/* ===== CSS Custom Properties ===== */
:root {
  --color-bg: #faf8f5;
  --color-bg-alt: #f3f0eb;
  --color-text: #2d2d2d;
  --color-text-light: #6b6b6b;
  --color-text-lighter: #999;
  --color-primary: #0d7377;
  --color-primary-dark: #095c5f;
  --color-accent: #e07a5f;
  --color-white: #ffffff;
  --color-border: #e8e4df;
  --color-shadow: rgba(0, 0, 0, 0.06);

  --font-heading: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --max-width: 1100px;
  --header-height: 70px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

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

/* ===== Utility ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
}

.section__header {
  text-align: center;
  margin-bottom: 3rem;
}

.section__title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.section__subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 115, 119, 0.3);
}

.btn--outline {
  border-color: var(--color-text);
  color: var(--color-text);
}

.btn--outline:hover {
  background: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-2px);
}

/* ===== Header & Navigation ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px var(--color-shadow);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.nav__list {
  display: flex;
  gap: 2.5rem;
}

.nav__link {
  font-size: 0.95rem;
  color: var(--color-text);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--transition);
}

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

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

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

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}

.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition);
  border-radius: 2px;
}

.nav__toggle.active .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav__toggle.active .nav__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.5)), url('../images/background.png') center/cover no-repeat;
    background-attachment: fixed;
    padding-top: var(--header-height);
}

.hero__greeting {
  display: inline-block;
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.6s ease;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.1;
  margin-bottom: 1rem;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__subtitle {
  font-size: 1.3rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 1rem;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__desc {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: 500px;
  margin: 0 auto 2rem;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero__scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.hero__scroll-indicator span {
  display: block;
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--color-text-lighter);
  border-bottom: 2px solid var(--color-text-lighter);
  transform: rotate(45deg);
}

/* ===== Blog Section ===== */
.blog {
  background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.5)), url('../images/background.png') center/cover no-repeat;
  background-attachment: fixed;
}

.blog__search {
  position: relative;
  max-width: 400px;
  margin: 0 auto 3rem;
}

.blog__search-input {
  width: 100%;
  padding: 0.9rem 1rem 0.9rem 2.75rem;
  border: 2px solid var(--color-border);
  border-radius: 50px;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.blog__search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(13, 115, 119, 0.1);
}

.blog__search-input::placeholder {
  color: var(--color-text-lighter);
}

.blog__search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-lighter);
  pointer-events: none;
}

.blog__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.blog__empty {
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.1rem;
  padding: 3rem 0;
}

/* Blog Card */
.blog-card {
    background: linear-gradient(rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.5)), url('../images/final.png') center/cover no-repeat;
    background-attachment: fixed;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

.blog-card__image {
    height: 180px;
    display: flex;
    align-items: flex-start;
    justify-content: flex-end;
    padding: 1rem;
    position: relative;
    overflow: hidden;
    background: transparent !important;
}

.blog-card__tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-text);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 50px;
  backdrop-filter: blur(4px);
}

.blog-card__body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card__date {
  font-size: 0.85rem;
  color: var(--color-text-lighter);
  margin-bottom: 0.5rem;
}

.blog-card__title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.blog-card__excerpt {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 1rem;
}

.blog-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.blog-card__read-time {
  font-size: 0.8rem;
  color: var(--color-text-lighter);
}

.blog-card__link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: color var(--transition);
}

.blog-card__link:hover {
  color: var(--color-primary-dark);
}

/* ===== About Section ===== */
.about {
    background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.5)), url('../images/background.png') center/cover no-repeat;
    background-attachment: fixed;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: center;
}

.about__image-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.about__image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 12px 40px rgba(13, 115, 119, 0.2);
}

.about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;

}

.about__social {
  display: flex;
  gap: 1rem;
}

.about__social-link {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: all var(--transition);
}

.about__social-link svg {
  width: 18px;
  height: 18px;
}

.about__social-link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-3px);
}

.about__text .section__title {
  text-align: left;
  margin-bottom: 1.5rem;
}

.about__text p {
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
  font-size: 0.98rem;
}

/* ===== Contact Section ===== */
.contact {
    background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.5)), url('../images/background.png') center/cover no-repeat;
    background-attachment: fixed;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  max-width: 900px;
  margin: 0 auto;
}

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

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

.contact__label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.contact__input,
.contact__textarea {
  padding: 0.85rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.contact__input:focus,
.contact__textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(13, 115, 119, 0.1);
}

.contact__textarea {
  resize: vertical;
  min-height: 120px;
}

.contact__submit {
  align-self: flex-start;
}

.contact__success {
  color: var(--color-primary);
  font-weight: 500;
  margin-top: 0.5rem;
}

.contact__info {
  display: flex;
  align-items: flex-start;
}

.contact__card {
  background: var(--color-bg);
  padding: 2rem;
  border-radius: var(--radius-md);
  width: 100%;
}

.contact__card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.contact__card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.contact__github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-text);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition);
}

.contact__github-link:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 0;
}

.footer__content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer__tagline {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.footer__links h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer__links a {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.6rem;
  transition: color var(--transition);
}

.footer__links a:hover {
  color: var(--color-accent);
}

.footer__bottom {
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
}

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(13, 115, 119, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== Responsive: Tablet ===== */
@media (max-width: 1024px) {
  .blog__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about__grid {
    gap: 2rem;
  }
}

/* ===== Responsive: Mobile ===== */
@media (max-width: 768px) {
  .section {
    padding: 4rem 0;
  }

  .section__title {
    font-size: 2rem;
  }

  /* Mobile nav */
  .nav__toggle {
    display: flex;
  }

  .nav__list {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: var(--color-white);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    transition: right var(--transition);
    box-shadow: -10px 0 40px var(--color-shadow);
  }

  .nav__list.show {
    right: 0;
  }

  .nav__link {
    font-size: 1.1rem;
  }

  /* Blog */
  .blog__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .about__image {
    width: 160px;
    height: 160px;
  }

  /* Contact */
  .contact__grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
  }
}