/* ===== CSS Variables ===== */
:root {
    --primary-color: #dd0031;
    --secondary-color: #c3002f;
    --accent-color: #0066ff;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --sidebar-width: 280px;
    --header-height: 120px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-light);
    overflow-x: hidden;
}

/* Prevent context menu on images */
img {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    pointer-events: none;
}

/* ===== Header ===== */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    font-size: 3rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 0;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-left: 4rem;
}

/* ===== Sidebar Navigation ===== */
.sidebar {
    position: fixed;
    left: -300px;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    padding: 2rem 0;
    overflow-y: auto;
    transition: var(--transition);
    z-index: 1000;
}

.sidebar.active {
    left: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem 1rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1rem;
}

.sidebar-header h2 {
    font-size: 1.3rem;
    color: var(--primary-color);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-dark);
    padding: 0.5rem;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--primary-color);
    transform: rotate(90deg);
}

.nav-list {
    list-style: none;
    padding: 0;
}

.nav-list li {
    margin: 0;
}

.nav-list a {
    display: block;
    padding: 0.9rem 1.5rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
    font-weight: 500;
}

.nav-list a:hover {
    background: var(--bg-light);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    padding-left: 2rem;
}

.nav-list a.active {
    background: linear-gradient(90deg, rgba(221, 0, 49, 0.1) 0%, transparent 100%);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== Menu Toggle Button ===== */
.menu-toggle {
    position: fixed;
    left: 20px;
    top: 140px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

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

/* ===== Main Content ===== */
.main-content {
    margin-left: 0;
    padding: 2rem 0;
    min-height: calc(100vh - var(--header-height));
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===== Welcome Section ===== */
.welcome-section {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border-left: 5px solid var(--primary-color);
}

.welcome-section h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.welcome-section p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.info-box {
    background: linear-gradient(135deg, rgba(221, 0, 49, 0.05) 0%, rgba(0, 102, 255, 0.05) 100%);
    padding: 1.5rem;
    border-radius: 10px;
    border-left: 4px solid var(--accent-color);
    margin-top: 1.5rem;
}

.info-box p {
    margin: 0;
    color: var(--text-dark);
}

/* ===== Content Sections ===== */
.content-section {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    transition: var(--transition);
    scroll-margin-top: 140px;
}

.content-section:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--bg-light);
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 700;
}

.section-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 0.5rem 1.2rem;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.section-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.text-content h3 {
    color: var(--text-dark);
    margin: 1.5rem 0 1rem;
    font-size: 1.3rem;
}

.text-content p {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
    font-size: 1.05rem;
}

.text-content ul {
    list-style: none;
    padding: 0;
}

.text-content li {
    padding: 0.7rem 0;
    color: var(--text-light);
    line-height: 1.6;
    font-size: 1rem;
}

.text-content li strong {
    color: var(--text-dark);
}

/* ===== Image Protection ===== */
.image-container {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--bg-light);
    transition: var(--transition);
}

.image-container:hover {
    box-shadow: var(--shadow-lg);
}

.protected-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.5rem;
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
    z-index: 10;
}

/* Show overlay when user tries to interact */
.image-container.show-protection .image-overlay {
    background: rgba(221, 0, 49, 0.95);
    opacity: 1;
}

/* ===== Footer ===== */
.footer {
    background: linear-gradient(135deg, var(--text-dark) 0%, #333 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.9;
}

.footer a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
}

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

/* ===== Responsive Design ===== */
@media (max-width: 968px) {
    .section-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .image-container {
        order: -1;
    }

    .header .logo h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.95rem;
        margin-left: 3rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .section-header h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 85%;
        max-width: 300px;
    }

    .header {
        padding: 1.5rem 0;
    }

    .logo {
        flex-direction: row;
        gap: 0.5rem;
    }

    .logo-icon {
        font-size: 2rem;
    }

    .logo h1 {
        font-size: 1.3rem;
    }

    .tagline {
        font-size: 0.85rem;
        margin-left: 2.5rem;
    }

    .menu-toggle {
        top: 110px;
        width: 45px;
        height: 45px;
    }

    .container {
        padding: 0 1rem;
    }

    .welcome-section {
        padding: 2rem 1.5rem;
    }

    .content-section {
        padding: 1.5rem;
    }

    .section-header h2 {
        font-size: 1.3rem;
    }

    .text-content h3 {
        font-size: 1.1rem;
    }

    .text-content p,
    .text-content li {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.1rem;
    }

    .tagline {
        display: none;
    }

    .welcome-section h2 {
        font-size: 1.5rem;
    }

    .section-badge {
        font-size: 0.75rem;
        padding: 0.4rem 1rem;
    }
}

/* ===== Scrollbar Styling ===== */
.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--bg-light);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* ===== Accessibility ===== */
.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;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* ===== Print Styles ===== */
@media print {
    .header,
    .sidebar,
    .menu-toggle,
    .footer {
        display: none;
    }

    .main-content {
        margin-left: 0;
    }

    .content-section {
        page-break-inside: avoid;
    }

    .image-overlay {
        display: none !important;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-section {
    animation: fadeIn 0.5s ease-out;
}

/* ===== Loading State ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(221, 0, 49, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}