/* ============================================
   Nightingale Systems — Styles
   Palette: monochrome (black/white) with subtle
   accent grays. Inspired by the logo's clean
   linework and inverted-triangle motif.
   ============================================ */

:root {
    --color-bg: #0a0a0a;
    --color-bg-elevated: #131313;
    --color-bg-card: #161616;
    --color-surface: #1c1c1c;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-strong: rgba(255, 255, 255, 0.18);
    --color-text: #f4f4f2;
    --color-text-muted: #a8a8a4;
    --color-text-subtle: #6e6e6a;
    --color-accent: #ffffff;
    --color-accent-dim: #e8e8e4;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;

    --container-max: 1200px;
    --section-padding: clamp(5rem, 10vw, 8rem);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --transition-fast: 150ms ease;
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 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-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

/* ===== Layout Helpers ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
}

.section {
    padding-top: var(--section-padding);
    padding-bottom: var(--section-padding);
    position: relative;
}

.section-header {
    max-width: 720px;
    margin: 0 auto 4rem;
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    margin-bottom: 1.5rem;
}

.section-tag.light {
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.25rem;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-display);
    font-size: 0.9375rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--color-text);
}

.btn-ghost {
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

.btn-ghost:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
    border-color: var(--color-text);
}

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

.btn-outline:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1rem;
}

/* ===== Header / Nav ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.25rem 0;
    transition: background-color var(--transition-base), backdrop-filter var(--transition-base), padding var(--transition-base);
}

.site-header.scrolled {
    background-color: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 0;
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1.5rem, 4vw, 3rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-logo img {
    height: 44px;
    width: 44px;
    object-fit: contain;
}

.nav-logo-text {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-menu a {
    font-size: 0.9375rem;
    font-weight: 400;
    color: var(--color-text-muted);
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-text);
}

.nav-menu a:not(.nav-cta)::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 1px;
    background-color: var(--color-text);
    transition: width var(--transition-base);
}

.nav-menu a:not(.nav-cta):hover::after {
    width: 100%;
}

.nav-cta {
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    color: var(--color-text) !important;
    font-weight: 500;
}

.nav-cta:hover {
    background-color: var(--color-text);
    color: var(--color-bg) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-base), opacity var(--transition-fast);
}

/* Dedicated close (X) button — only visible on mobile when the menu is open.
   Display stays `none` on desktop; the mobile media query below switches it
   to `flex` and uses opacity/transform for show/hide so it can animate. */
.nav-close {
    display: none;
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    color: var(--color-text);
    cursor: pointer;
    z-index: 10;
}

.nav-close:hover {
    background-color: var(--color-surface);
    border-color: var(--color-border-strong);
}

.nav-close svg {
    width: 18px;
    height: 18px;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 8rem 1.5rem 4rem;
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
    pointer-events: none;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    max-width: 90vw;
    max-height: 90vw;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    max-width: 900px;
    text-align: center;
    z-index: 2;
}

.hero-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    margin-bottom: 2rem;
    animation: fadeUp 0.8s ease-out both;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 7vw, 5rem);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    animation: fadeUp 0.8s ease-out 0.1s both;
}

.hero-title .accent {
    color: var(--color-text-muted);
    font-weight: 400;
    font-style: italic;
}

.hero-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.1875rem);
    color: var(--color-text-muted);
    line-height: 1.65;
    max-width: 680px;
    margin: 0 auto 2.5rem;
    animation: fadeUp 0.8s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeUp 0.8s ease-out 0.3s both;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-subtle);
    font-family: var(--font-display);
    font-size: 0.6875rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    animation: fadeUp 1s ease-out 0.6s both;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-subtle), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -20px;
    left: 0;
    width: 100%;
    height: 20px;
    background: linear-gradient(to bottom, transparent, var(--color-text));
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0%, 100% { transform: translateY(0); opacity: 0; }
    50% { transform: translateY(40px); opacity: 1; }
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Capabilities Strip ===== */
.capabilities {
    padding: 3rem 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg-elevated);
}

.capability-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.capability-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 0;
}

.capability-number {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-subtle);
    letter-spacing: 0.1em;
}

.capability-label {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    letter-spacing: 0.01em;
}

/* ===== Services ===== */
.services {
    background-color: var(--color-bg);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.service-card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2.5rem 2rem;
    transition: transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-strong), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
    background-color: var(--color-surface);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 1.75rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background-color: var(--color-bg);
}

.service-icon svg {
    width: 28px;
    height: 28px;
}

.service-card h3 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.875rem;
    letter-spacing: -0.01em;
}

.service-card p {
    color: var(--color-text-muted);
    line-height: 1.65;
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.service-features {
    border-top: 1px solid var(--color-border);
    padding-top: 1.25rem;
}

.service-features li {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    padding: 0.375rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.service-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.875rem;
    width: 8px;
    height: 1px;
    background-color: var(--color-text-subtle);
}

/* ===== Approach ===== */
.approach {
    background-color: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.approach-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: clamp(2rem, 6vw, 5rem);
    align-items: start;
}

.approach-intro .section-title {
    margin-bottom: 1.5rem;
}

.approach-intro p {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    font-size: 1.0625rem;
    line-height: 1.65;
}

.approach-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.approach-step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-border);
    transition: transform var(--transition-base);
}

.approach-step:last-child {
    border-bottom: none;
}

.approach-step:hover {
    transform: translateX(8px);
}

.step-number {
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-subtle);
    letter-spacing: 0.1em;
    padding-top: 0.25rem;
}

.step-content h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.step-content p {
    color: var(--color-text-muted);
    line-height: 1.65;
    font-size: 0.9375rem;
}

/* ===== About ===== */
.about {
    background-color: var(--color-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: clamp(2rem, 6vw, 5rem);
    align-items: center;
}

.about-content p {
    color: var(--color-text-muted);
    font-size: 1.0625rem;
    line-height: 1.7;
    margin-bottom: 1.25rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.stat {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 2rem 1.5rem;
    transition: border-color var(--transition-base), background-color var(--transition-base);
}

.stat:hover {
    border-color: var(--color-border-strong);
    background-color: var(--color-surface);
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2.25rem;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 0.625rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    letter-spacing: 0.01em;
}

/* ===== Contact ===== */
.contact {
    background-color: var(--color-bg);
    padding-bottom: calc(var(--section-padding) + 2rem);
}

.contact-card {
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(3rem, 6vw, 5rem) clamp(2rem, 5vw, 4rem);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

.contact-content {
    position: relative;
    z-index: 1;
}

.contact-intro {
    color: var(--color-text-muted);
    font-size: 1.0625rem;
    line-height: 1.65;
    margin-bottom: 2.5rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Consultation form ===== */
.consult-form {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-field label {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.form-field .req {
    color: var(--color-text);
    margin-left: 2px;
}

.form-field input,
.form-field select,
.form-field textarea {
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.875rem 1rem;
    transition: border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
}

.form-field textarea {
    resize: vertical;
    min-height: 120px;
    font-family: var(--font-sans);
    line-height: 1.6;
}

.form-field select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none' stroke='%23a8a8a4' stroke-width='1.5'%3E%3Cpath d='M1 1.5l5 5 5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
    cursor: pointer;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
    color: var(--color-text-subtle);
}

.form-field input:hover,
.form-field select:hover,
.form-field textarea:hover {
    border-color: var(--color-border-strong);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--color-text);
    background-color: var(--color-bg-elevated);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.08);
}

.form-field.has-error input,
.form-field.has-error select,
.form-field.has-error textarea {
    border-color: #d97777;
}

.field-error {
    display: none;
    font-size: 0.8125rem;
    color: #e89b9b;
    margin-top: 0.25rem;
}

.form-field.has-error .field-error {
    display: block;
}

/* Honeypot — hidden from real users but visible to bots */
.form-honeypot {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.form-actions .btn {
    min-width: 220px;
    position: relative;
}

.form-disclaimer {
    font-size: 0.8125rem !important;
    color: var(--color-text-subtle) !important;
    margin: 0 !important;
    text-align: center;
}

/* Submit button loading state */
.btn-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.consult-form.is-submitting .btn-label {
    opacity: 0.6;
}

.consult-form.is-submitting .btn-spinner {
    display: inline-block;
}

.consult-form.is-submitting button[type="submit"] {
    pointer-events: none;
}

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

/* Inline status message (errors during submit) */
.form-status {
    text-align: center;
    font-size: 0.9375rem;
    color: #e89b9b;
    min-height: 1.25rem;
}

.form-status:empty {
    display: none;
}

/* Success state */
.form-success {
    text-align: center;
    padding: 1.5rem 0;
    animation: fadeUp 0.5s ease-out both;
}

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    color: var(--color-text);
}

.success-icon svg {
    width: 100%;
    height: 100%;
}

.form-success h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.form-success p {
    color: var(--color-text-muted);
    max-width: 420px;
    margin: 0 auto !important;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ===== Footer ===== */
.site-footer {
    background-color: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding: 4rem 0 2rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    line-height: 1.65;
    max-width: 360px;
    margin-top: 1rem;
}

.footer-logo {
    height: 56px;
    width: 56px;
    object-fit: contain;
}

.footer-links h5 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.footer-links ul li {
    margin-bottom: 0.625rem;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: var(--color-text);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-bottom p {
    color: var(--color-text-subtle);
    font-size: 0.8125rem;
}

.footer-fineprint {
    font-size: 0.75rem !important;
    line-height: 1.5;
}

/* ===== Scroll-reveal helper ===== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .approach-grid,
    .about-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 720px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(85vw, 320px);
        background-color: var(--color-bg-elevated);
        border-left: 1px solid var(--color-border);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 6rem 2rem 2rem;
        gap: 0;
        transform: translateX(100%);
        transition: transform var(--transition-base);
    }

    .nav-menu.open {
        transform: translateX(0);
    }

    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu a {
        display: block;
        padding: 1rem 0;
        font-size: 1.0625rem;
    }

    .nav-cta {
        margin-top: 1rem;
        text-align: center;
        border: 1px solid var(--color-border-strong) !important;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    /* When the mobile menu is open: lock body scroll, and drop the
       header's backdrop-filter so it doesn't create a containing
       block that confines the menu's position:fixed to the header's
       bounds (causing the menu background to appear "clipped").
       `transition: none` is required — the default 250ms fade on
       backdrop-filter would otherwise keep the containing-block
       effect alive for the full duration of the menu slide-in. */
    body.menu-open {
        overflow: hidden;
    }

    body.menu-open .site-header,
    body.menu-open .site-header.scrolled {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        background-color: var(--color-bg);
        transition: none;
    }

    /* X close button on mobile: always laid out (flex), but its
       visibility is driven by .nav-menu.open so it fades in/out in
       lockstep with the panel's slide animation rather than vanishing
       the instant the close handler runs. */
    .nav-close {
        display: flex;
        opacity: 0;
        pointer-events: none;
        transform: scale(0.92) translateX(8px);
        transition:
            opacity var(--transition-base) ease,
            transform var(--transition-base) ease,
            background-color var(--transition-fast) ease,
            border-color var(--transition-fast) ease;
    }

    .nav-close.is-visible {
        opacity: 1;
        pointer-events: auto;
        transform: scale(1) translateX(0);
    }

    .nav-close.is-visible:active {
        transform: scale(0.94);
    }

    .nav-logo-text {
        font-size: 0.9375rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 320px;
        margin: 0 auto;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .about-stats {
        grid-template-columns: 1fr 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .approach-step {
        gap: 1.25rem;
    }
}

@media (max-width: 480px) {
    .hero-eyebrow {
        font-size: 0.6875rem;
        padding: 0.5rem 1rem;
    }

    .stat {
        padding: 1.5rem 1rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}