/* ==========================================================================
   ARAFAT HOSEN — PORTFOLIO STYLESHEET (WORLD MAP SPHERE + TIMELINE)
   ========================================================================== */

:root {
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Plus Jakarta Sans', sans-serif;

  --color-bg: #FAFAFC;
  --color-bg-offset: #F0F2F5;
  --color-card: #FFFFFF;
  --color-text: #111118;
  --color-text-muted: #5A5E6D;
  --color-accent: #007AFF;
  --color-accent-soft: rgba(0, 122, 255, 0.08);
  --color-whatsapp: #25D366;
  --color-border: #E2E4E9;

  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.4s var(--ease-smooth);
  --transition-fast: 0.25s var(--ease-smooth);

  --container-width: 1160px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

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;
}

img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--font-heading); margin: 0; color: var(--color-text); }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-text);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 999;
}
.skip-link:focus { left: var(--space-3); top: var(--space-3); }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

.section-container { max-width: var(--container-width); margin: 0 auto; padding: 0 var(--space-4); }
.section-header { margin-bottom: var(--space-6); }
.section-header.centered { text-align: center; max-width: 560px; margin-left: auto; margin-right: auto; }
.section-eyebrow { display: block; font-family: var(--font-heading); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-2); }
.section-title { font-size: clamp(1.9rem, 3.4vw, 2.75rem); font-weight: 700; letter-spacing: -0.01em; line-height: 1.1; }
.contact-sub { margin-top: var(--space-3); color: var(--color-text-muted); font-size: 1.0625rem; }

/* Scroll reveal */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth); }
.js .reveal.is-visible { opacity: 1; transform: translateY(0); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 0.95rem 1.75rem; font-family: var(--font-heading); font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.08em; border-radius: var(--radius-full); border: 1px solid transparent; transition: var(--transition-fast); white-space: nowrap; }
.btn-primary { background: var(--color-text); color: #fff; }
.btn-primary:hover { background: var(--color-accent); transform: translateY(-2px); }
.btn-outline { background: transparent; border-color: var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-text); transform: translateY(-2px); }

.tag { display: inline-flex; align-items: center; padding: 0.4rem 0.85rem; font-size: 0.75rem; font-weight: 600; color: var(--color-text-muted); background: var(--color-bg-offset); border: 1px solid var(--color-border); border-radius: var(--radius-full); }
.badge { display: inline-flex; align-items: center; padding: 0.45rem 1rem; font-family: var(--font-heading); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; color: var(--color-accent); background: var(--color-accent-soft); border: 1px solid var(--color-border); border-radius: var(--radius-full); margin-bottom: var(--space-3); }

/* Navbar */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: var(--color-card); border-bottom: 1px solid transparent; transition: var(--transition-fast); }
.navbar.is-scrolled { border-bottom-color: var(--color-border); box-shadow: 0 1px 0 rgba(17, 17, 24, 0.02); }
.nav-container { max-width: var(--container-width); margin: 0 auto; padding: 0 var(--space-4); height: 76px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }
.logo .accent { color: var(--color-accent); }
.nav-menu { display: flex; align-items: center; gap: var(--space-5); }
.nav-link { font-family: var(--font-heading); font-size: 0.8125rem; font-weight: 600; letter-spacing: 0.08em; color: var(--color-text-muted); position: relative; padding: 0.4rem 0; transition: var(--transition-fast); }
.nav-link::after { content: ''; position: absolute; left: 0; bottom: 0; width: 0; height: 2px; background: var(--color-accent); transition: var(--transition-fast); }
.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after { width: 100%; }
.menu-toggle { display: none; background: none; border: none; font-size: 1.35rem; color: var(--color-text); padding: 0.5rem; }

/* Hero */
.hero { padding: calc(76px + var(--space-7)) 0 var(--space-7); }
.hero-container { max-width: var(--container-width); margin: 0 auto; padding: 0 var(--space-4); display: grid; grid-template-columns: 380px 1fr; gap: var(--space-7); align-items: center; }
.hero-media { display: flex; justify-content: center; }
.profile-frame { width: 100%; max-width: 340px; aspect-ratio: 1 / 1; border-radius: 50%; border: 1px solid var(--color-border); padding: 12px; background: var(--color-card); }
.profile-img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; background: var(--color-bg-offset); }
.hero-title { font-size: clamp(2.75rem, 5.2vw, 4.25rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.05; margin-bottom: var(--space-3); }
.hero-desc { max-width: 540px; font-size: 1.0625rem; color: var(--color-text-muted); margin-bottom: var(--space-5); }
.hero-cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }

/* Projects */
.projects { padding: var(--space-8) 0; }
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.project-card { display: flex; flex-direction: column; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); }
.project-image-wrapper { width: 100%; height: 220px; background: var(--color-bg-offset); overflow: hidden; border-bottom: 1px solid var(--color-border); }
.project-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease-smooth); }
.project-card:hover .project-img { transform: scale(1.04); }
.project-card-body { padding: var(--space-4); display: flex; flex-direction: column; flex-grow: 1; }
.project-card:hover { transform: translateY(-6px); border-color: var(--color-accent); box-shadow: 0 24px 48px -32px rgba(17, 17, 24, 0.18); }
.project-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-2); }
.project-title { font-size: 1.375rem; font-weight: 700; letter-spacing: -0.01em; }
.live-badge { display: inline-flex; align-items: center; gap: 0.4rem; font-family: var(--font-heading); font-size: 0.6875rem; font-weight: 600; letter-spacing: 0.08em; color: #17914f; background: rgba(37, 211, 102, 0.12); border: 1px solid rgba(37, 211, 102, 0.35); padding: 0.25rem 0.6rem; border-radius: var(--radius-full); }
.live-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-whatsapp); }
.project-desc { color: var(--color-text-muted); margin-bottom: var(--space-4); font-size: 0.95rem; flex-grow: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: auto; }

/* ==========================================================================
   TIMELINE SECTION — DUAL COLUMN ALTERNATING
   ========================================================================== */
.experience { background: var(--color-bg-offset); padding: var(--space-8) 0; }
.timeline-container { position: relative; max-width: 960px; margin: 0 auto; padding: var(--space-4) 0; }
.timeline-line { position: absolute; left: 50%; top: 0; bottom: 0; width: 2px; background: var(--color-border); transform: translateX(-50%); }
.timeline-row { display: flex; position: relative; margin-bottom: var(--space-6); width: 100%; }
.timeline-row:last-child { margin-bottom: 0; }

.timeline-panel { width: 45%; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); position: relative; transition: border-color var(--transition-fast), box-shadow var(--transition-fast); }
.timeline-panel:hover { border-color: var(--color-accent); box-shadow: 0 12px 32px -12px rgba(17, 17, 24, 0.08); }

.timeline-badge { position: absolute; left: 50%; top: var(--space-4); transform: translateX(-50%); background: var(--color-text); color: #fff; font-family: var(--font-heading); font-size: 0.8125rem; font-weight: 700; padding: 0.4rem 0.9rem; border-radius: var(--radius-full); border: 3px solid var(--color-bg-offset); z-index: 5; transition: background var(--transition-fast); }
.timeline-row:hover .timeline-badge { background: var(--color-accent); }

.timeline-row.left { justify-content: flex-start; }
.timeline-row.right { justify-content: flex-end; }

.timeline-panel::before { content: ''; position: absolute; top: 24px; width: 0; height: 0; border-style: solid; }
.timeline-row.left .timeline-panel::before { right: -10px; border-width: 10px 0 10px 10px; border-color: transparent transparent transparent var(--color-border); }
.timeline-row.left .timeline-panel::after { content: ''; position: absolute; top: 24px; right: -9px; width: 0; height: 0; border-style: solid; border-width: 10px 0 10px 10px; border-color: transparent transparent transparent var(--color-card); }

.timeline-row.right .timeline-panel::before { left: -10px; border-width: 10px 10px 10px 0; border-color: transparent var(--color-border) transparent transparent; }
.timeline-row.right .timeline-panel::after { content: ''; position: absolute; top: 24px; left: -9px; width: 0; height: 0; border-style: solid; border-width: 10px 10px 10px 0; border-color: transparent var(--color-card) transparent transparent; }

.timeline-meta { font-family: var(--font-heading); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; color: var(--color-accent); margin-bottom: 0.4rem; text-transform: uppercase; }
.timeline-role { font-size: 1.25rem; font-weight: 700; margin-bottom: var(--space-2); letter-spacing: -0.01em; }
.timeline-details { color: var(--color-text-muted); font-size: 0.95rem; }

/* ==========================================================================
   3D WORLD MAP SPHERE SECTION
   ========================================================================== */
.sphere-section { padding: var(--space-8) 0; }
.sphere-desc { max-width: 560px; color: var(--color-text-muted); font-size: 1.0625rem; margin-bottom: var(--space-6); }
.sphere-wrapper { display: flex; justify-content: center; }

#canvas3dContainer {
  width: 500px;
  height: 500px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  touch-action: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
}
#canvas3dContainer:active { cursor: grabbing; }
#canvas3dContainer canvas { display: block; width: 100% !important; height: 100% !important; }
.sphere-fallback { font-family: var(--font-heading); font-size: 0.8125rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted); }

/* Contact */
.contact { padding: var(--space-8) 0; }
.social-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(0.5rem, 2vw, var(--space-3)); max-width: 640px; margin: 0 auto; }
.social-block { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.6rem; padding: clamp(1rem, 4vw, var(--space-5)) 0.5rem; background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-md); transition: var(--transition-fast); }
.social-block i { font-size: clamp(1.1rem, 4.5vw, 1.5rem); color: var(--color-text); transition: var(--transition-fast); }
.social-block span { font-family: var(--font-heading); font-size: clamp(0.625rem, 2.6vw, 0.8125rem); font-weight: 700; letter-spacing: 0.06em; }
.social-block:hover { border-color: var(--color-accent); transform: translateY(-4px); }
.social-block:hover i { color: var(--color-accent); }

/* Floating Components */
.whatsapp-float { position: fixed; right: var(--space-4); bottom: var(--space-4); width: 56px; height: 56px; border-radius: 50%; background: var(--color-whatsapp); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; box-shadow: 0 12px 24px -8px rgba(37, 211, 102, 0.55); transition: var(--transition-fast); z-index: 90; }
.whatsapp-float:hover { transform: translateY(-3px) scale(1.05); }
.site-footer { text-align: center; padding: var(--space-5) var(--space-4); border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: 0.875rem; }

/* Responsive Grid Adjustments */
@media (max-width: 880px) {
  .nav-menu { position: absolute; top: 76px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--color-card); border-bottom: 1px solid var(--color-border); overflow: hidden; max-height: 0; opacity: 0; transition: max-height var(--transition), opacity var(--transition-fast); }
  .nav-menu.is-active { max-height: 320px; opacity: 1; }
  .nav-link { padding: var(--space-3) var(--space-4); border-top: 1px solid var(--color-border); }
  .nav-link::after { display: none; }
  .menu-toggle { display: inline-flex; }

  .hero-container { grid-template-columns: 1fr; text-align: center; gap: var(--space-5); }
  .hero-media { order: -1; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }

  .projects-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .timeline-line { left: 24px; transform: none; }
  .timeline-row { flex-direction: column; align-items: flex-start; padding-left: 56px; width: 100%; }
  .timeline-panel { width: 100%; }
  .timeline-badge { left: 24px; transform: translateX(-50%); top: 20px; }

  .timeline-row.left .timeline-panel::before,
  .timeline-row.right .timeline-panel::before {
    left: -10px;
    right: auto;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--color-border) transparent transparent;
  }
  .timeline-row.left .timeline-panel::after,
  .timeline-row.right .timeline-panel::after {
    left: -9px;
    right: auto;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--color-card) transparent transparent;
  }
}

@media (max-width: 560px) {
  .section-container { padding: 0 var(--space-3); }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
  #canvas3dContainer { width: min(92vw, 400px); height: min(92vw, 400px); }
  .social-grid { gap: 0.5rem; }
}