/**
 * Header CSS - Responsive navigation component
 * Matches LoveToRead.AI Landing Page Design System
 */

/* CSS Variables - Matching Landing Page */
:root {
    --primary-green: #2e7d32;
    --primary-green-light: #4caf50;
    --primary-green-lighter: #66bb6a;
    --primary-green-dark: #1b5e20;
    --accent-green: #81c784;
    --bg-green-light: #e8f5e9;
    
    --text-dark: #1a1a1a;
    --text-medium: #4a4a4a;
    --text-light: #6a6a6a;
    
    --white: #ffffff;
    --off-white: #fafafa;
    --border-light: #e0e0e0;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
}

/* Header container */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(46, 125, 50, 0.1);
    transition: all var(--transition-normal);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.15);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 70px;
}

/* Logo styles */
.logo {
    display: flex;
    align-items: center;
    z-index: 1001;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: opacity var(--transition-normal);
}

.logo-link:hover {
    opacity: 0.85;
}

.logo-img {
    height: 45px;
    width: auto;
    margin-right: 12px;
    transition: height var(--transition-normal);
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-green);
    white-space: nowrap;
    transition: font-size var(--transition-normal);
}

/* Desktop navigation */
.desktop-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-medium);
    font-weight: 500;
    font-size: 16px;
    padding: 8px 0;
    position: relative;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

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

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-green), var(--primary-green-lighter));
    border-radius: 1px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { transform: scaleX(0); }
    to { transform: scaleX(1); }
}

/* Login/CTA button */
.login-btn {
    background: var(--primary-green);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--border-radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    box-shadow: var(--shadow-md);
    white-space: nowrap;
}

.login-btn:hover {
    background: var(--primary-green-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.login-btn:active {
    transform: translateY(0);
}

/* User menu */
.user-menu {
    position: relative;
}

.user-menu-button {
    background: var(--white);
    border: 2px solid var(--border-light);
    padding: 10px 16px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-normal);
    font-family: inherit;
    font-size: 15px;
    white-space: nowrap;
}

.user-menu-button:hover {
    border-color: var(--primary-green-light);
    background: var(--bg-green-light);
}

.user-menu-button:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.user-name {
    font-weight: 600;
    color: var(--text-dark);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-menu-arrow {
    font-size: 12px;
    color: var(--text-light);
    transition: transform var(--transition-normal);
}

.user-menu-button[aria-expanded="true"] .user-menu-arrow {
    transform: rotate(180deg);
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1002;
    overflow: hidden;
}

.user-menu-dropdown[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 12px 16px;
    color: var(--text-dark);
    text-decoration: none;
    border: none;
    background: none;
    text-align: left;
    font-size: 15px;
    font-family: inherit;
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    border-radius: 0;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background: var(--bg-green-light);
    color: var(--primary-green);
    outline: none;
}

.dropdown-item:first-of-type {
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
}

.dropdown-item:last-of-type {
    border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
}

.dropdown-divider {
    margin: 8px 0;
    border: none;
    border-top: 1px solid var(--border-light);
}

.logout-btn {
    color: #d32f2f !important;
    font-weight: 600;
}

.logout-btn:hover,
.logout-btn:focus {
    background: rgba(211, 47, 47, 0.1) !important;
    color: #c62828 !important;
}

/* Mobile menu button */
.mobile-menu-button {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-sm);
}

.mobile-menu-button:hover {
    background: var(--bg-green-light);
}

.mobile-menu-button:focus {
    outline: 2px solid var(--primary-green);
    outline-offset: 2px;
}

.hamburger-line {
    width: 24px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
    transform-origin: center;
}

.mobile-menu-button[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-button[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.mobile-menu-button[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile navigation overlay */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 998;
    backdrop-filter: blur(2px);
}

.mobile-nav-overlay[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
}

/* Mobile navigation menu */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 320px;
    max-width: 90vw;
    height: 100vh;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    background: var(--white);
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.15);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    display: flex;
    flex-direction: column;
}

.mobile-nav[aria-hidden="false"] {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: 24px;
    border-bottom: 1px solid var(--border-light);
    background: linear-gradient(135deg, var(--off-white), var(--bg-green-light));
    min-height: 70px;
    flex-shrink: 0;
}

.mobile-nav-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
}

.mobile-nav-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-fast);
}

.mobile-nav-close:hover {
    background: rgba(0, 0, 0, 0.05);
}

.mobile-nav-close:focus {
    outline: 2px solid var(--primary-green);
    outline-offset: 2px;
}

.close-line {
    position: absolute;
    width: 24px;
    height: 3px;
    background: var(--text-medium);
    border-radius: 2px;
    top: 50%;
    left: 50%;
    transform-origin: center;
    transition: all var(--transition-fast);
}

.close-line:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.close-line:nth-child(2) {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.mobile-nav-content {
    flex: 1;
    padding: 24px;
    padding-bottom: 60px;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

/* Mobile user info */
.mobile-user-info {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: linear-gradient(135deg, var(--bg-green-light), rgba(102, 187, 106, 0.1));
    border-radius: var(--border-radius-md);
    margin-bottom: 16px;
    border: 2px solid var(--primary-green-light);
}

.mobile-user-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-lighter));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.mobile-user-details {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.mobile-user-name {
    font-weight: 700;
    color: var(--text-dark);
    font-size: 16px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mobile-user-status {
    color: var(--primary-green);
    font-size: 14px;
    font-weight: 600;
}

.mobile-nav-divider {
    margin: 16px 0;
    border: none;
    border-top: 1px solid var(--border-light);
}

/* Mobile navigation links */
.mobile-nav-links {
    display: flex;
    flex-direction: column;
}

.mobile-nav-link {
    display: block;
    padding: 16px 0;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all var(--transition-normal);
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    width: 100%;
    font-family: inherit;
    position: relative;
}

.mobile-nav-link::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 0;
    background: var(--primary-green);
    border-radius: 2px;
    transition: height var(--transition-normal);
}

.mobile-nav-link:hover,
.mobile-nav-link:focus {
    color: var(--primary-green);
    padding-left: 8px;
    outline: none;
}

.mobile-nav-link:hover::before,
.mobile-nav-link:focus::before {
    height: 24px;
}

.mobile-nav-link.active {
    color: var(--primary-green);
    font-weight: 700;
}

.mobile-nav-link.active::before {
    height: 24px;
}

.mobile-nav-link.cta {
    background: linear-gradient(135deg, var(--primary-green), var(--primary-green-lighter));
    color: var(--white);
    padding: 16px;
    border-radius: var(--border-radius-md);
    text-align: center;
    margin-top: 16px;
    border-bottom: none;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.mobile-nav-link.cta::before {
    display: none;
}

.mobile-nav-link.cta:hover,
.mobile-nav-link.cta:focus {
    background: linear-gradient(135deg, var(--primary-green-dark), var(--primary-green));
    padding-left: 16px;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Body offset for fixed header */
body {
    padding-top: 70px;
}

/* Responsive design */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 20px;
    }
    
    .desktop-nav {
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 16px;
    }
    
    .desktop-nav {
        display: none;
    }
    
    .mobile-menu-button {
        display: flex;
    }
    
    .logo-img {
        height: 35px;
        margin-right: 8px;
    }
    
    .logo-text {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 12px;
        height: 60px;
    }
    
    .logo-img {
        height: 30px;
        margin-right: 6px;
    }
    
    .logo-text {
        font-size: 18px;
    }
    
    .mobile-nav {
        width: 100%;
        max-width: 100vw;
    }
    
    .mobile-nav-header {
        padding: 16px;
        min-height: 60px;
    }
    
    .mobile-nav-title {
        font-size: 18px;
    }
    
    .mobile-nav-content {
        padding: 16px;
        padding-bottom: 80px;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .header {
        background: var(--white);
        border-bottom: 2px solid var(--text-dark);
    }
    
    .nav-link:hover,
    .nav-link.active {
        color: var(--text-dark);
        background: var(--primary-green-light);
        padding: 8px 12px;
        border-radius: var(--border-radius-sm);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .header {
        position: relative;
        box-shadow: none;
    }
    
    .mobile-menu-button,
    .user-menu,
    .login-btn {
        display: none;
    }
}