/* ============ SMARTER.IA — Design System ============ */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=DM+Serif+Display&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --navy: #0f1a2e;
    --navy-light: #1a2d4a;
    --blue: #2563eb;
    --blue-soft: #3b82f6;
    --blue-pale: #dbeafe;
    --blue-ghost: #eff6ff;
    --teal: #0d9488;
    --teal-pale: #ccfbf1;
    --red: #ef4444;
    --surface: #ffffff;
    --surface-warm: #fafbfc;
    --surface-cool: #f1f5f9;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --shadow-sm: 0 1px 2px rgba(15,23,42,0.04);
    --shadow-md: 0 4px 16px rgba(15,23,42,0.06);
    --shadow-lg: 0 12px 40px rgba(15,23,42,0.08);
    --shadow-xl: 0 20px 60px rgba(15,23,42,0.1);
    --radius: 12px;
    --radius-lg: 20px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--surface);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ========== HEADER ========== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    transition: box-shadow 0.3s;
}
header.scrolled { box-shadow: var(--shadow-md); }

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-family: 'DM Sans', sans-serif;
    font-size: 1.35rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--navy);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 2px;
}
.logo .dot { color: var(--blue); }
.logo .ia {
    color: var(--blue);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    font-size: 1.1rem;
}

nav { display: flex; align-items: center; gap: 8px; }
nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s;
}
nav a:hover { color: var(--text-primary); background: var(--surface-cool); }
nav a.active { color: var(--blue); background: var(--blue-ghost); }

.btn-header {
    background: var(--navy);
    color: white !important;
    padding: 10px 22px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.25s;
    margin-left: 8px;
}
.btn-header:hover { background: var(--navy-light); transform: translateY(-1px); box-shadow: var(--shadow-md); }

.menu-toggle { display: none; cursor: pointer; padding: 8px; border-radius: 8px; }
.menu-toggle:hover { background: var(--surface-cool); }
.bar { width: 22px; height: 2px; background: var(--navy); display: block; margin: 5px 0; border-radius: 2px; transition: 0.3s; }

/* ========== SECTIONS ========== */
section { padding: 100px 40px; }
.section-inner { max-width: 1200px; margin: 0 auto; }

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--blue);
    margin-bottom: 16px;
}
.section-label::before {
    content: '';
    width: 20px;
    height: 2px;
    background: var(--blue);
    border-radius: 2px;
}

.section-title {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    color: var(--navy);
    margin-bottom: 16px;
    font-weight: 400;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.7;
    margin-bottom: 48px;
}

/* ========== BUTTONS ========== */
.btn-primary {
    background: var(--blue);
    color: white;
    padding: 14px 30px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.25s;
    border: none;
    cursor: pointer;
    font-family: inherit;
}
.btn-primary:hover { background: #1d4ed8; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.25); }

.btn-secondary {
    color: var(--text-secondary);
    padding: 14px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: 12px;
    transition: all 0.2s;
    border: 1px solid var(--border);
    background: none;
}
.btn-secondary:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-ghost); }

.btn-white {
    background: white;
    color: var(--navy);
    padding: 16px 36px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.25s;
    border: none;
    cursor: pointer;
    font-family: inherit;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* ========== CARDS ========== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 44px;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}
.card:hover { border-color: transparent; box-shadow: var(--shadow-lg); transform: translateY(-4px); }

/* ========== BACKGROUNDS ========== */
.bg-warm { background: var(--surface-warm); border-top: 1px solid var(--border-light); border-bottom: 1px solid var(--border-light); }
.bg-navy { background: var(--navy); color: white; position: relative; overflow: hidden; }
.bg-navy::before { content: ''; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px; background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%); }

/* ========== BADGE ========== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--blue-ghost);
    border: 1px solid var(--blue-pale);
    color: var(--blue);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

.pulse {
    width: 7px; height: 7px;
    background: var(--teal);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.4); }
}

/* ========== STEP NUMBER ========== */
.step-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--blue);
    background: var(--blue-pale);
    width: 28px; height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

/* ========== CHECK MARKS ========== */
.check { width: 20px; height: 20px; border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: 0.6rem; flex-shrink: 0; }
.check.blue { background: var(--blue-pale); color: var(--blue); }
.check.teal { background: var(--teal-pale); color: var(--teal); }

/* ========== FAQ ========== */
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; transition: all 0.3s; }
.faq-item:hover { border-color: var(--blue-pale); }
.faq-question {
    width: 100%; text-align: left; padding: 20px 24px; background: none; border: none;
    font-family: 'DM Sans', sans-serif; font-size: 0.95rem; font-weight: 600;
    color: var(--text-primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-chevron { font-size: 0.75rem; color: var(--text-tertiary); transition: transform 0.3s; flex-shrink: 0; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-item.open .faq-answer { max-height: 300px; }
.faq-answer-inner { padding: 0 24px 20px; font-size: 0.9rem; color: var(--text-secondary); line-height: 1.75; }

/* ========== FOOTER ========== */
footer { padding: 60px 40px 40px; border-top: 1px solid var(--border); }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-tertiary); line-height: 1.7; margin-top: 12px; max-width: 280px; }
.footer-col h4 { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-primary); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 0.85rem; color: var(--text-secondary); text-decoration: none; margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--blue); }
.footer-bottom { padding-top: 24px; border-top: 1px solid var(--border-light); display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { font-size: 0.78rem; color: var(--text-tertiary); }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 36px; height: 36px; border-radius: 8px; background: var(--surface-cool); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); text-decoration: none; font-size: 0.85rem; transition: all 0.2s; }
.footer-social a:hover { background: var(--blue-pale); color: var(--blue); }

/* ========== WHATSAPP FLOAT ========== */
.whatsapp-float {
    position: fixed; bottom: 28px; right: 28px; width: 56px; height: 56px;
    background: #25d366; color: white; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; text-decoration: none; z-index: 999;
    box-shadow: 0 4px 20px rgba(37,211,102,0.35); transition: all 0.25s;
}
.whatsapp-float:hover { transform: translateY(-3px) scale(1.05); box-shadow: 0 8px 30px rgba(37,211,102,0.4); }

/* ========== ARTICLE STYLES ========== */
.article-body { max-width: 760px; margin: 0 auto; padding: 140px 40px 80px; }
.article-body h1 { font-family: 'DM Serif Display', serif; font-size: clamp(2rem, 4vw, 2.8rem); color: var(--navy); font-weight: 400; line-height: 1.2; margin-bottom: 20px; }
.article-body h2 { font-family: 'DM Serif Display', serif; font-size: 1.6rem; color: var(--navy); font-weight: 400; margin-top: 48px; margin-bottom: 16px; }
.article-body h3 { font-size: 1.2rem; font-weight: 700; color: var(--navy); margin-top: 36px; margin-bottom: 12px; }
.article-body p { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.85; margin-bottom: 20px; }
.article-body ul, .article-body ol { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 20px; padding-left: 25px; line-height: 1.85; }
.article-body li { margin-bottom: 8px; }
.article-body a { color: var(--blue); text-decoration: none; }
.article-body a:hover { text-decoration: underline; }
.article-meta-bar { display: flex; gap: 20px; margin-bottom: 40px; padding-bottom: 24px; border-bottom: 1px solid var(--border); font-size: 0.85rem; color: var(--text-tertiary); }
.article-tag { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--blue); }
.highlight-box { background: var(--blue-ghost); border-left: 4px solid var(--blue); padding: 25px 30px; border-radius: 0 12px 12px 0; margin: 30px 0; }
.highlight-box p { color: var(--text-secondary); margin: 0; }

.article-cta-box {
    background: var(--blue-ghost); border: 1px solid var(--blue-pale);
    border-radius: 16px; padding: 32px 36px; margin-top: 48px;
}

/* ========== ARTICLE COMPONENTS ========== */
.code-block { background: var(--surface-cool); border: 1px solid var(--border); border-radius: 12px; padding: 20px; margin: 20px 0; font-family: 'JetBrains Mono', 'SF Mono', monospace; font-size: 0.88rem; color: var(--text-secondary); overflow-x: auto; white-space: pre-wrap; line-height: 1.7; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin: 30px 0; }
.feature-item, .feature-card { background: var(--surface-cool); border: 1px solid var(--border); border-radius: 16px; padding: 25px; }
.feature-item i, .feature-card i { color: var(--blue); font-size: 1.5rem; margin-bottom: 12px; }
.feature-item h4, .feature-card h4 { font-size: 1rem; margin: 0 0 8px; color: var(--navy); font-weight: 700; }
.feature-item p, .feature-card p { font-size: 0.9rem; color: var(--text-secondary); margin: 0; line-height: 1.65; }
.warning-box { background: #fef2f2; border-left: 4px solid #ef4444; padding: 25px 30px; border-radius: 0 12px 12px 0; margin: 30px 0; }
.warning-box p { color: var(--text-secondary); margin: 0; }
.warning-box strong { color: var(--text-primary); }
.step-box { background: var(--surface-cool); border: 1px solid var(--border); border-radius: 16px; padding: 30px; margin: 20px 0; }
.step-number { display: inline-block; background: var(--blue); color: white; width: 32px; height: 32px; border-radius: 50%; text-align: center; line-height: 32px; font-weight: 800; font-size: 0.85rem; margin-right: 12px; }
.step-box h4 { display: inline; font-size: 1.1rem; color: var(--navy); }
.step-box p { margin-top: 12px; color: var(--text-secondary); }
.step-box ul { color: var(--text-secondary); }
.comparison-table { width: 100%; border-collapse: collapse; margin: 30px 0; font-size: 0.95rem; }
.comparison-table th { background: var(--blue-ghost); padding: 15px; text-align: left; font-weight: 700; border-bottom: 2px solid var(--blue); color: var(--navy); }
.comparison-table td { padding: 15px; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.comparison-table tr:hover { background: var(--blue-ghost); }
.faq-section { margin-top: 60px; }
.faq-section details { margin-bottom: 15px; background: var(--surface-cool); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.faq-section summary { cursor: pointer; font-weight: 700; font-size: 1.05rem; color: var(--navy); }
.faq-section details p { color: var(--text-secondary); margin-top: 15px; line-height: 1.75; }
.article-cta { background: var(--blue-ghost); border: 1px solid var(--blue-pale); border-radius: 24px; padding: 50px 40px; text-align: center; margin: 60px 0 40px; }
.article-cta h3 { font-size: 1.5rem; margin-bottom: 15px; color: var(--navy); }
.article-cta p { color: var(--text-secondary); margin-bottom: 25px; }
.btn-article-cta { background: var(--blue); color: white !important; padding: 16px 35px; border-radius: 12px; font-weight: 700; text-decoration: none; display: inline-block; transition: 0.3s; }
.btn-article-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.25); color: white !important; text-decoration: none !important; }
.article-hero { padding: 140px 40px 40px; max-width: 760px; margin: 0 auto; }
.article-hero h1 { font-family: 'DM Serif Display', serif; font-size: clamp(2rem, 4vw, 2.8rem); color: var(--navy); font-weight: 400; line-height: 1.2; }
.article-content { max-width: 760px; margin: 0 auto; padding: 0 40px 80px; overflow-x: hidden; }
.article-content .comparison-table { display: block; overflow-x: auto; }
.article-content .feature-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.article-content h2 { font-family: 'DM Serif Display', serif; font-size: 1.6rem; color: var(--navy); font-weight: 400; margin-top: 48px; margin-bottom: 16px; }
.article-content h3 { font-size: 1.2rem; font-weight: 700; color: var(--navy); margin-top: 36px; margin-bottom: 12px; }
.article-content p { font-size: 1.05rem; color: var(--text-secondary); line-height: 1.85; margin-bottom: 20px; }
.article-content ul, .article-content ol { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 20px; padding-left: 25px; line-height: 1.85; }
.article-content li { margin-bottom: 8px; }
.article-content a { color: var(--blue); }
.article-content strong { color: var(--text-primary); }
.article-subtitle { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.6; }
.article-info { display: flex; gap: 25px; margin-bottom: 50px; padding-bottom: 30px; border-bottom: 1px solid var(--border); font-size: 0.85rem; color: var(--text-tertiary); flex-wrap: wrap; }
.cta-section { background: var(--blue-ghost); border: 1px solid var(--blue-pale); border-radius: 24px; padding: 50px 40px; text-align: center; margin: 60px 0 40px; }
.cta-section h2 { font-family: 'DM Serif Display', serif; font-size: 1.5rem; color: var(--navy); margin-bottom: 15px; font-weight: 400; }
.cta-section p { color: var(--text-secondary); margin-bottom: 25px; }
.cta-button { background: var(--blue); color: white !important; padding: 16px 35px; border-radius: 12px; font-weight: 700; text-decoration: none !important; display: inline-block; transition: 0.3s; }
.cta-button:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.25); color: white !important; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .services-grid, .hero-grid { grid-template-columns: 1fr !important; }
    .method-steps-3 { grid-template-columns: 1fr !important; }
    .method-steps-3 .method-step { border-radius: var(--radius) !important; border: 1px solid var(--border) !important; }
    .programs-grid { grid-template-columns: 1fr !important; }
    .founder-grid { grid-template-columns: 1fr !important; }
    .footer-top { grid-template-columns: 1fr 1fr; }
    .comparison-grid { grid-template-columns: 1fr !important; }
    .diff-grid { grid-template-columns: 1fr !important; }
    .method-steps-2x2 { grid-template-columns: 1fr !important; }
}

@media (max-width: 768px) {
    .header-inner { padding: 0 20px; }
    nav {
        display: none; position: fixed; top: 72px; left: 0; right: 0;
        background: white; flex-direction: column; padding: 24px;
        gap: 4px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
    }
    nav.active { display: flex; }
    nav a { padding: 14px 16px; font-size: 1rem; }
    .btn-header { margin: 12px 0 0; text-align: center; display: block; }
    .menu-toggle { display: block; }
    section { padding: 64px 20px; }
    .hero-section { padding: 120px 20px 64px !important; }
    .hero-ctas { flex-direction: column; }
    .hero-ctas .btn-primary, .hero-ctas .btn-secondary { width: 100%; justify-content: center; }
    .founder-grid { gap: 30px !important; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 16px; }
    .content-2col { grid-template-columns: 1fr !important; }
}