/* =============================================
   TUẤN TRẦN — Personal Landing Page
   Style: White / Lean / Clean Minimal
   ============================================= */

/* ---------- Reset & Variables ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #ffffff;
    --bg-subtle: #fafafa;
    --bg-hover: #f5f5f5;
    --border: #e8e8e8;
    --border-light: #f0f0f0;
    --text: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent: #000000;
    --accent-soft: #444444;
    --award-bg: #fffbeb;
    --award-border: #fde68a;
    --award-text: #92400e;
    --founder-bg: #f0fdf4;
    --founder-border: #bbf7d0;
    --founder-text: #166534;
    --role-bg: #f5f5f5;
    --role-text: #555555;
    --tag-bg: #f5f5f5;
    --tag-text: #666666;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'SF Mono', monospace;
    --max-w: 680px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }

::selection {
    background: var(--text);
    color: var(--bg);
}

/* ---------- Container ---------- */
.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Navigation ---------- */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
}

.nav-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-logo {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.3px;
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-link {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s var(--ease);
}

.nav-link:hover { color: var(--text); }

.nav-hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-hamburger span {
    display: block;
    width: 18px; height: 1.5px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.25s var(--ease);
}

.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(2.5px, 2.5px); }
.nav-hamburger.active span:nth-child(2) { transform: rotate(-45deg) translate(0px, 0px); }

.mobile-menu {
    display: none;
    position: fixed;
    top: 56px; left: 0; right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    padding: 16px 24px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px);
    opacity: 0;
    transition: all 0.3s var(--ease);
}

.mobile-menu.active { transform: translateY(0); opacity: 1; }

.mobile-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 12px 0;
    transition: color 0.2s var(--ease);
}

.mobile-link:hover { color: var(--text); }

/* ---------- Hero ---------- */
.hero {
    padding: 120px 24px 60px;
    max-width: var(--max-w);
    margin: 0 auto;
}

.hero-left {
    display: flex;
    gap: 28px;
    align-items: flex-start;
}

.avatar-container { flex-shrink: 0; }

.avatar-img {
    width: 88px; height: 88px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border);
}

.hero-info { flex: 1; }

.hero-name {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1.2;
    margin-bottom: 4px;
}

.hero-role {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 400;
}

.hero-bio {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 16px;
}

.hero-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.meta-item {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.hero-actions {
    display: flex;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    border: none;
    border-radius: 8px;
    font-size: 0.82rem;
}

.btn-primary {
    padding: 10px 20px;
    background: var(--text);
    color: var(--bg);
}

.btn-primary:hover {
    background: var(--accent-soft);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.btn-ghost {
    padding: 10px 20px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    color: var(--text);
    background: var(--bg-hover);
    transform: translateY(-1px);
}

/* ---------- Divider ---------- */
.divider {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
    height: 1px;
}

.divider::after {
    content: '';
    display: block;
    height: 1px;
    background: var(--border);
}

/* ---------- Section ---------- */
.section {
    padding: 48px 0 60px;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 32px;
    letter-spacing: -0.3px;
}

/* ---------- Projects ---------- */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.project {
    padding: 28px 0;
    border-bottom: 1px solid var(--border-light);
    transition: background 0.2s var(--ease);
}

.project:first-child {
    border-top: 1px solid var(--border-light);
}

.project-awarded {
    padding: 28px 0;
}

.project-awards-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.project-awards-row .project-award {
    margin-bottom: 0;
}

.project-award {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--award-text);
    background: var(--award-bg);
    border: 1px solid var(--award-border);
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 100px;
    margin-bottom: 14px;
    letter-spacing: 0.2px;
}

.project-award-neutral {
    background: var(--bg-hover);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.project-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.project-name {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    color: var(--text);
}

.project-parent {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-muted);
}

.project-role {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--role-text);
    padding: 3px 10px;
    background: var(--role-bg);
    border-radius: 100px;
    white-space: nowrap;
}

.role-founder {
    color: var(--founder-text);
    background: var(--founder-bg);
    border: 1px solid var(--founder-border);
}

.project-date {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--mono);
    font-weight: 400;
    white-space: nowrap;
    padding-top: 3px;
}

.project-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    padding: 3px 10px;
    font-size: 0.7rem;
    font-weight: 500;
    background: var(--tag-bg);
    border-radius: 100px;
    color: var(--tag-text);
    letter-spacing: 0.2px;
}

/* ---------- Building Status ---------- */
.project-building {
    border: 1px solid #d1fae5;
    border-radius: 12px;
    padding: 24px;
    background: #f0fdf8;
}

.building-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #059669;
    margin-bottom: 14px;
    letter-spacing: 0.3px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #10b981;
    animation: pulse-green 2s ease-in-out infinite;
}

@keyframes pulse-green {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
}

.project-link {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s var(--ease);
    white-space: nowrap;
    padding-top: 3px;
}

.project-link:hover { color: var(--text); }

/* ---------- Footer ---------- */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-light);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-text {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.footer-link {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s var(--ease);
}

.footer-link:hover { color: var(--text); }

/* ---------- Animations ---------- */
[data-animate] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
    .nav-links { display: none; }
    .nav-hamburger { display: flex; }
    .mobile-menu.active { display: flex; }

    .hero { padding: 100px 24px 40px; }

    .hero-left {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

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

    .avatar-img { width: 72px; height: 72px; }

    .hero-name { font-size: 1.35rem; }

    .project-header { flex-direction: column; gap: 6px; }
    .project-title-row { flex-wrap: wrap; }

    .hero-actions { flex-direction: column; align-items: stretch; }
    .btn { justify-content: center; }

    .footer-content {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}