/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

:root {
    /* Color Variables */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --dark: #0f172a;
    --darker: #0a1120;
    --light: #f8fafc;
    --lighter: #ffffff;
    --gray: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Global Settings */
    --transition: all 0.3s ease;
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
    --glass: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    
    /* Light Mode Variables */
    --text: #0f172a;
    --text-light: #64748b;
    --bg: #f8fafc;
    --bg-gradient: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(0, 0, 0, 0.1);
    --hero-text-gradient: linear-gradient(to right, #1e293b, #475569);
    --stat-gradient: linear-gradient(to right, #a3c1ff, var(--accent));
    --badge-bg: rgba(37, 99, 235, 0.15);
    --badge-text: #2563eb;
    --btn-outline-bg: transparent;
    --btn-outline-border: rgba(37, 99, 235, 0.3);
    --scroll-prompt: #94a3b8;
}

body.dark-mode {
    /* Dark Mode Variables */
    --text: #e2e8f0;
    --text-light: #94a3b8;
    --bg: #0f172a;
    --bg-gradient: linear-gradient(135deg, #0c1a2d 0%, #0d2139 100%);
    --card-bg: rgba(15, 23, 42, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --hero-text-gradient: linear-gradient(to right, #e2e8f0, #a3c1ff);
    --stat-gradient: linear-gradient(to right, #818cf8, #ec4899);
    --badge-bg: rgba(37, 99, 235, 0.25);
    --badge-text: #a3c1ff;
    --btn-outline-bg: rgba(255, 255, 255, 0.1);
    --btn-outline-border: rgba(255, 255, 255, 0.2);
    --scroll-prompt: #cbd5e1;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--lighter);
    overflow-x: hidden;
    background: var(--bg-gradient);
    padding-top: 100px; /* Prevent content under fixed header */
}

body.dark-mode {
    background-color: var(--darker);
    color: #e2e8f0;
}

/* Typography */
h1, h2, h3, h4, h5 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

/* Layout Structure */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}

.section-title h2 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
}

.section-title p {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 700px;
    margin: 30px auto 0;
}

body.dark-mode .section-title p {
    color: #94a3b8;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1001;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

body.dark-mode header {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 6px;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.03);
}

.logo-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

.logo-icon img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
}

.logo-text {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.8rem;
}

body.dark-mode .logo-text .zeno {
    color: #e2e8f0;
}

.logo-text .launch {
    color: var(--primary);
    font-weight: 700;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 35px;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    font-size: 1.05rem;
}

body.dark-mode .nav-links a {
    color: #e2e8f0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    font-size: 1.8rem;
    cursor: pointer;
    z-index: 1002;
    color: var(--dark);
}

body.dark-mode .menu-toggle {
    color: white;
}

/* Theme Toggle */
.theme-toggle-container {
    display: flex;
    align-items: center;
}

.theme-toggle {
    width: 60px;
    height: 30px;
    background: rgba(37, 99, 235, 0.2);
    border-radius: 50px;
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 0 5px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
}

body.dark-mode .theme-toggle {
    background: rgba(37, 99, 235, 0.3);
}

.toggle-switch {
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    left: 4px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

body.dark-mode .toggle-switch {
    background: #1e293b;
    transform: translateX(30px);
}

.toggle-icon {
    font-size: 0.9rem;
    color: #FFA500;
    transition: opacity 0.3s ease;
}

body.dark-mode .toggle-icon {
    color: #FFD700;
}

.sun-icon {
    position: absolute;
    left: 7px;
}

.moon-icon {
    position: absolute;
    right: 7px;
    opacity: 0.7;
}

body.dark-mode .sun-icon {
    opacity: 0.7;
}

body.dark-mode .moon-icon {
    opacity: 1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 16px 38px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 1.1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    z-index: 1;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.btn-outline {
    background: var(--btn-outline-bg);
    color: var(--text);
    border: 2px solid var(--btn-outline-border);
    backdrop-filter: blur(10px);
}

.dark-mode .btn-outline {
    color: white;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.btn i {
    margin-left: 10px;
    transition: transform 0.3s ease;
}

.btn:hover i {
    transform: translateX(5px);
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 50px;
    margin-bottom: 60px;
}

.footer-column h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 15px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--primary);
}

.footer-column p {
    margin-bottom: 20px;
    color: #94a3b8;
    font-size: 1.1rem;
}

.footer-column a {
    color: #94a3b8;
    text-decoration: none;
    transition: var(--transition);
    display: block;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.footer-column a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-column form {
    display: flex;
    flex-direction: column;
}

.footer-column input {
    padding: 16px;
    border: none;
    border-radius: 12px;
    margin-bottom: 15px;
    font-family: inherit;
    font-size: 1.1rem;
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #334155;
    color: #94a3b8;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.copyright-links a {
    color: #94a3b8;
    text-decoration: none;
    margin-left: 25px;
    transition: var(--transition);
}

.copyright-links a:hover {
    color: white;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

/* Responsive Design */
@media (max-width: 992px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--lighter);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 30px 30px;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        transition: var(--transition);
        z-index: 1000;
    }
    
    body.dark-mode .nav-links {
        background: var(--darker);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        margin: 0 0 25px 0;
        width: 100%;
    }
    
    .nav-links a {
        font-size: 1.2rem;
        padding: 10px 0;
        display: block;
        width: 100%;
    }
    
    .theme-toggle-container {
        margin-top: 20px;
    }
    
    .menu-toggle {
        display: block;
        z-index: 1002;
    }
}

@media (max-width: 768px) {
    .logo-icon {
        display: none;
    }
    
    .section-title h2 {
        font-size: 2.2rem;
    }
    
    section {
        padding: 70px 0;
    }
    
    .footer-content {
        gap: 30px;
    }
    
    .copyright {
        flex-direction: column;
        align-items: center;
    }
    
    .copyright-links {
        margin-top: 15px;
    }
    
    .copyright-links a {
        margin: 0 10px;
    }
}

@media (max-width: 480px) {
    .section-title h2 {
        font-size: 1.8rem;
    }
    
    .section-title p {
        font-size: 1rem;
    }
    
    .btn {
        padding: 14px 30px;
        font-size: 1rem;
    }
}