:root {
    --primary: #1a365d;
    --primary-light: #2c5282;
    --secondary: #c9a227;
    --accent: #38b2ac;
    --dark: #1a202c;
    --light: #f7fafc;
    --gray: #718096;
    --border: #e2e8f0;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    color: var(--dark);
    line-height: 1.7;
    background: #ffffff;
    min-height: 100vh;
}

.navbar {
    padding: 1rem 0;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.navbar-brand { font-weight: 800; font-size: 1.5rem; color: var(--primary) !important; }
.navbar-brand span { color: var(--secondary); }

.nav-link { color: var(--dark) !important; font-weight: 500; padding: 0.5rem 1rem !important; transition: color 0.3s ease; }
.nav-link:hover { color: var(--primary) !important; }

.btn-nav {
    background: var(--primary); color: white !important;
    padding: 0.6rem 1.5rem !important; border-radius: 8px;
    font-weight: 600; transition: all 0.3s ease; border: none;
}
.btn-nav:hover { background: var(--primary-light); transform: translateY(-2px); }

.signup-container {
    background: white; border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    overflow: hidden; max-width: 600px; width: 100%;
}

.signup-header { background: var(--primary); color: white; padding: 2rem; text-align: center; }
.signup-header h2 { font-weight: 700; margin-bottom: 0.5rem; }

.logo-link { display: inline-block; transition: transform 0.3s ease; }
.logo-link:hover { transform: scale(1.05); }

.signup-body { padding: 2rem; }

.form-control {
    border-radius: 8px; padding: 0.75rem 1rem;
    border: 1px solid var(--border); transition: all 0.3s ease; font-size: 0.95rem;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 0.2rem rgba(26, 54, 93, 0.25); }

.form-label { font-weight: 600; color: var(--dark); margin-bottom: 0.5rem; }

.btn-primary-custom {
    background: var(--primary); color: white;
    padding: 0.875rem 1.5rem; border-radius: 8px;
    font-weight: 600; border: none; transition: all 0.3s ease; width: 100%;
}
.btn-primary-custom:hover {
    background: var(--primary-light); transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(26, 54, 93, 0.2); color: white;
}
.btn-primary-custom:disabled { opacity: 0.8; transform: none; box-shadow: none; }

.password-requirements {
    position: absolute; top: 100%; left: 0; right: 0; z-index: 1000;
    font-size: 0.75em;
    background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px);
    border: 1px solid var(--border); border-radius: 8px;
    padding: 0.75rem; margin-top: 0.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); display: none;
}
.password-requirements.show { display: block; }
.password-requirements ul { list-style-type: none; padding-left: 0; margin-bottom: 0; }
.password-requirements li { padding: 0.25rem 0; transition: color 0.3s ease; }
.password-requirements li::before { content: '❌ '; margin-right: 0.5rem; }
.password-requirements li.valid::before { content: '✅ '; }

.input-group-text {
    border-radius: 0 8px 8px 0; border-left: none;
    background: var(--light); cursor: pointer;
}

.text-center a { color: var(--primary); text-decoration: none; font-weight: 500; }
.text-center a:hover { text-decoration: underline; }

@media (max-width: 768px) {
    .signup-container { margin: 1rem; max-width: none; }
    .signup-header, .signup-body { padding: 1.5rem; }
}