/* ============================================
   Ahmad Sunansyah — Portfolio
   Modern · Glassmorphism · Animated
   Dark Theme + Light Theme
   ============================================ */

/* === CSS Variables === */
:root {
    --bg: #08080f;
    --bg-alt: #0e0e1a;
    --card: #121220;
    --card-hover: #181828;
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    --text: #e4e4f0;
    --text-secondary: #a0a0c0;
    --text-muted: #686890;
    --accent: #8b5cf6;
    --accent2: #3b82f6;
    --accent-glow: rgba(139,92,246,0.25);
    --gradient: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 50%, #06b6d4 100%);
    --gradient-warm: linear-gradient(135deg, #ec4899, #f59e0b);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 60px rgba(139,92,246,0.08);
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --display: 'Space Grotesk', 'Inter', sans-serif;
    --max-w: 1150px;
}

/* === Light Theme === */
html[data-theme="light"] {
    --bg: #f4f5f9;
    --bg-alt: #eef0f5;
    --card: #ffffff;
    --card-hover: #f8f9fd;
    --border: rgba(0,0,0,0.06);
    --border-hover: rgba(0,0,0,0.12);
    --text: #1a1a2e;
    --text-secondary: #5a5a7a;
    --text-muted: #9090aa;
    --accent: #7c3aed;
    --accent2: #2563eb;
    --accent-glow: rgba(124,58,237,0.12);
    --shadow: 0 8px 32px rgba(0,0,0,0.08);
    --shadow-glow: 0 0 60px rgba(124,58,237,0.06);
}

/* === Reset === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
    font-family:var(--font);
    background:var(--bg);
    color:var(--text);
    line-height:1.7;
    overflow-x:hidden;
    transition:background var(--transition),color var(--transition);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

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

/* === Navigation === */
.nav{
    position:fixed;top:0;left:0;right:0;z-index:1000;
    padding:16px 0;
    background:rgba(8,8,15,0.75);
    backdrop-filter:blur(20px) saturate(180%);
    -webkit-backdrop-filter:blur(20px) saturate(180%);
    border-bottom:1px solid var(--border);
    transition:all var(--transition);
}
html[data-theme="light"] .nav{background:rgba(244,245,249,0.8)}
.nav-inner{
    max-width:var(--max-w);margin:0 auto;padding:0 24px;
    display:flex;align-items:center;
}
.logo{
    font-family:var(--display);font-weight:700;font-size:1.4rem;
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;
    letter-spacing:-0.5px;
}
.nav-links{display:flex;gap:8px}
.nav-links a{
    padding:8px 16px;border-radius:var(--radius-sm);
    font-size:0.9rem;font-weight:500;color:var(--text-secondary);
    transition:all var(--transition);
}
.nav-links a:hover,.nav-links a.active{color:var(--accent);background:var(--accent-glow)}

/* === Theme Toggle === */
.theme-switch{position:relative;display:inline-block;width:56px;height:30px;cursor:pointer;margin:0 4px}
.theme-switch input{opacity:0;width:0;height:0}
.theme-slider{
    position:absolute;inset:0;border-radius:30px;
    background:#2a2a40;border:1px solid var(--border);
    display:flex;align-items:center;justify-content:space-between;
    padding:0 8px;font-size:12px;transition:all var(--transition);
}
html[data-theme="light"] .theme-slider{background:#e0e0ea}
.theme-slider .fa-sun{color:#f59e0b;z-index:1}
.theme-slider .fa-moon{color:#8b8cf6;z-index:1}
.theme-knob{
    position:absolute;top:3px;left:3px;
    width:22px;height:22px;border-radius:50%;
    background:var(--accent);
    transition:transform var(--transition);
}
html[data-theme="light"] .theme-knob{transform:translateX(26px)}

.lang-toggle{
    padding:6px 12px;border-radius:20px;font-size:0.8rem;font-weight:600;
    background:var(--accent-glow);color:var(--accent);
    border:1px solid var(--accent);transition:all var(--transition);
}
.lang-toggle:hover{opacity:0.85}

.hamburger{display:none;flex-direction:column;gap:5px;width:28px;padding:4px;z-index:1001}
.hamburger span{display:block;height:2px;background:var(--text);border-radius:2px;transition:all var(--transition)}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* === Sections === */
.section{padding:100px 0;position:relative}
.section.alt{background:var(--bg-alt)}
.section-title{
    font-family:var(--display);font-size:2.4rem;font-weight:700;
    margin-bottom:48px;text-align:center;letter-spacing:-1px;
}
.section-title .accent{
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;
}

/* === Hero === */
.hero{
    min-height:100vh;display:flex;align-items:center;justify-content:center;
    padding:120px 24px 80px;
    position:relative;overflow:hidden;
}
.hero::before{
    content:'';position:absolute;top:20%;left:10%;
    width:500px;height:500px;border-radius:50%;
    background:radial-gradient(circle,rgba(139,92,246,0.08),transparent 70%);
    pointer-events:none;
}
.hero::after{
    content:'';position:absolute;bottom:10%;right:5%;
    width:400px;height:400px;border-radius:50%;
    background:radial-gradient(circle,rgba(59,130,246,0.08),transparent 70%);
    pointer-events:none;
}
.hero-inner{
    display:flex;align-items:center;gap:60px;
    max-width:var(--max-w);width:100%;z-index:1;
}
.hero-photo{flex-shrink:0}
.photo-frame{
    width:220px;height:220px;border-radius:50%;
    padding:4px;
    background:var(--gradient);
    position:relative;
}
.photo-frame::after{
    content:'';position:absolute;inset:4px;
    border-radius:50%;background:var(--bg);
}
.profile-photo{
    width:100%;height:100%;object-fit:cover;border-radius:50%;
    position:relative;z-index:1;
}
.photo-placeholder{
    position:absolute;inset:4px;z-index:1;
    border-radius:50%;background:var(--bg);
    display:flex;align-items:center;justify-content:center;
    font-family:var(--display);font-size:2.5rem;font-weight:700;
    color:var(--accent);
}
.hero-text{flex:1}
.hero-hello{
    font-size:1.1rem;font-weight:500;color:var(--accent);
    margin-bottom:8px;letter-spacing:1px;text-transform:uppercase;
}
.hero-text h1{
    font-family:var(--display);font-size:3.5rem;font-weight:800;
    line-height:1.1;margin-bottom:12px;letter-spacing:-1.5px;
}
.hero-text h1 .accent{
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;
}
.hero-tagline{
    font-size:1.3rem;color:var(--text-secondary);
    font-weight:500;margin-bottom:16px;
}
.hero-desc{
    font-size:1rem;color:var(--text-muted);
    max-width:500px;margin-bottom:28px;line-height:1.8;
}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}

/* === Buttons === */
.btn{
    display:inline-flex;align-items:center;gap:8px;
    padding:12px 28px;border-radius:var(--radius-sm);
    font-size:0.95rem;font-weight:600;
    transition:all var(--transition);
    letter-spacing:-0.2px;
}
.btn-primary{
    background:var(--gradient);color:#fff;
    box-shadow:0 4px 20px var(--accent-glow);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(139,92,246,0.35)}
.btn-outline{
    border:2px solid var(--border);color:var(--text);
    background:transparent;
}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}

/* === About Grid === */
.about-grid{
    display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.about-card{
    background:var(--card);border:1px solid var(--border);
    border-radius:var(--radius);padding:32px 24px;
    text-align:center;transition:all var(--transition);
    position:relative;overflow:hidden;
}
.about-card::before{
    content:'';position:absolute;top:0;left:0;right:0;
    height:3px;background:var(--gradient);
    opacity:0;transition:opacity var(--transition);
}
.about-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.about-card:hover::before{opacity:1}
.about-card i{
    font-size:2rem;margin-bottom:16px;
    background:var(--gradient);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;
    background-clip:text;
}
.about-card h3{font-family:var(--display);font-weight:600;font-size:1.05rem;margin-bottom:8px}
.about-card p{font-size:0.9rem;color:var(--text-muted);line-height:1.6}

/* === Skills === */
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.skill-group{
    background:var(--card);border:1px solid var(--border);
    border-radius:var(--radius);padding:28px 24px;
}
.skill-group h4{
    font-family:var(--display);font-size:1.1rem;font-weight:600;
    margin-bottom:20px;display:flex;align-items:center;gap:10px;
    color:var(--accent);
}
.skill-group h4 i{font-size:1rem}
.skill-row{margin-bottom:16px}
.skill-row span{display:block;font-size:0.9rem;margin-bottom:6px;color:var(--text-secondary)}
.skill-bar{
    height:8px;border-radius:4px;background:var(--bg-alt);overflow:hidden;
}
.skill-bar .fill{
    height:100%;border-radius:4px;
    background:var(--gradient);
    width:0;transition:width 1.2s cubic-bezier(0.4,0,0.2,1);
}

/* === Projects === */
.projects-grid{
    display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.project-card{
    background:var(--card);border:1px solid var(--border);
    border-radius:var(--radius);overflow:hidden;
    transition:all var(--transition);
}
.project-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.project-thumb{height:200px;overflow:hidden;background:var(--bg-alt)}
.project-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.5s}
.project-card:hover .project-thumb img{transform:scale(1.08)}
.project-icon{
    height:200px;display:flex;align-items:center;justify-content:center;
    font-size:3rem;color:var(--accent);background:var(--bg-alt);
}
.project-card h3{font-family:var(--display);font-weight:600;font-size:1.05rem;padding:20px 20px 8px}
.project-card p{font-size:0.9rem;color:var(--text-muted);padding:0 20px 16px;line-height:1.6}
.tags{display:flex;flex-wrap:wrap;gap:6px;padding:0 20px 16px}
.tags span{
    padding:4px 10px;border-radius:20px;
    font-size:0.75rem;font-weight:500;
    background:var(--accent-glow);color:var(--accent);
}
.project-link-btn{
    display:inline-flex;align-items:center;gap:6px;
    padding:0 20px 20px;font-size:0.9rem;font-weight:600;
    color:var(--accent);transition:all var(--transition);
}
.project-link-btn:hover{gap:10px}

/* === Contact === */
.contact-grid{
    display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;
}
.contact-info{display:flex;flex-direction:column;gap:24px}
.info-item{
    display:flex;align-items:center;gap:14px;padding:20px 24px;
    background:var(--card);border:1px solid var(--border);
    border-radius:var(--radius);font-size:0.95rem;
    transition:all var(--transition);
}
.info-item:hover{border-color:var(--accent)}
.info-item i{
    font-size:1.2rem;width:40px;height:40px;
    display:flex;align-items:center;justify-content:center;
    border-radius:var(--radius-sm);
    background:var(--accent-glow);color:var(--accent);
}
.socials{display:flex;gap:12px;padding-left:10px}
.socials a{
    width:44px;height:44px;border-radius:50%;
    display:flex;align-items:center;justify-content:center;
    border:1px solid var(--border);font-size:1.1rem;
    transition:all var(--transition);color:var(--text-secondary);
}
.socials a:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}

.contact-form{
    background:var(--card);border:1px solid var(--border);
    border-radius:var(--radius);padding:32px;
    display:flex;flex-direction:column;gap:16px;
}
.contact-form input,.contact-form textarea{
    width:100%;padding:14px 18px;border-radius:var(--radius-sm);
    border:1px solid var(--border);background:var(--bg-alt);
    color:var(--text);font-family:var(--font);font-size:0.95rem;
    transition:all var(--transition);outline:none;
}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.contact-form textarea{resize:vertical;min-height:120px}
.contact-form .btn{width:fit-content}
.form-msg{font-size:0.9rem;min-height:24px}
.form-msg.success{color:#10b981}
.form-msg.error{color:#ef4444}

/* === Footer === */
.footer{
    text-align:center;padding:32px 24px;
    border-top:1px solid var(--border);color:var(--text-muted);
    font-size:0.9rem;
}

/* === Animations === */
@keyframes fadeInUp{
    from{opacity:0;transform:translateY(30px)}
    to{opacity:1;transform:translateY(0)}
}
.about-card,.skill-group,.project-card,.info-item{
    animation:fadeInUp 0.6s ease backwards;
}
.about-card:nth-child(2){animation-delay:0.1s}
.about-card:nth-child(3){animation-delay:0.2s}
.about-card:nth-child(4){animation-delay:0.3s}
.skill-group:nth-child(2){animation-delay:0.1s}
.skill-group:nth-child(3){animation-delay:0.2s}
.project-card:nth-child(2){animation-delay:0.1s}
.project-card:nth-child(3){animation-delay:0.2s}

/* === Responsive === */
@media (max-width:1024px){
    .about-grid{grid-template-columns:repeat(2,1fr)}
    .skills-grid{grid-template-columns:repeat(2,1fr)}
    .projects-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
    .nav-links{
        position:fixed;top:0;right:-100%;width:280px;height:100vh;
        flex-direction:column;padding:80px 24px 24px;
        background:var(--card);border-left:1px solid var(--border);
        transition:right var(--transition);z-index:999;gap:4px;
    }
    .nav-links.active{right:0}
    .nav-links a{font-size:1rem;padding:12px 16px}
    .hamburger{display:flex}
    .hero-inner{flex-direction:column;text-align:center;gap:32px}
    .hero-text h1{font-size:2.5rem}
    .hero-desc{margin:0 auto 28px}
    .hero-btns{justify-content:center}
    .about-grid{grid-template-columns:1fr}
    .skills-grid{grid-template-columns:1fr}
    .projects-grid{grid-template-columns:1fr}
    .contact-grid{grid-template-columns:1fr}
    .section{padding:60px 0}
    .section-title{font-size:1.8rem;margin-bottom:32px}
}
@media (max-width:480px){
    .hero{padding:100px 16px 60px}
    .hero-text h1{font-size:2rem}
    .container{padding:0 16px}
}