:root {
    --navy: #0f172a;
    --navy-light: #1e293b;
    --gold: #fbbf24;
    --gold-grad: linear-gradient(135deg, #b48811, #fbbf24, #fcd34d);
    --bg: #f8fafc;
    --white: #ffffff;
    --text: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

/* --- HEADER --- */
.main-header {
    position: relative;
    width: 100%;
    height: 300px;
    background: radial-gradient(circle at center, #334155, #0f172a);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding: 20px;
}

#blockchain-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.header-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
}

.header-content {
    position: relative;
    z-index: 2;
}

.header-content h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 800;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.subtitle {
    color: var(--gold);
    font-weight: 500;
}

/* --- FLUID LAYOUT --- */
.container-fluid {
    width: 100%;
    padding: 0 20px 40px 20px;
    margin-top: -60px;
    position: relative;
    z-index: 10;
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
    align-items: start;
}

/* --- SIDEBAR --- */
.sidebar-wrapper {
    position: sticky;
    top: 20px;
    height: auto;
}

.profile-card {
    background: var(--white);
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    text-align: center;
    padding-bottom: 30px;
    border-top: 5px solid var(--gold);
}

.avatar-area {
    width: 200px;
    height: 200px;
    margin: 30px auto 20px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.avatar-ring {
    position: absolute;
    inset: -5px;
    border-radius: 50%;
    background: conic-gradient(transparent, var(--gold), transparent 40%);
    animation: spin 3s linear infinite;
}

.avatar-img {
    width: 190px;
    height: 190px;
    border-radius: 50%;
    border: 4px solid var(--white);
    position: relative;
    z-index: 2;
    object-fit: cover;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}

/* Sidebar Info */
.lang-control {
    margin-bottom: 15px;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.5;
    margin: 0 5px;
    transition: 0.2s;
}

.lang-btn:hover,
.lang-btn.active {
    opacity: 1;
    transform: scale(1.1);
}

.name {
    color: var(--navy);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.role {
    color: #64748b;
    font-weight: 600;
    font-size: 0.9rem;
}

.org {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 20px;
}

.action-btn {
    display: inline-block;
    background: var(--gold-grad);
    color: var(--navy);
    padding: 12px 35px;
    border-radius: 50px;
    font-weight: 700;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(251, 191, 36, 0.3);
}

.action-btn:hover {
    transform: translateY(-2px);
}

/* Contact & Zalo */
.contact-list a {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.contact-list i {
    color: var(--navy);
    margin-right: 8px;
    width: 20px;
}

.contact-list a:hover {
    color: var(--gold);
}

/* Zalo Custom Style */
.zalo-link {
    font-weight: 600;
    color: #0068ff !important;
}

.zalo-icon {
    background: #0068ff;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 800;
    margin-right: 8px;
    font-family: sans-serif;
    box-shadow: 0 2px 5px rgba(0, 104, 255, 0.3);
}

.zalo-link:hover .zalo-icon {
    background: var(--navy);
}

/* --- RIGHT CONTENT --- */
.content-wrapper {
    width: 100%;
    min-width: 0;
}

.card-box {
    background: var(--white);
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    background: linear-gradient(to right, var(--navy), #334155);
    padding: 15px 25px;
    display: flex;
    align-items: center;
    color: var(--white);
}

.card-header i {
    color: var(--gold);
    margin-right: 15px;
    font-size: 1.2rem;
}

.card-header h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
}

.card-body {
    padding: 25px;
}

.mb-10 {
    margin-bottom: 10px;
}

.mb-15 {
    margin-bottom: 15px;
}

.mt-10 {
    margin-top: 10px;
}

.mt-20 {
    margin-top: 20px;
}

/* Lists & Stats */
.list-check li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.list-check li::before {
    content: "✔";
    color: var(--gold);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.sub-list {
    margin-top: 5px;
    margin-left: 10px;
    border-left: 2px solid #e2e8f0;
    padding-left: 15px;
    margin-bottom: 15px;
}

.sub-list li {
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.sub-list-dot {
    list-style: disc;
    margin-left: 20px;
    color: #475569;
    margin-top: 5px;
}

.timeline .t-item {
    border-left: 3px solid var(--gold);
    padding-left: 15px;
    margin-bottom: 20px;
}

.t-item h4 {
    color: var(--navy);
    margin-bottom: 5px;
    font-weight: 700;
}

.t-item ul {
    margin-top: 5px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.stat {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
}

.stat span {
    display: block;
    font-size: 2rem;
    color: var(--navy);
    font-weight: 800;
}

.award-list li,
.honor-list li {
    margin-bottom: 12px;
    display: flex;
}

.award-list i,
.honor-list i {
    margin-right: 10px;
    margin-top: 5px;
    color: var(--gold);
    flex-shrink: 0;
}

.sub-head {
    color: var(--navy);
    font-weight: 700;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 5px;
    margin-bottom: 15px;
}

.grid-books {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
}

.book {
    background: #fffbeb;
    border: 1px solid var(--gold);
    color: #92400e;
    padding: 15px;
    border-radius: 6px;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
}

/* Slider */
.slider-box {
    padding: 20px 0;
    overflow: hidden;
}

.slider-track {
    display: flex;
    width: max-content;
    animation: scroll 20s linear infinite;
}

.slide {
    width: 220px;
    padding: 0 10px;
}

.slide img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 8px;
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(calc(-220px * 5));
    }
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    background: var(--navy);
    color: #94a3b8;
    margin-top: 40px;
}

footer a {
    color: var(--gold);
}

/* --- SECTION UNIVERSAL STYLING (Upgrade) --- */
.section-universal {
    background: var(--white);
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    overflow: hidden;
    padding-bottom: 25px;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-universal h2 {
    background: linear-gradient(to right, var(--navy), #334155);
    padding: 15px 25px;
    display: flex;
    align-items: center;
    color: var(--white);
    margin: 0 0 20px 0;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
}

/* Base Icon Style */
.section-universal h2::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    margin-right: 15px;
    color: var(--gold);
    font-size: 1.2rem;
    display: inline-block;
}

/* Specific Icons per Section */
[data-section="education"] h2::before {
    content: "\f19d";
}

/* Graduation Cap */
[data-section="experience"] h2::before {
    content: "\f0b1";
}

/* Briefcase */
[data-section="skills"] h2::before {
    content: "\f5fd";
}

/* Layer Group */
[data-section="projects"] h2::before {
    content: "\f0e8";
}

/* Diagram Project */
[data-section="awards"] h2::before {
    content: "\f091";
}

/* Trophy */
[data-section="services"] h2::before {
    content: "\f2b5";
}

/* Handshake */
[data-section="products"] h2::before {
    content: "\f49e";
}

/* Box Open */
[data-section="testimonials"] h2::before {
    content: "\f086";
}

/* Comments */
[data-section="hobbies"] h2::before {
    content: "\f004";
}

/* Heart */
[data-section="contact_note"] h2::before {
    content: "\f0e0";
}

/* Envelope */
[data-section="youtube_video"] h2::before,
[data-section="video"] h2::before {
    content: "\f03d";
}

/* Video */

/* Content Spacing */
.section-universal>*:not(h2) {
    margin-left: 25px;
    margin-right: 25px;
    display: block;
}

/* Clean up internal spacing for timelines if needed */
.section-universal .timeline {
    margin-top: 0;
}

@media screen and (max-width: 992px) {
    .container-fluid {
        grid-template-columns: 1fr;
        padding: 0 15px;
    }

    .sidebar-wrapper {
        position: relative;
        top: 0;
        margin-bottom: 20px;
    }

    .main-header {
        height: auto;
        padding: 60px 20px 80px;
    }
}