/* Modern Neutral CSS for payamsiyari.github.io (No Blue Tint) */

/* ==========================================================================
   1. Design Tokens & CSS Variables
   ========================================================================== */
:root {
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;

  /* Color Palette - Neutral Light Mode */
  --bg-main: #f4f4f5;
  --surface-card: #ffffff;
  --surface-card-hover: #fafafa;
  --surface-border: #e4e4e7;
  --surface-border-hover: #71717a;

  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #71717a;

  --accent-primary: #18181b;
  --accent-secondary: #3f3f46;
  --accent-gradient: linear-gradient(135deg, #18181b 0%, #3f3f46 100%);
  --accent-light: rgba(24, 24, 27, 0.05);
  --accent-light-hover: rgba(24, 24, 27, 0.1);

  --btn-primary-bg: #18181b;
  --btn-primary-text: #ffffff;

  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.08);
  --nav-bg: rgba(255, 255, 255, 0.9);

  /* Sleek, non-oval corner radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 8px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Deep Neutral Charcoal Dark Theme (Zero Blue Tint) */
[data-theme="dark"] {
  --bg-main: #121214;
  --surface-card: #1c1c20;
  --surface-card-hover: #24242a;
  --surface-border: #2e2e36;
  --surface-border-hover: #71717a;

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --accent-primary: #f4f4f5;
  --accent-secondary: #d4d4d8;
  --accent-gradient: linear-gradient(135deg, #ffffff 0%, #a1a1aa 100%);
  --accent-light: rgba(255, 255, 255, 0.06);
  --accent-light-hover: rgba(255, 255, 255, 0.12);

  --btn-primary-bg: #f4f4f5;
  --btn-primary-text: #121214;

  --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  --card-shadow-hover: 0 16px 32px rgba(0, 0, 0, 0.7);
  --nav-bg: rgba(28, 28, 32, 0.9);
}

/* Base Body Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Container Layout */
.app-container {
  max-width: 960px;
  width: 92%;
  margin: 0 auto;
  padding: 1.5rem 0 4rem 0;
  flex: 1;
}

/* ==========================================================================
   2. Header & Navigation
   ========================================================================== */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  background: var(--bg-main);
  transition: background-color var(--transition-normal);
}

.navbar {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 0.7rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--card-shadow);
  transition: border-color var(--transition-normal), background-color var(--transition-normal), box-shadow var(--transition-normal);
  z-index: 1000; /* ensure header stays on top */}

.navbar.scrolled {
  border-color: var(--surface-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand span.gradient-text {
  color: var(--text-primary);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-brand {
  order: 1;
}

.nav-menu {
  order: 2;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-left: auto;
}

.nav-controls {
  order: 3;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Hamburger toggle button (hidden on larger screens) */
.nav-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.4rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-bounce);
  position: relative;
  background: transparent;
  border: none;
  font-family: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover, .nav-dropdown-wrapper.active .nav-dropdown-btn {
  color: var(--text-primary);
  background-color: var(--accent-light);
  transform: translateY(-1px);
}

.nav-link:active {
  transform: scale(0.96);
}

/* Nav Dropdown Menu */
.nav-dropdown-wrapper {
  position: relative;
}

.dropdown-chevron {
  transition: transform var(--transition-fast);
}

.nav-dropdown-wrapper:hover .dropdown-chevron,
.nav-dropdown-wrapper.active .dropdown-chevron {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.4rem;
  width: 175px;
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  box-shadow: var(--card-shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px) scale(0.96);
  transition: all var(--transition-fast);
  z-index: 150;
  display: flex;
  flex-direction: column;
  padding: 0.35rem;
}

.nav-dropdown-wrapper:hover .dropdown-menu,
.nav-dropdown-wrapper.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.dropdown-item:hover {
  color: var(--text-primary);
  background-color: var(--accent-light);
}

.dropdown-item svg {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.dropdown-item:hover svg {
  color: var(--text-primary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.theme-toggle-btn:hover {
  border-color: var(--text-primary);
  transform: scale(1.05);
  box-shadow: var(--card-shadow-hover);
  color: var(--text-primary);
}

.theme-toggle-btn:active {
  transform: scale(0.92);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  position: absolute;
}

.sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

.moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

/* ==========================================================================
   3. Modern Link Hover & Click Animations (Neutral)
   ========================================================================== */
a.animated-link, .content-card a:not(.btn) {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
}

a.animated-link::after, .content-card a:not(.btn)::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: bottom right;
  transition: transform var(--transition-normal);
}

a.animated-link:hover::after, .content-card a:not(.btn):hover::after {
  transform: scaleX(1);
  transform-origin: bottom left;
}

a.animated-link:active, .content-card a:not(.btn):active {
  transform: scale(0.97);
  opacity: 0.9;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn-primary {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
  opacity: 0.95;
}

.btn-primary:active {
  transform: translateY(0) scale(0.97);
}

.btn-secondary {
  background: var(--surface-card);
  color: var(--text-primary) !important;
  border-color: var(--surface-border);
  box-shadow: var(--card-shadow);
}

.btn-secondary:hover {
  border-color: var(--text-primary);
  color: var(--text-primary) !important;
  background: var(--surface-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
}

.btn-secondary:active {
  transform: translateY(0) scale(0.97);
}

.ripple-circle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  transform: scale(0);
  animation: ripple 0.6s linear;
  pointer-events: none;
}

[data-theme="light"] .btn-secondary .ripple-circle {
  background: rgba(0, 0, 0, 0.15);
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ==========================================================================
   4. Hero Section Layout
   ========================================================================== */
.hero-card {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  box-shadow: var(--card-shadow);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2.2rem;
  align-items: center;
  margin-bottom: 1.8rem;
  transition: all var(--transition-normal);
}

.hero-card:hover {
  border-color: var(--surface-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.avatar-wrapper {
  position: relative;
}

.avatar-img {
  width: 170px;
  height: 170px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  border: 2px solid var(--surface-border);
  transition: transform var(--transition-bounce), border-color var(--transition-normal);
  display: block;
}

.hero-card:hover .avatar-img {
  transform: scale(1.02);
  border-color: var(--text-primary);
}

.hero-info {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.hero-title-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-light);
  color: var(--text-primary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  width: fit-content;
  border: 1px solid var(--surface-border);
}

.hero-name {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.15;
}

.hero-role {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.hero-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.hero-contact-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-action-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 0.8rem;
}

.org-logo-lg {
  width: 38px;
  height: 38px;
  object-fit: contain;
  border-radius: 4px;
  background-color: #ffffff !important;
  padding: 4px;
  border: 1px solid var(--surface-border);
}

/* Ensure logo background stays white and legible across themes */
.edu-item .org-logo-lg,
.edu-item .gt-logo,
img.org-logo-lg,
img.gt-logo {
  background-color: #ffffff !important;
  background: #ffffff !important;
  padding: 4px;
  border: 1px solid var(--surface-border);
  border-radius: 4px;
}

/* Center logos vertically in education list */
.edu-item .org-logo-lg {
  align-self: center;
}

.gt-logo {
  width: 48px;
  height: 48px;
  object-fit: cover;
  padding: 0;
  border: none;
  background: #fff;
}

/* ==========================================================================
   5. Content Cards & Grid
   ========================================================================== */
.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.content-card {
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-normal);
}

.content-card:hover {
  border-color: var(--surface-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--surface-border);
}

.section-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--accent-light);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--surface-border);
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-paragraph {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.card-paragraph:last-child {
  margin-bottom: 0;
}

/* Education List & Badges */
.education-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.edu-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.2rem;
  border-radius: var(--radius-md);
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.edu-item:hover {
  background: var(--surface-card-hover);
  border-color: var(--surface-border-hover);
  transform: translateY(-1px);
  box-shadow: var(--card-shadow-hover);
}

.edu-logo-wrapper {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff !important;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.edu-logo {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 2px;
}

.edu-content {
  flex: 1;
  min-width: 0;
}

.edu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.edu-program {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin: 0;
}

.edu-degree {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

.edu-school {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  line-height: 1.4;
}

/* Resume Callout */
.resume-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--accent-light);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.4rem;
  margin-top: 0.5rem;
}

.resume-box-text {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-primary);
  font-weight: 600;
}

.resume-box-actions {
  display: flex;
  gap: 0.6rem;
}

/* ==========================================================================
   6. Footer
   ========================================================================== */
.footer {
  margin-top: 3.5rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--surface-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

.footer-socials {
  display: flex;
  gap: 0.8rem;
}

.footer-social-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-social-icon:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
  transform: translateY(-2px);
}

.footer-social-icon:active {
  transform: scale(0.9);
}

/* ==========================================================================
   7. Responsive Tweaks
   ========================================================================== */
@media (max-width: 768px) {
  .hero-card {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .avatar-img {
    width: 140px;
    height: 140px;
  }

  .hero-name {
    font-size: 2rem;
  }

  .hero-role {
    justify-content: center;
  }

  .hero-contact {
    justify-content: center;
  }

  .hero-action-btns {
    justify-content: center;
  }

  /* Hamburger Navigation for Mobile */
  .navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem 1.2rem;
    z-index: 1000;
  }

  .nav-brand {
    order: 1;
  }

  .nav-controls {
    order: 2;
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .nav-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .nav-toggle-btn:hover {
    background-color: var(--accent-light);
    border-color: var(--text-primary);
  }

  .nav-menu {
    order: 3;
    display: none;
    width: 100%;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.8rem;
    padding-top: 0.8rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--surface-border);
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-links {
    display: flex;
    flex-direction: column;
    width: 100%;
    gap: 0.4rem;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.6rem 0.8rem;
  }

  .nav-dropdown-wrapper {
    width: 100%;
  }

  .nav-dropdown-btn {
    width: 100%;
    justify-content: space-between;
  }

  .dropdown-menu {
    position: static;
    width: 100%;
    box-shadow: none;
    border: 1px solid var(--surface-border);
    margin-top: 0.4rem;
  }

  .resume-box {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .resume-box-actions {
    width: 100%;
    justify-content: center;
  }
}

/* Mobile screens - refine education item layout */
@media (max-width: 540px) {
  .edu-item {
    align-items: flex-start;
    padding: 0.9rem 1rem;
    gap: 0.8rem;
  }

  .edu-logo-wrapper {
    width: 40px;
    height: 40px;
    margin-top: 0.1rem;
  }

  .edu-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }

  .edu-school {
    margin-top: 0.35rem;
    font-size: 0.85rem;
  }
}


/* ==========================================================================
   8. Scroll Reveal Fade In & Fade Out Animations
   ========================================================================== */
.scroll-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}