/* /assets/css/style.css */
:root {
    --primary: #4F46E5; /* Indigo 600 */
    --primary-hover: #4338ca;
    --secondary: #10B981; /* Emerald 500 */
    --dark: #111827;
    --light: #F3F4F6;
    --white: #ffffff;
    --gray: #6B7280;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background: var(--light); color: var(--dark); line-height: 1.6; display: flex; flex-direction: column; min-height: 100vh; }

/* Layout */
header { background: var(--white); box-shadow: 0 1px 3px rgba(0,0,0,0.1); padding: 1rem 0; position: sticky; top: 0; z-index: 100; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.nav-flex { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--dark); text-decoration: none; letter-spacing: -0.5px; }
.logo span { color: var(--primary); }

main { flex: 1; padding: 40px 0; }

/* Hero Section */
.hero { text-align: center; padding: 60px 20px; margin-bottom: 40px; }
.hero h1 { font-size: 3rem; font-weight: 800; margin-bottom: 15px; background: linear-gradient(90deg, var(--primary) 0%, #8b5cf6 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 1.2rem; color: var(--gray); max-width: 600px; margin: 0 auto; }

/* Tool Cards Grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px; }
.tool-card { background: var(--white); padding: 30px; border-radius: var(--radius); text-decoration: none; color: var(--dark); transition: transform 0.2s, box-shadow 0.2s; border: 1px solid rgba(0,0,0,0.05); display: flex; flex-direction: column; align-items: center; text-align: center; }
.tool-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--primary); }
.tool-icon { font-size: 3rem; margin-bottom: 15px; }
.tool-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; }
.tool-desc { color: var(--gray); font-size: 0.9rem; }

/* Upload Area UI */
.upload-box { background: var(--white); border: 2px dashed #cbd5e1; border-radius: var(--radius); padding: 60px 20px; text-align: center; cursor: pointer; transition: 0.3s; position: relative; max-width: 700px; margin: 0 auto; }
.upload-box:hover, .upload-box.dragover { border-color: var(--primary); background: #eff6ff; }
.btn-primary { background: var(--primary); color: white; border: none; padding: 15px 30px; font-size: 1rem; font-weight: 600; border-radius: 8px; cursor: pointer; transition: 0.2s; display: inline-block; text-decoration: none; }
.btn-primary:hover { background: var(--primary-hover); transform: scale(1.02); }
.btn-primary:disabled { background: var(--gray); cursor: not-allowed; }

/* Footer */
footer { background: var(--white); border-top: 1px solid #e5e7eb; padding: 40px 0; margin-top: auto; text-align: center; color: var(--gray); font-size: 0.9rem; }
.footer-links a { color: var(--dark); text-decoration: none; margin: 0 10px; font-weight: 500; }
.footer-links a:hover { color: var(--primary); }

/* Utilities */
.hidden { display: none; }
.status-msg { margin-top: 20px; font-weight: 500; }
.error { color: #ef4444; }
.success { color: var(--secondary); }

/* Mobile */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .nav-flex { flex-direction: column; gap: 10px; }
}