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

body {
    font-family: 'Hiragino Sans', 'Yu Gothic', 'Noto Sans JP', sans-serif;
    line-height: 1.8;
    color: #5a5a5a;
    background: linear-gradient(135deg, #e0f7fa 0%, #bbdefb 100%);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 80%, rgba(77, 208, 225, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(0, 188, 212, 0.2) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

/* ========== HEADER & LOGO ========== */
header {
    padding: 2rem 0;
    text-align: center;
}

.logo {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
    background: linear-gradient(45deg, #4DD0E1, #26C6DA, #00BCD4, #00ACC1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    /* text-shadow: 0 0 30px rgba(0, 188, 212, 0.5); */
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.logo-sub {
    display: block;
    font-size: 1.2rem;
    font-weight: 400;
    color: rgba(0, 172, 193, 0.8);
    margin-top: -0.5rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 16px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 188, 212, 0.2);
    display: inline-block;
    transform: scale(0.85);
    margin-top: -10px;
}

/* ========== HERO SECTION ========== */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 30px;
    margin: 3rem 0;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1),
                0 8px 16px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.05) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero h1, .hero h2 {
    font-size: 1.8rem;
    background: linear-gradient(45deg, #00BCD4, #4DD0E1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    font-weight: 700;
    position: relative;
    z-index: 2;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    color: #666;
    font-weight: 500;
    position: relative;
    z-index: 2;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #00BCD4 0%, #4DD0E1 100%);
    color: white;
    padding: 1.2rem 3rem;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.3rem;
    font-weight: 600;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 30px rgba(0, 188, 212, 0.4);
    position: relative;
    z-index: 2;
    border: 2px solid transparent;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 35px rgba(0, 188, 212, 0.6);
    border-color: rgba(255, 255, 255, 0.5);
}

.cta-note {
    font-size: 0.8rem!important;
    color: gray!important;
    margin-top: 1rem;
    text-align: center;
    position: relative;
    z-index: 2;
    font-style: italic;
}

/* ========== SECTION TITLES ========== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    background: linear-gradient(45deg, #00BCD4, #4DD0E1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    font-weight: 700;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(45deg, #00BCD4, #4DD0E1);
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: #6b7280;
    margin-bottom: 3rem;
    font-size: 1.1rem;
    font-weight: 500;
}

/* ========== CONCEPT SECTION ========== */
.concept {
    padding: 4rem 0;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 25px;
    margin: 3rem 0;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.concept-points {
    max-width: 800px;
    margin: 2rem auto;
    list-style: none;
    padding: 0;
}

.concept-points li {
    background: rgba(0, 188, 212, 0.1);
    margin: 1rem 0;
    padding: 1.5rem 2rem;
    border-radius: 15px;
    border-left: 5px solid #00BCD4;
    color: #555;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
}

.concept-points li:hover {
    transform: translateX(10px);
    box-shadow: 0 8px 25px rgba(0, 188, 212, 0.2);
}

.concept-points li::before {
    content: "✨";
    position: absolute;
    left: -15px;
    top: 50%;
    transform: translateY(-50%);
    background: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

/* ========== EMOTIONAL LINE ========== */
.emotional-line {
    text-align: center;
    margin: 4rem 0;
    padding: 2rem 2rem;
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.9), rgba(77, 208, 225, 0.9));
    border-radius: 25px;
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.emotional-line::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #00BCD4, #4DD0E1, #00BCD4);
    border-radius: 25px;
    z-index: -1;
    animation: borderGlow 3s linear infinite;
}

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

.emotional-line p {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.3);
    margin: 0;
    position: relative;
    z-index: 1;
    letter-spacing: 0.5px;
    line-height: 2rem;
}

.emotional-line p::before,
.emotional-line p::after {
    content: '"';
    font-size: 2.5rem;
    opacity: 0.6;
    vertical-align: -0.2em;
}

/* ========== USE CASES ========== */
/* .use-cases, .long-story {
    padding: 4rem 0;
} */

.story {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 2.5rem;
    margin: 2rem 0;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.story::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, #00BCD4, #4DD0E1);
}

.story:hover {
    transform: translateY(-8px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.story h3 {
    color: #00ACC1;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.story p {
    font-size: 1.1rem;
    color: #555;
    line-height: 1.8;
    font-weight: 400;
}

/* ========== LONG STORY ========== */
.long-story {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.85));
    border-radius: 25px;
    margin: 3rem 0;
    padding: 4rem 2rem;
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    overflow: hidden;
}

.long-story::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 188, 212, 0.05) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.long-story p {
    text-align: center;
    margin-bottom: 2rem;
    color: #555;
    font-size: 1.2rem;
    font-weight: 500;
    line-height: 2;
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.long-story p:last-child {
    font-size: 1.3rem;
    font-weight: 600;
    color: #00BCD4;
    margin-bottom: 0;
}

/* ========== FEATURES ========== */
/* .features {
    padding: 4rem 0;
} */

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 3rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 20px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
    transition: left 0.6s;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-card h3 {
    background: linear-gradient(45deg, #00BCD4, #4DD0E1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
}

.feature-card p {
    color: #5a6c7d;
    font-size: 1rem;
    line-height: 1.6;
    font-weight: 400;
}

/* ========== FOOTER ========== */
footer {
    text-align: center;
    padding: 3rem 0;
    color: rgba(255, 255, 255, 0.8);
    /* border-top: 1px solid rgba(255, 255, 255, 0.2); */
    margin-top: 4rem;
    /* background: rgba(0, 0, 0, 0.1); */
    backdrop-filter: blur(10px);
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    margin: 0 1rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #bbdefb;
    text-decoration: underline;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .logo {
        font-size: 2.5rem;
    }
    
    .logo-sub {
        font-size: 1rem;
        margin-top: 0.5rem;
        transform: scale(0.9);
    }

    .hero h1, .hero h2 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .container {
        padding: 0 15px;
    }

    .story, .long-story p {
        font-size: 0.9rem;
    }

    .cta-note {
        font-size: 0.8rem;
    }

    .emotional-line p {
        font-size: 1.4rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .hero {
        padding: 3rem 1.5rem;
    }

    .story {
        padding: 2rem;
    }

    .long-story {
        padding: 3rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 2rem;
    }
    
    .logo-sub {
        font-size: 0.9rem;
        margin-top: 0.8rem;
        transform: scale(1);
    }

    .emotional-line p {
        font-size: 1.2rem;
    }

    .cta-button {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
}

/* // スマホの時だけ改行させるクラス */
.br-sp {
    display: none;
}

@media (max-width: 600px) {
    .br-sp {
        display: block;
    }
}