/* =========================================================
   PORTFOLIO - HUỲNH HỮU BẰNG
   Phong cách: Neo-brutalism / Neubrutalism
   ========================================================= */

/* ---------- CSS VARIABLES ---------- */
:root {
  /* Bảng màu */
  --color-bg: #fff8e7;
  --color-primary: #ffd166;
  --color-secondary: #ff6b6b;
  --color-accent: #4ecdc4;
  --color-extra: #a78bfa;
  --color-ink: #111111;
  --color-white: #ffffff;

  /* Viền & bóng đổ (Neo-brutalism) */
  --border-width: 4px;
  --border: var(--border-width) solid var(--color-ink);
  --shadow-offset: 6px;
  --shadow-hard: var(--shadow-offset) var(--shadow-offset) 0 var(--color-ink);
  --shadow-hard-sm: 4px 4px 0 var(--color-ink);
  --shadow-hard-lg: 10px 10px 0 var(--color-ink);

  /* Bo góc: giữ nhỏ để giữ nét "khối" của brutalism */
  --radius: 10px;

  /* Font */
  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;

  /* Khoảng cách */
  --container-width: 1140px;
  --section-padding: 100px;
}

/* ---------- RESET CƠ BẢN ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px; /* tránh navbar che mất section khi cuộn tới */
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.6;
  overflow-x: hidden; /* chống thanh cuộn ngang */
}

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

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

ul {
  list-style: none;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

/* Trạng thái focus rõ ràng cho khả năng truy cập */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* ---------- LỚP DÙNG CHUNG ---------- */
.section {
  padding: var(--section-padding) 20px;
  transition: background-color 0.4s ease;
}

/* Xen kẽ màu nền nhẹ giữa các section để việc chuyển section rõ ràng hơn khi cuộn */
.about {
  background-color: var(--color-bg);
}

.skills {
  background-color: #fffdf5;
}

.projects {
  background-color: var(--color-bg);
}

.contact {
  background-color: #fffdf5;
}

.section-container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 10px;
}

.title-mark {
  font-family: var(--font-display);
  font-size: 1rem;
  background: var(--color-ink);
  color: var(--color-primary);
  padding: 6px 12px;
  border-radius: 6px;
}

.section-subtitle {
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 48px;
  opacity: 0.8;
}

/* ---------- NÚT BẤM (BUTTON) ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: var(--color-white);
  color: var(--color-ink);
  cursor: pointer;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
  min-height: 48px; /* đủ lớn để bấm trên cảm ứng */
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--color-ink);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-ink);
}

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

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

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

.btn-sm {
  padding: 10px 18px;
  font-size: 0.9rem;
  min-height: 40px;
}

.btn-block {
  width: 100%;
}

/* =========================================================
   NAVIGATION
   ========================================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--color-bg);
  border-bottom: var(--border);
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
}

.logo-dot {
  color: var(--color-secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: 6px;
  transition:
    background 0.15s ease,
    transform 0.15s ease,
    box-shadow 0.15s ease,
    color 0.15s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: var(--color-primary);
  transform: translateY(-2px);
}

/* Trạng thái active: link tương ứng với section đang hiển thị trên màn hình */
.nav-link.is-active {
  background: var(--color-ink);
  color: var(--color-white);
  box-shadow: 3px 3px 0 var(--color-secondary);
}

.nav-link--cta.is-active {
  box-shadow: 3px 3px 0 var(--color-accent);
}

.nav-link--cta {
  background: var(--color-ink);
  color: var(--color-white);
  border: 2px solid var(--color-ink);
  box-shadow: 4px 4px 0 var(--color-secondary);
}

.nav-link--cta:hover {
  background: var(--color-secondary);
  color: var(--color-ink);
}

/* Nút hamburger (ẩn trên desktop) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  border: var(--border);
  border-radius: 8px;
  background: var(--color-primary);
  box-shadow: var(--shadow-hard-sm);
}

.hamburger-bar {
  width: 24px;
  height: 3px;
  background: var(--color-ink);
  border-radius: 2px;
  transition:
    transform 0.25s ease,
    opacity 0.25s ease;
}

/* Trạng thái mở của hamburger -> hình chữ X */
.hamburger.is-active .hamburger-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.is-active .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.hamburger.is-active .hamburger-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* =========================================================
   HERO SECTION
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 20px 60px;
  overflow: hidden;
}

.hero-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 40px;
  position: relative;
  z-index: 2;
}

.badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--color-accent);
  border: 3px solid var(--color-ink);
  border-radius: 30px;
  padding: 8px 16px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-hard-sm);
}

.hero-greeting {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  margin-bottom: 12px;
}

.hero-role {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-desc {
  max-width: 500px;
  font-size: 1.05rem;
  margin-bottom: 32px;
  opacity: 0.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* Khung avatar */
.hero-avatar-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

.avatar-frame {
  width: 280px;
  height: 280px;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--color-primary);
  box-shadow: var(--shadow-hard-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.avatar-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-ink);
}

.avatar-placeholder i {
  font-size: 3.5rem;
}

.avatar-sticker {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  border: 3px solid var(--color-ink);
  border-radius: 8px;
  padding: 8px 14px;
  box-shadow: var(--shadow-hard-sm);
  background: var(--color-white);
}

.avatar-sticker--1 {
  top: -10px;
  right: 10px;
  background: var(--color-secondary);
  transform: rotate(8deg);
}

.avatar-sticker--2 {
  bottom: 10px;
  left: -20px;
  background: var(--color-extra);
  transform: rotate(-6deg);
}

/* Hình trang trí nền hero */
.hero-shape {
  position: absolute;
  border: var(--border);
  z-index: 1;
}

.hero-shape--circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-secondary);
  top: 15%;
  right: 8%;
  opacity: 0.9;
  animation: floatShape 6s ease-in-out infinite;
}

.hero-shape--square {
  width: 70px;
  height: 70px;
  background: var(--color-accent);
  bottom: 12%;
  left: 4%;
  transform: rotate(15deg);
  animation: spinShape 9s linear infinite;
}

.hero-shape--triangle {
  width: 0;
  height: 0;
  border-left: 45px solid transparent;
  border-right: 45px solid transparent;
  border-bottom: 80px solid var(--color-extra);
  border-top: none;
  bottom: 20%;
  right: 20%;
  filter: drop-shadow(4px 4px 0 var(--color-ink));
  animation: bobShape 5s ease-in-out infinite;
}

/* Trôi nổi lên xuống nhẹ nhàng */
@keyframes floatShape {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-22px) rotate(10deg);
  }
}

/* Xoay tròn liên tục kết hợp lắc nhẹ theo trục Y */
@keyframes spinShape {
  0% {
    transform: rotate(15deg) translateY(0);
  }
  50% {
    transform: rotate(195deg) translateY(-10px);
  }
  100% {
    transform: rotate(375deg) translateY(0);
  }
}

/* Nhấp nhô kiểu "bồng bềnh" cho hình tam giác */
@keyframes bobShape {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(18px) rotate(-8deg);
  }
}

/* =========================================================
   GIỚI THIỆU
   ========================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.about-card {
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: 32px;
}

.about-card h3 {
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.about-card p + p {
  margin-top: 14px;
}

.about-card--accent {
  background: var(--color-primary);
}

.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  font-weight: 500;
}

.about-list i {
  color: var(--color-secondary);
  margin-top: 4px;
}

/* =========================================================
   KỸ NĂNG
   ========================================================= */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard-sm);
  padding: 24px;
  text-align: center;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hard);
}

.skill-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  color: var(--color-secondary);
}

.skill-card h3 {
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.skill-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 5px 12px;
  border: 2px solid var(--color-ink);
  border-radius: 20px;
}

.skill-tag--learning {
  background: var(--color-extra);
}

.skill-tag--basic {
  background: var(--color-accent);
}

.skill-tag--build {
  background: var(--color-primary);
}

/* =========================================================
   DỰ ÁN
   ========================================================= */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: 32px;
}

.project-card {
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
  min-width: 0; /* cho phép item grid co nhỏ lại thay vì tràn ra ngoài */
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translate(-4px, -4px);
  box-shadow: 12px 12px 0 var(--color-ink);
}

.project-thumb {
  height: 180px;
  background: var(--color-accent);
  border-bottom: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-thumb i {
  font-size: 3.5rem;
  color: var(--color-ink);
}

.project-body {
  padding: 24px;
  min-width: 0; /* cho phép nội dung con co lại thay vì đẩy tràn card */
}

.project-title,
.project-desc {
  overflow-wrap: break-word;
  word-break: break-word;
}

.project-title {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.project-desc {
  opacity: 0.85;
  margin-bottom: 16px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.project-tech li {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-bg);
  border: 2px solid var(--color-ink);
  border-radius: 6px;
  padding: 4px 10px;
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* =========================================================
   LIÊN HỆ
   ========================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 40px;
}

.contact-form {
  background: var(--color-white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border: var(--border);
  border-radius: 8px;
  background: var(--color-bg);
  resize: vertical;
  transition:
    box-shadow 0.15s ease,
    transform 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  box-shadow: 4px 4px 0 var(--color-accent);
  transform: translate(-2px, -2px);
}

.form-group input.input-error,
.form-group textarea.input-error {
  box-shadow: 4px 4px 0 var(--color-secondary);
  border-color: var(--color-secondary);
}

.form-error {
  display: block;
  min-height: 18px;
  color: var(--color-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 6px;
}

.form-success {
  margin-top: 16px;
  font-weight: 600;
  color: #1a7a4c;
  min-height: 20px;
}

.form-success.show {
  display: block;
}

.contact-social {
  background: var(--color-ink);
  color: var(--color-white);
  border: var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: 32px;
  height: fit-content;
}

.contact-social h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 600;
  background: var(--color-white);
  color: var(--color-ink);
  border: 3px solid var(--color-white);
  border-radius: 8px;
  padding: 12px 16px;
  transition:
    transform 0.15s ease,
    background 0.15s ease;
}

.social-link:hover {
  transform: translateX(6px);
  background: var(--color-primary);
}

.social-link i {
  font-size: 1.3rem;
}

/* =========================================================
   FOOTER
   ========================================================= */
.footer {
  background: var(--color-ink);
  color: var(--color-white);
  border-top: var(--border);
  padding: 32px 20px;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-tagline {
  opacity: 0.7;
  font-size: 0.9rem;
  margin-top: 4px;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-white);
  border-radius: 8px;
  font-size: 1.1rem;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.footer-social a:hover {
  background: var(--color-primary);
  color: var(--color-ink);
}

.back-to-top {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-ink);
  border: var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.15s ease;
}

.back-to-top:hover {
  transform: translateY(-4px);
}

/* =========================================================
   ANIMATION - fadeInUp khi cuộn tới (kết hợp IntersectionObserver)
   ========================================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-up {
  opacity: 0;
}

.fade-up.is-visible {
  animation: fadeInUp 0.7s ease forwards;
}

/* Tôn trọng người dùng bật chế độ giảm chuyển động */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .fade-up {
    opacity: 1;
  }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

/* Máy tính bảng */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

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

  .hero-avatar-wrap {
    order: -1;
    margin-bottom: 20px;
  }

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

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

/* Điện thoại / menu hamburger */
@media (max-width: 768px) {
  :root {
    --section-padding: 70px;
  }

  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-menu.is-open {
    max-height: 400px;
  }

  .nav-link {
    display: block;
    padding: 16px 24px;
    border-radius: 0;
    border-top: 2px solid var(--color-ink);
    text-align: center;
  }

  .nav-link--cta {
    box-shadow: none;
  }

  .hero-shape {
    display: none; /* tránh rối mắt trên màn hình nhỏ */
  }

  .avatar-frame {
    width: 220px;
    height: 220px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.2rem;
  }

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .project-actions .btn {
    width: 100%;
  }
}