/* BCA Academic Hub - Main Stylesheet */

/* CSS Variables */
:root {
    /* Primary Colors */
    --primary-dark: #1a2332;
    --primary-darker: #0f1419;
    --secondary-dark: #2d3e50;
    --accent-orange: #ff8c42;
    --accent-orange-hover: #ff9d5c;
    
    /* Text Colors */
    --text-light: #e8eaed;
    --text-muted: #9ca3af;
    --text-white: #ffffff;
    
    /* Background Colors */
    --bg-dark: #1a2332;
    --bg-card: #243447;
    --bg-card-hover: #2d3e50;
    
    /* Border & Shadow */
    --border-color: #374151;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.5);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* ===================================
   NAVIGATION BAR
   =================================== */
.navbar {
    background-color: var(--primary-darker);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

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

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-white);
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-orange);
}

.btn-login {
    background-color: var(--accent-orange);
    color: var(--text-white);
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.btn-login:hover {
    background-color: var(--accent-orange-hover);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-white);
    transition: 0.3s;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-darker) 100%);
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.version-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(255, 140, 66, 0.15);
    color: var(--accent-orange);
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 140, 66, 0.3);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

/* Search Container */
.search-container {
    margin-top: var(--spacing-lg);
}

.search-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 8px 12px;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.search-icon {
    font-size: 1.5rem;
    margin-right: 12px;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-light);
    font-size: 1rem;
    padding: 12px;
    outline: none;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.btn-search {
    background-color: var(--accent-orange);
    color: var(--text-white);
    padding: 12px 32px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-search:hover {
    background-color: var(--accent-orange-hover);
}

/* ===================================
   SECTIONS
   =================================== */
.quick-access-section,
.semester-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.section-title,
.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle,
.page-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.btn-secondary {
    display: inline-block;
    background-color: transparent;
    color: var(--accent-orange);
    padding: 14px 32px;
    border: 2px solid var(--accent-orange);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background-color: var(--accent-orange);
    color: var(--text-white);
}

/* ===================================
   SEMESTER CARDS
   =================================== */
.semester-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.semester-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: var(--spacing-lg);
    text-align: left;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
}

.semester-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-card-hover);
}

.semester-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.semester-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 4rem;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.05);
}

.semester-card h3 {
    font-size: 1.75rem;
    color: var(--text-white);
    margin-bottom: var(--spacing-xs);
}

.semester-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    letter-spacing: 1px;
}

.subject-list {
    list-style: none;
    margin: var(--spacing-sm) 0;
    color: var(--text-muted);
}

.subject-list li {
    padding: 4px 0;
}

.btn-explore {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--accent-orange);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.btn-explore:hover {
    color: var(--accent-orange-hover);
}

/* ===================================
   TECHNOLOGY TAGS
   =================================== */
.tech-tags-section {
    padding: var(--spacing-lg) 0;
    background-color: var(--primary-darker);
    overflow: hidden;
}

.tech-tags-scroll {
    display: flex;
    gap: var(--spacing-sm);
    animation: scroll 30s linear infinite;
    white-space: nowrap;
}

.tech-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-card);
    color: var(--text-light);
    padding: 10px 24px;
    border-radius: 25px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.tech-tag:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--accent-orange);
    transform: translateY(-2px);
}

.tech-icon {
    font-size: 1.2rem;
    display: inline-block;
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* ===================================
   TESTIMONIALS
   =================================== */
.testimonials-section {
    padding: var(--spacing-xl) 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.testimonial-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.student-avatar {
    font-size: 3rem;
}

.student-info h4 {
    color: var(--text-white);
    margin-bottom: 4px;
}

.student-info p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.rating {
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.testimonial-text {
    color: var(--text-muted);
    line-height: 1.8;
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--primary-darker);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.contact-info h2 {
    font-size: 2rem;
    color: var(--text-white);
    margin-bottom: var(--spacing-sm);
}

.contact-info p {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-item a {
    color: var(--accent-orange);
    text-decoration: none;
}

.contact-item a:hover {
    color: var(--accent-orange-hover);
}

/* Contact Form */
.contact-form {
    background-color: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    color: var(--text-light);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-orange);
}

.btn-submit {
    width: 100%;
    background-color: var(--accent-orange);
    color: var(--text-white);
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-submit:hover {
    background-color: var(--accent-orange-hover);
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--primary-darker);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-white);
}

.footer-text {
    color: var(--text-muted);
}

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   RESOURCE PAGES
   =================================== */

/* Simple Chat Box for AI Bot */
.chat-box {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.chat-messages {
    height: 450px;
    overflow-y: auto;
    background: var(--primary-dark);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
}

.user-message, .bot-message {
    padding: 12px 16px;
    margin-bottom: 12px;
    border-radius: 8px;
    line-height: 1.8;
    word-wrap: break-word;
}

.user-message {
    background: #2a4a6a;
    color: var(--text-light);
    text-align: right;
}

.bot-message {
    background: #1e3a52;
    color: var(--text-light);
    font-size: 0.95rem;
}

.bot-message strong {
    color: var(--accent-orange);
}

.bot-message pre {
    margin: 10px 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

.bot-message code {
    font-family: 'Consolas', 'Courier New', monospace;
}

.bot-message br {
    display: block;
    margin: 4px 0;
}

.chat-input-area {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.chat-input {
    flex: 1;
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--primary-dark);
    color: var(--text-light);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.chat-input:focus {
    border-color: var(--accent-orange);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-orange), #ff6b6b);
    color: var(--text-white);
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(255, 140, 66, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 140, 66, 0.4);
}

/* Floating Chatbot Button */
.chatbot-float-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-orange), #ff6b2b);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(255, 140, 66, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 999;
}

.chatbot-float-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(255, 140, 66, 0.6);
}

/* Chatbot Popup Window */
.chatbot-popup {
    position: fixed;
    bottom: 100px;
    right: 24px;
    width: 400px;
    height: 550px;
    background: var(--bg-card);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    display: none;
    flex-direction: column;
    z-index: 1000;
    overflow: hidden;
}

.chatbot-header {
    background: linear-gradient(135deg, var(--accent-orange), #ff6b2b);
    padding: 16px;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chatbot-header h3 {
    margin: 0;
    font-size: 1.1rem;
}

.close-chatbot {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chatbot-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 16px;
    overflow: hidden;
}

.chatbot-popup .chat-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 12px;
    min-height: 0;
}

.chatbot-popup .chat-input-area {
    flex-shrink: 0;
    margin: 0;
}

.resource-section {
    padding: var(--spacing-xl) 0;
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.resource-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.resource-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.resource-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.resource-card h3 {
    color: var(--text-white);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.resource-list {
    list-style: none;
    margin: var(--spacing-sm) 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.resource-list li {
    margin: 0;
}

.resource-list a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.4;
    word-break: break-word;
}

.resource-list a:hover {
    color: var(--accent-orange);
}

.pdf-icon {
    color: var(--accent-orange);
}

/* Back Button */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-card);
    color: var(--text-light);
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-bottom: var(--spacing-md);
}

.back-btn:hover {
    background-color: var(--bg-card-hover);
    color: var(--accent-orange);
}