/* 
  Các class tái sử dụng (utilities):
  - Container canh giữa nội dung
  - Button styling
  - Text, card, dark mode toggle...
*/

/* ==================== CONTAINER CHUNG ==================== */
.container {
  max-width: var(--width-medium);
  margin: 0 auto;
  padding: 1rem 2rem;
}

/* Hiệu ứng khi bôi chọn (select) tiêu đề */
h1::selection,
h2::selection {
  color: #111;
  background: var(--primary-color);
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.9rem;
  border-radius: 30px;
  text-transform: uppercase;
  font-size: 0.82rem;
  transition: 0.3s;
  cursor: pointer;
}

.btn-primary {
  background: var(--primary-color);
  color: #000000;
}

.btn-secondary {
  margin: 5px 0;
  background-color: var(--bg-secondary);
  color: var(--bg-primary);
}

/* Hover cho button chính (ví dụ: nút tải CV) */
.btn-primary:hover {
  background: var(--secondary-color);
}

/* ==================== DARK MODE TOGGLE ==================== */
#switch {
  display: none;
}

.toggle-icons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.toggle-icons > img {
  transition: 0.6s cubic-bezier(0.23, 1, 0.32, 1);
  width: 30px;
}

.moon {
  transform: rotate(10deg);
}

#switch:checked + .toggle-icons .moon {
  transform: rotate(250deg);
}

#switch:checked + .toggle-icons .sun {
  transform: rotate(100deg);
}

/* ==================== HEADER / HERO CONTAINER ==================== */
.header-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 8rem;
  padding: 2rem 1rem;
  min-height: calc(100vh - 8rem);
}

.header-container > div {
  margin-top: 0;
}

.header-container h1 {
  font-size: 4rem;
  font-weight: var(--weight-bold);
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

/* Text mô tả trong hero và các section */
.content-text {
  text-align: left;
  margin: 0;
  width: 100%;
}

.content-text h2 {
  font-size: 2.25rem;
  line-height: 1.3;
  transition: 0.2s ease-in-out;
  font-weight: var(--weight-semibold);
  margin: 0.75rem 0 1rem 0;
  color: var(--text-color);
}

.content-text p {
  padding: 0;
  margin: 0.75rem 0;
  max-width: 100%;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-color);
}

.content-text strong {
  font-weight: var(--weight-bold);
  color: var(--text-color);
}

/* ==================== PROJECT CARDS ==================== */
.card {
  padding: 1rem;
  background: var(--card-background);
  color: #ffffff;
  border-radius: 5px;
  transition: 0.4s ease-in-out;
  cursor: pointer;
}

.card a {
  color: #ffffff;
  transition: 0.25s ease-in-out;
  font-size: 1.1rem;
  margin-right: 0.3rem;
}

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

.card:hover {
  box-shadow: inset 0 100px 1000px 10px rgba(0, 0, 0, 0.8);
}

.card:hover .project-info {
  opacity: 1;
}

/* ==================== ẢNH BACKGROUND CHO TỪNG PROJECT ==================== */

/* project 1 */
.card:nth-child(1) {
  background: url(../assets/project/project-one.png) center center/cover;
}

/* Project 2 */
.card:nth-child(2) {
  background: url(../assets/project/project-two.png) center center/cover;
}

/* Project 3 */
.card:nth-child(3) {
  background: url(../assets/project/project-three.png) center center/cover;
}

/* Project 4 */
.card:nth-child(4) {
  background: url(../assets/project/project-four.png) center center/cover;
}

/* Project 5 */
.card:nth-child(5) {
  background: url(../assets/project/project-five.png) center center/cover;
}

/* Project 6 */
.card:nth-child(6) {
  background: url(../assets/project/project-six.png) center center/cover;
}

/* ==================== MEDIA QUERIES ==================== */
@media (max-width: 768px) {
  .header-container {
    margin-top: 7rem;
    text-align: center;
    padding: 1.5rem 1rem;
    min-height: auto;
  }

  .header-container h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
  }

  .content-text {
    text-align: center;
  }

  .content-text h2 {
    font-size: 1.5rem;
    margin: 0.5rem 0 0.75rem 0;
  }

  .content-text p {
    font-size: 0.9rem;
    margin: 0.5rem 0;
  }
}