/* Monochrome Professional Theme */
:root {
    --color-background: #ffffff;
    --color-background-alt: #f8f8f8;
    --color-text: #1a1a1a;
    --color-muted: #555555;
    --color-border: #e1e1e1;
    --color-hover: #000000;
}

/* Import clean, professional font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

/* Global Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-background-alt);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Links */
a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

/* Header */
header {
    background: var(--color-background);
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

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

.header-logo {
    height: 40px;
    width: auto;
}

header nav a {
    font-weight: 600;
    margin-left: 2rem;
    position: relative;
    padding-bottom: 0.25rem;
}

header nav a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--color-text);
    transition: width 0.3s ease;
}

header nav a:hover::after {
    width: 100%;
}

/* Hero Section */
#hero {
    background: var(--color-background);
    padding: 4rem 0;
}

#hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

#hero .text {
    flex: 1;
}

#hero h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

#hero p {
    font-size: 1.125rem;
    color: var(--color-muted);
    margin-bottom: 2rem;
    max-width: 600px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-text);
    color: var(--color-background);
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.cta-button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.cta-button img {
    height: 1.25rem;
    width: auto;
    margin-right: 0.75rem;
}

@media (max-width: 768px) {
    #hero .container {
        flex-direction: column;
        text-align: center;
    }
}

/* Sections */
section {
    padding: 4rem 0;
}

section:nth-of-type(even) {
    background: var(--color-background-alt);
}

section h2 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: inline-block;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 0.5rem;
}

section p {
    font-size: 1rem;
    color: var(--color-muted);
    margin-bottom: 2rem;
    max-width: 700px;
}

/* Features Grid */
.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
}

.feature-item {
    background: var(--color-background);
    padding: 2rem;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.feature-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-item p {
    font-size: 1rem;
    color: var(--color-muted);
}

/* Lists */
ul {
    list-style: none;
    padding-left: 0;
    max-width: 700px;
    margin: 1rem 0;
}

ul li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    color: var(--color-muted);
}

ul li::before {
    content: '\2013';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-text);
    font-size: 1rem;
}

/* Footer */
footer {
    background: var(--color-background);
    text-align: center;
    padding: 3rem 0;
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-muted);
}

footer a {
    margin: 0 0.5rem;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

footer a:hover {
    opacity: 1;
    text-decoration: underline;
}

.in-app-purchases {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--color-muted);
}