/* Global Styles - Shared across all pages */
:root {
    --primary-color: #2A2B2E;
    --secondary-color: #0066FF;
    --accent-color: #60A5FA;
    --background-color: #F9FAFB;
    --surface-color: #FFFFFF;
    --text-color: #2C2C2C;
    --text-secondary: #64748B;
    --border-color: #E5E7EB;
    --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);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
}

/* Global Navigation */
.global-nav {
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 3rem;
}

.nav-logo {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    transition: var(--transition);
    flex-shrink: 0;
}

.nav-logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex: 0 0 auto;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

.login-btn {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.3);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.logout-btn {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 0.9rem;
}

.logout-btn:hover {
    background: var(--background-color);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    background: rgba(0, 102, 255, 0.1);
    color: var(--secondary-color);
}

.nav-link.active {
    color: var(--secondary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 3px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 3px;
}

/* Mobile Navigation Toggle */
.nav-mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Home Page Styles */
.home-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
    overflow-y: auto;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 2.5rem 0;
    margin-bottom: 2.5rem;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.gradient-text {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* Feature Grid */
.features {
    margin-bottom: 4rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.feature-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-color);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(96, 165, 250, 0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.feature-action {
    color: var(--secondary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    transition: var(--transition);
}

.feature-card:hover .feature-action {
    transform: translateX(4px);
}

/* Recent Activity Section */
.recent-activity {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
}

.activity-list {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    border: 1px solid var(--border-color);
}

.activity-placeholder {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

/* Footer */
.home-footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-secondary);
}

/* Chat Page Specific Wrapper */
.chat-page-wrapper {
    padding-top: 0;
}

.chat-page-wrapper .chat-container {
    max-width: 1200px;
    margin: 0 auto;
    height: calc(100vh - 73px); /* Subtract nav height */
    padding: 0 2rem;
}

.chat-page-wrapper .login-screen {
    height: calc(100vh - 73px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-page-wrapper .chat-header {
    padding: 1.5rem 0;
    margin-bottom: 1rem;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.chat-controls {
    display: flex;
    gap: 2rem;
    align-items: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        gap: 1rem;
    }

    .nav-logo {
        font-size: 1.5rem;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--surface-color);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        z-index: 100;
        gap: 0.5rem;
    }

    .nav-links.mobile-active {
        display: flex;
    }

    .nav-link {
        padding: 0.75rem 1rem;
        width: 100%;
        text-align: left;
    }

    .nav-link.active::after {
        display: none;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .login-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .user-name {
        display: none;
    }

    .nav-mobile-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .home-container {
        padding: 1rem;
    }

    .hero {
        padding: 2rem 0 !important;
    }

    /* Chat page mobile */
    .chat-page-wrapper .chat-container {
        padding: 0 1rem;
        height: calc(100vh - 60px);
    }

    .chat-main {
        border-radius: 12px;
    }

    /* Footer mobile */
    .home-footer {
        padding: 1.5rem 1rem;
        font-size: 0.875rem;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Global Button Styles - Override all default buttons */
button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    box-shadow: 0 2px 8px rgba(0, 102, 255, 0.2);
}

button:hover,
input[type="button"]:hover,
input[type="submit"]:hover,
input[type="reset"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 102, 255, 0.4);
}

button:active,
input[type="button"]:active,
input[type="submit"]:active,
input[type="reset"]:active {
    transform: translateY(0);
}

button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Secondary button variant */
button.secondary,
input[type="button"].secondary,
input[type="reset"] {
    background: var(--surface-color);
    color: var(--text-color);
    border: 2px solid var(--border-color);
    box-shadow: none;
}

button.secondary:hover,
input[type="button"].secondary:hover,
input[type="reset"]:hover {
    background: var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Danger button variant */
button.danger {
    background: linear-gradient(135deg, #dc2626, #ef4444);
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
}

button.danger:hover {
    box-shadow: 0 4px 16px rgba(220, 38, 38, 0.4);
}

/* Mobile-Specific Improvements */
@media (max-width: 768px) {
    /* Larger tap targets for mobile */
    button,
    input[type="button"],
    input[type="submit"],
    input[type="reset"],
    .login-btn,
    .logout-btn {
        min-height: 44px;
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
    }
    
    /* Prevent zoom on input focus (iOS) */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="number"],
    input[type="search"],
    textarea,
    select {
        font-size: 16px !important;
        min-height: 44px;
    }
    
    /* Better spacing on mobile */
    .hero {
        padding: 2rem 0 !important;
    }
    
    .hero-title {
        font-size: 2rem !important;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1.1rem !important;
    }
    
    /* Nav improvements */
    .nav-logo {
        font-size: 1.5rem !important;
    }
    
    .nav-link {
        padding: 0.75rem 1rem !important;
    }
    
    /* Feature cards */
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
    }
    
    .feature-title {
        font-size: 1.25rem;
    }
}