/* ==========================================================================
   ISRAK HOSSAIN EMON — PORTFOLIO STYLES
   Aesthetic: Warm artisanal minimalism, earthy tones, editorial typography.
   Strictly NO purple/blue AI gradient clichés.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Color Schemes
   -------------------------------------------------------------------------- */
:root {
  /* Warm Dark Mode (Default) - Rich charcoal, warm stone, amber & ochre */
  --bg: #141311;
  --bg-subtle: #1a1916;
  --surface: #201e1b;
  --surface-elevated: #282622;
  --surface-hover: #322f2a;
  --border: #38342d;
  --border-light: #46423a;

  --text-main: #f0ece1;
  --text-muted: #aba496;
  --text-faint: #787266;

  /* Earthy Warm Amber / Terracotta Accents */
  --accent: #d97706;              /* Warm amber / ochre */
  --accent-hover: #b45309;        /* Deep amber */
  --accent-soft: rgba(217, 119, 6, 0.15);
  --accent-glow: rgba(217, 119, 6, 0.25);
  --accent-contrast: #141311;

  /* Natural Emerald / Sage for subtle badges & status */
  --status-online: #10b981;
  --status-soft: rgba(16, 185, 129, 0.16);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Layout & Spacing */
  --container-max: 1040px;
  --header-height: 70px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);

  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Warm Light Mode - Parchment / Warm Paper & Terracotta */
[data-theme="light"] {
  --bg: #faf7f2;
  --bg-subtle: #f2eee6;
  --surface: #ffffff;
  --surface-elevated: #f5f1e8;
  --surface-hover: #ebe5d9;
  --border: #dfd8cb;
  --border-light: #cec4b2;

  --text-main: #24211c;
  --text-muted: #676155;
  --text-faint: #9c9587;

  --accent: #c2593f;              /* Warm terracotta / burnt sienna */
  --accent-hover: #9e432c;
  --accent-soft: rgba(194, 89, 63, 0.12);
  --accent-glow: rgba(194, 89, 63, 0.2);
  --accent-contrast: #ffffff;

  --status-online: #2d8a5b;
  --status-soft: rgba(45, 138, 91, 0.12);

  --shadow-sm: 0 1px 2px rgba(40, 32, 20, 0.05);
  --shadow-md: 0 4px 14px rgba(40, 32, 20, 0.08);
  --shadow-lg: 0 14px 34px rgba(40, 32, 20, 0.12);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.5rem);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  text-align: start;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Modern Typography Wrapping */
h1, h2, h3, h4, .section-title {
  text-wrap: balance;
  color: var(--text-main);
  line-height: 1.25;
}

p, li, blockquote {
  text-wrap: pretty;
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* --------------------------------------------------------------------------
   3. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  border-top: 1px solid var(--border);
}

.section-alt {
  background-color: var(--bg-subtle);
}

.section-header {
  margin-bottom: 3rem;
  max-width: 68ch;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background-color: var(--accent-soft);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.85rem;
  border: 1px solid var(--border-light);
}

.section-title {
  font-size: clamp(1.75rem, 1.25rem + 2vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(20, 19, 17, 0.9);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="light"] .site-header {
  background-color: rgba(250, 247, 242, 0.92);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--accent);
  color: var(--accent-contrast);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.brand-text {
  color: var(--text-main);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 500;
  position: relative;
  padding: 0.35rem 0;
  transition: color var(--transition-fast);
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* --------------------------------------------------------------------------
   5. Buttons & Interactive Elements
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-sm {
  padding: 0.4rem 0.875rem;
  font-size: 0.875rem;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--accent-contrast);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--surface);
  color: var(--text-main);
  border-color: var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--text-main);
  background-color: var(--surface);
  border-color: var(--border-light);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-main);
  border-color: var(--accent);
  background-color: var(--surface-hover);
}

/* Theme Toggle Button Icons */
.theme-btn .moon-icon {
  display: none;
}
.theme-btn .sun-icon {
  display: block;
}

[data-theme="light"] .theme-btn .moon-icon {
  display: block;
}
[data-theme="light"] .theme-btn .sun-icon {
  display: none;
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 3.5rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.9rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--status-online);
  box-shadow: 0 0 0 3px var(--status-soft);
  animation: pulse-dot 2.5s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

.hero-title {
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.highlight {
  color: var(--accent);
  position: relative;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 58ch;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-subtitle strong {
  color: var(--text-main);
  font-weight: 600;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 2.25rem;
  max-width: fit-content;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.meta-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  font-family: var(--font-mono);
}

.meta-val {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.meta-divider {
  width: 1px;
  height: 28px;
  background-color: var(--border);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Hero Visual / Avatar Card */
.hero-visual {
  display: flex;
  justify-content: center;
}

.avatar-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1.75rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 310px;
  text-align: center;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

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

.avatar-frame {
  width: 170px;
  height: 170px;
  border-radius: 50%;
  margin-bottom: 1.25rem;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.avatar-illustration {
  width: 100%;
  height: 100%;
  display: block;
}

.avatar-tag {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.tag-title {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-main);
}

.tag-subtitle {
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   7. About Section
   -------------------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 3.5rem;
  align-items: start;
}

.about-text-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  color: var(--text-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
}

.lead-text {
  font-size: 1.1875rem;
  color: var(--text-main);
  line-height: 1.6;
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.fact-card {
  padding: 1.125rem 1rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.fact-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
}

.fact-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.info-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.info-box-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.principles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.principles-list li {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}

.check-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.principles-list strong {
  display: block;
  font-size: 0.9375rem;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.principles-list p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   8. Education Section
   -------------------------------------------------------------------------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.75rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.timeline-card:hover {
  border-color: var(--border-light);
}

.timeline-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background-color: var(--accent-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--accent);
  flex-shrink: 0;
}

.timeline-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.timeline-institution {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.timeline-degree {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 600;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-faint);
  background-color: var(--surface-elevated);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

.timeline-desc {
  color: var(--text-muted);
  line-height: 1.65;
  font-size: 0.96875rem;
}

.coursework-block {
  margin-top: 0.5rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
}

.coursework-title {
  display: block;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-faint);
  margin-bottom: 0.75rem;
}

.course-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.course-tag {
  font-size: 0.8125rem;
  padding: 0.3rem 0.65rem;
  background-color: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   9. Skills Section
   -------------------------------------------------------------------------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.skill-category-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.skill-category-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-light);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
}

.cat-icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
  color: var(--accent);
}

.cat-title {
  font-size: 1.125rem;
  font-weight: 700;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-light);
}

.skill-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.skill-name {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-main);
}

.skill-level {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   10. Projects Section
   -------------------------------------------------------------------------- */
.project-filters {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2.25rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.45rem 1.1rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--text-main);
  border-color: var(--border-light);
}

.filter-btn.active {
  background-color: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.project-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.85rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-light);
  box-shadow: var(--shadow-md);
}

.project-card.hidden {
  display: none;
}

.project-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  background-color: var(--accent-soft);
  color: var(--accent);
  border-radius: var(--radius-sm);
}

.project-links {
  display: flex;
  gap: 0.5rem;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.icon-link:hover {
  color: var(--text-main);
  background-color: var(--surface-elevated);
  border-color: var(--border);
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.project-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.project-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  padding-left: 0.25rem;
}

.highlight-point {
  font-size: 0.84375rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  background-color: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   11. Contact Section
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.contact-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.contact-icon-bubble {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.contact-card-title {
  font-size: 1.125rem;
  font-weight: 700;
}

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

.contact-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 0.75rem;
  gap: 0.5rem;
}

.contact-email-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  word-break: break-all;
  font-weight: 500;
}

.contact-email-link:hover {
  text-decoration: underline;
}

.contact-subdetail {
  font-size: 0.8125rem;
  color: var(--text-faint);
  margin-top: auto;
  padding-top: 0.75rem;
}

.social-links-list {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 0.75rem;
}

.social-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  background-color: var(--surface-elevated);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.social-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.social-pill .arrow {
  transition: transform var(--transition-fast);
}

.social-pill:hover .arrow {
  transform: translateX(2px);
}

/* Contact Message Box / Form */
.contact-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.contact-box-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.contact-box-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.quick-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-faint);
}

.form-submit-btn {
  align-self: flex-start;
  margin-top: 0.5rem;
}

/* --------------------------------------------------------------------------
   12. Toast Notification
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--surface-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 1000;
  opacity: 0;
  transform: translateY(15px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

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

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  background-color: var(--bg);
  font-size: 0.875rem;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.footer-brand {
  font-weight: 700;
  color: var(--text-main);
}

.footer-sub {
  color: var(--text-muted);
}

.footer-right {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: right;
}

.footer-note {
  color: var(--text-faint);
  font-size: 0.8125rem;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* --------------------------------------------------------------------------
   14. Responsive Breakpoints
   -------------------------------------------------------------------------- */
@media (max-width: 860px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    order: -1;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

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

  .footer-container {
    flex-direction: column;
    text-align: left;
    align-items: flex-start;
  }

  .footer-right {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none; /* Keep clean single page without cluttered mobile menus */
  }

  .quick-facts {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .hero-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    width: 100%;
  }

  .meta-divider {
    display: none;
  }

  .timeline-card {
    grid-template-columns: 1fr;
  }
}