/* Import các tệp khác */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');
@import url('_variables.css');
@import url('_animations.css');

/* Cấu hình chung & Reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: #f0f0f0;
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    transition: background-color var(--transition-fast) ease, opacity 0.4s ease;
    display: flex; /* Sử dụng Flexbox để điều khiển bố cục trang */
    flex-direction: column; /* Xếp các phần tử theo chiều dọc */
    min-height: 100vh; /* Đảm bảo body chiếm ít nhất 100% chiều cao màn hình */
    opacity: 0; /* Bắt đầu ẩn để tạo hiệu ứng fade-in */
}
body.is-loaded {
    opacity: 1; /* Hiển thị trang khi đã sẵn sàng */
}
body.is-leaving {
    opacity: 0; /* Ẩn trang khi chuyển đi */
}
body[data-theme="dark"] {
    background-color: #000;
}

/* Nền Aurora động */
.aurora-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    filter: blur(100px);
    opacity: 0.8;
    transition: opacity var(--transition-smooth) ease;
}
body[data-theme="dark"] .aurora-background {
    opacity: 0.5;
}
.blob {
    position: absolute;
    border-radius: 50%;
    opacity: 0.6;
}
.blob1 {
    width: 40vmax;
    height: 40vmax;
    top: -10vh;
    left: -15vw;
    background: radial-gradient(circle, #ff9a9e 0%, #fad0c4 90%);
    animation: moveBlob1 30s infinite alternate ease-in-out;
}
.blob2 {
    width: 50vmax;
    height: 50vmax;
    bottom: -20vh;
    right: -25vw;
    background: radial-gradient(circle, #a1c4fd 0%, #c2e9fb 100%);
    animation: moveBlob2 35s infinite alternate ease-in-out;
}
.blob3 {
    width: 35vmax;
    height: 35vmax;
    top: 20vh;
    right: -20vw;
    background: radial-gradient(circle, #84fab0 0%, #8fd3f4 100%);
    animation: moveBlob3 25s infinite alternate ease-in-out;
}

/* Header */
.main-header { position: fixed; width: 100%; z-index: 1000; background: var(--glass-background); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur); border-bottom: 1px solid var(--color-border); transition: all var(--transition-fast) ease; }
.navbar { display: flex; justify-content: space-between; align-items: center; max-width: var(--content-width); margin: 0 auto; padding: 1rem 2rem; }
.logo { font-size: 1.25rem; font-weight: 700; color: var(--color-text-primary); text-decoration: none; }
.logo:hover {
    transform: scale(1.05);
}
.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
}
.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
    padding-bottom: 5px;
    transition: color var(--transition-fast) ease;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text-primary);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-fast) var(--ease-out-quart);
}
.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}
.nav-extra {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--color-text-primary);
    position: relative;
    width: 30px;
    height: 30px;
    transition: transform var(--transition-fast) ease;
}
#theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
}
#theme-toggle .sun-icon,
#theme-toggle .moon-icon {
    position: absolute;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
#theme-toggle .sun-icon {
    opacity: 0;
    transform: translateY(10px);
}
#theme-toggle .moon-icon {
    opacity: 1;
    transform: translateY(0);
}
body[data-theme="dark"] #theme-toggle .sun-icon {
    opacity: 1;
    transform: translateY(0);
}
body[data-theme="dark"] #theme-toggle .moon-icon {
    opacity: 0;
    transform: translateY(-10px);
}

/* Header khi cuộn trang */
.main-header.scrolled {
    padding: 0.5rem 2rem;
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(30px);
}

.main-header.scrolled .logo {
    font-size: 1.1rem;
}

.main-header.scrolled .nav-links a {
    font-size: 0.85rem;
}

/* Layout Nội dung Chính */
.content {
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 8rem 2rem 5rem 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.section-title { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; text-align: center; margin-bottom: 4rem; }

/* Trang Giới thiệu (Canh giữa nội dung) */
#page-home .content,
#page-contact .content {
    justify-content: center;
}
.about-me {
    text-align: center;
    width: 100%;
}
.intro-text h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}
.intro-text p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
    color: var(--color-text-secondary);
}
.memoji-container {
    width: clamp(120px, 15vw, 150px);
    height: auto;
    margin: 0 auto;
}
.memoji {
    width: 100%;
    animation: subtle-float 3s infinite ease-in-out;
}

/* Trang Về mình (About) */
.about-section {
    max-width: 900px;
    margin: 0 auto 5rem auto;
}
.about-header { display: flex; align-items: center; gap: 3rem; }

.profile-picture { width: 180px; height: 180px; border-radius: 50%; object-fit: cover; flex-shrink: 0; box-shadow: var(--shadow-medium); }
.about-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 2rem;
}
.about-subtitle { word-wrap: break-word; overflow-wrap: break-word; }

.skills-section {
    max-width: 1000px;
    margin: 0 auto;
}
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.skill-card {
    background: var(--glass-background);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-large);
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all var(--transition-fast) var(--ease-out-quart);
}
.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}
.skill-card i {
    font-size: 2.5rem;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}
.skill-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}
.skill-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* Trang Liên hệ */
.contact-container {
    text-align: center;
    width: 100%;
}
.contact-social-icons {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-bottom: 2rem;
}
.contact-social-icons .social-icon {
    font-size: 2.5rem;
    color: var(--color-text-primary);
    transition: transform var(--transition-fast) ease, color var(--transition-fast) ease;
}
.contact-social-icons .social-icon:hover {
    color: var(--color-accent);
    transform: scale(1.1);
}
.contact-info {
    font-size: 1rem;
    color: var(--color-text-secondary);
}
.contact-info a {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
}
.contact-info a:hover {
    text-decoration: underline;
    color: var(--color-accent);
}

.video-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.video-item {
    text-decoration: none;
    color: var(--color-text-primary);
    background: var(--glass-background);
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-subtle);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: all var(--transition-fast) var(--ease-out-quart);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}
.video-item:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: var(--shadow-medium);
}
.video-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}
.video-info {
    padding: 1.5rem;
}
.video-info h3 {
    margin: 0 0 0.25rem 0;
    font-size: 1.1rem;
    font-weight: 700;
}
.video-info p {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: text-decoration var(--transition-fast) ease;
}
.back-link:hover {
    text-decoration: underline;
}
.video-player {
    width: 100%;
    margin-bottom: 3rem;
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-medium);
    background: #000;
}
.video-responsive {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
}
.video-responsive iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.video-detail-info {
    max-width: 800px;
    margin: 0 auto 4rem auto;
    text-align: center;
}
.behind-the-scenes {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}
.photo-grid img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius-medium);
    cursor: pointer;
    transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.photo-grid img:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-medium);
}

/* Lightbox Modal */
.lightbox-modal {
    display: none; /* Mặc định ẩn */
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden; /* Ngăn cuộn trang bên dưới */
    background-color: rgba(0, 0, 0, 0.9);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.4s ease;
    cursor: zoom-in; /* Con trỏ mặc định là phóng to */
}
.lightbox-modal.active {
    display: flex;
    opacity: 1;
}
.lightbox-modal.is-zoomed {
    cursor: zoom-out; /* Thay đổi con trỏ khi đã phóng to */
}
.lightbox-content {
    display: block;
    max-width: 90%;
    max-height: 85%;
    transform: scale(0.8); /* Bắt đầu với tỷ lệ nhỏ hơn để có hiệu ứng zoom-in */
    transition: transform 0.4s var(--ease-out-quart);
    will-change: transform;
}
.lightbox-modal.active .lightbox-content {
    transform: scale(1); /* Phóng to ảnh khi modal mở */
}
.lightbox-content.zoomed {
    transform: scale(1.5); /* Tỷ lệ phóng to khi nhấp đúp */
}
.close-button {
    position: absolute;
    top: 25px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    text-shadow: 0 0 5px rgba(0,0,0,0.5);
    transition: 0.3s;
    cursor: pointer;
    z-index: 2001;
    border: none;
    background: none;
    line-height: 1;
}
.close-button:hover,
.close-button:focus {
    color: #bbb;
}
.prev-button,
.next-button {
    cursor: pointer;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: auto;
    padding: 16px;
    color: white;
    font-weight: bold;
    font-size: 20px;
    transition: 0.3s;
    user-select: none;
    background-color: rgba(0, 0, 0, 0.4);
    border: none;
    z-index: 2001;
}
.prev-button {
    left: 10px;
    border-radius: 0 3px 3px 0;
}
.next-button {
    right: 10px;
    border-radius: 3px 0 0 3px;
}
.prev-button:hover,
.next-button:hover {
    background-color: rgba(0, 0, 0, 0.8);
}
.lightbox-loading-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 4px;
    background-color: var(--color-accent);
    transition: width 0.3s ease-in-out;
}

/* Footer */
.main-footer {
    background: var(--glass-background);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: all var(--transition-fast) ease;
    color: var(--color-text-secondary);
    width: 100%;
    padding: 0.5rem 0;
}
.footer-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 2rem;
}
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-social {
    display: flex;
    gap: 1rem;
}
.footer-social a { color: var(--color-text-secondary); font-size: 1.2rem; transition: color var(--transition-fast) ease; }
.footer-social a:hover { color: var(--color-accent); }
.footer-bottom p {
    margin: 0;
    font-size: 0.7rem;
}

/* --- Tối ưu hóa cho di động --- */
@media (max-width: 768px) {
    body { min-height: 100dvh; }
    .content {
        padding-top: 8rem;
        padding-left: calc(1.5rem + env(safe-area-inset-left));
        padding-right: calc(1.5rem + env(safe-area-inset-right));
    }

    .navbar { flex-direction: column; gap: 0.75rem; padding: 0.75rem 1rem; }
    .logo { font-size: 1.1rem; }
    .nav-right-group { width: 100%; display: flex; justify-content: space-around; align-items: center; border-top: 1px solid var(--color-border); padding-top: 0.75rem; gap: 1rem; }
    .nav-links { gap: 0; justify-content: space-around; flex-grow: 1; }
    .nav-links a { padding: 0.5rem; font-size: 0.85rem; }

    .section-title { font-size: 1.8rem; margin-bottom: 2.5rem; }
    
    .about-header {
        display: flex;
        flex-direction: column;
        align-items: center; /* Căn giữa tất cả item con theo chiều ngang */
        gap: 1.5rem;
    }
    .about-header div { /* <--- SỬA LẠI SELECTOR NÀY */
        text-align: center; /* Căn giữa chữ */
    }

    .main-header {
        /* Ban đầu: Trong suốt và không có hiệu ứng */
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        border-bottom-color: transparent;
        box-shadow: none;
    }

    .main-header.scrolled .navbar {
        padding: 0.55rem 0rem !important; /* Giữ nguyên padding */
    }

    .navbar {
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.75rem 1rem !important; 
    
    /* Vô hiệu hóa animation padding trên mobile */
    transition: none !important;
    }

    .nav-right-group {
        width: 100%;
        display: flex;
        justify-content: space-around;
        align-items: center;
        border-top: 1px solid var(--color-border);
        padding-top: 0.75rem;
        gap: 1rem;
    }

    .nav-links {
        gap: 0;
        justify-content: space-around;
        flex-grow: 1;
    }

    .nav-links a {
        padding: 0.5rem;
        font-size: 0.85rem;
    }

    .profile-picture { width: 120px; height: 120px; }
    .about-title { font-size: clamp(1.8rem, 7vw, 2.2rem); margin-bottom: 0.5rem; }
    .about-subtitle { font-size: 1rem; white-space: normal !important; word-wrap: break-word; overflow-wrap: break-word; }

    .skills-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
    .skill-card { padding: 1.5rem; }
    .skill-card i { font-size: 2rem; margin-bottom: 1rem; }
    .skill-card h3 { font-size: 1rem; }
    .skill-card p { font-size: 0.85rem; }

    .video-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 1.2rem; padding-bottom: calc(1rem + env(safe-area-inset-bottom)); }
    .footer-social a { padding: 0.5rem; font-size: 1.4rem; }
}