/* ===== Animation Frames ====== */
@keyframes blink-caret {

  from,
  to {
    border-color: transparent;
  }

  50% {
    border-color: var(--color-primary);
  }
}

@keyframes contentFadeIn {
  from {
    opacity: 0;
    transform: translateY(15px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== Font Set ====== */
@font-face {
  font-family: 'FKGroteskNeue';
  src: url('fonts/FKGroteskNeue.woff2') format('woff2');
}

@font-face {
  font-family: 'valorant';
  src: url('fonts/Valorant\ Font.ttf') format('truetype');
}

:root {
  /* ===== Primitive Color Tokens ====== */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-gray-50: rgba(249, 250, 251, 1);
  --color-gray-100: rgba(243, 244, 246, 1);
  --color-gray-200: rgba(229, 231, 235, 1);
  --color-gray-300: rgba(209, 213, 219, 1);
  --color-gray-400: rgba(156, 163, 175, 1);
  --color-gray-500: rgba(107, 114, 128, 1);
  --color-gray-600: rgba(75, 85, 99, 1);
  --color-gray-700: rgba(55, 65, 81, 1);
  --color-gray-800: rgba(31, 41, 55, 1);
  --color-gray-900: rgba(17, 24, 39, 1);

  --color-blue-400: rgba(96, 165, 250, 1);
  --color-blue-500: rgba(59, 130, 246, 1);
  --color-blue-600: rgba(37, 99, 235, 1);
  --color-blue-700: rgba(29, 78, 216, 1);

  --color-red-500: rgba(239, 68, 68, 1);
  --color-red-400: rgba(248, 113, 113, 1);

  /* ===== RGB versions for opacity control ====== */
  --color-blue-500-rgb: 59, 130, 246;
  --color-blue-400-rgb: 96, 165, 250;
  --color-gray-800-rgb: 31, 41, 55;
  --color-gray-900-rgb: 17, 24, 39;
  --color-red-500-rgb: 239, 68, 68;
  --color-red-400-rgb: 248, 113, 113;

  /* ===== Common style patterns ====== */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23374151' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23d1d5db' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* ===== Typography ====== */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 16px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 30px;
  --font-size-4xl: 44px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* ===== Spacing ====== */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* ===== Border Radius ====== */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* ===== Shadows ====== */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* ===== Animation Time ====== */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* ===== Layout ====== */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* ===== Light mode colors ====== */
body.light-mode {
  --color-background: var(--color-white);
  --color-surface: var(--color-gray-50);
  --color-text: var(--color-gray-800);
  --color-text-secondary: var(--color-gray-500);
  --color-primary: var(--color-blue-600);
  --color-primary-hover: var(--color-blue-700);
  --color-primary-active: var(--color-blue-700);
  --color-secondary: var(--color-gray-100);
  --color-secondary-hover: var(--color-gray-200);
  --color-secondary-active: var(--color-gray-300);
  --color-border: var(--color-gray-200);
  --color-btn-primary-text: var(--color-white);
  --color-btn-secondary-text: rgb(0, 0, 0);
  --color-btn-background: rgba(17, 24, 39, 0.055);
  --color-card-border: var(--color-gray-200);
  --color-card-border-inner: var(--color-gray-200);
  --color-error: var(--color-red-500);
  --color-focus-ring: rgba(var(--color-blue-500-rgb), 0.4);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);
  --color-btn-secondary-hover-text: var(--color-black);
}

/* ===== Dark mode colors ====== */
body.dark-mode {
  --color-background: var(--color-gray-900);
  --color-surface: var(--color-gray-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: var(--color-gray-400);
  --color-primary: var(--color-blue-400);
  --color-primary-hover: var(--color-blue-500);
  --color-primary-active: var(--color-blue-500);
  --color-secondary: rgba(255, 255, 255, 0.05);
  --color-secondary-hover: rgba(255, 255, 255, 0.1);
  --color-secondary-active: rgba(255, 255, 255, 0.15);
  --color-border: var(--color-gray-700);
  --color-btn-primary-text: var(--color-gray-900);
  --color-btn-secondary-text: rgb(255, 255, 255);
  --color-btn-background: rgba(17, 24, 39, 0.3);
  --color-card-border: var(--color-gray-7000);
  --color-card-border-inner: var(--color-gray-700);
  --color-error: var(--color-red-400);
  --color-focus-ring: rgba(var(--color-blue-400-rgb), 0.4);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-btn-secondary-hover-text: var(--color-white);
}

/* ===== Base styles ====== */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  color: var(--color-text);
  background-color: var(--color-background);
}

body {
  transition: background-color var(--duration-normal), color var(--duration-normal);
}

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

/* ===== Typography ====== */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-16) 0;
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

/* ===== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  border: none;
  text-decoration: none;
  position: relative;
  transition: all var(--duration-normal) var(--ease-standard);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--secondary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.btn--secondary:hover {
  background: var(--color-primary-active);
  color: var(--color-btn-secondary-hover-text);
}

.btn--secondary:active {
  background: var(--color-primary-active);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  background: var(--color-secondary);
  color: var(--color-primary-active);
}

.btn--sm {
  padding: var(--space-4) var(--space-12);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

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

.btn--icon {
  gap: var(--space-8);
}

.btn--icon img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

/* ===== Form elements ====== */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: 0;
  box-shadow: var(--focus-ring);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* ===== Container layout ====== */
.container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* ===== Utility classes ====== */
.hidden {
  display: none !important;
}

/* ===== Accessibility ====== */
:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* ===== Header ====== */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(var(--color-background), 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: all var(--duration-normal) var(--ease-standard);
}

/* ===== Navigation Bar ====== */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.nav__brand h2 {
  color: var(--color-text);
  margin: 0;
  font-weight: var(--font-weight-bold);
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 1px;
}

.nav__menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-32);
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 1px;
  transition: all var(--duration-normal) var(--ease-standard);
}

.nav__link {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  position: relative;
  padding-bottom: var(--space-4);
  transition: color var(--duration-fast) var(--ease-standard);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--duration-normal) var(--ease-standard);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__link.active {
  color: var(--color-primary);
}

.nav_right_cluster {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: var(--space-4);
  cursor: pointer;
}

.nav__toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-text);
  transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

.nav__toggle.active span:nth-child(1) {
  width: 28px;
  transform: translateY(10px) rotate(45deg);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
  width: 0;
}

.nav__toggle.active span:nth-child(3) {
  width: 28px;
  transform: translateY(-10px) rotate(-45deg);
}

/* ===== Theme Toggle Button ====== */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  transition: all var(--duration-fast);
}

.theme-toggle:hover {
  background-color: var(--color-secondary);
}

.hero__overlay {
  transition: background-color var(--duration-normal);
}

/* ===== Hide both icons by default ====== */
.theme-icon-sun,
.theme-icon-moon {
  display: none;
}

body.light-mode .theme-icon-moon {
  display: inline-block;
}

body.dark-mode .theme-icon-sun {
  display: inline-block;
}

/* ===== General Section Styling ====== */
section {
  padding: 100px 0;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-background);
}

section:last-of-type {
  border-bottom: none;
}

.section__title {
  text-align: center;
  margin-bottom: var(--space-32);
  font-size: var(--font-size-3xl);
  color: var(--color-text);
}

.section__title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background-color: var(--color-primary);
  margin: var(--space-8) auto 0;
}

/* ===== Hero Section ====== */
.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero__video-background {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  z-index: 0;
}

.hero__container {
  position: relative;
  z-index: 2;
}

.hero__content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-32);
  align-items: center;
}

.hero__image {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ===== Dark Mode (Default) Styles ====== */
.hero__video--light {
  display: none;
}

.hero__video--dark {
  display: block;
}

.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 1;
}

.hero__title {
  font-family: 'Obitron', sans-serif;
  font-weight: 700;
  /* Bolder weight for impact */
  letter-spacing: 2px;
  color: var(--color-blue-400);
  text-shadow: 0px 1px 4px rgba(0, 0, 0, 0.5);
}

.hero__subtitle,
.hero .btn--outline {
  color: var(--color-white);
}

.hero__intro {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  max-width: 700px;
  color: var(--color-white);
}

.hero__buttons {
  display: flex;
  gap: var(--space-24);
  margin-top: var(--space-32);
}

#typewriter-text {
  border-right-color: var(--color-blue-400);
}

.hero .btn--secondary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.hero .btn--secondary:hover {
  background: var(--color-primary-active);
  color: var(--color-btn-secondary-hover-text);
}

.hero .btn--secondary:active {
  background: var(--color-primary-active);
}

.hero .btn--outline {
  background: transparent;
  border: 1px solid var(--color-white);
  color: var(--color-white);
}

.hero .btn--outline:hover {
  background: var(--color-white);
  color: var(--color-gray-900);
}

.hero__photo {
  width: 400px;
  height: 400px;
  border-radius: 50%;
  padding: var(--space-8);
  background-color: rgba(var(--color-blue-400-rgb), 0.5);
}

.hero .photo-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: rgba(var(--color-gray-900-rgb), 0.5);
  color: var(--color-blue-400);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
}

/* ===== Light Mode Overrides ====== */
body.light-mode .hero__video--dark {
  display: none;
}

body.light-mode .hero__video--light {
  display: block;
}

body.light-mode .hero__overlay {
  background-color: rgba(255, 255, 255, 0.75);
}

body.light-mode .hero__title {
  color: var(--color-blue-700);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

body.light-mode .hero__subtitle,
body.light-mode .hero__intro,
body.light-mode .hero__tagline {
  color: var(--color-gray-900);
  text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
}

body.light-mode #typewriter-text {
  color: var(--color-gray-900);
  border-right-color: var(--color-blue-700);
}

body.light-mode .hero .btn--secondary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

body.light-mode .hero .btn--secondary:hover {
  background: var(--color-primary-active);
  color: var(--color-btn-secondary-hover-text);
}

body.light-mode .hero .btn--outline {
  background: transparent;
  border: 1px solid var(--color-gray-900);
  color: var(--color-gray-900);
}

body.light-mode .hero .btn--outline:hover {
  background: var(--color-gray-900);
  color: var(--color-white);
}

body.light-mode .hero__photo {
  background-color: rgba(var(--color-blue-500-rgb), 0.2);
}

body.light-mode .hero .photo-placeholder {
  background: rgba(255, 255, 255, 0.5);
  color: var(--color-blue-600);
}

/* ===== About Section ====== */
.about__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-32);
}

.about__image {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.about__content {
  max-width: 768px;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.about__photo {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background-color: var(--color-primary);
  padding: var(--space-4);
}

.about__photo .photo-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
}

.about__photo .photo-placeholder span {
  border-radius: 50%;
  transition: transform 0.3s ease;
}

.about__details-default {
  transition: transform 0.5s ease, opacity 0.5s ease;
  text-align: center;
}

.about__photo:hover .photo-placeholder span {
  transform: scale(1.2);
}

.about__text {
  font-size: var(--font-size-base);
  line-height: 1.7;
  margin-bottom: var(--space-20);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.about__highlights {
  display: flex;
  gap: var(--space-32);
  margin-top: var(--space-32);
  justify-content: center;
}

.highlight {
  text-align: center;
}

.highlight__number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-8);
}

.highlight__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.timline-buttons {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: var(--color-surface);
  padding: 4px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-border);
  margin-top: var(--space-12);
  margin-bottom: var(--space-32);
}

.timline-buttons .btn--certificate {
  border: 2px solid var(--color-border);
}

.timline-buttons .btn--certificate:hover {
  border: 2px solid var(--color-primary);
}


.tab-buttons {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  background: var(--color-surface);
  padding: var(--space-10);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-top: var(--space-24);

}

.tab-btn {
  padding: var(--space-10) var(--space-20);
  cursor: pointer;
  background-color: var(--color-btn-background);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  border: 2px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  display: flex;
  align-items: center;
  gap: var(--space-10);
  transition: all 0.25s ease-in-out;
}

.tab-btn:hover {
  color: var(--color-primary-active);
}

.tab-btn.active {
  border: 2px solid var(--color-primary);
  color: var(--color-btn-secondary-text);
  border-radius: var(--radius-md);
}

.tab-btn__icon {
  width: 24px;
  height: 24px;
}

.tab-btn__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tab-btn__text {
  font-size: 1rem;
  position: relative;
}

/* ===== Tab Content as a slide-in panel ====== */
.tab-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-background);
  z-index: 20;
  transform: translateX(100%);
  opacity: 0;
  transition: transform 0.5s ease, opacity 0.5s ease;
  overflow-y: auto;
  padding: var(--space-32);
}

.about__container.timeline-active .about__details-default {
  transform: translateX(-100%);
  opacity: 0;
}

.about__container.timeline-active .tab-content {
  transform: translateX(0);
  opacity: 1;
}

.timeline-close-btn {
  position: absolute;
  top: var(--space-16);
  right: var(--space-32);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 25;
}

.timeline-section {
  display: none;
  animation: contentFadeIn 0.4s ease;
}

.timeline-section.active {
  display: block;
}

.timeline__item {
  position: relative;
  padding-left: var(--space-32);
  margin-bottom: var(--space-24);
  text-align: left;
}

.timeline__item:last-child {
  margin-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 2px solid var(--color-surface);
}

.timeline__item::after {
  content: '';
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: -32px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline__item:last-child::after {
  display: none;
}

.timeline__title {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.timeline__subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  font-style: italic;
}

.timeline__date {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
}

.timeline__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  padding-left: 0;
  list-style-type: none;
  margin: 0;
}

.timeline__description li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
}

.timeline__description li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.timeline__description p {
  margin-bottom: 4px;
  color: var(--color-text-secondary);
}

.experience__timeline {
  position: relative;
  padding-left: var(--space-32);
  margin-bottom: var(--space-24);
  text-align: left;
}

.experience__timeline:last-child {
  margin-bottom: 0;
}

.experience__timeline::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: 2px solid var(--color-surface);
}

.experience__timeline::after {
  content: '';
  position: absolute;
  background-color: var(--color-border);
}

.experience__timeline:last-child::after {
  display: none;
}

/* ===== Skills Section ====== */
.skills {
  background-color: var(--color-surface);
}

.skills__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-32);
}

.skills__category-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-24);
  color: var(--color-text);
  text-align: center;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: var(--space-8);
}

.skills__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-20);
}

.skill {
  padding: 16px;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: default;
  overflow: hidden;
  transition: background-color var(--duration-fast) ease-in-out;
}

.skill:hover {
  background-color: var(--color-surface);
}

.skill__info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
  transition: margin-bottom var(--duration-normal) var(--ease-standard);
}

.skill:hover .skill__info {
  margin-bottom: var(--space-12);
}

.skill__name {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.skill__percentage {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  opacity: 0;
  transition: opacity var(--duration-fast) ease-in-out;
}

.skill:hover .skill__percentage {
  opacity: 1;
}

.skill__bar {
  height: 8px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.skill:hover .skill__bar {
  transform: scaleY(1);
}

.skill__progress {
  height: 100%;
  width: 0;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-blue-500) 0%, var(--color-blue-400) 100%);
  transition: width 0.8s var(--ease-standard);
}

.skill__identity {
  display: flex;
  align-items: center;
  gap: 12px;
}

.skill__icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

/* ===== Projects Section ====== */
.projects__filters {
  display: flex;
  justify-content: center;
  gap: var(--space-12);
  margin-bottom: var(--space-32);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-8) var(--space-20);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  transition: all var(--duration-normal) var(--ease-standard);
}

.filter-btn:hover {
  background: var(--color-secondary);
  border-color: var(--color-gray-300);
}

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-32);
  perspective: 1000px;
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.project-card__image {
  height: 200px;
  background-color: var(--color-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-placeholder {
  display: flex;
  width: 100px;
  height: 100px;
  transition: transform 0.3s ease;
}

.project-card__content {
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-12);
  color: var(--color-text);
}

.project-card__description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-16);
  flex-grow: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-bottom: var(--space-20);
}

.tag {
  padding: var(--space-4) var(--space-8);
  background: var(--color-secondary);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.project-card__buttons {
  display: flex;
  gap: var(--space-12);
  margin-top: auto;
}

/* ===== Services Section ====== */
.services {
  background-color: var(--color-surface);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-32);
  perspective: 1000px;
}

.service-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  padding: var(--space-32);
  border-radius: var(--radius-lg);
  text-align: center;
}

.service-card__icon {
  width: 50px;
  height: 50px;
  margin: 0 auto var(--space-24);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}

.service-card__icon img {
  max-width: 100%;
  height: auto;
}

.service-card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-16);
  color: var(--color-text);
}

.service-card__description {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.project-card:hover .project-placeholder,
.service-card:hover .service-card__icon {
  transform: scale(1.2);
}

.project-card,
.service-card {
  transition:
    transform 0.35s cubic-bezier(.18, .89, .32, 1.28),
    box-shadow 0.3s;
  will-change: transform;
  backface-visibility: hidden;
}

.project-card:hover,
.project-card:focus-visible,
.service-card:hover,
.service-card:focus-visible {
  transform:
    perspective(700px) scale(1.06) rotateX(10deg) rotateY(-8deg);
  box-shadow:
    0 18px 48px rgba(37, 99, 235, 0.15),
    0 3px 14px rgba(0, 0, 0, 0.05);
  z-index: 2;
}

/* ===== Contact Section ====== */
.contact__container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-32);
}

.contact__info h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-16);
  color: var(--color-text);
}

.contact__info>p {
  font-size: var(--font-size-base);
  line-height: 1.6;
  margin-bottom: var(--space-32);
}

.contact__item {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-20);
}

.contact__icon {
  font-size: 1.2rem;
  width: 40px;
  height: 40px;
  background-color: var(--color-surface);
  color: var(--color-btn-primary-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact__icon img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.contact__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.contact__value {
  font-size: var(--font-size-base);
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
}

.contact__social {
  display: flex;
  gap: var(--space-16);
  margin-top: var(--space-32);
}

.contact__item:hover .contact__icon,
.contact__item:hover .contact__value {
  color: var(--color-primary);
}

.contact__item:hover .contact__label {
  color: var(--color-text);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: 0;
  box-shadow: 0 0 0 4px rgba(var(--color-blue-500-rgb), 0.2);
}

.social-link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: var(--font-weight-medium);
  transition: color 0.2s ease-in-out;
}

.social-link:hover {
  color: var(--color-primary);
}

.social-link img {
  width: 24px;
  height: 24px;
  transition: transform 0.2s ease-in-out;
}

.social-link:hover img {
  transform: scale(1.15);
}

.error-message {
  display: block;
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--space-4);
  min-height: 20px;
}

/* Footer */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-32) 0;
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: flex-start;
  margin-bottom: var(--space-32);
}


.footer__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer h4 {
  margin-bottom: var(--space-16);
  color: var(--color-text);
}

.footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer li {
  margin-bottom: var(--space-8);
}

.footer a {
  color: var(--color-text-secondary);
  display: inline-block;
  transition: color 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.footer a:hover {
  color: var(--color-primary);
  text-decoration: none;
  transform: scale(1.08);
}

.footer__bottom {
  text-align: center;
  padding-top: var(--space-24);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.footer__social {
  justify-self: end;
  text-align: left;
}

.footer .social-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-12);
}

.footer .social-link {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
}

.footer .social-link:hover {
  transform: none;
}

/* ===== Responsive Design ====== */
@media (max-width: 992px) {
  .hero__image {
    order: -1;
    margin-bottom: var(--space-24);
    margin-top: 4rem;
  }

  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .about__content {
    text-align: center;
  }

  .about__text-wrapper {
    text-align: center;
  }

  .hero__buttons {
    justify-content: center;
  }

  .about__image {
    margin: 0 auto;
  }

  .about__highlights {
    justify-content: center;
  }

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

  .tab-buttons {
    padding: var(--space-6);
    gap: var(--space-6);
    justify-content: center;
  }

  .tab-btn {
    padding: var(--space-2) var(--space-8);
    font-size: var(--font-size-sm);
  }

  .footer__content {
    grid-template-columns: 1fr;
    gap: var(--space-32);
    text-align: center;
  }

  .footer__links,
  .footer__social {
    justify-self: center;
    text-align: center;
  }

  .footer .social-links {
    justify-content: center;
    flex-direction: row;
    align-items: center;
    gap: var(--space-24);
  }

  .contact__info {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

}

@media (max-width: 768px) {

  .project-card:hover,
  .project-card:focus-visible,
  .service-card:hover,
  .service-card:focus-visible {
    transform: none;
    box-shadow: none;
    z-index: 1;
  }

  .nav__menu {
    position: fixed;
    top: 65px;
    left: 0;
    width: 100%;
    background: var(--color-surface);
    flex-direction: column;
    align-items: center;
    padding: var(--space-32) 0;
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .hero__photo {
    width: 280px;
    height: 280px;
  }

  .about__photo {
    width: 240px;
    height: 240px;
  }

  .nav__toggle {
    border: none;
    background: transparent;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    cursor: pointer;
  }

  .nav__toggle span {
    display: block;
    width: 20px;
    height: 4px;
    background-color: var(--color-text);
    border-radius: var(--radius-full);
  }

  .nav__toggle span:nth-child(2) {
    width: 28px;
  }

  .nav__toggle.active span:nth-child(1) {
    width: 28px;
    transform: translateY(10px) rotate(45deg);
  }

  .nav__toggle.active span:nth-child(2) {
    opacity: 0;
    width: 0;
  }

  .nav__toggle.active span:nth-child(3) {
    width: 28px;
    transform: translateY(-10px) rotate(-45deg);
  }

  .skills__container,
  .projects__grid,
  .services__grid {
    grid-template-columns: 1fr;
  }

  .tab-btn {
    padding: var(--space-12);
  }

  .timeline-close-btn {
    top: var(--space-8);
    right: var(--space-8);
    width: 24px;
    height: 24px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  section {
    padding: 60px 0;
  }

  .hero__title {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: 1.2rem;
  }

  .section__title {
    font-size: 1.8rem;
  }

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

  .hero__buttons {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .hero__buttons .btn {
    width: 100%;
    max-width: 200px;
  }
}

.project-card.hidden {
  transform: scale(0.9);
  opacity: 0;
  display: none;
}

#typewriter-text {
  border-right: 3px solid var(--color-primary);
  padding-right: 4px;
  display: inline-block;
  vertical-align: bottom;
  animation: blink-caret .75s step-end infinite;
}

/* ===== Code Snippet Modal Styles ====== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-content {
  background: var(--color-surface);
  padding: var(--space-32);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(1);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.modal-overlay.hidden .modal-content {
  transform: scale(0.9);
}

.modal-close-btn {
  position: absolute;
  top: var(--space-16);
  right: var(--space-16);
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.modal-code-container pre[class*="language-"] {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  max-height: 60vh;
}

.modal-title-header {
  margin-bottom: var(--space-16);
}

.code-lang-tabs {
  display: flex;
  align-items: center;
  overflow-x: auto;
  flex-shrink: 0;
  padding-bottom: 8px;
}

.code-lang-tabs .tab-btn {
  background: none;
  border: none;
  padding: var(--space-8) var(--space-12);
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  flex-shrink: 0;
}

.code-lang-tabs .tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background-color: transparent;
}

#modal-code-block-pre {
  margin-top: var(--space-16);
  flex-grow: 1;
  max-height: 65vh;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
}

/* ===== Loading Screen Styles ====== */
body.loading {
  overflow: hidden;
}

.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--color-background);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.75s ease, visibility 0.75s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader__content {
  width: 300px;
  text-align: center;
  color: var(--color-text);
}

.loader__brand h1 {
  font-family: 'Obitron', sans-serif;
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-text);
}

.loader__brand p {
  font-family: 'Orbitron', sans-serif;
  font-size: 1rem;
  letter-spacing: 3px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.loader__percentage {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.loader__progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  margin: 0.5rem 0;
  overflow: hidden;
}

.loader__progress {
  width: 0%;
  height: 100%;
  background: var(--color-primary);
  transition: width 0.3s ease-out;
}

.loader__status {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* ===== Custom Cursor ====== */
html,
body,
a,
button,
.btn,
.tab-btn,
.filter-btn,
.skill,
.theme-toggle,
.source-code-btn,
.modal-close-btn,
.nav__toggle,
.social-link,
.project-card,
.contact__container,
.footer,
.service-card {
  cursor: url('images/default-cursor.png') 0 0, auto;
}

input[type="text"],
input[type="email"],
textarea {
  cursor: url('images/text-cursor.png') 0 0, text;
}

/* ===== Custom Scrollbar ====== */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-blue-500) 0%, var(--color-blue-400) 100%);
  border-radius: var(--radius-full);
  border: 3px solid var(--color-surface);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--color-blue-400) 0%, var(--color-blue-500) 100%);
  background-clip: content-box;
  border: 2px solid transparent;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

/* ===== Image fixes ====== */
.photo-placeholder img,
.hero__photo .photo-placeholder img,
.about__photo .photo-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.hero__photo .photo-placeholder,
.about__photo .photo-placeholder {
  background: transparent;
}

/* ===== Animation Classes ====== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}