/* ====================================================
   RESET & CƠ BẢN (KHÔNG DÙNG CUSTOM CURSOR)
   ==================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: #020305;
    color: #a1a1aa;
    line-height: 1.7;
    font-weight: 300;
    position: relative;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 50% 0%, rgba(20,25,35,1) 0%, rgba(2,3,5,1) 70%);
}

/* ====================================================
   HIỆU ỨNG CHUYỂN TRANG
   ==================================================== */
.page-transition {
    animation: pageFadeIn 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    will-change: opacity, transform, filter;
}

@keyframes pageFadeIn {
    from { opacity: 0; filter: blur(8px); transform: translateY(15px); }
    to { opacity: 1; filter: blur(0); transform: translateY(0); }
}

/* ====================================================
   LỚP KÍNH CHUẨN APPLE LIQUID GLASS (KHÔI PHỤC SHIMMER)
   ==================================================== */
.glass-panel {
    background: rgba(20, 21, 26, 0.25);
    backdrop-filter: blur(20px) saturate(200%);
    -webkit-backdrop-filter: blur(20px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
    border-radius: 20px !important; /* Bo góc hệ thống */
}

/* Đường viền lóa sáng ở mép trên kính */
.glass-panel::before {
    content: ''; position: absolute;
    top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.3) 50%, transparent 100%);
    z-index: 10; pointer-events: none;
}

/* KHÔI PHỤC: Vệt sáng chéo lướt qua khi hover (Tối ưu bằng CSS Transform để không lag) */
.glass-panel::after {
    content: ''; position: absolute;
    top: 0; left: -150%; width: 50%; height: 100%;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.05), transparent);
    transform: skewX(-25deg);
    transition: transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 10; pointer-events: none;
}
.glass-panel:hover::after { transform: translateX(350%); }

/* ====================================================
   IPHONE MINIMAL SHAPES
   ==================================================== */
.shape {
    position: fixed; filter: blur(130px); z-index: -1; opacity: 0.25; 
    animation: liquidFloat 25s infinite alternate cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    will-change: transform;
}
.shape-1 { width: 45vw; height: 45vw; background: #1e3a8a; top: -10%; left: -10%; }
.shape-2 { width: 50vw; height: 50vw; background: #0f766e; bottom: -15%; right: -10%; animation-delay: -5s; }
.shape-3 { width: 35vw; height: 35vw; background: #475569; bottom: 20%; left: 20%; animation-delay: -10s; }

@keyframes liquidFloat {
    0% { transform: translate3d(0, 0, 0) scale(1); border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
    50% { transform: translate3d(4%, 2%, 0) scale(1.05); border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
    100% { transform: translate3d(-2%, -4%, 0) scale(0.95); border-radius: 50% 50% 30% 70% / 50% 60% 30% 60%; }
}

/* ====================================================
   THANH ĐIỀU HƯỚNG BẢN DESKTOP
   ==================================================== */
.navbar {
    position: fixed; top: 0; width: 100%;
    display: flex; justify-content: space-between; align-items: center;
    padding: 30px 60px; z-index: 1000; background: transparent;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled {
    background: rgba(2, 3, 5, 0.65); 
    backdrop-filter: blur(25px) saturate(150%);
    -webkit-backdrop-filter: blur(25px) saturate(150%);
    padding: 15px 60px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-logo { font-size: 1.5rem; font-weight: 600; color: #ffffff; letter-spacing: 3px; }
.nav-links { list-style: none; display: flex; gap: 15px; position: relative; }
.nav-indicator {
    position: absolute; background: rgba(255, 255, 255, 0.08); 
    border-radius: 50px; transition: all 0.35s cubic-bezier(0.25, 1, 0.3, 1);
    opacity: 0; transform: scale(0.7); pointer-events: none; z-index: 0;
}
.nav-links li { position: relative; z-index: 1; }
.nav-links a {
    display: inline-block; color: #a1a1aa; text-decoration: none;
    font-weight: 400; font-size: 0.95rem; padding: 10px 24px; transition: color 0.3s ease;
}
.nav-links li:hover a { color: #ffffff; }

/* ====================================================
   HERO SECTION (KHÔI PHỤC LIQUID RING)
   ==================================================== */
.hero {
    min-height: 100vh; display: flex; justify-content: center; align-items: center;
    text-align: center; padding-top: 150px; padding-bottom: 80px; position: relative; z-index: 10;
}

.hero-avatar { width: 150px; height: 150px; margin: 0 auto 40px; position: relative; display: flex; justify-content: center; align-items: center; }
.hero-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; position: relative; z-index: 2; border: 2px solid rgba(255,255,255,0.05); }

/* KHÔI PHỤC: Liquid Ring Avatar xoay nhịp nhàng */
.liquid-ring {
    position: absolute; top: -10px; left: -10px; right: -10px; bottom: -10px;
    background: linear-gradient(135deg, #38bdf8, #1e3a8a);
    z-index: 1; opacity: 0.5; filter: blur(10px);
    animation: spinLiquid 10s linear infinite;
    border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
}
@keyframes spinLiquid {
    0% { transform: rotate(0deg); border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
    50% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
    100% { transform: rotate(360deg); border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; }
}

.greeting { font-size: 0.8rem; letter-spacing: 6px; color: #38bdf8; margin-bottom: 20px; font-weight: 500;}
.hero h1 { font-size: 5rem; font-weight: 600; color: #ffffff; margin-bottom: 20px; letter-spacing: -2px; }
.tagline { font-size: 1.05rem; color: #a1a1aa; margin-bottom: 50px; letter-spacing: 1px; }
.tagline .accent-dot { color: #38bdf8; margin: 0 10px; opacity: 0.5; }

.personal-info-card { border-radius: 20px; padding: 40px; max-width: 600px; margin: 0 auto 50px; text-align: left; }
.personal-info-card li { margin-bottom: 18px; font-size: 1rem; color: #d4d4d8; list-style: none;}
.personal-info-card li strong { color: #ffffff; font-weight: 500; display: inline-block; width: 130px;}
.personal-info-card i { color: #38bdf8; margin-right: 15px; width: 20px; opacity: 0.8;}

.hero-buttons { display: flex; justify-content: center; gap: 20px; }
.btn-primary, .btn-secondary {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 16px 36px; text-decoration: none; font-weight: 500; border-radius: 50px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn-primary { background: #ffffff; color: #020305; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 15px 30px rgba(255,255,255,0.15); }
.btn-secondary { color: #ffffff; }
.btn-secondary:hover { transform: translateY(-3px); border-color: rgba(56, 189, 248, 0.5); }
.btn-secondary i { transition: transform 0.4s; }
.btn-secondary:hover i { transform: translateX(5px); }

/* ====================================================
   TIMELINE (KHÔI PHỤC GLOW PULSE)
   ==================================================== */
.timeline { max-width: 800px; margin: 0 auto; border-left: 1px solid rgba(255, 255, 255, 0.1); padding-left: 50px; }
.timeline-item { margin-bottom: 60px; position: relative; transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1); cursor: pointer; }
.timeline-item:hover { transform: translateX(8px); }

/* Chấm Glow động mạch đập mượt trên Timeline */
.timeline-item::before {
    content: ''; position: absolute; left: -56px; top: 8px; width: 12px; height: 12px;
    background: #ffffff; border-radius: 50%; animation: pulseDot 2.5s infinite;
}
@keyframes pulseDot {
    0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    70% { box-shadow: 0 0 0 12px rgba(255, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

.timeline-item h3 { color: #ffffff; font-size: 1.4rem; font-weight: 500; margin-bottom: 10px; transition: color 0.3s; }
.timeline-item:hover h3 { color: #38bdf8; }
.timeline-item .date { display: block; color: #71717a; font-size: 0.85rem; letter-spacing: 2px; margin-bottom: 15px; text-transform: uppercase; }

/* ====================================================
   THÀNH TỰU (ASYMMETRICAL GRID)
   ==================================================== */
.achievements-grid {
    display: grid; grid-template-columns: 1.5fr 1fr; gap: 30px; max-width: 1100px; margin: 0 auto;
}
.achievement-card {
    border-radius: 24px; padding: 40px; display: flex; flex-direction: column; justify-content: space-between;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1); cursor: pointer;
}
.achievement-card:hover { transform: translateY(-6px); border-color: rgba(56, 189, 248, 0.3); box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4); }
.ach-large { grid-row: span 2; }
.ach-large .ach-icon { font-size: 4rem; margin-bottom: 40px; color: #ffffff; }
.ach-large h3 { font-size: 2.5rem; letter-spacing: -1px; margin-bottom: 15px; color: #ffffff; }
.ach-large p { font-size: 1.1rem; color: #38bdf8; margin-bottom: 20px;}
.ach-small { height: 220px; }
.ach-small .ach-icon { font-size: 2rem; margin-bottom: 20px; color: #ffffff; opacity: 0.8; }
.ach-small h3 { font-size: 1.4rem; color: #ffffff; margin-bottom: 5px; }

/* ====================================================
   SCROLL ANIMATIONS (MƯỢT & STAGGER TRÊN GPU)
   ==================================================== */
.scroll-animate {
    opacity: 0; filter: blur(6px); transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                filter 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    transition-delay: var(--delay, 0s); 
    will-change: opacity, transform, filter;
}
.scroll-animate.show { opacity: 1; filter: blur(0); transform: translateY(0); }

.section { padding: 150px 10%; position: relative; z-index: 10; }
.section-title { font-size: 3rem; color: #ffffff; margin-bottom: 60px; text-align: center; font-weight: 500; letter-spacing: -1px; }
.bg-darker { background: linear-gradient(180deg, rgba(10,11,15,0) 0%, rgba(10,11,15,0.4) 50%, rgba(10,11,15,0) 100%); }

.contact-container { text-align: center; max-width: 650px; margin: 0 auto; }
.contact-links { display: flex; justify-content: center; gap: 20px; margin-top: 50px; }
.social-btn {
    padding: 18px 36px; color: #ffffff; text-decoration: none; border-radius: 50px;
    font-weight: 400; display: flex; align-items: center; gap: 12px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.social-btn:hover { transform: translateY(-4px); color: #38bdf8; border-color: rgba(56, 189, 248, 0.4); }

footer { text-align: center; padding: 60px; color: #52525b; font-size: 0.85rem; letter-spacing: 1px; position: relative; z-index: 10; }

/* ====================================================
   GIAO DIỆN ĐIỆN THOẠI (MOBILE RESPONSIVE)
   ==================================================== */
@media (max-width: 900px) {
    .shape { display: none !important; } /* Tắt nền chất lỏng mờ trên Mobile để tăng hiệu năng tối đa */
    .navbar { padding: 15px 0; flex-direction: column; align-items: flex-start; gap: 15px; width: 100vw; overflow: hidden; }
    .navbar.scrolled { padding: 10px 0; }
    .nav-logo { padding: 0 5%; }
    .nav-links { width: 100%; display: flex; flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; justify-content: flex-start; padding: 0 5% 5px 5%; gap: 12px; }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links { -ms-overflow-style: none; scrollbar-width: none; }
    .nav-links li { flex-shrink: 0; }
    .nav-links a { display: block; white-space: nowrap; padding: 10px 22px; font-size: 0.9rem; background: rgba(255, 255, 255, 0.08); border-radius: 50px; border: 1px solid rgba(255, 255, 255, 0.05); }
    .nav-indicator { display: none !important; }

    .hero { padding-top: 130px; padding-bottom: 50px; }
    .hero h1 { font-size: 3.2rem; }
    .tagline span { display: block; margin-bottom: 5px; }
    .tagline .accent-dot { display: none; }
    
    .personal-info-card { width: 100%; margin: 0 auto 40px; padding: 25px 20px; box-sizing: border-box; }
    .personal-info-card li { font-size: 0.9rem; margin-bottom: 12px; word-wrap: break-word; }
    .personal-info-card li strong { display: inline-block; width: auto; min-width: 90px; color: #38bdf8; margin-right: 5px; }
    .personal-info-card i { display: none; }
    
    .hero-buttons { flex-direction: column; width: 100%; padding: 0 5%; gap: 15px; }
    .btn-primary, .btn-secondary { width: 100%; justify-content: center; font-size: 0.95rem; }

    .section { padding: 80px 5%; }
    .section-title { font-size: 2.2rem; margin-bottom: 40px; }
    .timeline { padding-left: 20px; }
    .timeline-item::before { left: -26.5px; width: 10px; height: 10px; }
    .timeline-item h3 { font-size: 1.2rem; }
    .achievements-grid { grid-template-columns: 1fr; gap: 20px;}
    .ach-large { grid-row: auto; padding: 30px; }
    .ach-large .ach-icon { font-size: 3rem; margin-bottom: 20px; }
    .ach-large h3 { font-size: 2rem; }
    .ach-small { height: auto; padding: 25px; }
    .contact-links { flex-direction: column; gap: 15px; }
    .social-btn { width: 100%; justify-content: center; }
}