/*
CHANGE LOG
File: /static/css/ai_index.css
Document: CSS Stylesheet
Purpose: Memory System landing page with 8 use case cards and interface tour
Version History:
2025-09-11 v10.0 - Added use case cards grid and interface tour with modal functionality
2025-08-23 v9.0 - Kept bright theme; spacing tuned; accessibility focus; no SHIELD; pairs with assistant_instructions block
*/

/* Base */
*{box-sizing:border-box}
:root{
--page:#f5f7fb;
--hero1:#7aa2ff;
--hero2:#9b7bff;
--text:#1b2330;
--muted:#5a6473;
--card:#ffffff;
--line:#e6e9f0;
--brand:#6777ff;
--accent:#00b884;
--focus:#294cff33;
}
html,body{margin:0;padding:0;background:var(--page);color:var(--text);
font:16px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Ubuntu,Arial,sans-serif}
a{color:inherit;text-decoration:none}
.sr-only{position:absolute;left:-10000px;top:auto;width:1px;height:1px;overflow:hidden}

/* Container */
.ns-container{max-width:1120px;margin:0 auto;padding:0 20px}

/* Hero (bright) */
.ms-hero{
background:linear-gradient(135deg,var(--hero1),var(--hero2));
color:#fff;text-align:center;padding:56px 20px 30px;border-bottom:1px solid rgba(255,255,255,.18);
border-radius:0 0 24px 24px; box-shadow:0 8px 28px rgba(50,50,93,.18); margin-bottom:40px
}
.ms-hero h1{margin:0 0 8px;font-size:2.6rem;font-weight:700}
.ms-hero-subtext{margin:0 0 10px;opacity:.95;font-size:1.1rem}

/* Hero CTA */
.ms-hero-cta{margin-top:24px}
.ms-primary-cta{
display:inline-block;padding:14px 28px;background:#fff;color:var(--brand);
border-radius:12px;font-weight:600;font-size:1.1rem;
box-shadow:0 4px 12px rgba(0,0,0,.15);transition:all .2s ease
}
.ms-primary-cta:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.2)}
.ms-secondary-links{margin-top:16px;display:flex;justify-content:center;align-items:center;gap:8px}
.ms-link-muted{color:rgba(255,255,255,.8);font-size:.9rem}
.ms-link-muted:hover{color:#fff}
.ms-separator{color:rgba(255,255,255,.6)}

/* Section Headers */
.ms-use-cases-section, .ms-interface-section{
max-width:1120px;margin:0 auto 60px;padding:0 20px
}
.ms-use-cases-section h2, .ms-interface-section h2{
text-align:center;font-size:2.2rem;margin:0 0 8px;font-weight:700
}
.ms-section-subtitle{
text-align:center;color:var(--muted);font-size:1.1rem;margin:0 0 40px
}

/* Use Case Cards Grid */
.ms-use-cases-grid{
display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
gap:24px;margin-bottom:20px
}

.ms-use-case-card{
background:var(--card);border:1px solid var(--line);border-radius:16px;
overflow:hidden;transition:all .3s ease;text-decoration:none;color:inherit;
box-shadow:0 4px 12px rgba(0,0,0,.08)
}
.ms-use-case-card:hover{
transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.15);
border-color:#d0d7e4
}
.ms-use-case-card:focus{outline:3px solid var(--focus);outline-offset:2px}

.ms-use-case-card img{
width:100%;height:200px;object-fit:cover;display:block
}

.ms-use-case-content{padding:20px}
.ms-use-case-content h3{
margin:0 0 8px;font-size:1.2rem;font-weight:600;color:var(--text)
}
.ms-use-case-content p{
margin:0;color:var(--muted);font-size:.95rem;line-height:1.5
}

/* Interface Tour Grid */
.ms-interface-grid{
display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
gap:28px
}

.ms-interface-card{
background:var(--card);border:1px solid var(--line);border-radius:16px;
overflow:hidden;box-shadow:0 4px 12px rgba(0,0,0,.08);
transition:all .3s ease
}
.ms-interface-card:hover{
transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.12)
}

.ms-interface-image{
position:relative;cursor:pointer;overflow:hidden;height:180px
}
.ms-interface-image img{
width:100%;height:100%;object-fit:cover;transition:transform .3s ease
}
.ms-interface-image:hover img{transform:scale(1.05)}

.ms-interface-content{padding:20px}
.ms-interface-content h3{
margin:0 0 8px;font-size:1.1rem;font-weight:600
}
.ms-interface-content p{
margin:0 0 12px;color:var(--muted);font-size:.9rem;line-height:1.5
}
.ms-interface-link{
color:var(--brand);font-weight:500;font-size:.9rem;
text-decoration:none;transition:color .2s ease
}
.ms-interface-link:hover{color:#5563e8}

/* Image Modal */
.ms-modal{
display:none;position:fixed;z-index:1000;left:0;top:0;
width:100%;height:100%;background:rgba(0,0,0,.8);
animation:fadeIn .3s ease
}
.ms-modal-content{
position:relative;margin:auto;padding:20px;
width:90%;max-width:1000px;top:50%;transform:translateY(-50%)
}
.ms-modal-close{
position:absolute;top:-10px;right:10px;color:#fff;
font-size:35px;font-weight:bold;cursor:pointer;z-index:1001
}
.ms-modal-close:hover{color:#ccc}
#ms-modal-image{
width:100%;height:auto;border-radius:8px;
box-shadow:0 8px 32px rgba(0,0,0,.5)
}

@keyframes fadeIn{
from{opacity:0}
to{opacity:1}
}

/* Cards Section (testimonials) */
.ms-cards-section{max-width:1120px;margin:0 auto 40px;padding:0 20px}
.ms-cards-grid{display:grid;gap:20px;grid-template-columns:1fr}

/* Secondary CTA */
.ms-secondary-cta-section{
text-align:center;margin:40px auto 60px;padding:0 20px
}
.ms-secondary-cta{
display:inline-block;padding:14px 28px;background:var(--brand);color:#fff;
border-radius:12px;font-weight:600;font-size:1.1rem;
box-shadow:0 4px 12px rgba(103,119,255,.3);transition:all .2s ease
}
.ms-secondary-cta:hover{
transform:translateY(-2px);box-shadow:0 6px 20px rgba(103,119,255,.4)
}

/* Convert Banner */
.nsg-convert-banner{
background:linear-gradient(135deg,#ff9472,#f2709c);color:#fff;
text-align:center;padding:16px 20px;margin-bottom:20px
}
.nsg-convert-banner h3{margin:0 0 8px;font-size:1.1rem}
.nsg-convert-banner p{margin:0 0 12px;opacity:.9}
.nsg-convert-btn{
display:inline-block;padding:8px 16px;background:#fff;color:#f2709c;
border-radius:6px;font-weight:600;text-decoration:none
}

/* Toast */
.nsg-toast{
position:fixed;bottom:20px;left:50%;transform:translateX(-50%);
background:#333;color:#fff;padding:12px 20px;border-radius:6px;
opacity:0;transition:opacity .3s ease;z-index:1000
}
.nsg-toast.show{opacity:1}

/* Mobile Responsive */
@media (max-width:768px){
.ms-hero{padding:40px 20px 20px}
.ms-hero h1{font-size:2rem}
.ms-use-cases-grid{grid-template-columns:1fr}
.ms-interface-grid{grid-template-columns:1fr}
.ms-modal-content{width:95%;padding:10px}
.ms-modal-close{top:-15px;right:5px;font-size:30px}
}

@media (max-width:480px){
.ms-hero h1{font-size:1.8rem}
.ms-primary-cta, .ms-secondary-cta{padding:12px 20px;font-size:1rem}
.ms-use-case-content{padding:16px}
.ms-interface-content{padding:16px}
}

/* Print */
@media print{
body{background:#fff;color:#000}
.ms-use-case-card, .ms-interface-card{box-shadow:none}
.ms-modal{display:none !important}
}