:root {
    --brand: #2563eb;
    --brand-dark: #1e3a8a;
    --accent: #f59e0b;
    --ink: #0f172a;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Poppins', system-ui, sans-serif;
    color: var(--ink);
}

/* ---------- Navbar ---------- */
.navbar .nav-link {
    position: relative;
    transition: color 0.2s;
}
.navbar .nav-link::after {
    content: '';
    position: absolute;
    left: 0.5rem;
    right: 0.5rem;
    bottom: 2px;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform 0.25s;
}
.navbar .nav-link:hover::after,
.navbar .nav-link.active::after {
    transform: scaleX(1);
}

/* ---------- Footer ---------- */
.footer-link {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    display: inline-block;
    padding: 0.15rem 0;
    transition: color 0.2s, transform 0.2s;
}
.footer-link:hover {
    color: #fff;
    transform: translateX(4px);
}
.back-to-top {
    position: fixed;
    right: 1.25rem;
    bottom: 1.25rem;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.25);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s, transform 0.3s;
    z-index: 1030;
}
.back-to-top.show {
    opacity: 1;
    pointer-events: auto;
}
.back-to-top:hover {
    color: #fff;
    transform: translateY(-4px);
}

/* ---------- Hero ---------- */
.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #2563eb 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
}
.hero::before { width: 420px; height: 420px; top: -140px; right: -100px; }
.hero::after  { width: 260px; height: 260px; bottom: -110px; left: -60px; }
.hero .container { position: relative; z-index: 1; }

.page-hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    color: #fff;
}

.profile-photo {
    width: 240px;
    height: 240px;
    object-fit: cover;
    object-position: center;
    border: 6px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.35);
    animation: floaty 5s ease-in-out infinite;
}

/* ---------- Animations ---------- */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: none; }
}
@keyframes floaty {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-10px); }
}
.fade-up         { animation: fadeUp 0.8s ease both; }
.fade-up.delay-1 { animation-delay: 0.15s; }
.fade-up.delay-2 { animation-delay: 0.3s; }
.fade-up.delay-3 { animation-delay: 0.45s; }

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
    opacity: 1;
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .fade-up, .profile-photo { animation: none; }
    .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Cards and hover effects ---------- */
.hover-lift {
    transition: transform 0.25s, box-shadow 0.25s;
}
.hover-lift:hover {
    transform: translateY(-8px);
    box-shadow: 0 1rem 2rem rgba(15, 23, 42, 0.18) !important;
}
.icon-circle {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(37, 99, 235, 0.12);
    color: var(--brand);
    transition: background 0.25s, color 0.25s, transform 0.25s;
}
.hover-lift:hover .icon-circle {
    background: var(--brand);
    color: #fff;
    transform: rotate(-8deg) scale(1.08);
}
.section-title {
    position: relative;
    display: inline-block;
    padding-bottom: 0.6rem;
    font-weight: 700;
}
.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 60px;
    height: 4px;
    border-radius: 2px;
    background: var(--accent);
    transform: translateX(-50%);
}
.section-title.text-start::after {
    left: 0;
    transform: none;
}
.stat-number {
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--brand);
}

/* ---------- Timeline (resume) ---------- */
.timeline {
    position: relative;
    padding-left: 2rem;
    border-left: 3px solid rgba(37, 99, 235, 0.25);
}
.timeline-item {
    position: relative;
    margin-bottom: 1.75rem;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 9px);
    top: 1.4rem;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--brand);
    border: 3px solid #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
    transition: transform 0.25s, background 0.25s;
}
.timeline-item:hover::before {
    transform: scale(1.35);
    background: var(--accent);
}

/* ---------- Portfolio ---------- */
.project-img,
.project-placeholder {
    height: 200px;
    width: 100%;
}
.project-img {
    object-fit: cover;
    object-position: top;
    transition: transform 0.4s;
}
.project-card .img-wrap {
    overflow: hidden;
}
.project-card:hover .project-img {
    transform: scale(1.08);
}
.project-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.85);
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
}
/* ---------- Category colors: Programming = blue, Data analysis = yellow, Databases = dark green ---------- */
.badge-databases {
    background-color: #14532d;
    color: #fff;
}

.filter-btn {
    color: var(--c);
    border: 1px solid var(--c);
    background: transparent;
    transition: background 0.2s, color 0.2s, transform 0.2s;
}
.filter-btn:hover,
.filter-btn.active {
    background: var(--c);
    border-color: var(--c);
    color: #fff;
}
.filter-btn:hover {
    transform: translateY(-2px);
}
.filter-btn[data-filter="all"]         { --c: #0f172a; }
.filter-btn[data-filter="programming"] { --c: #2563eb; }
.filter-btn[data-filter="data"]        { --c: #f59e0b; }
.filter-btn[data-filter="databases"]   { --c: #14532d; }
.filter-btn[data-filter="data"]:hover,
.filter-btn[data-filter="data"].active {
    color: #000;
}

/* Colored top line on each card */
.cat-programming { border-top: 4px solid #2563eb !important; }
.cat-data        { border-top: 4px solid #f59e0b !important; }
.cat-databases   { border-top: 4px solid #14532d !important; }

/* Placeholder background when a project has no image */
.ph-programming { background: linear-gradient(135deg, #1e3a8a, #2563eb); }
.ph-data        { background: linear-gradient(135deg, #b45309, #f59e0b); }
.ph-databases   { background: linear-gradient(135deg, #052e16, #14532d); }

/* ---------- Gallery ---------- */
.passion-card {
    text-decoration: none;
    color: inherit;
}
.passion-card:hover {
    color: inherit;
}
.chip-nav {
    position: sticky;
    top: 56px;
    z-index: 1010;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid #e2e8f0;
}
.chip {
    display: inline-block;
    padding: 0.35rem 0.9rem;
    margin: 0.25rem 0.15rem;
    border-radius: 999px;
    border: 1px solid #cbd5e1;
    font-size: 0.9rem;
    text-decoration: none;
    color: var(--ink);
    transition: background 0.2s, color 0.2s, transform 0.2s;
}
.chip:hover {
    background: var(--brand);
    border-color: var(--brand);
    color: #fff;
    transform: translateY(-2px);
}
.photo-frame {
    position: relative;
    overflow: hidden;
    border-radius: 0.75rem;
    aspect-ratio: 4 / 3;
    box-shadow: 0 0.5rem 1rem rgba(15, 23, 42, 0.15);
    background: #e2e8f0;
}
.photo-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: zoom-in;
    transition: transform 0.5s;
}
.photo-frame:hover img {
    transform: scale(1.1);
}
.photo-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #64748b;
    border: 2px dashed #94a3b8;
    border-radius: 0.75rem;
    font-size: 0.85rem;
    text-align: center;
    padding: 0.5rem;
}
.photo-placeholder i {
    font-size: 2rem;
}