:root {
    --bg-color: #050505;
    --card-bg: #111111;
    --text-primary: #e0e0e0;
    --text-secondary: #888888;
    --accent-green: #00ff41;
    --accent-red: #ff3333;
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
}

h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 700;
}

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

/* Header */
.header {
    padding: 20px 0;
    border-bottom: 1px solid #222;
    position: sticky;
    top: 0;
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

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

.logo {
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.nav a:hover {
    color: var(--accent-green);
}

/* Hero */
.hero {
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 20px;
}

.highlight {
    color: transparent;
    -webkit-text-stroke: 1px var(--accent-green);
    position: relative;
}

.highlight::after {
    content: "未来";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-green);
    opacity: 0.2;
    filter: blur(5px);
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-image-placeholder {
    margin-top: 40px;
}

.mockup-window {
    background: #1a1a1a;
    border-radius: 8px;
    box-shadow: 0 20px 50px rgba(0, 255, 65, 0.1);
    border: 1px solid #333;
    overflow: hidden;
}

.mockup-header {
    background: #2a2a2a;
    padding: 10px 15px;
    display: flex;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red {
    background: #ff5f56;
}

.yellow {
    background: #ffbd2e;
}

.green {
    background: #27c93f;
}

.app-img {
    width: 100%;
    display: block;
    opacity: 0.8;
}

/* Buttons */
.btn {
    padding: 12px 30px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--accent-green);
    color: #000;
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

.btn-primary:hover {
    background: #fff;
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.6);
}

.btn-secondary {
    background: #222;
    color: #fff;
    border: 1px solid #333;
}

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

.btn-outline:hover {
    border-color: var(--text-primary);
}

.full-width {
    display: block;
    text-align: center;
    width: 100%;
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 50px;
    font-size: 1.2rem;
}

.text-red {
    color: var(--accent-red);
}

/* Problem */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.problem-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid #222;
}

.icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

/* Features */
.features {
    background: linear-gradient(180deg, var(--bg-color) 0%, #0a110a 100%);
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 50px;
    margin-bottom: 100px;
}

.feature-row.reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-text h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--accent-green);
}

.feature-visual {
    flex: 1;
}

.visual-box {
    background: #111;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #333;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
}

.feature-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.visual-box:hover .feature-img {
    transform: scale(1.05);
}

/* Pricing */
.pricing-grid {
    display: flex;
    justify-content: center;
    gap: 40px;
    align-items: stretch;
    flex-wrap: wrap;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid #333;
    border-radius: 12px;
    padding: 40px;
    flex: 1;
    min-width: 300px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.pro {
    border: 1px solid var(--accent-green);
    box-shadow: 0 0 30px rgba(0, 255, 65, 0.05);
    transform: scale(1.05);
}

.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-green);
    color: #000;
    padding: 5px 15px;
    font-size: 0.8rem;
    font-weight: bold;
    border-radius: 20px;
}

.plan-name {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.price {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 5px;
    /* Reduced for price-per-tweet */
}

.price-per-tweet {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-weight: bold;
}

.price-per-tweet.highlight-green {
    color: var(--accent-green);
}

.currency {
    font-size: 1.5rem;
    vertical-align: top;
}

.period {
    font-size: 1rem;
    font-weight: normal;
    color: var(--text-secondary);
}

.plan-desc {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.plan-features {
    list-style: none;
    margin-bottom: 40px;
    flex-grow: 1;
}

.plan-features li {
    margin-bottom: 15px;
    border-bottom: 1px solid #222;
    padding-bottom: 15px;
}

.plan-note {
    font-size: 0.8rem;
    color: #666;
    margin-top: -10px;
    margin-bottom: 20px;
    line-height: 1.4;
}

/* Footer */
.footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid #222;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 900px) {
    .pricing-grid {
        flex-direction: column;
        align-items: center;
    }

    .pricing-card {
        width: 100%;
        max-width: 400px;
        flex: none;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .feature-row {
        flex-direction: column;
    }

    .feature-row.reverse {
        flex-direction: column;
    }

    .pricing-card.pro {
        transform: scale(1);
    }
}