/* ===== CSS Variables ===== */
:root {
    /* Modern color palette - no gradients */
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: #e0e7ff;
    --color-secondary: #0ea5e9;
    --color-accent: #f97316;
    --color-success: #22c55e;

    /* Neutrals */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Text colors */
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

/* ===== Page Hero & Content Styles ===== */
.page-hero {
    background-color: var(--color-primary);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.page-hero h1 {
    color: #ffffff;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.page-hero p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.125rem;
}

.page-content {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.content-wrapper h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
}

.content-wrapper h2:first-child {
    margin-top: 0;
}

.content-wrapper p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.content-wrapper ul {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-xl);
}

.content-wrapper ul li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.content-wrapper a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.content-wrapper a:hover {
    text-decoration: underline;
}

.cta-box {
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.cta-box h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.cta-box p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Contact Page Styles */
.contact-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.contact-methods {
    display: grid;
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.contact-method {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
}

.contact-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
}

.contact-method h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-method p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin: 0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Container ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== Header ===== */
.header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text-primary);
    text-decoration: none;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

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

/* ===== Tool Section ===== */
.tool-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.tool-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    max-width: 700px;
    margin: 0 auto;
}

.tool-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.tool-header h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.tool-header p {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background-color: var(--color-bg);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card.highlight {
    background-color: var(--color-primary);
}

.stat-card.highlight .stat-icon,
.stat-card.highlight .stat-value,
.stat-card.highlight .stat-label {
    color: #ffffff;
}

.stat-icon {
    width: 24px;
    height: 24px;
    margin: 0 auto var(--spacing-sm);
    color: var(--color-primary);
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

/* Click Area */
.click-area {
    background-color: var(--color-bg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
    user-select: none;
}

.click-area:hover,
.click-area:focus {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.click-area:active,
.click-area.active {
    transform: scale(0.98);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.click-area:active .spacebar-icon,
.click-area.active .spacebar-icon,
.click-area:active .click-instruction,
.click-area.active .click-instruction {
    color: #ffffff;
}

.spacebar-visual {
    margin-bottom: var(--spacing-md);
}

.spacebar-icon {
    width: 180px;
    height: 60px;
    color: var(--color-text-secondary);
    transition: color var(--transition-base);
}

.click-instruction {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-base);
}

.click-instruction kbd {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.125rem 0.5rem;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* Controls */
.controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: inherit;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--color-border-light);
    border-color: var(--color-text-muted);
}

/* ===== Content Sections ===== */
.content-section,
.features-section,
.faq-section {
    padding: var(--spacing-3xl) 0;
}

.content-section {
    background-color: var(--color-surface);
}

.features-section {
    background-color: var(--color-bg);
}

.faq-section {
    background-color: var(--color-surface);
}

.section-title {
    font-size: 1.75rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--color-text-primary);
}

/* Steps Grid */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.step-card {
    text-align: center;
    padding: var(--spacing-xl);
    position: relative;
}

.step-number {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 32px;
    background-color: var(--color-primary);
    color: #ffffff;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}

.step-icon {
    width: 48px;
    height: 48px;
    margin: var(--spacing-xl) auto var(--spacing-md);
    color: var(--color-secondary);
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.step-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 40px;
    height: 40px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.feature-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* FAQ Grid */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-lg);
}

.faq-item {
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
}

.faq-item h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.faq-item p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ===== Section Subtitle ===== */
.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.0625rem;
    max-width: 600px;
    margin: -1.5rem auto var(--spacing-2xl);
    line-height: 1.6;
}

/* ===== Info Section ===== */
.info-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

.info-content {
    max-width: 800px;
    margin: 0 auto;
}

.info-content h2 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.info-content p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.info-content p:last-child {
    margin-bottom: 0;
}

.info-content strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ===== CPS Section ===== */
.cps-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.cps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.cps-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    border-top: 4px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.cps-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.cps-card.cps-beginner {
    border-top-color: #94a3b8;
}

.cps-card.cps-average {
    border-top-color: #22c55e;
}

.cps-card.cps-fast {
    border-top-color: #0ea5e9;
}

.cps-card.cps-pro {
    border-top-color: #8b5cf6;
}

.cps-card.cps-elite {
    border-top-color: #f97316;
}

.cps-range {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.cps-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.cps-card p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* ===== Tips Section ===== */
.tips-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-lg);
}

.tip-card {
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    position: relative;
    padding-left: calc(var(--spacing-xl) + 60px);
}

.tip-number {
    position: absolute;
    left: var(--spacing-xl);
    top: var(--spacing-xl);
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary-light);
    line-height: 1;
}

.tip-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.tip-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ===== Use Cases Section ===== */
.usecases-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.usecases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.usecase-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.usecase-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.usecase-icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.usecase-icon svg {
    width: 24px;
    height: 24px;
}

.usecase-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.usecase-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
}

/* ===== Games Section ===== */
.games-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-surface);
}

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

.game-card {
    background-color: var(--color-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.game-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.game-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.game-card h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.game-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* ===== About Section ===== */
.about-section {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ===== Footer ===== */
.footer {
    background-color: var(--color-text-primary);
    color: #ffffff;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-brand .logo {
    margin-bottom: var(--spacing-md);
    color: #ffffff;
}

.footer-brand .logo-icon {
    color: var(--color-primary-light);
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    max-width: 300px;
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-muted);
}

.footer-links a {
    display: block;
    color: #ffffff;
    text-decoration: none;
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header .container {
        height: 56px;
    }

    .nav {
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 0.875rem;
    }

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

    .tool-card {
        padding: var(--spacing-lg);
        border-radius: var(--radius-xl);
    }

    .tool-header h1 {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }

    .stat-card {
        padding: var(--spacing-md);
    }

    .stat-value {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.6875rem;
    }

    .click-area {
        padding: var(--spacing-xl);
    }

    .spacebar-icon {
        width: 140px;
        height: 48px;
    }

    .controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .tips-grid {
        grid-template-columns: 1fr;
    }

    .tip-card {
        padding-left: var(--spacing-xl);
    }

    .tip-number {
        position: relative;
        left: 0;
        top: 0;
        margin-bottom: var(--spacing-sm);
    }

    .cps-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .games-grid {
        grid-template-columns: 1fr;
    }

    .section-subtitle {
        font-size: 0.9375rem;
        margin: -1rem auto var(--spacing-xl);
    }

    .info-content h2,
    .about-content h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo span {
        font-size: 1rem;
    }

    .nav-link {
        font-size: 0.8125rem;
    }

    .nav {
        gap: var(--spacing-sm);
    }
}