/* ============================================
   SolidairePro - Main Stylesheet
   Plateforme d'Aide Internationale Gratuite
   ============================================ */

:root {
    /* Primary Colors - Warm, humanitarian feel */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-bg: #eff6ff;

    /* Secondary Colors - Trust and warmth */
    --secondary: #f59e0b;
    --secondary-dark: #d97706;
    --secondary-light: #fbbf24;

    /* Accent - Hope and growth */
    --accent: #10b981;
    --accent-dark: #059669;
    --accent-light: #34d399;

    /* Neutrals */
    --dark: #1e293b;
    --dark-light: #334155;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f8fafc;
    --white: #ffffff;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    --gradient-warm: linear-gradient(135deg, var(--secondary) 0%, #ef4444 100%);
    --gradient-hero: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #3b82f6 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ============================================
   Base Styles
   ============================================ */

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--dark);
    background: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--dark);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.25rem; }
}

a {
    text-decoration: none;
    transition: var(--transition);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: var(--primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

.btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-outline-light {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline-light:hover {
    background: var(--white);
    color: var(--primary);
}

.btn-light {
    background: var(--white);
    color: var(--primary);
}

.btn-light:hover {
    background: var(--light);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    padding: 1rem 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
    padding: 0.75rem 0;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    color: var(--white);
    font-size: 1.25rem;
}

.brand-text {
    color: var(--dark);
}

.brand-accent {
    color: var(--primary);
}

.navbar:not(.scrolled) .brand-text,
.navbar:not(.scrolled) .nav-link {
    color: var(--white);
}

.navbar:not(.scrolled) .brand-icon {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    color: var(--dark);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
}

.navbar:not(.scrolled) .nav-link:hover {
    color: var(--secondary-light);
}

.btn-nav {
    padding: 0.5rem 1.25rem;
}

.navbar:not(.scrolled) .btn-nav {
    border-color: var(--white);
    color: var(--white);
}

.navbar:not(.scrolled) .btn-nav:hover {
    background: var(--white);
    color: var(--primary);
}

/* ============================================
   Section Styling
   ============================================ */

section {
    position: relative;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}

.section-title {
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--gray);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: 3rem;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--dark);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-brand .brand-text {
    color: var(--white);
}

.footer-brand .brand-accent {
    color: var(--secondary-light);
}

.footer-description {
    color: var(--gray-light);
    margin-bottom: 1.5rem;
    max-width: 300px;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border-radius: var(--radius);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 1.25rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray-light);
}

.footer-links a:hover {
    color: var(--white);
}

.footer-contact li {
    color: var(--gray-light);
    display: flex;
    align-items: center;
}

.footer-divider {
    border-color: rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.footer-bottom {
    text-align: center;
    color: var(--gray-light);
    font-size: 0.875rem;
}

/* ============================================
   Utility Classes
   ============================================ */

.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--secondary) !important; }
.text-accent { color: var(--accent) !important; }
.text-gray { color: var(--gray) !important; }

.bg-primary { background: var(--primary) !important; }
.bg-primary-bg { background: var(--primary-bg) !important; }
.bg-light { background: var(--light) !important; }
.bg-dark { background: var(--dark) !important; }

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 991px) {
    .navbar-collapse {
        background: var(--white);
        padding: 1rem;
        border-radius: var(--radius-md);
        margin-top: 1rem;
        box-shadow: var(--shadow-lg);
    }

    .navbar:not(.scrolled) .navbar-collapse .nav-link {
        color: var(--dark);
    }

    .navbar:not(.scrolled) .navbar-collapse .btn-nav {
        color: var(--primary);
        border-color: var(--primary);
    }
}

@media (max-width: 768px) {
    .section-header {
        margin-bottom: 2rem;
    }
}