/* ============================================
   DOCTOR ADS — thedoctorads.com
   Profit Forensics™ — Igor Ivitskiy, PhD
   ============================================ */

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

:root {
    --bg-primary: #0A0A0F;
    --bg-secondary: #12121A;
    --bg-surface: #1A1A25;
    --accent-gold: #C5A55A;
    --accent-blue: #3B82F6;
    --text-primary: #E8E6E3;
    --text-secondary: #8A8A97;
    --text-tertiary: #5A5A67;
    --glow-gold: rgba(197, 165, 90, 0.15);
    --border: rgba(255, 255, 255, 0.06);

    --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-sans: 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --max-width: 1200px;
    --text-width: 720px;
    --nav-height: 72px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

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

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

/* ---------- UTILITIES ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

.section {
    padding: 120px 0;
}

.section:nth-child(even) {
    background-color: var(--bg-secondary);
}

/* Section labels & titles */
.section__label {
    display: block;
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 24px;
}

.section__title {
    font-family: var(--font-serif);
    font-size: 42px;
    font-weight: 400;
    line-height: 1.25;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.section__title--centered {
    text-align: center;
}

.section__subtitle {
    font-family: var(--font-sans);
    font-size: 18px;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 600px;
    text-align: center;
    margin: 0 auto 60px;
}

.section__subtitle--left {
    text-align: left;
    margin: 0 0 60px;
}

.section__body {
    font-size: 17px;
    font-weight: 300;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: var(--text-width);
    margin-bottom: 20px;
}

/* ---------- BUTTONS ---------- */
.btn {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 16px 40px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn--outline:hover {
    box-shadow: 0 0 30px var(--glow-gold);
    background: rgba(197, 165, 90, 0.05);
}

.btn--solid {
    background: var(--accent-gold);
    color: var(--bg-primary);
}

.btn--solid:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
    box-shadow: 0 0 40px var(--glow-gold);
}

.btn--large {
    font-size: 15px;
    padding: 20px 52px;
}

/* Text links */
.text-link {
    color: var(--accent-gold);
    font-size: 17px;
    font-weight: 400;
    position: relative;
    transition: color 0.3s ease;
}

.text-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-gold);
    transition: width 0.3s ease;
}

.text-link:hover::after {
    width: 100%;
}

.text-link--secondary {
    color: var(--text-secondary);
    font-size: 15px;
}

.text-link--secondary::after {
    background: var(--text-secondary);
}

.text-link--secondary:hover {
    color: var(--accent-gold);
}

.text-link--secondary:hover::after {
    background: var(--accent-gold);
}

/* ---------- NAVIGATION ---------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.nav--scrolled {
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-family: var(--font-serif);
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

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

.nav__links {
    display: flex;
    gap: 40px;
}

.nav__link {
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    position: relative;
    transition: color 0.3s ease;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-gold);
    transition: width 0.3s ease;
}

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

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

/* Hamburger */
.nav__burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav__burger span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

.nav__burger--active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 5px);
}

.nav__burger--active span:nth-child(2) {
    opacity: 0;
}

.nav__burger--active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -5px);
}

/* Mobile menu */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(10, 10, 15, 0.97);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 40px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.mobile-menu--open {
    opacity: 1;
    pointer-events: all;
}

.mobile-menu__link {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 400;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.mobile-menu__link:hover {
    color: var(--accent-gold);
}

/* ---------- HERO ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--nav-height) 40px 40px;
    overflow: hidden;
}

.hero__mesh {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 60% 80% at 80% 30%, rgba(107, 70, 193, 0.05) 0%, transparent 70%),
        radial-gradient(ellipse 70% 50% at 50% 80%, rgba(197, 165, 90, 0.04) 0%, transparent 70%);
    animation: meshMove 25s ease-in-out infinite alternate;
}

@keyframes meshMove {
    0% {
        transform: scale(1) translate(0, 0);
    }
    33% {
        transform: scale(1.05) translate(-20px, 10px);
    }
    66% {
        transform: scale(1.02) translate(15px, -15px);
    }
    100% {
        transform: scale(1) translate(-10px, 5px);
    }
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero__label {
    display: block;
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 32px;
}

.hero__title {
    font-family: var(--font-serif);
    font-size: 56px;
    font-weight: 400;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 28px;
}

.hero__subtitle {
    font-family: var(--font-sans);
    font-size: 20px;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.hero__scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-tertiary);
    animation: scrollBounce 2s ease-in-out infinite;
}

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

/* ---------- PROBLEM ---------- */
.problem__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

/* Data Visualization */
.data-viz {
    display: flex;
    gap: 32px;
    justify-content: center;
}

.data-viz__column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    flex: 1;
}

.data-viz__label {
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    text-align: center;
    min-height: 36px;
}

.data-viz__bar-container {
    width: 100%;
    height: 240px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.data-viz__bar {
    width: 80px;
    position: relative;
    border-radius: 4px 4px 0 0;
    overflow: hidden;
}

.data-viz__bar--green {
    height: 85%;
    background: linear-gradient(180deg, rgba(74, 222, 128, 0.3) 0%, rgba(74, 222, 128, 0.1) 100%);
    border: 1px solid rgba(74, 222, 128, 0.4);
}

.data-viz__bar--decomposed {
    height: 85%;
    display: flex;
    flex-direction: column-reverse;
    width: 80px;
}

.data-viz__segment {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.6s ease;
}

.data-viz__segment--profit {
    height: var(--height);
    background: linear-gradient(180deg, rgba(197, 165, 90, 0.4) 0%, rgba(197, 165, 90, 0.2) 100%);
    border: 1px solid rgba(197, 165, 90, 0.5);
    border-bottom: none;
    border-radius: 4px 4px 0 0;
}

.data-viz__segment--breakeven {
    height: var(--height);
    background: linear-gradient(180deg, rgba(138, 138, 151, 0.2) 0%, rgba(138, 138, 151, 0.1) 100%);
    border: 1px solid rgba(138, 138, 151, 0.3);
    border-bottom: none;
}

.data-viz__segment--loss {
    height: var(--height);
    background: linear-gradient(180deg, rgba(239, 68, 68, 0.3) 0%, rgba(239, 68, 68, 0.1) 100%);
    border: 1px solid rgba(239, 68, 68, 0.4);
}

.data-viz__segment-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.data-viz__metric {
    text-align: center;
}

.data-viz__number {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.data-viz__number--gold {
    color: var(--accent-gold);
}

/* ---------- METHODOLOGY ---------- */
.methodology__header {
    text-align: center;
    margin-bottom: 60px;
}

.methodology__cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

/* Cards */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 40px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    border-color: rgba(197, 165, 90, 0.3);
    box-shadow: 0 0 40px rgba(197, 165, 90, 0.05);
}

.card__number {
    display: block;
    font-family: var(--font-mono);
    font-size: 36px;
    color: var(--accent-gold);
    margin-bottom: 24px;
}

.card__title {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.3;
}

.card__body {
    font-size: 15px;
    font-weight: 300;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* ---------- TESTIMONIALS ---------- */
.testimonials {
    padding: 80px 0;
}

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.testimonial {
    border-left: 2px solid var(--accent-gold);
    padding-left: 32px;
}

.testimonial__quote {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 400;
    font-style: italic;
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.testimonial__cite {
    font-family: var(--font-sans);
    font-size: 14px;
    font-style: normal;
    color: var(--text-tertiary);
    letter-spacing: 0.5px;
}

/* ---------- EVIDENCE ---------- */
.evidence__metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 80px;
}

.metric {
    text-align: center;
}

.metric__number {
    display: block;
    font-family: var(--font-mono);
    font-size: 48px;
    color: var(--accent-gold);
    margin-bottom: 12px;
    line-height: 1;
}

.metric__label {
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-tertiary);
}

/* Credentials */
.evidence__credentials {
    display: flex;
    align-items: center;
    gap: 40px;
    padding-top: 60px;
    border-top: 1px solid var(--border);
}

.evidence__photo {
    flex-shrink: 0;
}

.evidence__photo-placeholder {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 2px solid var(--accent-gold);
    background: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    font-size: 14px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.evidence__photo-placeholder img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.evidence__creds-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    line-height: 2;
}

.cred {
    font-family: var(--font-sans);
    font-size: 14px;
    color: var(--text-secondary);
}

.cred a {
    color: var(--text-secondary);
    text-decoration: underline;
    text-decoration-color: var(--text-tertiary);
    text-underline-offset: 3px;
    transition: color 0.3s ease, text-decoration-color 0.3s ease;
}

.cred a:hover {
    color: var(--accent-gold);
    text-decoration-color: var(--accent-gold);
}

.cred-sep {
    color: var(--accent-gold);
    font-size: 18px;
    line-height: 1;
}

/* ---------- INSIGHT ---------- */
.insight__cards {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 32px;
    margin-top: 40px;
    margin-bottom: 60px;
}

.insight__card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 40px;
    transition: border-color 0.3s ease;
}

.insight__card:hover {
    border-color: rgba(197, 165, 90, 0.2);
}

.insight__tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 20px;
}

.insight__title {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 400;
    line-height: 1.35;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.insight__card--featured .insight__title {
    font-size: 28px;
}

.insight__excerpt {
    font-size: 16px;
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.insight__link {
    color: var(--accent-gold);
    font-size: 15px;
    font-weight: 400;
    transition: opacity 0.3s ease;
}

.insight__link:hover {
    opacity: 0.8;
}

/* Subscribe */
.insight__subscribe {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.insight__subscribe-text {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.subscribe-form {
    display: flex;
    gap: 12px;
    max-width: 440px;
    margin: 0 auto;
}

.subscribe-form__input {
    flex: 1;
    font-family: var(--font-sans);
    font-size: 15px;
    padding: 14px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.3s ease;
}

.subscribe-form__input::placeholder {
    color: var(--text-tertiary);
}

.subscribe-form__input:focus {
    border-color: var(--accent-gold);
}

.subscribe-form__btn {
    padding: 14px 28px;
    font-size: 13px;
    white-space: nowrap;
}

.subscribe-form__status,
.contact-form__status {
    font-size: 14px;
    color: var(--accent-gold);
    margin-top: 12px;
    min-height: 20px;
    text-align: center;
}

/* ---------- SPEAKING ---------- */
.speaking__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.speaking-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 32px;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.speaking-card:hover {
    transform: translateY(-4px);
    border-color: rgba(197, 165, 90, 0.2);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.speaking-card__name {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.speaking-card__details {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.speaking-card__topic {
    font-size: 15px;
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.5;
}

.speaking__cta {
    text-align: left;
}

.speaking__cta-text {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.speaking__cta-links {
    display: flex;
    gap: 32px;
    align-items: center;
}

/* ---------- DIAGNOSTIC ---------- */
.diagnostic {
    background: var(--bg-secondary);
    position: relative;
    overflow: hidden;
}

.diagnostic::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 50%, rgba(197, 165, 90, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.diagnostic__inner {
    text-align: center;
    position: relative;
    z-index: 1;
}

.diagnostic__body {
    font-size: 18px;
    font-weight: 300;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.diagnostic__price {
    margin-bottom: 40px;
}

.diagnostic__amount {
    font-family: var(--font-mono);
    font-size: 36px;
    color: var(--accent-gold);
}

.diagnostic__fine-print {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-top: 24px;
}

/* ---------- CONTACT FORM ---------- */
.contact-form-section {
    padding: 80px 0;
}

.contact-form-section__inner {
    max-width: 560px;
    margin: 0 auto;
    text-align: center;
}

.contact-form-section__title {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form__input,
.contact-form__textarea {
    font-family: var(--font-sans);
    font-size: 15px;
    padding: 16px 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.3s ease;
    resize: vertical;
}

.contact-form__input::placeholder,
.contact-form__textarea::placeholder {
    color: var(--text-tertiary);
}

.contact-form__input:focus,
.contact-form__textarea:focus {
    border-color: var(--accent-gold);
}

.contact-form__btn {
    align-self: center;
    min-width: 200px;
}

/* ---------- FOOTER ---------- */
.footer {
    padding: 60px 0;
}

.footer__line {
    width: 50%;
    height: 1px;
    background: var(--accent-gold);
    opacity: 0.3;
    margin: 0 auto 60px;
}

.footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.footer__left {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer__logo {
    font-family: var(--font-serif);
    font-size: 14px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-primary);
}

.footer__name,
.footer__copy {
    font-size: 13px;
    color: var(--text-tertiary);
}

.footer__right {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
}

.footer__link {
    font-size: 13px;
    color: var(--text-tertiary);
    transition: color 0.3s ease;
}

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

/* ---------- ANIMATIONS ---------- */

/* Hero entrance animations */
.anim-fade {
    opacity: 0;
    animation: fadeIn 800ms ease-out forwards;
    animation-delay: var(--delay, 0ms);
}

.anim-fade-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 800ms ease-out forwards;
    animation-delay: var(--delay, 0ms);
}

@keyframes fadeIn {
    to { opacity: 1; }
}

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

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal--visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.methodology__cards .reveal:nth-child(1) { transition-delay: 0ms; }
.methodology__cards .reveal:nth-child(2) { transition-delay: 150ms; }
.methodology__cards .reveal:nth-child(3) { transition-delay: 300ms; }

.evidence__metrics .reveal:nth-child(1) { transition-delay: 0ms; }
.evidence__metrics .reveal:nth-child(2) { transition-delay: 150ms; }
.evidence__metrics .reveal:nth-child(3) { transition-delay: 300ms; }
.evidence__metrics .reveal:nth-child(4) { transition-delay: 450ms; }

.speaking__grid .reveal:nth-child(1) { transition-delay: 0ms; }
.speaking__grid .reveal:nth-child(2) { transition-delay: 100ms; }
.speaking__grid .reveal:nth-child(3) { transition-delay: 200ms; }
.speaking__grid .reveal:nth-child(4) { transition-delay: 300ms; }
.speaking__grid .reveal:nth-child(5) { transition-delay: 400ms; }

.testimonials__grid .reveal:nth-child(1) { transition-delay: 0ms; }
.testimonials__grid .reveal:nth-child(2) { transition-delay: 200ms; }

/* ---------- RESPONSIVE ---------- */

@media (max-width: 1024px) {
    .container {
        padding: 0 32px;
    }

    .section {
        padding: 80px 0;
    }

    .hero__title {
        font-size: 44px;
    }

    .hero__subtitle {
        font-size: 18px;
    }

    .section__title {
        font-size: 36px;
    }

    .problem__grid {
        gap: 48px;
    }

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

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

    .insight__cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }

    .section {
        padding: 60px 0;
    }

    /* Navigation */
    .nav__links {
        display: none;
    }

    .nav__burger {
        display: flex;
    }

    .nav__inner {
        padding: 0 24px;
    }

    /* Hero */
    .hero {
        padding: var(--nav-height) 24px 40px;
    }

    .hero__title {
        font-size: 36px;
    }

    .hero__subtitle {
        font-size: 16px;
    }

    .hero__subtitle br {
        display: none;
    }

    /* Problem */
    .problem__grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .section__title {
        font-size: 32px;
    }

    .section__subtitle {
        text-align: left;
    }

    .section__subtitle br {
        display: none;
    }

    /* Methodology */
    .methodology__header {
        text-align: left;
    }

    .methodology__header .section__title--centered {
        text-align: left;
    }

    .methodology__header .section__subtitle {
        text-align: left;
        margin-left: 0;
    }

    .methodology__cards {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 24px;
    }

    /* Testimonials */
    .testimonials__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .testimonial__quote {
        font-size: 18px;
    }

    /* Evidence */
    .evidence__metrics {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .metric__number {
        font-size: 36px;
    }

    .evidence__credentials {
        flex-direction: column;
        text-align: center;
    }

    .evidence__creds-list {
        justify-content: center;
    }

    .cred-sep {
        display: none;
    }

    .evidence__creds-list {
        flex-direction: column;
        gap: 12px;
    }

    .cred {
        display: block;
        padding-left: 16px;
        border-left: 2px solid var(--accent-gold);
        text-align: left;
    }

    /* Insight */
    .insight__cards {
        grid-template-columns: 1fr;
    }

    .insight__card {
        padding: 24px;
    }

    .insight__card--featured .insight__title {
        font-size: 22px;
    }

    .subscribe-form {
        flex-direction: column;
    }

    /* Speaking */
    .speaking__grid {
        grid-template-columns: 1fr;
    }

    .speaking-card {
        padding: 24px;
    }

    .speaking__cta-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    /* Diagnostic */
    .diagnostic__amount {
        font-size: 28px;
    }

    .diagnostic__body {
        font-size: 16px;
    }

    .btn--large {
        width: 100%;
        text-align: center;
    }

    /* Footer */
    .footer__inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 24px;
    }

    .footer__right {
        align-items: flex-start;
    }

    .footer__line {
        width: 80%;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 30px;
    }

    .section__title {
        font-size: 28px;
    }

    .metric__number {
        font-size: 32px;
    }

    .card__number {
        font-size: 28px;
    }

    .data-viz {
        gap: 16px;
    }

    .data-viz__bar {
        width: 60px;
    }

    .data-viz__bar-container {
        height: 180px;
    }

    .btn--outline {
        width: 100%;
        text-align: center;
    }
}