/* SoundMindAI - Apple-Inspired Design System */

:root {
    /* Colors - Light Mode */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-bg-tertiary: #fbfbfd;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-text-tertiary: #6e6e73;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-border: #d2d2d7;
    --color-card-bg: #ffffff;
    --color-success: #34c759;
    --color-warning: #ff9500;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-hero: clamp(2.5rem, 5vw, 4rem);
    --font-size-h1: clamp(2rem, 4vw, 3rem);
    --font-size-h2: clamp(1.5rem, 3vw, 2rem);
    --font-size-h3: 1.25rem;
    --font-size-body: 1.0625rem;
    --font-size-small: 0.875rem;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --border-radius: 12px;
    --border-radius-lg: 20px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Light Mode Only - Dark mode removed for consistency */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-3xl) 0;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: var(--font-size-h1);
    text-align: center;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: var(--font-size-body);
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-xl);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.nav__logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav__logo svg {
    width: 28px;
    height: 28px;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}

.nav__link {
    font-size: var(--font-size-small);
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.nav__link:hover {
    color: var(--color-accent);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-body);
    font-weight: 500;
    border-radius: 980px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn--primary:hover {
    background-color: var(--color-accent-hover);
    color: #ffffff;
    transform: scale(1.02);
}

.btn--secondary {
    background-color: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn--secondary:hover {
    background-color: var(--color-accent);
    color: #ffffff;
}

.btn--large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Hero Section */
.hero {
    padding-top: calc(52px + var(--space-3xl));
    padding-bottom: var(--space-3xl);
    text-align: center;
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

.hero__tagline {
    font-size: var(--font-size-h3);
    color: var(--color-text-secondary);
    margin-top: var(--space-md);
    margin-bottom: var(--space-xl);
}

.hero__cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
}

.hero__meta {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
}

.hero__meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.feature-card {
    background: var(--color-card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.feature-card__icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-accent), #2563EB);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    color: white;
    font-size: 1.5rem;
}

.feature-card__title {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-sm);
}

.feature-card__description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* BYOK Section */
.byok {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-tertiary) 100%);
}

.byok__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

@media (max-width: 768px) {
    .byok__content {
        grid-template-columns: 1fr;
    }
}

.byok__text h2 {
    font-size: var(--font-size-h1);
    margin-bottom: var(--space-md);
}

.byok__text p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.byok__benefits {
    list-style: none;
}

.byok__benefit {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.byok__benefit-icon {
    color: var(--color-success);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.byok__providers {
    background: var(--color-card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
}

.byok__providers h3 {
    font-size: var(--font-size-h3);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.provider-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.provider {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
}

.provider__icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.75rem;
}

/* Pricing Section */
.pricing {
    text-align: center;
}

.pricing-card {
    max-width: 400px;
    margin: 0 auto;
    background: var(--color-card-bg);
    border-radius: var(--border-radius-lg);
    padding: var(--space-2xl);
    border: 2px solid var(--color-accent);
    box-shadow: var(--shadow-lg);
}

.pricing-card__badge {
    display: inline-block;
    background: var(--color-accent);
    color: white;
    font-size: var(--font-size-small);
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 980px;
    margin-bottom: var(--space-md);
}

.pricing-card__price {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xs);
}

.pricing-card__term {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.pricing-card__features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-xl);
}

.pricing-card__feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.pricing-card__feature:last-child {
    border-bottom: none;
}

.pricing-card__feature-icon {
    color: var(--color-success);
}

.pricing-card__trial {
    margin-top: var(--space-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
}

/* CTA Section */
.cta {
    text-align: center;
    background: linear-gradient(135deg, #1d1d1f 0%, #2d2d2f 100%);
    color: white;
}

.cta .section-title {
    color: white;
}

.cta .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

.cta__contact {
    margin-top: var(--space-xl);
    color: rgba(255, 255, 255, 0.7);
}

.cta__contact a {
    color: white;
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--space-xl) 0;
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer__links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.footer__link {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.footer__link:hover {
    color: var(--color-accent);
}

.footer__copyright {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

/* Requirements Section */
.requirements {
    background: var(--color-bg-secondary);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.requirement {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    background: var(--color-card-bg);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.requirement__icon {
    font-size: 2rem;
}

.requirement__text strong {
    display: block;
    margin-bottom: 0.25rem;
}

.requirement__text span {
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
}

/* Legal Pages */
.legal-page {
    padding-top: calc(52px + var(--space-2xl));
    padding-bottom: var(--space-3xl);
}

.legal-title {
    font-size: var(--font-size-h1);
    margin-bottom: var(--space-sm);
}

.legal-updated {
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    margin-bottom: var(--space-xl);
}

.legal-content {
    max-width: 800px;
}

.legal-section {
    margin-bottom: var(--space-xl);
}

.legal-section h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.legal-section h3 {
    font-size: var(--font-size-h3);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.legal-section p {
    margin-bottom: var(--space-md);
    line-height: 1.7;
}

.legal-section ul {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

.legal-section li {
    margin-bottom: var(--space-xs);
    line-height: 1.6;
}

.legal-section strong {
    color: var(--color-text);
}

.legal-acknowledgment {
    background: var(--color-bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    margin-top: var(--space-2xl);
}

.legal-acknowledgment h2 {
    border-bottom: none;
    padding-bottom: 0;
}

/* FAQ Page */
.faq-page {
    padding-top: calc(52px + var(--space-2xl));
    padding-bottom: var(--space-3xl);
}

.faq-title {
    font-size: var(--font-size-h1);
    margin-bottom: var(--space-sm);
}

.faq-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    max-width: 600px;
}

.faq-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.faq-nav__link {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: 980px;
    font-size: var(--font-size-small);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.faq-nav__link:hover {
    background: var(--color-accent);
    color: white;
}

.faq-category {
    margin-bottom: var(--space-2xl);
}

.faq-category__title {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.faq-category__icon {
    font-size: 1.5rem;
}

.faq-item {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-md);
    overflow: hidden;
}

.faq-item summary {
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    font-weight: 600;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item__content {
    padding: 0 var(--space-lg) var(--space-lg);
    line-height: 1.7;
}

.faq-item__content p {
    margin-bottom: var(--space-md);
}

.faq-item__content p:last-child {
    margin-bottom: 0;
}

.faq-item__content ul,
.faq-item__content ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

.faq-item__content li {
    margin-bottom: var(--space-xs);
}

.faq-item__content code {
    background: var(--color-bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: var(--font-size-small);
}

.faq-item__content pre {
    background: var(--color-bg-secondary);
    padding: var(--space-md);
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin-bottom: var(--space-md);
}

.faq-item__content pre code {
    background: none;
    padding: 0;
}

.api-steps {
    counter-reset: step;
}

.api-step {
    position: relative;
    padding-left: var(--space-2xl);
    margin-bottom: var(--space-lg);
}

.api-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 28px;
    height: 28px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-small);
    font-weight: 600;
}

.api-step h4 {
    margin-bottom: var(--space-xs);
}

.api-step p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.tip-box {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.1), rgba(59, 130, 246, 0.1));
    border-left: 4px solid var(--color-accent);
    padding: var(--space-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin: var(--space-md) 0;
}

.tip-box strong {
    color: var(--color-accent);
}

.warning-box {
    background: rgba(255, 149, 0, 0.1);
    border-left: 4px solid var(--color-warning);
    padding: var(--space-md);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    margin: var(--space-md) 0;
}

.warning-box strong {
    color: var(--color-warning);
}

/* Responsive */
@media (max-width: 768px) {
    .nav__links {
        display: none;
    }

    .hero {
        min-height: auto;
        padding-top: calc(52px + var(--space-xl));
    }

    .hero__cta {
        flex-direction: column;
        align-items: center;
    }

    .hero__meta {
        flex-direction: column;
        align-items: center;
    }

    .section {
        padding: var(--space-2xl) 0;
    }

    .faq-nav {
        justify-content: center;
    }

    .legal-section h2 {
        font-size: var(--font-size-h3);
    }
}