@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;700&family=Inter:wght@400;500;600;700&display=swap");

/* ===== CSS Variables ===== */
:root {
  --color-background: #111827;
  --color-surface: #1f2937;
  --color-border: #374151;
  --color-text: #f3f4f6;
  --color-text-muted: #9ca3af;
  --color-primary: #3b82f6;
  --color-home: #3b82f6;
  --color-experience: #34d399;
  --color-projects: #f472b6;
  --color-contact: #fbbf24;
  --max-width: 1100px;
  --nav-height: 64px;
  --radius: 8px;
}

/* ===== Base Styles ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-background);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* ===== Navigation ===== */
nav {
  position: fixed;
  width: 100%;
  top: 0;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

nav ul {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  list-style: none;
}

nav ul li a {
  display: block;
  padding: 20px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
  position: relative;
}

nav ul li a::before {
  content: attr(data-text);
  position: absolute;
  left: 16px;
  top: 20px;
  color: var(--color);
  width: 0;
  overflow: hidden;
  transition: 0.5s;
  border-right: 2px solid var(--color);
}

nav ul li a:hover::before {
  width: calc(100% - 32px);
}

/* ===== Hamburger Menu ===== */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 101;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Section Base ===== */
section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  scroll-margin-top: var(--nav-height);
}

section h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}

section > h1::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 3px;
  background: currentColor;
  margin-right: 12px;
  vertical-align: middle;
  border-radius: 2px;
}

/* ===== Home Section ===== */
#home {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: var(--nav-height);
  padding-bottom: 0;
}

#home .hero-content {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: center;
}

#home .hero-text {
  max-width: 640px;
}

#home .hero-photo {
  width: 280px;
  height: 280px;
  border-radius: 16px;
  overflow: hidden;
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.2);
  opacity: 0;
  animation: fadeIn 0.5s ease 0.2s forwards;
}

#home .hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#home .hero-photo .photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 100%);
  font-family: "Space Grotesk", sans-serif;
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.05em;
}

#home h1 {
  font-family: "Space Grotesk", "Inter", -apple-system, sans-serif;
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

#home h1 .name {
  color: var(--color-home);
}

#home .typing-container {
  font-family: "Space Grotesk", "Inter", -apple-system, sans-serif;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
  opacity: 0;
  animation: fadeIn 0.5s ease 0.05s forwards;
}

#home .typing-text {
  color: var(--color-home);
}

#home .cursor {
  color: var(--color-home);
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}

#home .tagline {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeIn 0.5s ease 0.1s forwards;
}

#home .intro {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeIn 0.5s ease 0.15s forwards;
}

#home .status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  opacity: 0;
  animation: fadeIn 0.5s ease 0.2s forwards;
}

#home .status-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
}

#home .status-item i {
  font-size: 0.75rem;
  color: var(--color-primary);
}

#home .status-available {
  color: var(--color-experience);
}

#home .status-available .pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--color-experience);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(1.1);
  }
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

/* ===== Experience Section ===== */
#experience h1 {
  color: var(--color-experience);
}

#experience .tablist {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

#experience .tablist .tablist-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--color-text);
}

#experience .tablist .tablist-content {
  display: flex;
  gap: 32px;
}

#experience .tablist .tablist-content .list {
  display: flex;
  flex-direction: column;
  min-width: 160px;
  position: relative;
}

#experience .tablist .tablist-content .list label {
  height: 40px;
  display: flex;
  align-items: center;
  padding: 0 16px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
  z-index: 2;
}

#experience .tablist .tablist-content .list label:hover {
  color: var(--color-experience);
}

#experience .tablist .tablist-content .indicator {
  position: absolute;
  left: 0;
  top: 0;
  height: 40px;
  width: 100%;
  background: rgba(52, 211, 153, 0.1);
  border-left: 2px solid var(--color-experience);
  border-radius: 0 4px 4px 0;
  transition: top 0.15s ease;
}

#experience .tablist .tablist-content .text-content {
  flex: 1;
}

#experience .tablist .tablist-content .text-content .text {
  display: none;
}

#experience .tablist .tablist-content .text-content .text .title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

#experience .tablist .tablist-content .text-content .text .title a {
  color: var(--color-experience);
  text-decoration: none;
  transition: opacity 0.15s ease;
}

#experience .tablist .tablist-content .text-content .text .title a:hover {
  opacity: 0.8;
}

#experience .tablist .tablist-content .text-content .text .date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

#experience .tablist .tablist-content .text-content .text ul {
  color: var(--color-text-muted);
  padding-left: 20px;
}

#experience .tablist .tablist-content .text-content .text ul li {
  margin-bottom: 12px;
  font-size: 0.875rem;
  line-height: 1.6;
}

#experience .tablist .tablist-content .text-content .job1 {
  display: block;
}

#experience .tablist .tablist-content input {
  display: none;
}

#experience .tablist #job1:checked ~ .list label.job1,
#experience .tablist #job2:checked ~ .list label.job2,
#experience .tablist #job3:checked ~ .list label.job3,
#experience .tablist #job4:checked ~ .list label.job4,
#experience .tablist #job5:checked ~ .list label.job5 {
  color: var(--color-experience);
}

#experience .tablist #job1:checked ~ .list .indicator {
  top: 0;
}

#experience .tablist #job2:checked ~ .list .indicator {
  top: 40px;
}

#experience .tablist #job3:checked ~ .list .indicator {
  top: 80px;
}

#experience .tablist #job4:checked ~ .list .indicator {
  top: 120px;
}

#experience .tablist #job5:checked ~ .list .indicator {
  top: 160px;
}

#experience .tablist #job1:checked ~ .text-content .job1,
#experience .tablist #job2:checked ~ .text-content .job2,
#experience .tablist #job3:checked ~ .text-content .job3,
#experience .tablist #job4:checked ~ .text-content .job4,
#experience .tablist #job5:checked ~ .text-content .job5 {
  display: block;
}

#experience .tablist #job2:checked ~ .text-content .job1,
#experience .tablist #job3:checked ~ .text-content .job1,
#experience .tablist #job4:checked ~ .text-content .job1,
#experience .tablist #job5:checked ~ .text-content .job1 {
  display: none;
}

#experience .experience-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

#experience .experience-tags span {
  padding: 4px 8px;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-background);
  border-radius: 4px;
}

/* ===== Projects Section ===== */
#projects h1 {
  color: var(--color-projects);
}

#projects .projects {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

#projects .projects .project {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

#projects .projects .project:hover {
  border-color: var(--color-projects);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(244, 114, 182, 0.1);
}

#projects .projects .project .project-image {
  aspect-ratio: 16/10;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

#projects .projects .project .project-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.15);
  pointer-events: none;
}

#projects .projects .project .project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.15s ease;
}

#projects .projects .project:hover .project-image img {
  transform: scale(1.02);
}

#projects .projects .project .project-content {
  padding: 16px;
}

#projects .projects .project .project-content h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

#projects .projects .project .project-content p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 12px;
}

#projects .projects .project .project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

#projects .projects .project .project-tags span {
  padding: 4px 8px;
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-background);
  border-radius: 4px;
}

#projects .projects .project .project-links {
  display: flex;
  gap: 8px;
}

#projects .projects .project .project-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

#projects .projects .project .project-links a:hover {
  border-color: var(--color-text-muted);
  background: var(--color-border);
}

/* ===== Contact Section ===== */
#contact h1 {
  color: var(--color-contact);
}

#contact form {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

#contact form h1 {
  font-size: 1.25rem;
  text-align: center;
  margin-bottom: 8px;
  color: var(--color-contact);
}

#contact form .form-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  font-size: 1rem;
}

#contact form label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

#contact form input,
#contact form textarea {
  width: 100%;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--color-text);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 16px;
  outline: none;
  resize: vertical;
  transition: border-color 0.15s ease;
}

#contact form input:focus,
#contact form textarea:focus {
  border-color: var(--color-contact);
}

#contact form input::placeholder,
#contact form textarea::placeholder {
  color: var(--color-text-muted);
}

#contact form .center {
  text-align: center;
  margin-top: 8px;
}

#contact form input[type="submit"] {
  width: auto;
  padding: 12px 32px;
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-background);
  background: var(--color-contact);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

#contact form input[type="submit"]:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(251, 191, 36, 0.25);
}

#contact form input[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

#contact .form-result {
  text-align: center;
  padding: 12px 16px;
  margin-top: 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  display: none;
}

#contact .form-result.success {
  display: block;
  background: rgba(52, 211, 153, 0.15);
  border: 1px solid var(--color-experience);
  color: var(--color-experience);
}

#contact .form-result.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #ef4444;
  color: #ef4444;
}

/* ===== Footer ===== */
#footer {
  padding: 48px 24px;
  text-align: center;
}

#footer .links {
  display: flex;
  justify-content: center;
  gap: 16px;
}

#footer .links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  border-radius: 8px;
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease;
}

#footer .links a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

#footer .footer-note {
  margin-top: 24px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  #projects .projects {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  section {
    padding: 64px 24px;
  }

  #home .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  #home .hero-text {
    order: 2;
    max-width: none;
  }

  #home .hero-photo {
    order: 1;
    width: 200px;
    height: 200px;
    margin: 0 auto;
  }

  #home .status-bar {
    justify-content: center;
  }

  #home h1 {
    font-size: 2.25rem;
  }

  #home .typing-container {
    font-size: 1.25rem;
  }

  #home .tagline {
    font-size: 1.125rem;
  }

  /* Hamburger Menu - Show button */
  .hamburger {
    display: flex;
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
  }

  nav {
    position: relative;
    height: var(--nav-height);
  }

  nav ul {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(17, 24, 39, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  nav ul.open {
    max-height: 240px;
  }

  nav ul li a {
    padding: 16px 24px;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
  }

  nav ul li:last-child a {
    border-bottom: none;
  }

  nav ul li a::before {
    display: none;
  }

  nav ul li a:hover {
    color: var(--color);
  }

  #experience .tablist {
    padding: 24px;
  }

  #experience .tablist .tablist-content {
    flex-direction: column;
    gap: 24px;
  }

  #experience .tablist .tablist-content .list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  #experience .tablist .tablist-content .list label {
    height: auto;
    min-height: 44px;
    padding: 12px 16px;
    background: var(--color-background);
    border-radius: 6px;
  }

  #experience .tablist .tablist-content .indicator {
    display: none;
  }

  #projects .projects .project .project-links a {
    padding: 12px 16px;
    min-height: 44px;
  }

  #contact form {
    padding: 24px;
  }
}

@media (max-width: 600px) {
  #projects .projects {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  #home h1 {
    font-size: 1.875rem;
  }

  #home .typing-container {
    font-size: 1.125rem;
  }

  #home .hero-photo {
    width: 160px;
    height: 160px;
  }

  #home .tagline {
    font-size: 1rem;
  }

  #home .intro {
    font-size: 0.9375rem;
  }

  #home .status-bar {
    gap: 8px;
  }

  #home .status-item {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  section h1 {
    font-size: 1.5rem;
    margin-bottom: 24px;
  }

  section > h1::before {
    width: 16px;
    margin-right: 8px;
  }
}

@media (max-width: 480px) {
  #home h1 {
    font-size: 1.625rem;
  }

  #home .typing-container {
    font-size: 1rem;
  }

  #home p {
    font-size: 1rem;
  }

  section h1 {
    font-size: 1.375rem;
  }

  section {
    padding: 48px 16px;
  }

  #experience .tablist {
    padding: 16px;
  }

  #contact form {
    padding: 16px;
  }

  #contact form input[type="submit"] {
    width: 100%;
  }

  #footer {
    padding: 32px 16px;
  }
}

@media (max-width: 360px) {
  #home h1 {
    font-size: 1.5rem;
  }

  #home .typing-container {
    font-size: 0.9375rem;
  }

  section h1 {
    font-size: 1.25rem;
  }

  .hamburger {
    right: 16px;
  }

  nav ul li a {
    padding: 14px 16px;
    font-size: 0.8125rem;
  }
}