/* Base Styles */
:root {
    --google-blue: #4285F4;
    --google-red: #DB4437;
    --google-yellow: #F4B400;
    --google-green: #0F9D58;
    --white: #ffffff;
    --light-gray: #f5f5f5;
    --dark-gray: #333333;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--google-blue);
    display: inline-block;
}

.nav {
    display: flex;
    align-items: center;
}

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

.nav li {
    margin-left: 20px;
}

.nav-link {
    text-decoration: none;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--google-blue);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--google-blue);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

/* Dark Mode Toggle Button */
.dark-mode-toggle {
    background: none;
    border: none;
    color: var(--dark-gray);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 20px;
    transition: var(--transition);
    padding: 5px;
}

.dark-mode-toggle:hover {
    color: var(--google-blue);
    transform: scale(1.1);
}

.dark-mode-toggle i.fa-sun {
    display: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.1) 0%, rgba(219, 68, 55, 0.1) 50%, rgba(244, 180, 0, 0.1) 100%);
    transition: var(--transition);
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--google-blue);
    animation: fadeIn 1s ease-in-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 40px;
    color: var(--dark-gray);
    animation: fadeIn 1s ease-in-out 0.3s forwards;
    opacity: 0;
    transition: var(--transition);
}

.qr-code-main {
    margin: 30px auto;
    padding: 20px;
    background-color: var(--white);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    max-width: 250px;
    animation: fadeInUp 1s ease-in-out 0.6s forwards;
    opacity: 0;
    transition: var(--transition);
}

.qr-image {
    width: 100%;
    height: auto;
    display: block;
}

/* Section Styles */
.section {
    padding: 80px 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
    transition: var(--transition);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--google-blue), var(--google-red), var(--google-yellow), var(--google-green));
    background-size: 300% 100%;
    border-radius: 2px;
    animation: gradientBG 3s ease infinite;
}

/* Prompts Grid */
.prompts-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-top: 30px;
}

.prompt-card {
    background-color: var(--white);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.prompt-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.prompt-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--google-blue);
    text-align: center;
    transition: var(--transition);
}

.qr-code-small {
    margin: 20px auto;
    max-width: 150px;
}

.scan-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: var(--google-blue);
    color: var(--white);
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 20px;
}

.scan-btn:hover {
    background-color: var(--google-green);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Coming Soon Section */
.coming-soon-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-top: 30px;
}

.coming-soon-card {
    background-color: var(--light-gray);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.coming-soon-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.coming-soon-card i {
    font-size: 2.5rem;
    color: var(--google-red);
    margin-bottom: 20px;
    transition: var(--transition);
}

.coming-soon-card p {
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--google-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    background-color: var(--google-red);
    transform: translateY(-5px);
}

/* Footer */
.footer {
    background-color: var(--dark-gray);
    color: var(--white);
    padding: 30px 0;
    text-align: center;
    transition: var(--transition);
}

.footer-text {
    margin-bottom: 15px;
    font-size: 1rem;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.social-icons a {
    color: var(--white);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-icons a:hover {
    color: var(--google-yellow);
    transform: translateY(-3px);
}

/* Dark Mode Styles */
body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

.dark-mode .header {
    background-color: #1e1e1e;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.dark-mode .nav-link {
    color: #e0e0e0;
}

.dark-mode .nav-link:hover {
    color: var(--google-blue);
}

.dark-mode .hero {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.2) 0%, rgba(219, 68, 55, 0.2) 50%, rgba(244, 180, 0, 0.2) 100%);
}

.dark-mode .hero-subtitle {
    color: #e0e0e0;
}

.dark-mode .prompt-card,
.dark-mode .coming-soon-card,
.dark-mode .qr-code-main {
    background-color: #1e1e1e;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    color: #e0e0e0;
}

.dark-mode .coming-soon-card {
    background-color: #2d2d2d;
}

.dark-mode .footer {
    background-color: #1e1e1e;
}

.dark-mode .dark-mode-toggle {
    color: var(--google-yellow);
}

.dark-mode .dark-mode-toggle i.fa-moon {
    display: none;
}

.dark-mode .dark-mode-toggle i.fa-sun {
    display: inline-block;
}

.dark-mode .prompt-title {
    color: var(--google-blue);
}

.dark-mode .coming-soon-card i {
    color: var(--google-red);
}

.dark-mode .coming-soon-card p {
    color: #e0e0e0;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive Styles */
@media (min-width: 768px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-subtitle {
        font-size: 2rem;
    }
    
    .prompts-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .coming-soon-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .prompts-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .coming-soon-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}