/* Custom Modern CSS Variables */
:root {
    --bg-dark: #070a13;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(31, 41, 55, 0.8);
    --primary: #6366f1;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --secondary: #a855f7;
    --accent-gold: #f59e0b;
    --accent-gold-glow: rgba(245, 158, 11, 0.3);
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-title: #ffffff;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --glass-shine: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
    --transition-speed: 0.3s;
    --btn-outline-bg: rgba(255, 255, 255, 0.03);
    --btn-outline-hover-bg: rgba(255, 255, 255, 0.08);
    --header-bg: rgba(7, 10, 19, 0.7);
    --pricing-bg: rgba(17, 24, 39, 0.4);
    --footer-bg: rgba(7, 10, 19, 0.9);
}

/* Light Theme Variables */
body.light-theme {
    --bg-dark: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #ffffff;
    --primary: #4f46e5;
    --primary-glow: rgba(79, 70, 229, 0.2);
    --secondary: #7c3aed;
    --accent-gold: #d97706;
    --accent-gold-glow: rgba(217, 119, 6, 0.15);
    --text-primary: #020617;
    --text-secondary: #1e293b;
    --text-muted: #475569;
    --text-title: #000000;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);
    --glass-shine: transparent;
    --btn-outline-bg: rgba(0, 0, 0, 0.03);
    --btn-outline-hover-bg: rgba(0, 0, 0, 0.06);
    --header-bg: rgba(248, 250, 252, 0.8);
    --pricing-bg: rgba(226, 232, 240, 0.4);
    --footer-bg: #f1f5f9;
}

body.light-theme .blob {
    opacity: 0.08;
}

body.light-theme .modal-content {
    background-color: #ffffff;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15), 0 0 30px rgba(79, 70, 229, 0.05);
}

body.light-theme .feature-card h3,
body.light-theme .plan-name {
    color: #000000;
}

/* Basic Reset & Typography */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

h1,
h2,
h3,
h4 {
    font-family: 'Outfit', sans-serif;
    color: var(--text-title);
    font-weight: 700;
}

/* Animated Ambient Background Gradients */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    animation: float-blob 20s infinite alternate ease-in-out;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, var(--primary) 0%, transparent 80%);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--secondary) 0%, transparent 80%);
    animation-delay: -5s;
}

.blob-3 {
    top: 40%;
    left: 35%;
    width: 35vw;
    height: 35vw;
    background: radial-gradient(circle, var(--accent-gold) 0%, transparent 80%);
    opacity: 0.08;
    animation-duration: 25s;
}

@keyframes float-blob {
    0% {
        transform: translate(0, 0) scale(1);
    }

    50% {
        transform: translate(5%, 10%) scale(1.1);
    }

    100% {
        transform: translate(-5%, -5%) scale(0.95);
    }
}

/* Header Navigation */
header {
    width: 100%;
    position: sticky;
    top: 0;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    background-color: var(--header-bg);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

header.header-hidden {
    transform: translateY(-100%);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--primary-glow);
}

.logo-icon i {
    color: #ffffff;
    font-size: 1.25rem;
}

.logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-title) 30%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-speed);
}

.nav-links a:hover {
    color: var(--text-title);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all var(--transition-speed);
    cursor: pointer;
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    background: var(--btn-outline-bg);
}

.btn-outline:hover {
    background: var(--btn-outline-hover-bg);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    box-shadow: 0 4px 20px var(--primary-glow);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.6);
}

/* Container & Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0 4rem;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.badge-premium {
    align-self: flex-start;
    padding: 0.35rem 0.85rem;
    border-radius: 9999px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: #818cf8;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.hero-title span {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 540px;
}

/* Hero Highlights List */
.hero-highlights {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 0.5rem 0 1rem;
    text-align: left;
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 1.05rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.highlight-icon {
    font-size: 1.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    margin-top: -1px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

/* Hero Phone Mockup Rendered with Pure HTML & CSS */
.hero-preview {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.phone-container {
    width: 290px;
    height: 580px;
    background-color: #000000;
    border-radius: 40px;
    padding: 10px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8),
        0 0 40px rgba(99, 102, 241, 0.15);
    border: 4px solid #1f2937;
    position: relative;
    animation: phone-float 6s infinite alternate ease-in-out;
}

@keyframes phone-float {
    0% {
        transform: translateY(0) rotate(0);
    }

    100% {
        transform: translateY(-15px) rotate(1deg);
    }
}

.phone-speaker {
    width: 60px;
    height: 15px;
    background-color: #1f2937;
    border-radius: 9999px;
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background-color: #090c15;
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border: 1px solid #111827;
    padding: 2.2rem 0.8rem 1rem;
    font-size: 0.8rem;
    /* Prevent phone mock variables from changing in light mode */
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --primary: #6366f1;
}

/* Inner Phone Mock UI */
.mock-app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0.5rem;
}

.mock-app-header .app-logo {
    font-weight: 800;
    color: #ffffff;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

.mock-app-header .app-logo i {
    color: var(--secondary);
}

.mock-app-header .app-coins {
    color: var(--accent-gold);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
}

.mock-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 0.75rem;
    margin-bottom: 0.8rem;
}

.mock-card-title {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.mock-question {
    color: #ffffff;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.mock-options {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.mock-option {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-size: 0.7rem;
    border: 1px solid transparent;
    cursor: pointer;
}

.mock-option.correct {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.mock-leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.mock-leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    padding: 0.35rem 0.5rem;
    border-radius: 6px;
}

.mock-leaderboard-item .user-info {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.mock-leaderboard-item .rank {
    font-weight: 700;
    width: 14px;
    color: var(--text-secondary);
}

.mock-leaderboard-item .rank-1 {
    color: var(--accent-gold);
}

.mock-leaderboard-item .name {
    color: #ffffff;
    font-weight: 500;
}

.mock-leaderboard-item .score {
    font-weight: 600;
    color: var(--primary);
}

/* Features Section */
.features {
    padding: 6rem 0;
    border-top: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.section-title {
    font-size: 2.5rem;
    line-height: 1.2;
    color: var(--text-title);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--glass-shine);
    z-index: 1;
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feature-card:nth-child(2) .feature-icon {
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.2);
    color: var(--secondary);
}

.feature-card:nth-child(3) .feature-icon {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    color: var(--accent-gold);
}

.feature-card h3 {
    font-size: 1.35rem;
    color: var(--text-title);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Pricing Section */
.pricing {
    padding: 6rem 0;
    background: var(--pricing-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-speed);
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--glass-shine);
    pointer-events: none;
}

.pricing-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.pricing-card.premium {
    border: 2px solid var(--accent-gold);
    box-shadow: 0 10px 30px var(--accent-gold-glow);
}

.pricing-card.premium:hover {
    box-shadow: 0 15px 40px rgba(245, 158, 11, 0.4);
}

.popular-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #d97706 100%);
    color: #000000;
    padding: 0.35rem 0.85rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.plan-name {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-title);
}

.plan-price-container {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
}

.plan-currency {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-title);
}

.plan-price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-title);
    font-family: 'Outfit', sans-serif;
}

.plan-duration {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-left: 0.25rem;
}

.plan-features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-grow: 1;
}

.plan-features-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.plan-features-list li i {
    color: var(--primary);
    font-size: 1.1rem;
}

.pricing-card.premium .plan-features-list li i {
    color: var(--accent-gold);
}

.pricing-card.premium .btn-pricing {
    background: linear-gradient(135deg, var(--accent-gold) 0%, #d97706 100%);
    color: #000000;
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.pricing-card.premium .btn-pricing:hover {
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
}

.btn-pricing {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border-radius: 12px;
}

/* FAQ Section */
.faq {
    padding: 6rem 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-speed);
}

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

.faq-question-btn {
    width: 100%;
    padding: 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-title);
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question-btn i {
    transition: transform var(--transition-speed);
    color: var(--text-secondary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed) ease-out;
    background: rgba(255, 255, 255, 0.01);
}

.faq-answer-content {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.faq-item.active .faq-question-btn i {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* Footer & Modals Trigger Links */
footer {
    padding: 4rem 0 2rem;
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.2fr;
    gap: 3rem;
    margin-bottom: 3rem;
    align-items: start;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 320px;
}

.footer-links-col {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links-col h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.footer-links-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links-list a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-speed);
}

.footer-links-list a:hover {
    color: var(--text-title);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
}

.footer-bottom-links button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    transition: color var(--transition-speed);
}

.footer-bottom-links button:hover {
    color: var(--text-title);
}

/* Play Store Badges */
.playstore-badge {
    display: inline-flex;
    align-items: center;
    height: 48px;
    transition: transform var(--transition-speed);
}

.playstore-badge:hover {
    transform: scale(1.05);
}

.playstore-badge img {
    height: 100%;
    border-radius: 5px;
    object-fit: contain;
}

/* Modal Overlay System */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(7, 10, 19, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 2rem;
}

.modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: #0b0f19;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    width: 100%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    padding: 3rem;
    position: relative;
    transform: translateY(40px) scale(0.92);
    opacity: 0;
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 30px rgba(99, 102, 241, 0.1);
}

.modal.active .modal-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}


.modal-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--btn-outline-bg);
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
}

.modal-close-btn:hover {
    background: var(--btn-outline-hover-bg);
    color: var(--text-title);
}

.modal-title {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.modal-body {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.modal-body h3, .modal-body h4 {
    color: var(--text-title) !important;
}

.modal-body h3 {
    font-size: 1.25rem;
    margin-top: 1rem;
}

.modal-body ul {
    list-style-position: inside;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-left: 1rem;
}

/* Responsive Breakpoints */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
        padding: 4rem 0;
        align-items: center;
    }

    .hero-content {
        align-items: center;
    }

    .hero-desc {
        max-width: 100%;
    }

    .hero-highlights {
        align-self: center;
        max-width: 500px;
        width: 100%;
        padding: 0 1rem;
    }

    .hero-actions {
        justify-content: center;
        flex-wrap: wrap;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 640px) {
    .header-container {
        padding: 1rem 1.5rem;
    }

    .nav-links {
        display: flex;
        gap: 1rem;
    }

    .nav-item-link {
        display: none;
    }

    .nav-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .pricing-card {
        padding: 2rem 1.5rem;
    }

    .modal-content {
        padding: 2rem 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Scroll to Top Button */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4), 0 0 15px var(--primary-glow);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
                visibility 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
                box-shadow 0.3s ease;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-top-btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 30px rgba(168, 85, 247, 0.6), 0 0 20px rgba(168, 85, 247, 0.4);
    background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
}

.scroll-top-btn i {
    transition: transform 0.3s ease;
}

.scroll-top-btn:hover i {
    transform: translateY(-2px);
}

@media (max-width: 640px) {
    .scroll-top-btn {
        bottom: 1.5rem;
        right: 1.5rem;
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
}

/* Theme Toggle Button Styling */
.theme-toggle-btn {
    background: var(--btn-outline-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-speed);
}

.theme-toggle-btn:hover {
    background: var(--btn-outline-hover-bg);
    border-color: var(--border-hover);
    transform: scale(1.05);
}

/* Theme Toggle Transitions for smoothness */
header, .feature-card, .pricing-card, .faq-item, footer, .modal-content, .nav-links a, .theme-toggle-btn, .modal-close-btn, .logo-text {
    transition: background-color var(--transition-speed), border-color var(--transition-speed), color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
}

/* Light Theme Card Shadow & Typography Enhancements */
body.light-theme .feature-card,
body.light-theme .pricing-card {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

body.light-theme .feature-card:hover,
body.light-theme .pricing-card:hover {
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

body.light-theme .feature-card p,
body.light-theme .plan-features-list li {
    color: var(--text-secondary);
    font-weight: 500;
}