/* ============================================
   AIE PLATFORM — DESIGN SYSTEM v3.0
   Institutional / Official Theme
   Target: Training Center Directors, Qualiopi Managers
   Philosophy: Trust, Seriousness, Official, Administrative
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Primary: Institutional Navy (from logo) */
    --color-navy-950: #0f2744;
    --color-navy-900: #1e3a5f;
    --color-navy-800: #243b53;
    --color-navy-700: #334e68;
    --color-navy-600: #486581;
    --color-navy-500: #627d98;
    --color-navy-400: #829ab1;
    --color-navy-300: #9fb3c8;
    --color-navy-200: #bcccdc;
    --color-navy-100: #d9e2ec;
    --color-navy-50: #f0f4f8;

    /* Accent: Official Gold (certificates, quality) */
    --color-gold-600: #9a7b1a;
    --color-gold-500: #b8931f;
    --color-gold-400: #c9a227;
    --color-gold-300: #e8c547;
    --color-gold-200: #f5e08f;
    --color-gold-100: #faf0c8;
    --color-gold-50: #fdf9eb;

    /* Secondary: Forest Green (success, validation) */
    --color-forest-600: #1b4332;
    --color-forest-500: #2d6a4f;
    --color-forest-400: #40916c;
    --color-forest-300: #74b793;
    --color-forest-200: #a3cfb7;
    --color-forest-100: #d1e7db;

    /* Neutrals - Warm grays for official feel */
    --color-white: #ffffff;
    --color-gray-50: #f8f9fa;
    --color-gray-100: #f1f3f4;
    --color-gray-200: #e8eaed;
    --color-gray-300: #dadce0;
    --color-gray-400: #9aa0a6;
    --color-gray-500: #5f6368;
    --color-gray-600: #3c4043;
    --color-gray-700: #2d2d2d;
    --color-gray-800: #1f1f1f;
    --color-gray-900: #0d0d0d;

    /* Semantic */
    --color-success: #2d6a4f;
    --color-warning: #b8931f;
    --color-error: #c53030;
    --color-info: #1e3a5f;

    /* Typography */
    --font-display: 'Inter', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Border Radius - More conservative for official look */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Shadows - Subtle, professional */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.05);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.01em;
    color: var(--color-navy-900);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }

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

p {
    color: var(--color-gray-600);
}

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

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.5;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-navy-900);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--color-navy-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-navy-900);
    border: 2px solid var(--color-navy-200);
}

.btn-secondary:hover {
    background: var(--color-navy-50);
    border-color: var(--color-navy-300);
}

.btn-gold {
    background: linear-gradient(135deg, var(--color-gold-400) 0%, var(--color-gold-500) 100%);
    color: var(--color-navy-950);
    font-weight: 600;
}

.btn-gold:hover {
    background: linear-gradient(135deg, var(--color-gold-500) 0%, var(--color-gold-600) 100%);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-navy-900);
    border: 2px solid var(--color-navy-900);
}

.btn-outline:hover {
    background: var(--color-navy-900);
    color: var(--color-white);
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--color-gray-300);
    box-shadow: var(--shadow-md);
}

.card-highlight {
    border-color: var(--color-navy-200);
    box-shadow: var(--shadow-md);
}

.card-highlight:hover {
    border-color: var(--color-navy-300);
    box-shadow: var(--shadow-lg);
}

.card-featured {
    border: 2px solid var(--color-gold-400);
    box-shadow: 0 0 0 4px var(--color-gold-50);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-full);
    background: var(--color-gray-100);
    color: var(--color-gray-600);
}

.badge-navy {
    background: var(--color-navy-50);
    color: var(--color-navy-700);
}

.badge-gold {
    background: var(--color-gold-50);
    color: var(--color-gold-600);
    border: 1px solid var(--color-gold-200);
}

.badge-success {
    background: var(--color-forest-100);
    color: var(--color-forest-600);
}

.badge-qualiopi {
    background: linear-gradient(135deg, var(--color-navy-900) 0%, var(--color-navy-800) 100%);
    color: var(--color-white);
}

/* ============================================
   OFFICIAL/TRUST ELEMENTS
   ============================================ */
.official-border {
    border-left: 4px solid var(--color-navy-900);
    padding-left: var(--space-4);
}

.certificate-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--color-gold-50) 0%, var(--color-gold-100) 100%);
    border: 1px solid var(--color-gold-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-gold-600);
}

.trust-banner {
    background: var(--color-navy-50);
    border-top: 1px solid var(--color-navy-100);
    border-bottom: 1px solid var(--color-navy-100);
}

/* ============================================
   FORM INPUTS
   ============================================ */
.input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-gray-700);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.input:focus {
    outline: none;
    border-color: var(--color-navy-500);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.input::placeholder {
    color: var(--color-gray-400);
}

select.input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.25rem;
    padding-right: 2.5rem;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav-link {
    color: var(--color-gray-600);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-navy-900);
}

.nav-link.active {
    color: var(--color-navy-900);
    font-weight: 600;
}

/* ============================================
   SECTION BACKGROUNDS
   ============================================ */
.bg-light {
    background-color: var(--color-gray-50);
}

.bg-navy-light {
    background-color: var(--color-navy-50);
}

.bg-gradient-subtle {
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-50) 100%);
}

/* ============================================
   STATS & NUMBERS
   ============================================ */
.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-navy-900);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   QUALIOPI SPECIFIC
   ============================================ */
.qualiopi-indicator {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
}

.qualiopi-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background: var(--color-navy-900);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* ============================================
   LOGO CLIENTS / TRUST SECTION
   ============================================ */
.logo-grid {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
}

.logo-item {
    opacity: 0.7;
    filter: grayscale(100%);
    transition: all var(--transition-base);
}

.logo-item:hover {
    opacity: 1;
    filter: grayscale(0%);
}

/* ============================================
   UTILITIES
   ============================================ */
.text-balance {
    text-wrap: balance;
}

.text-navy {
    color: var(--color-navy-900);
}

.text-gold {
    color: var(--color-gold-500);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   DIVIDERS
   ============================================ */
.divider {
    height: 1px;
    background: var(--color-gray-200);
}

.divider-navy {
    height: 2px;
    width: 60px;
    background: var(--color-navy-900);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Stagger animations */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }