media Queries & Flexible Layouts
   ============================================================= */

/* 2.1 — Tablet (max-width: 1024px)
   ────────────────────────────────── */
@media (max-width: 1024px) {
  .container {
    padding-inline: var(--space-md);
  }

  .about-grid {
    gap: var(--space-xl);
  }

  .avatar-placeholder {
    width: 210px;
    height: 210px;
    font-size: 2.75rem;
  }

  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* 2.2 — Mobile (max-width: 768px)
   ────────────────────────────────── */
@media (max-width: 768px) {
  .section {
    padding-block: var(--space-xl);
  }

  /* Nav: hamburger toggle */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list.is-open {
    max-height: 300px;
  }

  .nav-list li {
    border-top: 1px solid var(--color-border);
  }

  .nav-link {
    display: block;
    padding: var(--space-sm) var(--space-lg);
    border-bottom: none;
  }

  /* About: stack vertically */
  .about-grid {
    flex-direction: column-reverse;
    text-align: center;
    gap: var(--space-lg);
  }

  .about-bio {
    max-width: 100%;
  }

  .skills {
    justify-content: center;
  }

  .avatar-placeholder {
    width: 160px;
    height: 160px;
    font-size: 2rem;
  }

  /* Portfolio: single column */
  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  /* Contact: full-width form */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* 2.3 — Desktop (min-width: 1025px) — explicit reinforcement
   ─────────────────────────────────────────────────────────── */
@media (min-width: 1025px) {
  .portfolio-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-grid {
    flex-direction: row;
  }

  .contact-grid {
    grid-template-columns: 1fr 1.5fr;
  }
}


/* =============================================================
   ACTIVITY 3: UI/UX ENHANCEMENTS
   Modals, Tooltips, Visual Polish
   ============================================================= */

/* 3.1 — Tooltip (CSS-based, data-tooltip attribute)
   ─────────────────────────────────────────────────── */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-dark);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
  padding: 5px 10px;
  border-radius: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: translateX(-50%) translateY(-4px);
  z-index: 200;
}

[data-tooltip]::before {
  content: '';
  position: absolute;
  top: calc(100% + 3px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-bottom-color: var(--color-dark);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 200;
}

[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

[data-tooltip]:hover::before,
[data-tooltip]:focus-visible::before {
  opacity: 1;
}

/* 3.2 — Modal Overlay
   ───────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(26, 26, 46, 0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* 3.3 — Modal Box
   ────────────────── */
.modal {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  max-width: 540px;
  width: 100%;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s ease;
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-muted);
  cursor: pointer;
  line-height: 1;
  padding: 6px 10px;
  border-radius: var(--radius);
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--color-accent);
  background-color: var(--color-tag-bg);
}

.modal-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
  padding-right: var(--space-lg);
}

.modal-body {
  font-size: var(--text-base);
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.modal-cta {
  display: inline-block;
}

/* 3.4 — Visual polish: section-title accent underline
   ──────────────────────────────────────────────────── */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin-top: 8px;
  margin-bottom: var(--space-sm);
}

/* 3.5 — Contact intro heading spacing fix for the underline */
.contact-intro .section-title::after {
  margin-bottom: var(--space-md);
}

/* 3.6 — Form submit feedback */
.contact-form .btn--primary {
  margin-top: var(--space-xs);
}

/* 3.7 — Focus-visible ring (accessibility)
   ─────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}