/* ============================================================
   ABABACAR SAGNA — Portfolio CSS
   ============================================================ */

:root {
    --accent:  #0891b2;   /* cyan-600 — lisible sur blanc */
    --accent2: #7c3aed;   /* violet-600 — lisible sur blanc */
    --bg:      #ffffff;
    --bg2:     #f1f5f9;
    --card:    #ffffff;
    --border:  rgba(15,23,42,0.1);
    --text:    #1e293b;   /* slate-800 — bleu nuit */
    --muted:   #64748b;   /* slate-500 */
    --white:   #0f172a;   /* utilisé pour titres forts — bleu nuit foncé */
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
}

/* ===== NAV ===== */
nav {
    position: fixed; top:0; left:0; right:0; z-index:100;
    display: flex; align-items:center; justify-content:space-between;
    padding: 18px 5%;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 12px rgba(15,23,42,0.06);
}
.nav-logo {
    font-size:1.1rem; font-weight:700; letter-spacing:0.05em;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.nav-links { display:flex; gap:2rem; list-style:none; }
.nav-links a {
    color:var(--muted); text-decoration:none;
    font-size:0.875rem; letter-spacing:0.04em;
    transition: color 0.2s;
}
.nav-links a:hover { color:var(--white); }
.btn-nav { padding:10px 20px !important; font-size:0.8rem !important; }

/* ===== BUTTONS ===== */
.btn-primary {
    display:inline-flex; align-items:center; gap:8px;
    padding:14px 28px; border-radius:12px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    color:#ffffff; font-weight:700; font-size:0.875rem;
    text-decoration:none; transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(8,145,178,0.25);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 30px rgba(8,145,178,0.35); }

.btn-outline {
    display:inline-flex; align-items:center; gap:8px;
    padding:14px 28px; border-radius:12px;
    border:1px solid var(--border);
    background:rgba(15,23,42,0.04);
    color:var(--text); font-weight:600; font-size:0.875rem;
    text-decoration:none; transition:all 0.3s;
}
.btn-outline:hover { border-color:rgba(8,145,178,0.35); background:rgba(8,145,178,0.06); }

/* ===== HERO ===== */
#hero {
    min-height:100vh;
    display:grid; grid-template-columns:1fr 1fr;
    align-items:center; gap:60px;
    padding:100px 5% 60px;
    position:relative; overflow:hidden;
    background: linear-gradient(160deg, #ffffff 60%, #f0f9ff 100%);
}
/* Grid animée */
#hero::before {
    content:''; position:absolute; inset:0; z-index:0;
    background-image:
            linear-gradient(rgba(8,145,178,0.06) 1px, transparent 1px),
            linear-gradient(90deg, rgba(8,145,178,0.06) 1px, transparent 1px);
    background-size:60px 60px;
    animation: gridMove 20s linear infinite;
}
@keyframes gridMove {
    0%   { background-position: 0 0; }
    100% { background-position: 60px 60px; }
}
/* Orbes */
#hero::after {
    content:''; position:absolute; inset:0; z-index:0;
    background:
            radial-gradient(circle at 70% 50%, rgba(8,145,178,0.07) 0%, transparent 50%),
            radial-gradient(circle at 20% 80%, rgba(124,58,237,0.07) 0%, transparent 40%);
}

.hero-text { position:relative; z-index:1; }

.hero-badge {
    display:inline-flex; align-items:center; gap:8px;
    padding:6px 16px; border-radius:100px;
    background:rgba(8,145,178,0.08); border:1px solid rgba(8,145,178,0.2);
    font-size:0.75rem; letter-spacing:0.1em; text-transform:uppercase;
    color:var(--accent); margin-bottom:24px;
}
.hero-badge::before {
    content:''; width:7px; height:7px; border-radius:50%;
    background:var(--accent); box-shadow:0 0 8px var(--accent);
    animation: blink 2s infinite;
}
@keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0.3;} }

.hero-name {
    font-size:clamp(2.5rem,5vw,4rem);
    font-weight:800; line-height:1.1; letter-spacing:-0.02em;
    color:var(--white); margin-bottom:12px;
}
.hero-role {
    font-size:clamp(1.1rem,2.5vw,1.5rem);
    font-weight:500; margin-bottom:24px;
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.hero-desc {
    font-size:1rem; line-height:1.8; color:var(--muted);
    max-width:520px; margin-bottom:40px;
}
.hero-desc span { color:var(--text); font-weight:500; }

.hero-btns { display:flex; gap:16px; flex-wrap:wrap; margin-bottom:48px; }

.hero-stats { display:flex; gap:32px; }
.stat-item { text-align:center; }
.stat-num { font-size:1.8rem; font-weight:800; color:var(--white); line-height:1; }
.stat-num span {
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.stat-label { font-size:0.7rem; color:var(--muted); text-transform:uppercase; letter-spacing:0.08em; margin-top:4px; }

/* Photo */
.hero-visual { position:relative; z-index:1; display:flex; justify-content:center; }
.photo-wrapper { position:relative; width:360px; height:420px; }

.photo-border {
    position:absolute; inset:-3px; border-radius:28px;
    background:linear-gradient(135deg, var(--accent), var(--accent2), var(--accent));
    background-size:200% 200%;
    animation:borderAnim 4s linear infinite;
}
@keyframes borderAnim {
    0%  { background-position:0% 50%; }
    50% { background-position:100% 50%; }
    100%{ background-position:0% 50%; }
}
.photo-inner {
    position:absolute; inset:3px; border-radius:26px;
    overflow:hidden; background:var(--bg2); z-index:1;
}
.photo-inner img { width:100%; height:100%; object-fit:cover; object-position:center top; }
.photo-fallback {
    display:flex; align-items:center; justify-content:center;
    height:100%; font-size:4rem;
}
.photo-glow {
    position:absolute; bottom:-40px; left:50%; transform:translateX(-50%);
    width:200px; height:80px;
    background:radial-gradient(ellipse, rgba(8,145,178,0.2), transparent 70%);
}

/* Floating cards */
.float-card {
    position:absolute; z-index:2;
    background:rgba(255,255,255,0.97);
    backdrop-filter:blur(20px);
    border:1px solid var(--border);
    border-radius:14px; padding:12px 16px;
    font-size:0.75rem; white-space:nowrap;
    box-shadow:0 8px 32px rgba(15,23,42,0.12);
}
.float-card.card-top  { top:-20px; right:-40px; animation:float1 3s ease-in-out infinite; }
.float-card.card-bottom { bottom:20px; left:-40px; animation:float2 3.5s ease-in-out infinite; }
@keyframes float1 { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-8px);} }
@keyframes float2 { 0%,100%{transform:translateY(0);} 50%{transform:translateY(8px);} }
.float-card-icon  { font-size:1.2rem; margin-bottom:4px; }
.float-card-val   { font-size:1rem; font-weight:700; color:var(--white); }
.float-card-label { color:var(--muted); font-size:0.68rem; }

/* ===== SECTIONS COMMUNES ===== */
section { padding:100px 5%; }
.section-header { text-align:center; margin-bottom:64px; }
.section-tag {
    display:inline-block; padding:5px 16px; border-radius:100px;
    background:rgba(8,145,178,0.08); border:1px solid rgba(8,145,178,0.18);
    color:var(--accent); font-size:0.72rem; letter-spacing:0.12em; text-transform:uppercase;
    margin-bottom:16px;
}
.section-title {
    font-size:clamp(2rem,4vw,3rem); font-weight:800;
    color:var(--white); line-height:1.15; letter-spacing:-0.02em;
}
.section-title span {
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.section-sub { margin-top:16px; color:var(--muted); font-size:1rem; max-width:600px; margin-inline:auto; }

/* ===== SKILLS ===== */
#skills { background:var(--bg2); }
.skills-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(280px,1fr)); gap:24px; }
.skill-card {
    background:var(--card); border:1px solid var(--border);
    border-radius:20px; padding:28px;
    transition:all 0.3s; position:relative; overflow:hidden;
    box-shadow:0 2px 12px rgba(15,23,42,0.05);
}
.skill-card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:2px;
    background:linear-gradient(90deg, var(--accent), var(--accent2));
    transform:scaleX(0); transform-origin:left; transition:transform 0.3s;
}
.skill-card:hover { border-color:rgba(8,145,178,0.25); transform:translateY(-4px); box-shadow:0 8px 30px rgba(15,23,42,0.1); }
.skill-card:hover::before { transform:scaleX(1); }
.skill-card-icon  { font-size:2rem; margin-bottom:16px; }
.skill-card-title { font-size:1rem; font-weight:700; color:var(--white); margin-bottom:16px; }
.skill-tags { display:flex; flex-wrap:wrap; gap:8px; }
.skill-tag {
    padding:4px 12px; border-radius:100px;
    background:rgba(15,23,42,0.05); border:1px solid var(--border);
    font-size:0.72rem; color:var(--muted); transition:all 0.2s;
}
.skill-card:hover .skill-tag { border-color:rgba(8,145,178,0.2); color:var(--text); }

/* ===== PROJECTS ===== */
#projects { background:var(--bg); }
.projects-grid { display:grid; grid-template-columns:1fr 1fr; gap:28px; }

.project-card {
    background:var(--card); border:1px solid var(--border);
    border-radius:24px; padding:32px;
    transition:all 0.35s; position:relative; overflow:hidden;
    box-shadow:0 2px 12px rgba(15,23,42,0.05);
}
.project-card::before {
    content:''; position:absolute; inset:0;
    background:radial-gradient(circle at 80% 20%, rgba(8,145,178,0.04), transparent 60%);
    opacity:0; transition:opacity 0.3s;
    pointer-events: none;
}
.project-card:hover { border-color:rgba(8,145,178,0.3); transform:translateY(-5px); box-shadow:0 20px 50px rgba(15,23,42,0.1); }
.project-card:hover::before { opacity:1; }

.project-card.featured {
    grid-column:span 2;
    background:linear-gradient(135deg, rgba(8,145,178,0.04), rgba(124,58,237,0.04));
    border-color:rgba(8,145,178,0.2);
}

.project-top { display:flex; justify-content:space-between; align-items:flex-start; margin-bottom:20px; }
.project-emoji { font-size:2.4rem; }
.project-year {
    padding:4px 12px; border-radius:100px;
    background:rgba(15,23,42,0.05); border:1px solid var(--border);
    font-size:0.72rem; color:var(--muted); font-weight:600;
}
.impact-badge {
    display:inline-flex; align-items:center; gap:6px;
    padding:6px 14px; border-radius:100px; margin-bottom:16px;
    background:rgba(124,58,237,0.08); border:1px solid rgba(124,58,237,0.2);
    font-size:0.72rem; color:var(--accent2); font-weight:600;
}
.project-title {
    font-size:1.15rem; font-weight:700; color:var(--white);
    margin-bottom:12px; line-height:1.3;
}
.project-card.featured .project-title { font-size:1.45rem; }
.project-desc { font-size:0.875rem; line-height:1.75; color:var(--muted); margin-bottom:20px; }

.project-details {
    margin-bottom:20px;
    background:rgba(8,145,178,0.04);
    border:1px solid rgba(8,145,178,0.1);
    border-radius:12px; padding:16px;
}
.project-details-title {
    font-size:0.7rem; text-transform:uppercase; letter-spacing:0.1em;
    color:var(--accent); margin-bottom:10px; font-weight:600;
}
.project-details ul { list-style:none; display:flex; flex-direction:column; gap:6px; }
.project-details li { font-size:0.8rem; color:var(--muted); padding-left:16px; position:relative; }
.project-details li::before { content:'→'; position:absolute; left:0; color:var(--accent); font-size:0.7rem; }

.project-tech { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:24px; }
.tech-badge {
    padding:4px 12px; border-radius:100px;
    background:rgba(8,145,178,0.08); border:1px solid rgba(8,145,178,0.15);
    font-size:0.7rem; color:var(--accent); font-weight:500;
}

.project-links { display:flex; gap:12px; position:relative; z-index:2; }
.link-github, .link-demo {
    display:inline-flex; align-items:center; gap:6px;
    padding:10px 20px; border-radius:10px;
    font-size:0.8rem; font-weight:600; text-decoration:none; transition:all 0.2s;
    position:relative; z-index:2;
}
.link-github {
    background:rgba(15,23,42,0.05); border:1px solid var(--border); color:var(--text);
}
.link-github:hover { background:rgba(15,23,42,0.1); }
.link-demo {
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    color:#ffffff; box-shadow:0 4px 15px rgba(8,145,178,0.2);
}
.link-demo:hover { box-shadow:0 6px 25px rgba(8,145,178,0.35); transform:translateY(-1px); }

/* ===== WEB PROJECTS ===== */
#webprojects { background: var(--bg2); }

.projects-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}
@media (max-width: 600px) {
    .projects-detail-grid { grid-template-columns: 1fr; }
}

/* ===== EDUCATION ===== */
#education { background:var(--bg2); }
.edu-timeline { display:flex; flex-direction:column; gap:24px; max-width:800px; margin:0 auto; }
.edu-item { display:grid; grid-template-columns:140px 1fr; position:relative; }
.edu-item::before {
    content:''; position:absolute; left:136px; top:20px; bottom:-24px; width:2px;
    background:linear-gradient(180deg, var(--accent), transparent);
}
.edu-item:last-child::before { display:none; }
.edu-year { padding-top:16px; text-align:right; padding-right:32px; }
.edu-year-badge {
    display:inline-block; padding:4px 12px; border-radius:100px;
    background:rgba(8,145,178,0.08); border:1px solid rgba(8,145,178,0.18);
    font-size:0.72rem; color:var(--accent); font-weight:600;
}
.edu-dot {
    position:absolute; left:128px; top:20px;
    width:18px; height:18px; border-radius:50%;
    background:linear-gradient(135deg, var(--accent), var(--accent2));
    box-shadow:0 0 12px rgba(8,145,178,0.35); z-index:1;
}
.edu-content {
    background:var(--card); border:1px solid var(--border);
    border-radius:16px; padding:24px; margin-left:24px;
    transition:all 0.3s;
    box-shadow:0 2px 12px rgba(15,23,42,0.05);
}
.edu-content:hover { border-color:rgba(8,145,178,0.25); }
.edu-degree  { font-size:1rem; font-weight:700; color:var(--white); margin-bottom:6px; }
.edu-school  { font-size:0.875rem; color:var(--accent); margin-bottom:8px; }
.edu-desc    { font-size:0.8rem; color:var(--muted); line-height:1.6; }
.edu-mention {
    display:inline-block; margin-top:10px; padding:3px 10px; border-radius:100px;
    background:rgba(52,211,153,0.1); border:1px solid rgba(52,211,153,0.25);
    font-size:0.68rem; color:#059669; font-weight:600;
}
.edu-current {
    display:inline-block; margin-top:10px; padding:3px 10px; border-radius:100px;
    background:rgba(8,145,178,0.1); border:1px solid rgba(8,145,178,0.2);
    font-size:0.68rem; color:var(--accent); font-weight:600;
    animation:blink 2s infinite;
}

/* ===== CONTACT ===== */
#contact { background:var(--bg); text-align:center; }
.contact-grid { display:flex; gap:16px; justify-content:center; flex-wrap:wrap; margin-top:40px; }
.contact-card {
    display:flex; align-items:center; gap:12px;
    padding:16px 24px; border-radius:16px;
    background:var(--card); border:1px solid var(--border);
    text-decoration:none; color:var(--text); font-size:0.875rem;
    transition:all 0.3s;
    box-shadow:0 2px 12px rgba(15,23,42,0.05);
}
.contact-card:hover { border-color:rgba(8,145,178,0.3); transform:translateY(-3px); background:rgba(8,145,178,0.04); box-shadow:0 8px 25px rgba(15,23,42,0.08); }
.contact-icon  { font-size:1.3rem; }
.contact-label { font-weight:600; }
.contact-val   { font-size:0.75rem; color:var(--muted); }

/* ===== FOOTER ===== */
footer {
    padding:32px 5%;
    border-top:1px solid var(--border);
    display:flex; justify-content:space-between; align-items:center;
    font-size:0.8rem; color:var(--muted);
}
.footer-loc { color:var(--accent); }

/* ===== SCROLL REVEAL ===== */
.reveal {
    opacity:0;
    transform:translateY(30px);
    transition:opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity:1; transform:translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
    #hero { grid-template-columns:1fr; text-align:center; padding-top:120px; }
    .hero-visual { display:none; }
    .hero-desc { margin-inline:auto; }
    .hero-btns { justify-content:center; }
    .hero-stats { justify-content:center; }
    .projects-grid { grid-template-columns:1fr; }
    .project-card.featured { grid-column:span 1; }
    .edu-item { grid-template-columns:1fr; }
    .edu-year { text-align:left; padding:0 0 8px 0; }
    .edu-item::before, .edu-dot { display:none; }
    .edu-content { margin-left:0; }
}

@media (max-width: 600px) {
    .nav-links { display:none; }
    .skills-grid { grid-template-columns:1fr; }
    footer { flex-direction:column; gap:8px; text-align:center; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration:0.01ms !important;
        transition-duration:0.01ms !important;
    }
}