/* --- AESTHETIC LIGHT THEME VARIABLES --- */
:root {
    --bg-main: #f8fafc;        
    --bg-card: #ffffff;        
    --accent-primary: #6366f1;
    --accent-secondary: #ec4899;
    --accent-glow: rgba(99, 102, 241, 0.2);
    --text-main: #0f172a;      
    --text-muted: #475569;     
    --text-code: #8b5cf6;      
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-soft: 0 10px 30px -5px rgba(0, 0, 0, 0.05);
    --trans-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
}

#bg-canvas {
    position: fixed;
    top: 0; 
    left: 0; 
    width: 100vw; 
    height: 100vh;
    z-index: -1; 
    pointer-events: none;
}

h1, h2, h3, h4, h5, h6 { 
    font-weight: 700; 
    color: var(--text-main); 
}

code {
    font-family: 'Fira Code', monospace;
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-code);
}

/* --- NAVBAR --- */
.navbar-custom {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--trans-smooth);
}

.navbar-brand { 
    font-weight: 800; 
    color: var(--text-main) !important; 
}

.brand-accent { 
    color: var(--accent-primary); 
}

.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    margin: 0 5px;
    transition: var(--trans-smooth);
    position: relative;
}

.nav-link:hover, 
.nav-link.active { 
    color: var(--accent-primary) !important; 
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0; 
    height: 2px;
    bottom: 0; 
    left: 50%;
    background-color: var(--accent-primary);
    transition: var(--trans-smooth);
    transform: translateX(-50%);
}

.nav-link:hover::after, 
.nav-link.active::after { 
    width: 100%; 
}

/* --- HERO SECTION --- */
.hero-section {
    min-height: 100vh;
    display: flex; 
    align-items: center;
    padding-top: 80px;
    background: linear-gradient(rgba(248, 250, 252, 0.85), rgba(248, 250, 252, 0.95)), url('https://images.unsplash.com/photo-1500382017468-7049fae79e95?auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
}

.hero-badge {
    display: inline-block; 
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px; 
    font-size: 0.85rem; 
    font-weight: 600;
    margin-bottom: 24px; 
    text-transform: uppercase;
}

.hero-title { 
    font-size: clamp(2.5rem, 6vw, 4.5rem); 
    font-weight: 800; 
    line-height: 1.1; 
    margin-bottom: 24px; 
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent; 
    background-clip: text;
}

.hero-subtitle { 
    font-size: clamp(1.1rem, 2vw, 1.2rem); 
    color: var(--text-muted); 
    max-width: 600px; 
    margin-bottom: 40px; 
}

.btn-custom {
    padding: 14px 32px; 
    border-radius: 8px; 
    font-weight: 600;
    transition: var(--trans-smooth); 
    text-decoration: none; 
    display: inline-flex; 
    align-items: center; 
    gap: 10px;
}

.btn-primary-custom {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff; 
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary-custom:hover { 
    transform: translateY(-3px); 
    box-shadow: 0 8px 25px var(--accent-glow); 
    color: #fff; 
}

.btn-pdf { 
    background: #ffffff; 
    color: var(--text-main); 
    border: 1px solid var(--border-color); 
    box-shadow: var(--shadow-soft); 
}

.btn-pdf:hover { 
    background: #f1f5f9; 
    color: var(--accent-primary); 
    border-color: var(--accent-primary); 
}

/* --- SECTIONS --- */
.content-section { 
    padding: 100px 0; 
    border-top: 1px solid var(--border-color); 
    position: relative; 
    z-index: 1; 
}

.section-number { 
    font-family: 'Fira Code', monospace; 
    color: var(--accent-primary); 
    font-size: 1.2rem; 
    font-weight: 600; 
    display: block; 
    margin-bottom: 10px; 
}

.explanation-box { 
    background: var(--bg-card); 
    border: 1px solid var(--border-color); 
    border-radius: 16px; 
    padding: 32px; 
    height: 100%; 
    display: flex; 
    flex-direction: column; 
    box-shadow: var(--shadow-soft); 
}

.evidence-box { 
    background: var(--bg-card); 
    border: 1px solid var(--border-color); 
    border-radius: 16px; 
    padding: 32px; 
    height: 100%; 
    position: relative; 
    overflow: hidden; 
    box-shadow: var(--shadow-soft); 
}

/* --- HTML FORM --- */
.form-control-custom {
    background: #f8fafc; 
    border: 1px solid #e2e8f0; 
    color: var(--text-main); 
    border-radius: 8px; 
    padding: 12px 16px;
}

.form-control-custom:focus { 
    background: #ffffff; 
    border-color: var(--accent-primary); 
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2); 
    color: var(--text-main); 
}

.form-label-custom { 
    font-size: 0.9rem; 
    font-weight: 600; 
    color: var(--text-main); 
    margin-bottom: 8px; 
}

/* --- CSS CARDS --- */
.css-card-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
    gap: 20px; 
}

.css-skill-card {
    background: #ffffff; 
    border: 1px solid #e2e8f0; 
    border-radius: 8px; 
    padding: 24px; 
    text-align: center; 
    transition: all 0.4s; 
    cursor: pointer; 
    position: relative; 
    overflow: hidden; 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.css-skill-card::before {
    content: ''; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background: radial-gradient(circle at center, rgba(99, 102, 241, 0.05) 0%, transparent 70%); 
    opacity: 0; 
    transition: opacity 0.4s; 
    z-index: 0;
}

.css-skill-card:hover { 
    transform: translateY(-8px); 
    border-color: var(--accent-primary); 
    box-shadow: 0 15px 30px -5px rgba(99, 102, 241, 0.15); 
}

.css-skill-card:hover::before { 
    opacity: 1; 
}

.css-skill-icon { 
    font-size: 2.5rem; 
    color: var(--accent-primary); 
    margin-bottom: 16px; 
    position: relative; 
    z-index: 1; 
    transition: transform 0.4s; 
}

.css-skill-card:hover .css-skill-icon { 
    transform: scale(1.1) rotate(5deg); 
}

.css-skill-title { 
    font-weight: 700; 
    position: relative; 
    z-index: 1; 
    color: var(--text-main); 
}

/* BOOTSTRAP BOXES*/
.bs-stat-box { 
    background: #f8fafc; 
    border: 1px solid #e2e8f0; 
    border-radius: 8px; 
    padding: 20px; 
    border-left: 4px solid var(--accent-secondary); 
    transition: transform 0.3s; 
}

.bs-stat-box:hover { 
    transform: translateY(-3px); 
    box-shadow: var(--shadow-soft); 
}

.bs-stat-value { 
    font-size: 2rem; 
    font-weight: 800; 
    font-family: 'Fira Code', monospace; 
    margin: 0; 
    color: var(--text-main); 
}

/* --- JS BOX --- */
.js-calc-result { 
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(236, 72, 153, 0.05)); 
    border: 1px dashed var(--accent-primary); 
    border-radius: 8px; 
    padding: 30px; 
    text-align: center; 
}

/* --- ANIMATIONS --- */
.fade-in-up { 
    opacity: 0; 
    transform: translateY(30px); 
    transition: opacity 0.8s ease-out, transform 0.8s ease-out; 
}

.fade-in-up.visible { 
    opacity: 1; 
    transform: translateY(0); 
}

footer { 
    background: #ffffff; 
    padding: 40px 0; 
    border-top: 1px solid var(--border-color); 
    text-align: center; 
    color: var(--text-muted); 
}