/* ==========================================================================
   MyStartup — Main Stylesheet
   Modern, clean design system for a startup landing site.
   ========================================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #818cf8;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-success: #16a34a;
    --color-error: #dc2626;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 4px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 12px 32px rgba(0,0,0,.12);
    --transition: .25s ease;
    --container: 1120px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
ul { list-style: none; }

/* ---------- Utility ---------- */
.container { width: 90%; max-width: var(--container); margin: 0 auto; }
.content-narrow { max-width: 720px; margin: 0 auto; }
.section { padding: 5rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title { font-size: 2rem; text-align: center; margin-bottom: .5rem; }
.section-subtitle { text-align: center; color: var(--color-text-muted); margin-bottom: 3rem; font-size: 1.1rem; }
.highlight { color: var(--color-primary); }

/* ---------- Buttons ---------- */
.btn {
    display: inline-block;
    padding: .75rem 1.75rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: .95rem;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all var(--transition);
    text-align: center;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
}
.btn-outline {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: transparent;
}
.btn-outline:hover {
    background: var(--color-primary);
    color: #fff;
}
.btn-lg { padding: 1rem 2.25rem; font-size: 1.05rem; }
.btn-full { width: 100%; }

/* ==========================================================================
   Navigation
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0; left: 0; width: 100%;
    z-index: 1000;
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: var(--shadow); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav-logo { font-size: 1.25rem; font-weight: 700; color: var(--color-text); display: flex; align-items: center; gap: 1rem; }
.nav-logo:hover { color: var(--color-primary); }
.logo-icon { height: 1.6em; width: auto; vertical-align: middle; }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: .95rem;
    transition: color var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }
.nav-cta {
    background: var(--color-primary) !important;
    color: #fff !important;
    padding: .5rem 1.25rem;
    border-radius: var(--radius);
}
.nav-cta:hover { background: var(--color-primary-dark) !important; }

/* Hamburger */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: .5rem; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text); margin: 5px 0; border-radius: 2px; transition: var(--transition); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
    padding: 10rem 0 6rem;
    text-align: center;
    background: linear-gradient(170deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}
.hero h1 { font-size: 3.25rem; line-height: 1.2; margin-bottom: 1.25rem; }
.hero-sub { font-size: 1.2rem; color: var(--color-text-muted); max-width: 600px; margin: 0 auto 2.5rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ==========================================================================
   Page Header (inner pages)
   ========================================================================== */
.page-header {
    padding: 8rem 0 3rem;
    text-align: center;
    background: var(--color-bg-alt);
}
.page-header h1 { font-size: 2.5rem; margin-bottom: .75rem; }
.page-header p { color: var(--color-text-muted); font-size: 1.15rem; max-width: 560px; margin: 0 auto; }

/* ==========================================================================
   Feature Cards
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 2rem;
}
.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-icon { font-size: 2rem; margin-bottom: 1rem; }
.feature-card h3 { margin-bottom: .5rem; }
.feature-card p { color: var(--color-text-muted); font-size: .95rem; }

/* ==========================================================================
   Stats
   ========================================================================== */
.stats-section { background: var(--color-primary); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 2rem; text-align: center; }
.stat-number { display: block; font-size: 2.5rem; font-weight: 800; }
.stat-label { font-size: .9rem; opacity: .85; }

/* ==========================================================================
   Services
   ========================================================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.service-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.service-icon { font-size: 2.25rem; margin-bottom: 1rem; }
.service-card h3 { margin-bottom: .5rem; }
.service-card p { color: var(--color-text-muted); font-size: .95rem; margin-bottom: 1rem; }
.service-features { padding-left: 1.25rem; list-style: disc; }
.service-features li { color: var(--color-text-muted); font-size: .9rem; margin-bottom: .3rem; }
.btn-case-study { margin-top: 1.25rem; display: inline-block; font-size: .9rem; }

/* Case Study Pages */
.case-study-content { max-width: 800px; margin: 0 auto; }
.case-study-content h2 { margin-top: 2.5rem; margin-bottom: .75rem; }
.case-study-content h3 { margin-top: 2rem; margin-bottom: .5rem; }
.case-study-content p { margin-bottom: 1rem; color: var(--color-text-muted); }
.case-study-content ul { padding-left: 1.25rem; list-style: disc; margin-bottom: 1.5rem; }
.case-study-content ul li { color: var(--color-text-muted); font-size: .95rem; margin-bottom: .4rem; }
.case-study-meta { display: flex; gap: 2rem; flex-wrap: wrap; margin-bottom: 2.5rem; padding: 1.5rem; background: var(--color-bg-alt); border-radius: var(--radius-lg); }
.case-study-meta div { flex: 1; min-width: 140px; }
.case-study-meta span { display: block; }
.case-study-meta .meta-label { font-size: .8rem; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); margin-bottom: .25rem; }
.case-study-meta .meta-value { font-weight: 700; font-size: 1rem; color: var(--color-text); }
.case-study-back { margin-bottom: 2rem; display: inline-block; font-weight: 500; }
.case-study-image { margin: 2rem 0; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--color-border); }
.case-study-image img { width: 100%; height: auto; display: block; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.5rem; margin-top: 1.5rem; margin-bottom: 2rem; }
.result-card { background: var(--color-bg-alt); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.75rem; }
.result-icon { font-size: 2rem; margin-bottom: .75rem; }
.result-card h3 { margin-bottom: .5rem; font-size: 1.05rem; }
.result-card p { color: var(--color-text-muted); font-size: .93rem; margin-bottom: 0; }
.case-study-cta { margin-top: 3rem; padding: 2.5rem; background: var(--color-bg-alt); border-radius: var(--radius-lg); text-align: center; }
.case-study-cta h2 { font-size: 1.5rem; margin-bottom: .5rem; }
.case-study-cta p { color: var(--color-text-muted); margin-bottom: 1.5rem; }

/* ==========================================================================
   Team
   ========================================================================== */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; text-align: center; }
.team-card { padding: 2rem; }
.team-avatar { font-size: 3.5rem; margin-bottom: 1rem; }
.team-card h3 { margin-bottom: .25rem; }
.team-role { color: var(--color-text-muted); font-size: .9rem; }

/* ==========================================================================
   CTA Banner
   ========================================================================== */
.cta-section { background: var(--color-bg-alt); }
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: 2rem; margin-bottom: .5rem; }
.cta-inner p { color: var(--color-text-muted); margin-bottom: 2rem; font-size: 1.1rem; }

/* ==========================================================================
   Contact Form
   ========================================================================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: .4rem; font-size: .95rem; }
.form-group input,
.form-group textarea {
    width: 100%;
    padding: .75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}
.form-status { margin-top: 1rem; font-size: .95rem; }
.form-status.success { color: var(--color-success); }
.form-status.error { color: var(--color-error); }

.contact-info { padding: 2rem; background: var(--color-bg-alt); border-radius: var(--radius-lg); }
.contact-info h3 { margin-bottom: 1rem; }
.contact-info li { margin-bottom: .75rem; }
.contact-info a { color: var(--color-primary); }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer { background: var(--color-text); color: #cbd5e1; padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2rem; margin-bottom: 3rem; }
.footer h3, .footer h4 { color: #fff; margin-bottom: 1rem; }
.footer a { color: #94a3b8; }
.footer a:hover { color: #fff; }
.footer li { margin-bottom: .5rem; }
.footer-bottom { border-top: 1px solid #334155; padding-top: 1.5rem; text-align: center; font-size: .85rem; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.25rem; }
    .hero { padding: 8rem 0 4rem; }
    .page-header { padding: 7rem 0 2.5rem; }
    .section { padding: 3.5rem 0; }

    /* Mobile nav */
    .nav-toggle { display: block; }
    .nav-links {
        position: fixed;
        top: 64px; left: 0; right: 0;
        background: var(--color-bg);
        flex-direction: column;
        padding: 2rem;
        gap: 1.25rem;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-120%);
        transition: transform var(--transition);
    }
    .nav-links.open { transform: translateY(0); }

    /* Footer stacking */
    .footer-grid { grid-template-columns: 1fr; }

    /* Stats */
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}