/* 
 * Queen's Networking Society - Modern Enhanced Design
 * Instagram-Inspired Blue Aesthetic
 */

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

:root {
    /* Enhanced Color Palette - Vibrant Blues */
    --color-primary: #0047AB;           /* Cobalt Blue */
    --color-primary-dark: #003380;      /* Deep Blue */
    --color-primary-light: #0066FF;     /* Bright Blue */
    --color-accent: #00B4D8;            /* Sky Blue */
    --color-accent-light: #90E0EF;      /* Light Cyan */
    --color-gradient-1: #0047AB;
    --color-gradient-2: #0066FF;
    --color-gradient-3: #00B4D8;
    --color-background: #F0F7FF;        /* Soft Blue White */
    --color-white: #ffffff;
    --color-text: #1a1a2e;              /* Rich Black */
    --color-text-light: #4a5568;        /* Medium Grey */
    --color-border: #E0EFFF;
    --color-card-bg: #FFFFFF;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    
    /* Border Radius */
    --border-radius: 12px;
    --border-radius-lg: 20px;
    
    /* Shadows - Enhanced */
    --shadow-sm: 0 2px 8px rgba(0, 71, 171, 0.08);
    --shadow-md: 0 8px 24px rgba(0, 71, 171, 0.12);
    --shadow-lg: 0 16px 48px rgba(0, 71, 171, 0.16);
    --shadow-xl: 0 24px 64px rgba(0, 71, 171, 0.2);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: all var(--transition-fast);
}

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

/* ===== LAYOUT & CONTAINERS ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

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

.section-title {
    text-align: center;
    position: relative;
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 5px;
    background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
    border-radius: 3px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: translateX(-50%) scaleX(1); }
    50% { opacity: 0.7; transform: translateX(-50%) scaleX(1.2); }
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    font-size: 1.2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-family: inherit;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-xl);
    color: var(--color-white);
}

.btn-large {
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
}

/* ===== LOGO STYLING ===== */
.logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    display: block;
    transition: transform var(--transition-normal);
}

.logo:hover {
    transform: rotate(5deg) scale(1.05);
}

/* ===== ACCESSIBILITY ===== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    z-index: 100;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    padding: 1rem 0;
    transition: all var(--transition-normal);
}

.header.scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-lg);
}

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

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

.brand-name h1 {
    font-size: 1.25rem;
    margin-bottom: 0;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

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

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    padding: 0.5rem 1rem;
    position: relative;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary-light);
    background: rgba(0, 71, 171, 0.05);
}

.nav-link.active {
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    box-shadow: var(--shadow-sm);
}

/* Mobile Menu Button */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 28px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2));
    position: relative;
    transition: all var(--transition-fast);
    border-radius: 2px;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 28px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2));
    left: 0;
    transition: transform var(--transition-fast);
    border-radius: 2px;
}

.hamburger::before {
    top: -9px;
}

.hamburger::after {
    bottom: -9px;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, #E0F2FE 0%, #DBEAFE 50%, #BFDBFE 100%);
    padding-top: calc(var(--spacing-xl) + 80px);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,102,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0,180,216,0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-gradient-1) 0%, var(--color-gradient-2) 50%, var(--color-gradient-3) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
    font-weight: 800;
    line-height: 1.1;
}

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

.hero-subtitle {
    font-size: 1.6rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    color: var(--color-text-light);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero .btn {
    animation: fadeInUp 0.8s ease 0.6s backwards;
}

/* ===== ABOUT SECTION ===== */
.about {
    background-color: var(--color-white);
}

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

.about-card {
    background: linear-gradient(135deg, #FFFFFF 0%, #F0F7FF 100%);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,102,255,0.1), transparent);
    transition: left 0.5s;
}

.about-card:hover::before {
    left: 100%;
}

.about-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent-light);
}

.about-card h3 {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.8rem;
}

.highlight-list {
    list-style: none;
    text-align: left;
}

.highlight-list li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-lg);
    position: relative;
    font-size: 1.1rem;
    color: var(--color-text);
    font-weight: 500;
}

.highlight-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary-light);
    font-weight: bold;
    font-size: 1.4rem;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== TEAM SECTION ===== */
.team {
    background: linear-gradient(180deg, var(--color-background) 0%, #FFFFFF 100%);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.team-member {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
}

.team-member::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
    border-radius: var(--border-radius-lg);
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.team-member:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow: var(--shadow-xl);
}

.team-member:hover::after {
    opacity: 1;
}

.member-avatar {
    width: 110px;
    height: 110px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
    display: flex;
    align-items: center;
    justify-content: center;
    border: 5px solid var(--color-white);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.team-member:hover .member-avatar {
    transform: scale(1.1) rotate(5deg);
}

.avatar-initial {
    color: var(--color-white);
    font-size: 2.5rem;
    font-weight: 700;
}

.member-name {
    margin-bottom: var(--spacing-xs);
    font-size: 1.3rem;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.member-role {
    color: var(--color-text-light);
    font-size: 1rem;
    line-height: 1.5;
}

/* ===== JOIN & FAQ SECTION ===== */
.join {
    background: linear-gradient(180deg, #FFFFFF 0%, var(--color-background) 100%);
}

.join-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

.signup-card,
.faq-card {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--color-border);
    transition: all var(--transition-normal);
}

.signup-card:hover,
.faq-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.signup-card h3,
.faq-card h3 {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.8rem;
}

.form-info {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(0,71,171,0.05), rgba(0,180,216,0.05));
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-primary-light);
}

.form-info strong {
    color: var(--color-primary);
}

.form-info ul {
    list-style-position: inside;
    margin-top: var(--spacing-sm);
}

.form-info li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    color: var(--color-text);
}

.form-note {
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-style: italic;
}

/* FAQ Accordion */
.faq-container {
    margin-top: var(--spacing-md);
}

.faq-item {
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--color-accent);
}

.faq-toggle {
    display: none;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-sm);
    cursor: pointer;
    font-weight: 600;
    color: var(--color-text);
    transition: all var(--transition-fast);
    font-size: 1.1rem;
}

.faq-question:hover {
    color: var(--color-primary-light);
    padding-left: var(--spacing-md);
}

.faq-icon {
    font-size: 1.8rem;
    font-weight: 300;
    transition: transform var(--transition-normal);
    color: var(--color-primary-light);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0,71,171,0.1), rgba(0,180,216,0.1));
    border-radius: 50%;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
    padding: 0;
}

.faq-toggle:checked ~ .faq-answer {
    max-height: 300px;
    padding-bottom: var(--spacing-md);
}

.faq-toggle:checked + .faq-question .faq-icon {
    transform: rotate(45deg);
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    color: white;
}

.faq-answer p {
    margin-bottom: 0;
    padding: 0 var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 1.05rem;
}

/* ===== FOOTER ===== */
.footer {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.footer-brand h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
    font-size: 1.4rem;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.footer-copyright {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-contact h4,
.footer-social h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer-contact a {
    color: var(--color-accent-light);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.footer-contact a:hover {
    color: var(--color-white);
    text-decoration: underline;
}

.social-icons {
    display: flex;
    gap: var(--spacing-md);
}

.social-icons a {
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.social-icons a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px) scale(1.1);
}

.social-icon {
    width: 24px;
    height: 24px;
    fill: var(--color-white);
    transition: fill var(--transition-fast);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Tablet Styles (768px and below) */
@media (max-width: 768px) {
    h2 {
        font-size: 2rem;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    /* Navigation for Mobile */
    .menu-toggle {
        display: block;
    }
    
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 85%;
        max-width: 350px;
        height: 100vh;
        background: linear-gradient(135deg, var(--color-white) 0%, var(--color-background) 100%);
        box-shadow: var(--shadow-xl);
        transition: right var(--transition-normal);
        padding: 100px var(--spacing-lg) var(--spacing-lg);
        z-index: 1000;
    }
    
    .nav.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
        font-size: 1.2rem;
        border-radius: var(--border-radius);
    }
    
    .menu-toggle.active .hamburger {
        background-color: transparent;
    }
    
    .menu-toggle.active .hamburger::before {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .menu-toggle.active .hamburger::after {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    /* Join Section */
    .join-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-brand {
        flex-direction: column;
        align-items: center;
    }
    
    .social-icons {
        justify-content: center;
    }
    
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile Styles (480px and below) */
@media (max-width: 480px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .brand-name h1 {
        font-size: 1.1rem;
    }
}

/* Large Desktop (1200px and above) */
@media (min-width: 1200px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 4rem;
    }
}