/* simulateur.finance — Brand Tokens + Shared Styles */

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
    font-family: var(--font-ui);
    background: var(--color-primary);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }

:root {
    /* Couleurs principales */
    --color-primary: #0F172A;
    --color-primary-light: #1E293B;
    --color-accent: #3B82F6;
    --color-accent-hover: #2563EB;
    --color-success: #10B981;
    --color-success-hover: #059669;
    --color-indigo: #6366F1;
    --color-warning: #F59E0B;
    --color-error: #EF4444;

    /* Surfaces — dark (site dark-only) */
    --color-bg: #0F172A;
    --color-bg-alt: #1E293B;
    --color-bg-card: #1E293B;
    --color-border: #334155;
    --color-border-light: #1E293B;

    /* Texte — dark */
    --color-text: #F1F5F9;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #64748B;
    --color-text-inverse: #FFFFFF;

    /* Typographie */
    --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Tailles */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    /* Espacements */
    --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-12: 3rem;
    --space-16: 4rem;

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

    /* Ombres — dark */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Largeurs max */
    --max-w-content: 1200px;
    --max-w-narrow: 720px;
}

/* === Container === */
.container {
    width: 100%;
    max-width: var(--max-w-content);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* === Nav === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-4) 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    transition: background var(--transition-base), box-shadow var(--transition-base);
}
.nav.scrolled {
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
}
.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-size: var(--text-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
}
.nav-logo span { color: var(--color-accent); }
.nav-links {
    display: none;
    gap: var(--space-8);
    align-items: center;
}
.nav-links a {
    font-size: var(--text-sm);
    color: #94A3B8;
    transition: color var(--transition-fast);
    position: relative;
}
.nav-links a:hover { color: #F1F5F9; }
.nav-links a.active {
    color: var(--color-accent);
}
.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    border-radius: var(--radius-full);
}
.nav-cta {
    display: inline-flex;
    padding: var(--space-2) var(--space-6);
    background: var(--color-accent);
    color: white;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}
.nav-cta:hover { background: var(--color-accent-hover); }
.nav-mobile-toggle {
    display: flex;
    align-items: center;
    color: #94A3B8;
}
.nav-mobile-toggle svg { width: 24px; height: 24px; }

/* Mobile menu */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
    font-size: var(--text-xl);
    color: #E2E8F0;
}
.mobile-menu-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-6);
    color: #94A3B8;
}
.mobile-menu-close svg { width: 24px; height: 24px; }

/* Nav auth — always visible */
.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

@media (min-width: 1024px) {
    .nav-links { display: flex; }
    .nav-mobile-toggle { display: none; }
}

/* === Sim Page Layout === */
.sim-page {
    padding-top: 80px;
}
.sim-header {
    padding: var(--space-8) 0 var(--space-6);
    border-bottom: 1px solid #1E293B;
}
.sim-header h1 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    color: #F1F5F9;
    margin-bottom: var(--space-2);
}
.sim-header p {
    font-size: var(--text-base);
    color: #94A3B8;
    max-width: 600px;
}

/* === Buttons (shared) === */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-8);
    background: var(--color-accent);
    color: white;
    font-weight: 600;
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-family: var(--font-ui);
    text-decoration: none;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59,130,246,0.25);
}
.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59,130,246,0.35);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-primary svg { width: 18px; height: 18px; }

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-8);
    background: transparent;
    color: #94A3B8;
    font-weight: 500;
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
    border: 1px solid #334155;
    transition: all var(--transition-fast);
    font-family: var(--font-ui);
    text-decoration: none;
    cursor: pointer;
}
.btn-secondary:hover {
    color: #F1F5F9;
    border-color: #64748B;
    background: rgba(255,255,255,0.03);
}

/* === Input (shared) === */
.input-number {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: #0F172A;
    border: 1px solid #334155;
    border-radius: var(--radius-md);
    color: #F1F5F9;
    font-size: var(--text-base);
    font-family: var(--font-ui);
    font-variant-numeric: tabular-nums;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input-number::placeholder { color: #475569; }
.input-number:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}

/* === Footer === */
.footer {
    border-top: 1px solid #1E293B;
    padding: var(--space-12) 0 var(--space-8);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}
.footer-brand p {
    font-size: var(--text-sm);
    color: #64748B;
    margin-top: var(--space-2);
    max-width: 300px;
}
.footer-col h4 {
    font-size: var(--text-sm);
    font-weight: 600;
    color: #E2E8F0;
    margin-bottom: var(--space-4);
}
.footer-col a {
    display: block;
    font-size: var(--text-sm);
    color: #64748B;
    padding: var(--space-1) 0;
    transition: color var(--transition-fast);
}
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom {
    border-top: 1px solid #1E293B;
    padding-top: var(--space-6);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-4);
    font-size: var(--text-xs);
    color: #475569;
}

@media (min-width: 640px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 1024px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

/* === Auth Modal === */
.auth-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
}
.auth-modal.open { display: flex; justify-content: center; align-items: center; }
.auth-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
}
.auth-panel {
    position: relative;
    background: #1E293B;
    border: 1px solid #334155;
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    width: 90%;
    max-width: 400px;
    z-index: 1;
}
.auth-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: none;
    border: none;
    color: #64748B;
    cursor: pointer;
}
.auth-close svg { width: 20px; height: 20px; }
.auth-panel-header { text-align: center; margin-bottom: var(--space-6); }
.auth-form .input-group { margin-bottom: 0; }
.auth-msg {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    text-align: center;
    min-height: 20px;
}
.auth-msg.success { color: var(--color-success); }
.auth-msg.error { color: var(--color-error); }

/* === User Dropdown === */
.user-dropdown { position: relative; }
.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-accent);
    color: white;
    font-weight: 700;
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color var(--transition-fast);
}
.user-avatar:hover { border-color: rgba(59,130,246,0.5); }
.user-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: #1E293B;
    border: 1px solid #334155;
    border-radius: var(--radius-lg);
    min-width: 220px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    z-index: 50;
}
.user-dropdown.open .user-dropdown-menu { display: block; }
.user-dropdown-header {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid #334155;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.user-dropdown-header .user-email {
    font-size: var(--text-xs);
    color: #94A3B8;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 150px;
}
.user-plan-badge {
    font-size: 10px;
    font-weight: 700;
    color: var(--color-accent);
    background: rgba(59,130,246,0.1);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}
.user-dropdown-menu a,
.user-dropdown-menu button {
    display: block;
    width: 100%;
    text-align: left;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: #94A3B8;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-ui);
    transition: background var(--transition-fast), color var(--transition-fast);
}
.user-dropdown-menu a:hover,
.user-dropdown-menu button:hover {
    background: rgba(59,130,246,0.08);
    color: #F1F5F9;
}

/* === Skeleton Loading (shared utility) === */
.skeleton {
    background: linear-gradient(90deg, #1E293B 0%, #334155 50%, #1E293B 100%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
    border-radius: var(--radius-md);
}
@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(59,130,246,0.2);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }