/**
 * AgentX Main Stylesheet
 * Mobile-first responsive design
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
    /* Color Palette */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-secondary: #7c3aed;
    --color-accent: #0ea5e9;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-text-primary: #0f172a;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-error: #dc2626;
    --color-success: #16a34a;
    --color-warning: #ea580c;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

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

    /* Container Max Width */
    --container-max-width: 1200px;
}

/* ========================================
   Global Reset
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: var(--line-height-base);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header - Mobile-First Design
   ======================================== */
.site-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.site-header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

/* Logo/Brand */
.nav-brand {
    z-index: 1001;
}

.nav-brand img.logo {
    height: 32px;
    width: auto;
}

.nav-brand a {
    text-decoration: none;
}

.nav-brand .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Mobile Menu Toggle (Hamburger) */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    width: 44px;
    height: 44px;
    position: relative;
    border-radius: 8px;
    transition: background-color 0.2s;
    z-index: 1001;
}

.mobile-menu-toggle:hover {
    background-color: var(--color-bg-alt);
}

.mobile-menu-toggle:active {
    background-color: var(--color-border);
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all 0.3s ease-in-out;
    border-radius: 2px;
    position: absolute;
}

.hamburger-line:nth-child(1) {
    top: 14px;
}

.hamburger-line:nth-child(2) {
    top: 21px;
}

.hamburger-line:nth-child(3) {
    top: 28px;
}

/* Hamburger Animation: Bars → X */
.mobile-menu-toggle.is-active .hamburger-line:nth-child(1) {
    transform: rotate(45deg);
    top: 21px;
}

.mobile-menu-toggle.is-active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.is-active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg);
    top: 21px;
}

/* Navigation Menu - MOBILE FIRST */
.nav-menu {
    display: none;
}

.nav-menu.is-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    min-height: calc(100vh - 64px);
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    z-index: 999;
    overflow-y: auto;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Nav Links Container */
.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.nav-link {
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: all 0.2s;
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    min-height: 44px;
}

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

.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-bg-alt);
}

/* Nav Divider (Mobile Only) */
.nav-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-md) 0;
}

/* Nav Actions Container */
.nav-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-actions .nav-link {
    font-size: 0.938rem;
}

.nav-actions .btn {
    width: 100%;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Desktop Navigation - 768px+ */
@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }

    .nav-menu {
        display: flex !important;
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-lg);
        position: static;
        padding: 0;
        border: none;
        box-shadow: none;
        background: transparent;
        overflow: visible;
        animation: none;
    }

    .nav-menu.is-open {
        position: static;
        top: auto;
        left: auto;
        right: auto;
        bottom: auto;
    }

    .nav-links {
        flex-direction: row;
        gap: var(--spacing-lg);
    }

    .nav-link {
        padding: 0.5rem 0;
        font-size: 0.938rem;
        min-height: auto;
    }

    .nav-link:hover {
        background-color: transparent;
    }

    .nav-link.active {
        background-color: transparent;
    }

    .nav-divider {
        display: none;
    }

    .nav-actions {
        flex-direction: row;
        gap: var(--spacing-sm);
    }

    .nav-actions .btn {
        width: auto;
        min-height: auto;
    }
}

/* ========================================
   Container
   ======================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-xl);
    }
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    flex: 1;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-size: 0.938rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

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

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

.btn-text:hover {
    color: var(--color-primary);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

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

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: 2fr repeat(4, 1fr);
    }
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-section p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    color: var(--color-text-secondary);
    transition: color 0.2s;
}

.social-links a:hover {
    color: var(--color-primary);
}

/* ========================================
   Newsletter Form
   ======================================== */
.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.newsletter-form input[type="email"] {
    flex: 1;
    padding: 0.625rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.newsletter-form button {
    white-space: nowrap;
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
    text-align: center;
}

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.py-1 { padding-top: var(--spacing-xs); padding-bottom: var(--spacing-xs); }
.py-2 { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-3 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-4 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-5 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.px-1 { padding-left: var(--spacing-xs); padding-right: var(--spacing-xs); }
.px-2 { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-3 { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-4 { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }
.px-5 { padding-left: var(--spacing-xl); padding-right: var(--spacing-xl); }