/* 
 * Ahmed Mousa - Analog/Mixed-Signal IC Design Portfolio
 * Clean, Academic White Theme
 * Precision Typography: Amiri for Arabic, Inter for English, JetBrains Mono for Code/Specs
 */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --border-dark: #cbd5e1;
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --accent-tech: #0284c7;
  --accent-tech-dark: #0369a1;
  --accent-tech-dim: rgba(2, 132, 199, 0.08);
  --accent-border: #bae6fd;
  --code-bg: #f8fafc;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-arabic: 'Amiri', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-tech);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-tech-dark);
  text-decoration: underline;
}

/* Arabic typography rules */
.arabic-text, [dir="rtl"], :lang(ar) {
  font-family: var(--font-arabic) !important;
  font-size: 1.15rem;
  line-height: 1.95;
  text-align: right;
  direction: rtl;
}

h1.arabic-text, [dir="rtl"] h1 {
  font-size: 1.95rem;
  font-weight: 700;
  line-height: 1.6;
}

h2.arabic-text, [dir="rtl"] h2 {
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.6;
}

h3.arabic-text, [dir="rtl"] h3 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.6;
}

/* Header & Navigation */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.brand-title {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand-title span {
  color: var(--accent-tech);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
  text-decoration: none;
  font-weight: 600;
}

.nav-badge-lock {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  background-color: var(--accent-tech-dim);
  border: 1px solid var(--accent-border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-tech-dark) !important;
  font-weight: 600 !important;
  white-space: nowrap;
}

/* Main Container */
.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

/* Hero / Header Section */
.profile-hero {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2.5rem;
  margin-bottom: 3rem;
}

.profile-name {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
}

.profile-title {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-tech);
  margin-bottom: 1.15rem;
}

.profile-bio {
  color: var(--text-body);
  font-size: 1.02rem;
  max-width: 820px;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.profile-contact-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.profile-contact-bar a {
  color: var(--text-body);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

.profile-contact-bar a:hover {
  color: var(--accent-tech);
}

/* Technical Badges */
.tools-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.85rem;
}

.tech-tag {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-body);
  font-weight: 500;
}

.tech-tag.highlight {
  border-color: var(--accent-border);
  color: var(--accent-tech-dark);
  background-color: var(--accent-tech-dim);
  font-weight: 600;
}

/* Sections */
.section {
  margin-bottom: 3.5rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.65rem;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-tech);
}

/* Project Cards */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.project-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.35rem 1.5rem;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.project-card:hover {
  border-color: var(--border-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.project-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-weight: 500;
}

.project-desc {
  color: var(--text-body);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 0.85rem;
}

/* Metric Specs Table Wrapper for Mobile Responsiveness */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0.85rem 0;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.84rem;
  font-family: var(--font-mono);
  white-space: nowrap;
}

.specs-table th,
.specs-table td {
  padding: 0.5rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

.specs-table th:last-child,
.specs-table td:last-child {
  border-right: none;
}

.specs-table tr:last-child td {
  border-bottom: none;
}

.specs-table th {
  background-color: var(--bg-secondary);
  color: var(--text-main);
  font-weight: 600;
}

.specs-table td {
  background-color: #ffffff;
  color: var(--text-body);
}

/* Experience & Education */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.timeline-item {
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border-color);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-tech);
}

.timeline-role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.timeline-meta {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-tech-dark);
  margin-bottom: 0.4rem;
}

.timeline-desc {
  color: var(--text-body);
  font-size: 0.94rem;
  line-height: 1.65;
}

/* Mobile Toggle Bar for Vault */
.mobile-vault-bar {
  display: none;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  justify-content: space-between;
  align-items: center;
}

.mobile-vault-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
}

/* Vault / Courses Explorer Layout */
.vault-layout {
  display: flex;
  min-height: calc(100vh - 60px);
  border-top: 1px solid var(--border-color);
  background-color: #ffffff;
}

.vault-sidebar {
  width: 320px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: max-height 0.25s ease;
}

.sidebar-header {
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-search {
  width: 100%;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.75rem;
  font-size: 0.84rem;
  border-radius: 4px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.15s ease;
}

.sidebar-search:focus {
  border-color: var(--accent-tech);
}

.file-tree {
  overflow-y: auto;
  padding: 0.75rem 0.5rem;
  flex: 1;
}

.tree-folder {
  margin-bottom: 0.35rem;
}

.folder-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.6rem;
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 4px;
  user-select: none;
}

.folder-title:hover {
  background-color: var(--bg-tertiary);
}

.folder-icon {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.folder-icon.open {
  transform: rotate(90deg);
}

.folder-children {
  padding-left: 1.1rem;
  display: block;
}

.folder-children.collapsed {
  display: none;
}

.tree-file {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.6rem;
  color: var(--text-body);
  font-size: 0.84rem;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  line-height: 1.4;
}

.tree-file:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  text-decoration: none;
}

.tree-file.active {
  background-color: #ffffff;
  color: var(--accent-tech-dark);
  border-left: 3px solid var(--accent-tech);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* Vault Content Area */
.vault-content-wrap {
  flex: 1;
  overflow-y: auto;
  background-color: #ffffff;
  display: flex;
  justify-content: center;
}

.vault-article {
  max-width: 860px;
  width: 100%;
  padding: 2.5rem 2rem 5rem;
}

/* Markdown Rendering in Vault */
.markdown-body {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.8;
}

.markdown-body h1 {
  font-size: 1.95rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.65rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.markdown-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border-color);
}

.markdown-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 1.6rem;
  margin-bottom: 0.65rem;
}

.markdown-body p {
  margin-bottom: 1.15rem;
}

.markdown-body ul, 
.markdown-body ol {
  margin-bottom: 1.25rem;
  padding-right: 1.5rem;
  padding-left: 1.5rem;
}

.markdown-body li {
  margin-bottom: 0.45rem;
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 2rem 0;
}

.markdown-body pre {
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1.1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  margin-bottom: 1.5rem;
  line-height: 1.55;
  direction: ltr !important;
  text-align: left !important;
}

.markdown-body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  color: var(--accent-tech-dark);
  direction: ltr;
  display: inline-block;
}

.markdown-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-main);
  display: block;
}

/* KaTeX equations handling & Bidi Isolation */
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.85rem 0;
  direction: ltr !important;
  text-align: center;
  unicode-bidi: isolate !important;
}

.katex {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  font-size: 1.05em;
  text-align: left;
}

.math-isolate {
  direction: ltr !important;
  unicode-bidi: isolate !important;
  display: inline-block !important;
  vertical-align: middle;
  margin: 0 0.25rem;
}

/* Authentic Obsidian Callouts */
.callout {
  border-radius: 6px;
  margin: 1.5rem 0;
  padding: 0.9rem 1.25rem 1rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.callout[dir="rtl"] {
  border-right-width: 5px;
  border-left-width: 1px;
  text-align: right;
  direction: rtl;
}

.callout[dir="ltr"] {
  border-left-width: 5px;
  border-right-width: 1px;
  text-align: left;
  direction: ltr;
}

/* Info Callout */
.callout.info {
  background-color: #f0f7ff;
  border-color: #bae6fd;
}
.callout.info[dir="rtl"] { border-right-color: #0284c7; }
.callout.info[dir="ltr"] { border-left-color: #0284c7; }
.callout.info .callout-title { color: #0369a1; }

/* Tip / Lightbulb Callout */
.callout.tip {
  background-color: #f0fdf4;
  border-color: #bbf7d0;
}
.callout.tip[dir="rtl"] { border-right-color: #16a34a; }
.callout.tip[dir="ltr"] { border-left-color: #16a34a; }
.callout.tip .callout-title { color: #15803d; }

/* Warning Callout */
.callout.warning {
  background-color: #fffbeb;
  border-color: #fde68a;
}
.callout.warning[dir="rtl"] { border-right-color: #d97706; }
.callout.warning[dir="ltr"] { border-left-color: #d97706; }
.callout.warning .callout-title { color: #b45309; }

/* Danger / Bug Callout */
.callout.danger {
  background-color: #fef2f2;
  border-color: #fecaca;
}
.callout.danger[dir="rtl"] { border-right-color: #dc2626; }
.callout.danger[dir="ltr"] { border-left-color: #dc2626; }
.callout.danger .callout-title { color: #b91c1c; }

/* Note Callout */
.callout.note {
  background-color: #f8fafc;
  border-color: #cbd5e1;
}
.callout.note[dir="rtl"] { border-right-color: #475569; }
.callout.note[dir="ltr"] { border-left-color: #475569; }
.callout.note .callout-title { color: #334155; }

.callout-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.callout-icon {
  font-size: 1.15rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
}

.callout-content {
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--text-body);
}

.callout-content p {
  margin-bottom: 0.6rem;
}

.callout-content p:last-child {
  margin-bottom: 0;
}

/* Wikilinks */
.wikilink {
  color: var(--accent-tech-dark);
  font-weight: 600;
  border-bottom: 1px dotted var(--accent-tech);
  text-decoration: none;
}

.wikilink:hover {
  text-decoration: none;
  background-color: var(--accent-tech-dim);
}

/* Security / Password Gate */
.lock-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  background-color: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.lock-box {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2.25rem;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.12);
  text-align: center;
}

.lock-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 1.15rem;
  color: var(--accent-tech);
}

.lock-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.45rem;
}

.lock-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.35rem;
  line-height: 1.6;
}

.lock-input {
  width: 100%;
  background-color: #ffffff;
  border: 1px solid var(--border-dark);
  color: var(--text-main);
  padding: 0.75rem 1rem;
  font-size: 1.1rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  outline: none;
  margin-bottom: 1rem;
  text-align: center;
  letter-spacing: 0.2em;
  transition: border-color 0.15s ease;
}

.lock-input:focus {
  border-color: var(--accent-tech);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.1);
}

.lock-btn {
  width: 100%;
  background-color: var(--accent-tech);
  color: #ffffff;
  border: none;
  padding: 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.lock-btn:hover {
  background-color: var(--accent-tech-dark);
}

.lock-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  display: none;
  font-weight: 500;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2.25rem 1.25rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  background-color: var(--bg-secondary);
}

/* Mobile & Tablet Responsiveness */
@media (max-width: 820px) {
  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  
  .nav-links {
    width: 100%;
    justify-content: space-between;
    font-size: 0.82rem;
  }

  .mobile-vault-bar {
    display: flex;
  }

  .vault-layout {
    flex-direction: column;
  }

  .vault-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
  }

  .vault-sidebar.mobile-open {
    max-height: 380px;
    overflow-y: auto;
  }

  .vault-article {
    padding: 1.5rem 1rem 4rem;
  }

  .profile-name {
    font-size: 1.75rem;
  }
}