/* ============================================
   AI Sale Agent — Landing Page Styles
   ============================================ */

/* --- CSS Variables --- */
:root {
    --bg: #0B0F19;
    --primary: #6366F1;
    --accent: #06B6D4;
    --text: #E2E8F0;
    --text-muted: #94A3B8;
    --success: #10B981;
    --bg-card: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --transition: 0.3s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.scroll-lock {
    overflow: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

/* --- Container --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Section Title --- */
.section-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Glassmorphism --- */
.glass {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

.btn--outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border-color);
}

.btn--outline:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.btn--full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn__loader {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition);
    background: transparent;
}

.header--scrolled {
    background: rgba(11, 15, 25, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo__icon {
    width: 36px;
    height: 36px;
}

.nav__list {
    display: none;
    gap: 32px;
}

.nav__link {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width var(--transition);
}

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

.nav__link:hover::after {
    width: 100%;
}

.nav__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    border-radius: 10px;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.nav__cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px rgba(99, 102, 241, 0.6);
}

.nav__cta::after {
    display: none;
}

/* Burger */
.burger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
    transform-origin: center;
}

.burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.burger.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav overlay */
.nav.active {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 15, 25, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    align-items: center;
    justify-content: center;
    z-index: 999;
    animation: fadeIn 0.3s ease;
}

.nav.active .nav__list {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 32px;
}

.nav.active .nav__link {
    font-size: 24px;
    color: var(--text);
}

.nav.active .nav__cta {
    font-size: 18px;
    padding: 14px 28px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero__bg-gradient {
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, rgba(6, 182, 212, 0.15) 50%, transparent 70%);
    border-radius: 50%;
    animation: pulseGlow 6s ease-in-out infinite;
    pointer-events: none;
}

.hero__inner {
    display: grid;
    gap: 48px;
    align-items: center;
}

.hero__title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero__subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem);
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 540px;
}

.hero__buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

/* Hero diagram */
.hero__visual {
    display: flex;
    justify-content: center;
}

.hero__diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
}

.diagram__node {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    animation: floatNode 3s ease-in-out infinite;
}

.diagram__node svg {
    width: 24px;
    height: 24px;
}

.diagram__node--query {
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--primary);
    animation-delay: 0s;
}

.diagram__node--rag {
    border-color: rgba(6, 182, 212, 0.3);
    color: var(--accent);
    animation-delay: 1s;
}

.diagram__node--answer {
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
    animation-delay: 2s;
}

.diagram__arrow {
    color: var(--text-muted);
    animation: pulseArrow 2s ease-in-out infinite;
}

.diagram__arrow svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   PROBLEMS SECTION
   ============================================ */
.problems {
    padding: 80px 0;
}

.problems__grid {
    display: grid;
    gap: 24px;
    margin-bottom: 48px;
}

.card {
    padding: 32px 24px;
    transition: all var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.2);
}

.card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.15));
    color: var(--primary);
}

.card__icon svg {
    width: 24px;
    height: 24px;
}

.card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.card__text {
    color: var(--text-muted);
    line-height: 1.6;
}

/* Solution block */
.solution__content {
    padding: 40px 32px;
}

.solution__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    text-align: center;
}

.solution__list {
    display: grid;
    gap: 16px;
}

.solution__item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
}

.solution__check {
    width: 20px;
    height: 20px;
    color: var(--success);
    flex-shrink: 0;
}

/* ============================================
   TECHNOLOGY SECTION
   ============================================ */
.tech {
    padding: 80px 0;
}

.tech__pipeline {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.tech__block {
    text-align: center;
    padding: 28px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    width: 100%;
    max-width: 320px;
    transition: all var(--transition);
}

.tech__block:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.2);
}

.tech__block--accent {
    border-color: rgba(6, 182, 212, 0.3);
    background: rgba(6, 182, 212, 0.08);
}

.tech__icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.15));
    color: var(--primary);
}

.tech__block--accent .tech__icon {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(99, 102, 241, 0.2));
    color: var(--accent);
}

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

.tech__name {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.tech__desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

.tech__arrow {
    color: var(--text-muted);
    transform: rotate(90deg);
}

.tech__arrow svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   CASE STUDY SECTION
   ============================================ */
.case {
    padding: 80px 0;
}

.case__metrics {
    display: grid;
    gap: 24px;
    margin-bottom: 48px;
}

.metric {
    padding: 40px 24px;
    text-align: center;
    transition: all var(--transition);
}

.metric:hover {
    transform: translateY(-4px);
}

.metric__icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.15));
    color: var(--accent);
}

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

.metric__value {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.metric__label {
    color: var(--text-muted);
    font-size: 15px;
}

.case__cta {
    text-align: center;
}

/* ============================================
   AUTHOR SECTION
   ============================================ */
.author {
    padding: 80px 0;
}

.author__content {
    padding: 40px 28px;
}

.author__intro {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
    margin-bottom: 40px;
}

.author__avatar {
    width: 120px;
    height: 120px;
    flex-shrink: 0;
}

.author__avatar svg {
    width: 100%;
    height: 100%;
}

.author__name {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.author__role {
    font-size: 15px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
}

.author__bio {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto;
}

.author__stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.author__stat {
    text-align: center;
    padding: 20px 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.author__stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.author__stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

.author__details {
    display: grid;
    gap: 28px;
}

.author__block {
    padding: 24px 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
}

.author__block-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text);
}

.author__block-list {
    list-style: none;
    padding: 0;
}

.author__block-list li {
    position: relative;
    padding: 6px 0 6px 20px;
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.6;
}

.author__block-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

.author__certs {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.author__certs-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text);
}

.author__certs-title svg {
    color: var(--accent);
}

.author__certs-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(2, 1fr);
}

.cert-placeholder {
    aspect-ratio: 4 / 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    transition: all var(--transition);
}

.cert-placeholder:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
}

.cert-placeholder svg {
    width: 40px;
    height: 40px;
    color: var(--text-muted);
}

.cert-placeholder span {
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
}

.cert-image {
    aspect-ratio: 4 / 3;
    object-fit: cover;
    width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition);
}

.cert-image:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.2);
}

/* ============================================
   PRICING SECTION
   ============================================ */
.pricing {
    padding: 80px 0;
}

.pricing__grid {
    display: grid;
    gap: 24px;
    align-items: start;
}

.pricing-card {
    padding: 36px 28px;
    text-align: center;
    position: relative;
    transition: all var(--transition);
}

.pricing-card:hover {
    transform: translateY(-4px);
}

.pricing-card--featured {
    border-color: var(--accent);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.15), var(--shadow);
    transform: scale(1);
}

.pricing-card--featured:hover {
    transform: scale(1.02) translateY(-4px);
}

.pricing-card__badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-card__name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.pricing-card__price {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-card__features {
    margin-bottom: 28px;
    text-align: left;
}

.pricing-card__features li {
    padding: 8px 0;
    color: var(--text-muted);
    font-size: 15px;
    position: relative;
    padding-left: 24px;
}

.pricing-card__features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    padding: 80px 0;
}

.contact__form-wrapper {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 32px;
}

.form__group {
    margin-bottom: 24px;
}

.form__label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text);
    font-size: 16px;
    font-family: var(--font);
    transition: all var(--transition);
    outline: none;
}

.form__input:focus,
.form__textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form__input.error,
.form__textarea.error {
    border-color: #EF4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.form__textarea {
    min-height: 120px;
    resize: vertical;
}

.form__error {
    display: block;
    font-size: 13px;
    color: #EF4444;
    margin-top: 6px;
    min-height: 18px;
}

.form__group--checkbox {
    margin-bottom: 28px;
}

.form__checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
}

.form__checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.form__checkbox-custom {
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    margin-top: 1px;
    background: rgba(255, 255, 255, 0.03);
}

.form__checkbox-custom::after {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 2px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    transform: scale(0);
    transition: transform var(--transition);
}

.form__checkbox-label input[type="checkbox"]:checked + .form__checkbox-custom {
    border-color: var(--primary);
}

.form__checkbox-label input[type="checkbox"]:checked + .form__checkbox-custom::after {
    transform: scale(1);
}

.form__checkbox-text {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.5;
}

.form__success {
    text-align: center;
    padding: 40px 20px;
    animation: fadeInUp 0.5s ease;
}

.form__success svg {
    color: var(--success);
    margin-bottom: 16px;
}

.form__success h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.form__success p {
    color: var(--text-muted);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.footer__copy {
    color: var(--text-muted);
    font-size: 14px;
}

.footer__privacy {
    display: inline-block;
    margin-top: 8px;
    font-size: 13px;
    color: var(--accent);
    text-decoration: underline;
    transition: color var(--transition);
}

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

.footer__links {
    display: flex;
    gap: 20px;
}

.footer__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    transition: all var(--transition);
}

.footer__link:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
}

/* Scroll to top button */
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
    z-index: 100;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes pulseGlow {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

@keyframes floatNode {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes pulseArrow {
    0%, 100% {
        opacity: 0.4;
    }
    50% {
        opacity: 1;
    }
}

/* Intersection observer animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   MEDIA QUERIES
   ============================================ */

/* 576px */
@media (min-width: 576px) {
    .container {
        padding: 0 24px;
    }

    .hero__buttons {
        flex-direction: row;
    }

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

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

    .case__metrics .metric:last-child {
        grid-column: span 2;
    }
}

/* 768px */
@media (min-width: 768px) {
    .container {
        padding: 0 32px;
    }

    .hero__inner {
        grid-template-columns: 1fr 1fr;
        gap: 64px;
    }

    .hero__diagram {
        flex-direction: row;
    }

    .diagram__arrow {
        transform: rotate(0deg);
    }

    .problems__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .case__metrics {
        grid-template-columns: repeat(3, 1fr);
    }

    .case__metrics .metric:last-child {
        grid-column: auto;
    }

    .author__intro {
        flex-direction: row;
        text-align: left;
        gap: 32px;
    }

    .author__bio {
        margin: 0;
    }

    .author__stats {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .author__certs-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .pricing__grid {
        grid-template-columns: repeat(3, 1fr);
        align-items: center;
    }

    .tech__pipeline {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .tech__arrow {
        transform: rotate(0deg);
    }

    .tech__block {
        max-width: 240px;
    }

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

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

/* 1024px */
@media (min-width: 1024px) {
    .container {
        padding: 0 40px;
    }

    .burger {
        display: none;
    }

    .nav__list {
        display: flex;
    }

    .hero__bg-gradient {
        width: 800px;
        height: 800px;
        top: -10%;
        right: -5%;
    }
}