/*
  style.css
  - Author: Gemini AI
  - Date: 2024-07-05
  - Description: Stylesheet for Guitar Lesson LP.
*/

/* --- Reset & Base --- */
:root {
    --main-color: #FFA500; /* Orange */
    --accent-color: #FFD700; /* Gold */
    --bg-color: #121212;
    --text-color: #E0E0E0;
    --card-bg-color: #1E1E1E;
    --border-color: #333;
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Noto Sans JP', sans-serif;
    --container-width: 1120px;
    --spacing-unit: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.3;
}

a {
    color: var(--main-color);
    text-decoration: none;
    transition: color 160ms ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Utility --- */
.container {
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
    padding: 0 calc(var(--spacing-unit) * 2);
}

/* --- Hero Section --- */
.hero {
    background: radial-gradient(circle at 20% 80%, rgba(255, 165, 0, 0.1), transparent 40%),
                radial-gradient(circle at 80% 30%, rgba(255, 215, 0, 0.05), transparent 30%);
    padding: calc(var(--spacing-unit) * 10) 0;
}

.hero__container {
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    gap: calc(var(--spacing-unit) * 6);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.hero__content {
    text-align: center;
}

.hero__title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    color: #fff;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.hero__subtitle {
    font-size: clamp(1.1rem, 3vw, 1.25rem);
    margin-bottom: calc(var(--spacing-unit) * 4);
    color: var(--text-color);
}

.hero__cta-button {
    display: inline-block;
    background-color: var(--main-color);
    color: #000;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1.1rem;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 5);
    border-radius: 50px;
    transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
    box-shadow: 0 4px 15px rgba(255, 165, 0, 0.2);
}

.hero__cta-button:hover {
    background-color: var(--accent-color);
    color: #000;
    transform: translateY(-3px);
}

.hero__cta-caption {
    margin-top: calc(var(--spacing-unit) * 1.5);
    font-size: 0.9rem;
    color: #aaa;
}

.hero__image-wrapper {
    max-width: 600px;
    margin: 0 auto;
}

.hero__image {
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* --- Proof Section --- */
.proof {
    padding: calc(var(--spacing-unit) * 8) 0;
    background-color: var(--card-bg-color);
}

.proof__container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.proof__heading {
    font-size: 1.5rem;
    margin-bottom: calc(var(--spacing-unit) * 4);
    color: #fff;
}

.proof__logos {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 4);
}

.proof__logo-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--text-color);
}

.proof__logo-item span {
    font-size: 0.9rem;
    color: #aaa;
}

.proof__logo-item strong {
    font-family: var(--font-primary);
    font-size: 2rem;
    color: var(--main-color);
}

/* --- Benefits Section --- */
.benefits {
    padding: calc(var(--spacing-unit) * 12) 0;
}

.benefits__container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.benefits__heading {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: calc(var(--spacing-unit) * 8);
    color: #fff;
}

.benefits__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.benefit-card {
    background-color: var(--card-bg-color);
    padding: calc(var(--spacing-unit) * 4);
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 160ms ease, box-shadow 160ms ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.benefit-card__icon {
    font-size: 3rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.benefit-card__title {
    font-size: 1.4rem;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    color: #fff;
}

.benefit-card__description {
    font-size: 1rem;
    color: var(--text-color);
}

/* --- Testimonials Section --- */
.testimonials {
    padding: calc(var(--spacing-unit) * 12) 0;
    background-color: var(--card-bg-color);
}

.testimonials__container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.testimonials__heading {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: calc(var(--spacing-unit) * 8);
    color: #fff;
}

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.testimonial-card {
    background-color: var(--bg-color);
    padding: calc(var(--spacing-unit) * 4);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.testimonial-card__text {
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-style: italic;
}

.testimonial-card__author {
    text-align: right;
    font-weight: 700;
    color: var(--main-color);
}

/* --- FAQ Section --- */
.faq {
    padding: calc(var(--spacing-unit) * 12) 0;
}

.faq__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.faq__heading {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: calc(var(--spacing-unit) * 8);
    color: #fff;
}

.faq__item {
    border-bottom: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 3) 0;
}

.faq__item:last-child {
    border-bottom: none;
}

.faq__question {
    font-size: 1.2rem;
    margin-bottom: calc(var(--spacing-unit) * 1);
    color: var(--accent-color);
}

.faq__answer {
    font-size: 1rem;
    color: var(--text-color);
}

/* --- Closing Section --- */
.closing {
    padding: calc(var(--spacing-unit) * 12) 0;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1525201548942-d8732f6617a0?q=80&w=2070&auto=format&fit=crop') no-repeat center center/cover;
    text-align: center;
}

.closing__container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
}

.closing__heading {
    font-size: 2.5rem;
    color: #fff;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.closing__text {
    font-size: 1.1rem;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.closing__offer {
    background-color: rgba(0,0,0,0.5);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 12px;
    margin-bottom: calc(var(--spacing-unit) * 4);
    border: 1px solid var(--main-color);
}

.closing__offer-price {
    font-size: 1.5rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.closing__offer-price strong {
    font-size: 2.5rem;
    color: var(--main-color);
}

.closing__offer-discount {
    color: var(--accent-color);
    font-weight: 700;
}

.closing__cta-button {
    display: inline-block;
    background-color: var(--main-color);
    color: #000;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1.2rem;
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 6);
    border-radius: 50px;
    transition: background-color 160ms ease, color 160ms ease, transform 160ms ease;
    box-shadow: 0 4px 20px rgba(255, 165, 0, 0.3);
}

.closing__cta-button:hover {
    background-color: var(--accent-color);
    color: #000;
    transform: translateY(-3px);
}

.closing__cta-caption {
    margin-top: calc(var(--spacing-unit) * 1.5);
    font-size: 0.9rem;
    color: #ccc;
}

/* --- Footer --- */
.footer {
    padding: calc(var(--spacing-unit) * 4) 0;
    background-color: #000;
    border-top: 1px solid var(--border-color);
}

.footer__container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.footer__nav {
    display: flex;
    gap: calc(var(--spacing-unit) * 3);
}

.footer__link {
    font-size: 0.9rem;
    color: #aaa;
}

.footer__link:hover {
    color: #fff;
}

.footer__copyright {
    font-size: 0.8rem;
    color: #777;
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
    .hero__container {
        grid-template-columns: 1fr 1fr;
        text-align: left;
    }

    .hero__content {
        text-align: left;
    }

    .footer__container {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* --- Dark Mode (Default) --- */
/* This design is dark mode by default. */

/* --- Light Mode (Optional) --- */
@media (prefers-color-scheme: light) {
    :root {
        --bg-color: #F5F5F5;
        --text-color: #333;
        --card-bg-color: #FFFFFF;
        --border-color: #E0E0E0;
    }

    .hero {
        background: none;
    }

    .hero__title, .benefits__heading, .testimonials__heading, .faq__heading, .closing__heading, .benefit-card__title {
        color: #000;
    }

    .testimonial-card {
        background-color: #F9F9F9;
    }

    .footer {
        background-color: #E0E0E0;
        border-top: 1px solid #ccc;
    }

    .footer__link {
        color: #555;
    }

    .footer__copyright {
        color: #555;
    }
}