/* Palette & Variables */
:root {
    --bg-main: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-accent: #F1F5F9;
    --bg-card: #FFFFFF;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --text-light: #F8FAFC;

    --brand-primary: #1E293B;
    --brand-accent: #2563EB;
    --brand-accent-hover: #1D4ED8;
    --brand-light: #EFF6FF;
    --border-color: #E2E8F0;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-pill: 9999px;

    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --transition: all 0.25s ease-in-out;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
    width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem;
}

.section { padding: 5rem 0; }
.section-gray { background-color: var(--bg-secondary); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.85rem 1.75rem; font-weight: 600; border-radius: var(--radius-pill);
    transition: var(--transition); cursor: pointer; border: 1px solid transparent; text-align: center;
}

.btn-primary { background-color: var(--brand-accent); color: #FFFFFF; box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2); }
.btn-primary:hover { background-color: var(--brand-accent-hover); transform: translateY(-1px); }
.btn-primary:disabled { background-color: #93C5FD; cursor: not-allowed; box-shadow: none; transform: none; }

.btn-secondary { background-color: #FFFFFF; color: var(--brand-primary); border-color: var(--border-color); }
.btn-secondary:hover { background-color: var(--bg-accent); }

.card {
    background: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--radius-md); padding: 2rem; transition: var(--transition);
}

.navbar {
    position: sticky; top: 0; z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color); height: 72px; display: flex; align-items: center;
}

.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--brand-primary); }
.nav-links { display: flex; align-items: center; gap: 2rem; }
.nav-links a { font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); }
.nav-links a:hover { color: var(--brand-accent); }

.dropdown { position: relative; }
.dropdown-toggle { display: flex; align-items: center; gap: 0.35rem; cursor: pointer; }
.dropdown-menu {
    position: absolute; top: 100%; left: 0; background: #FFFFFF;
    border: 1px solid var(--border-color); border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg); min-width: 320px; padding: 0.5rem 0;
    opacity: 0; visibility: hidden; transform: translateY(10px); transition: var(--transition); z-index: 1100;
}
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a { display: block; padding: 0.65rem 1.25rem; font-size: 0.9rem; }
.dropdown-menu a:hover { background-color: var(--brand-light); color: var(--brand-accent); }

.footer { background-color: var(--brand-primary); color: #94A3B8; padding: 4rem 0 2rem 0; font-size: 0.9rem; }