/* ==================== RESET & BASE ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Vibrant & Professional */
    --color-purple: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --color-blue: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%);
    --color-green: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --color-orange: linear-gradient(135deg, #f2994a 0%, #f2c94c 100%);
    --color-pink: linear-gradient(135deg, #ee0979 0%, #ff6a00 100%);
    --color-teal: linear-gradient(135deg, #134e5e 0%, #71b280 100%);
    --color-indigo: linear-gradient(135deg, #4e54c8 0%, #8f94fb 100%);
    
    /* Neutral Colors */
    --color-dark: #2d3748;
    --color-gray: #4a5568;
    --color-light-gray: #cbd5e0;
    --color-white: #ffffff;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.15);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.2);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--color-dark);
    background: #f7fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== HEADER ==================== */
.main-header {
    background: var(--color-purple);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

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

.logo h1 a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    transition: var(--transition);
}

.logo h1 a:hover {
    opacity: 0.9;
    transform: scale(1.05);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

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

.main-nav a:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

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

/* ==================== HERO SECTION ==================== */
.hero-section {
    background: var(--color-purple);
    color: white;
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 1s ease;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 1.2s ease;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background: white;
    color: #667eea;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255,255,255,0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

/* Floating Cards Animation */
.hero-decoration {
    position: relative;
    height: 400px;
}

.floating-card {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(255,255,255,0.15);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

.card-1 { top: 0; left: 0; animation-delay: 0s; }
.card-2 { top: 0; right: 0; animation-delay: 1.5s; }
.card-3 { bottom: 0; left: 50px; animation-delay: 3s; }
.card-4 { bottom: 0; right: 50px; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== SECTIONS ==================== */
.content-section {
    padding: 5rem 0;
}

.section-purple { background: linear-gradient(135deg, #f3e7ff 0%, #e9d5ff 100%); }
.section-blue { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); }
.section-green { background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%); }
.section-orange { background: linear-gradient(135deg, #fed7aa 0%, #fbbf24 100%); }
.section-pink { background: linear-gradient(135deg, #fce7f3 0%, #fbcfe8 100%); }
.section-teal { background: linear-gradient(135deg, #ccfbf1 0%, #99f6e4 100%); }
.section-indigo { background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%); }

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.section-number {
    font-size: 3rem;
    font-weight: 700;
    background: var(--color-purple);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: 2.5rem;
    color: var(--color-dark);
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-gray);
    margin-bottom: 2rem;
    text-align: center;
}

/* ==================== CARDS ==================== */
.content-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 2rem;
    align-items: center;
    transition: var(--transition);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 4rem;
    flex-shrink: 0;
}

.card-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-gray);
}

/* ==================== PROFILE CARD ==================== */
.profile-card-main {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3rem;
}

.profile-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: var(--color-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.avatar-initial {
    font-size: 4rem;
    font-weight: 700;
    color: white;
}

.profile-name {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--color-dark);
}

.profile-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.detail-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.detail-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.detail-item strong {
    display: block;
    color: var(--color-dark);
    margin-bottom: 0.25rem;
}

.detail-item p {
    color: var(--color-gray);
    line-height: 1.6;
}

.btn-outline {
    background: transparent;
    color: #2193b0;
    border: 2px solid #2193b0;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-outline:hover {
    background: #2193b0;
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ==================== TIMELINE ==================== */
.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--color-green);
}

.timeline-item {
    position: relative;
    margin-bottom: 2rem;
    padding-left: 2rem;
}

.timeline-marker {
    position: absolute;
    left: -2.3rem;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: white;
    border: 4px solid #11998e;
    box-shadow: var(--shadow-sm);
}

.timeline-content {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.timeline-date {
    font-weight: 700;
    color: #11998e;
    margin-bottom: 0.5rem;
}

.timeline-content h4 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--color-dark);
}

.timeline-content p {
    color: var(--color-gray);
}

/* ==================== ASSIGNMENT GRID ==================== */
.assignment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.assignment-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.assignment-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.assignment-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.assignment-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-dark);
}

.assignment-card p {
    color: var(--color-gray);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.assignment-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.meta-tag {
    background: #fef3c7;
    color: #92400e;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.btn-card {
    background: var(--color-orange);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(242, 153, 74, 0.4);
}

/* ==================== CITATION GRID ==================== */
.citation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.citation-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.citation-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.citation-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.citation-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-dark);
}

.citation-card p {
    color: var(--color-gray);
    margin-bottom: 1.5rem;
}

/* ==================== ACTIVITY LOG ==================== */
.activity-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.activity-item {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    transition: var(--transition);
}

.activity-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(10px);
}

.activity-date {
    font-weight: 700;
    color: #134e5e;
    font-size: 0.875rem;
}

.activity-content h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--color-dark);
}

.activity-content p {
    color: var(--color-gray);
    line-height: 1.6;
}

/* ==================== RESOURCES GRID ==================== */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.resource-card {
    background: white;
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.resource-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.resource-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-dark);
}

.resource-card p {
    color: var(--color-gray);
    margin-bottom: 1.5rem;
}

.btn-outline-light {
    background: transparent;
    color: #4e54c8;
    border: 2px solid #4e54c8;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-outline-light:hover {
    background: #4e54c8;
    color: white;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.social-btn {
    background: #4e54c8;
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    transition: var(--transition);
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

/* ==================== FOOTER ==================== */
.main-footer {
    background: var(--color-indigo);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.footer-info p {
    opacity: 0.9;
    line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.9;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    padding-left: 5px;
}

.footer-contact p {
    opacity: 0.9;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.2);
    opacity: 0.8;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .burger-menu {
        display: flex;
    }
    
    .main-nav ul {
        display: none;
    }
    
    .main-nav.active ul {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-purple);
        padding: 1rem;
        gap: 0.5rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-decoration {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .profile-card-main {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .activity-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .assignment-grid,
    .citation-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }
}