/* ============================================
   Path & Line — Visual System
   AI & Automation Consultancy
   ============================================ */

/* --- Design Tokens --- */
:root {
    /* Colour palette */
    --color-bg: #E8E4DC;
    --color-bg-warm: #E2DED5;
    --color-blue: #213C63;
    --color-blue-light: rgba(33, 60, 99, 0.08);
    --color-accent: #C7DF72;
    --color-accent-dim: rgba(199, 223, 114, 0.4);
    --color-black: #000000;
    --color-gray-900: #1a1a1a;
    --color-gray-700: #333333;
    --color-gray-500: #666666;
    --color-gray-400: #999999;
    --color-gray-200: #CCCCCC;
    --color-white: #FFFFFF;

    /* Typography */
    --font-primary: 'Afacad', sans-serif;
    --font-secondary: 'EB Garamond', serif;
    --font-ampersand: 'Outfit', sans-serif;

    /* Spacing (4px base unit) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;
    --space-32: 128px;

    /* Grid */
    --grid-columns: 12;
    --grid-margin: 16px;
    --grid-gutter: 12px;
    --grid-max: 1280px;

    /* Transitions */
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 200ms;
    --duration-base: 400ms;
    --duration-slow: 800ms;
}

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

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

body {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: 17px;
    line-height: 1.65;
    color: var(--color-gray-900);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; }

::selection {
    background: var(--color-accent);
    color: var(--color-black);
}

/* --- Utility Grid --- */
.section__grid {
    max-width: var(--grid-max);
    margin: 0 auto;
    padding: 0 var(--space-10);
}

@media (max-width: 768px) {
    .section__grid {
        padding: 0 var(--space-6);
    }
}

/* --- Section Header --- */
.section__header {
    margin-bottom: var(--space-16);
}

.section__number {
    display: block;
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-gray-400);
    margin-bottom: var(--space-4);
}

.section__title {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: clamp(36px, 5vw, 56px);
    line-height: 1.1;
    color: var(--color-black);
    letter-spacing: -0.01em;
}

.section__rule {
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    margin-top: var(--space-6);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(232, 228, 220, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration-base) var(--ease-out),
                background var(--duration-base) var(--ease-out);
}

.nav--scrolled {
    border-bottom-color: rgba(33, 60, 99, 0.1);
}

.nav__inner {
    max-width: var(--grid-max);
    margin: 0 auto;
    padding: var(--space-5) var(--space-10);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav__logo {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 20px;
    letter-spacing: 0.08em;
    color: var(--color-black);
    display: flex;
    align-items: baseline;
    gap: 1px;
    transition: opacity var(--duration-fast);
}

.nav__logo:hover {
    opacity: 0.7;
}

.logo-amp {
    font-family: var(--font-ampersand);
    font-weight: 700;
    font-size: 1.45em;
    line-height: 0.85;
    position: relative;
    top: 0.02em;
    margin: 0 -1px;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-10);
}

.nav__link {
    font-family: var(--font-primary);
    font-weight: 400;
    font-size: 15px;
    letter-spacing: 0.02em;
    color: var(--color-gray-700);
    position: relative;
    transition: color var(--duration-fast);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-blue);
    transition: width var(--duration-base) var(--ease-out);
}

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

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

.nav__link--cta {
    font-weight: 500;
    color: var(--color-blue);
    padding: var(--space-2) var(--space-5);
    border: 1px solid var(--color-blue);
    transition: all var(--duration-fast);
}

.nav__link--cta::after { display: none; }

.nav__link--cta:hover {
    background: var(--color-blue);
    color: var(--color-white);
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-2);
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--color-black);
    transition: all var(--duration-base) var(--ease-out);
}

.nav__toggle--open span:first-child {
    transform: rotate(45deg) translate(3px, 3px);
}

.nav__toggle--open span:last-child {
    transform: rotate(-45deg) translate(3px, -3px);
}

/* Mobile menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-slow) var(--ease-out);
}

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

.mobile-menu__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
    text-align: center;
}

.mobile-menu__link {
    font-family: var(--font-secondary);
    font-weight: 600;
    font-size: 32px;
    color: var(--color-black);
    transition: color var(--duration-fast);
}

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

@media (max-width: 768px) {
    .nav__links { display: none; }
    .nav__toggle { display: flex; }
    .nav__inner { padding: var(--space-4) var(--space-6); }
}

/* ============================================
   Hero
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: var(--space-24);
    padding-bottom: var(--space-16);
    position: relative;
}

.hero__grid {
    max-width: var(--grid-max);
    margin: 0 auto;
    padding: 0 var(--space-10);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.hero__label {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--color-blue);
    margin-bottom: var(--space-8);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.hero__label::before {
    content: '';
    width: 32px;
    height: 2px;
    background: var(--color-accent);
}

.hero__title {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: clamp(40px, 5.5vw, 64px);
    line-height: 1.08;
    color: var(--color-black);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-8);
}

.hero__title span {
    display: block;
}

.hero__title--accent {
    color: var(--color-blue);
}

.hero__body {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: 19px;
    line-height: 1.7;
    color: var(--color-gray-500);
    max-width: 480px;
    margin-bottom: var(--space-10);
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero__line {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(33, 60, 99, 0.15) 20%,
        rgba(33, 60, 99, 0.15) 80%,
        transparent 100%
    );
}

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

.hero__diagram {
    width: 100%;
    max-width: 480px;
    aspect-ratio: 1;
    position: relative;
}

.hero__svg {
    width: 100%;
    height: 100%;
}

.svg-path {
    stroke-dasharray: 800;
    stroke-dashoffset: 800;
}

.svg-dot {
    opacity: 0;
}

.svg-accent {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
}

.hero--animated .svg-path {
    animation: drawLine 2s var(--ease-out) 1.2s forwards;
}

.hero--animated .svg-dot {
    animation: dotAppear 0.5s var(--ease-out) 2.8s forwards;
}

.hero--animated .svg-accent {
    animation: drawLine 1s var(--ease-out) 2.4s forwards;
}

.svg-line {
    stroke-dasharray: 480;
    stroke-dashoffset: 480;
}

.hero--animated .svg-line {
    animation: drawLine 1.5s var(--ease-out) 0.6s forwards;
}

@keyframes drawLine {
    to { stroke-dashoffset: 0; }
}

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

@media (max-width: 900px) {
    .hero__grid {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    .hero__visual {
        order: -1;
        max-width: 360px;
    }
    .hero { padding-top: var(--space-32); }
}

@media (max-width: 768px) {
    .hero__grid { padding: 0 var(--space-6); }
    .hero__body { font-size: 17px; }
}

/* --- Buttons --- */
.btn {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 15px;
    letter-spacing: 0.02em;
    padding: var(--space-3) var(--space-8);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-base) var(--ease-out);
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--color-blue);
    color: var(--color-white);
    border: 1px solid var(--color-blue);
}

.btn--primary:hover {
    background: #1a3050;
    border-color: #1a3050;
}

.btn--ghost {
    background: transparent;
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-200);
}

.btn--ghost:hover {
    border-color: var(--color-blue);
    color: var(--color-blue);
}

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

/* ============================================
   Services
   ============================================ */
.services {
    padding: var(--space-32) 0;
    position: relative;
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
}

.service-card {
    padding: var(--space-10);
    position: relative;
    background: rgba(33, 60, 99, 0.02);
    border: 1px solid rgba(33, 60, 99, 0.06);
    transition: all var(--duration-slow) var(--ease-out);
}

.service-card:hover {
    background: rgba(33, 60, 99, 0.05);
    border-color: rgba(33, 60, 99, 0.12);
}

.service-card__line {
    width: 32px;
    height: 2px;
    background: var(--color-accent);
    margin-bottom: var(--space-6);
    transition: width var(--duration-slow) var(--ease-out);
}

.service-card:hover .service-card__line {
    width: 64px;
}

.service-card__title {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 22px;
    color: var(--color-black);
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
}

.service-card__body {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-gray-500);
    max-width: 400px;
}

.service-card__index {
    position: absolute;
    top: var(--space-10);
    right: var(--space-10);
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 13px;
    color: var(--color-gray-200);
    letter-spacing: 0.08em;
}

@media (max-width: 768px) {
    .services__grid {
        grid-template-columns: 1fr;
    }
    .services { padding: var(--space-24) 0; }
    .service-card { padding: var(--space-8); }
}

/* ============================================
   Approach
   ============================================ */
.approach {
    padding: var(--space-32) 0;
    position: relative;
}

.approach__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.approach__lead {
    font-family: var(--font-secondary);
    font-weight: 500;
    font-size: clamp(22px, 2.5vw, 28px);
    line-height: 1.5;
    color: var(--color-black);
    letter-spacing: -0.01em;
}

.approach__principles {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
}

.principle {
    padding: var(--space-6) 0;
}

.principle__marker {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    margin-bottom: var(--space-4);
}

.principle__title {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 18px;
    color: var(--color-black);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.principle__body {
    font-family: var(--font-secondary);
    font-weight: 400;
    font-size: 15px;
    line-height: 1.65;
    color: var(--color-gray-500);
}

.approach__line-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    overflow: hidden;
}

.approach__line-decoration svg {
    width: 100%;
    height: 120px;
    position: absolute;
    bottom: 0;
}

@media (max-width: 900px) {
    .approach__content {
        grid-template-columns: 1fr;
        gap: var(--space-10);
    }
    .approach { padding: var(--space-24) 0; }
}

@media (max-width: 500px) {
    .approach__principles {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Insights
   ============================================ */
.insights {
    padding: var(--space-32) 0;
    background: var(--color-bg-warm);
}

.insights__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.insight-card {
    padding: var(--space-10);
    border: 1px solid rgba(33, 60, 99, 0.06);
    background: var(--color-bg);
    transition: all var(--duration-slow) var(--ease-out);
    position: relative;
    display: flex;
    flex-direction: column;
}

.insight-card:hover {
    border-color: rgba(33, 60, 99, 0.15);
}

.insight-card--featured {
    grid-row: span 2;
    background: var(--color-blue);
    border-color: transparent;
}

.insight-card--featured .insight-card__meta,
.insight-card--featured .insight-card__body {
    color: rgba(255, 255, 255, 0.6);
}

.insight-card--featured .insight-card__title {
    color: var(--color-white);
    font-size: clamp(24px, 2.5vw, 32px);
}

.insight-card--featured .insight-card__tag {
    border-color: rgba(255, 255, 255, 0.25);
    color: rgba(255, 255, 255, 0.7);
}

.insight-card--featured .insight-card__link {
    color: var(--color-accent);
}

.insight-card--featured .insight-card__link::after {
    background: var(--color-accent);
}

.insight-card__accent {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-accent);
}

.insight-card__meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    font-family: var(--font-primary);
    font-size: 13px;
    color: var(--color-gray-400);
}

.insight-card__tag {
    padding: var(--space-1) var(--space-3);
    border: 1px solid var(--color-gray-200);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 11px;
}

.insight-card__title {
    font-family: var(--font-secondary);
    font-weight: 600;
    font-size: 22px;
    line-height: 1.3;
    color: var(--color-black);
    margin-bottom: var(--space-4);
    letter-spacing: -0.01em;
}

.insight-card__body {
    font-family: var(--font-secondary);
    font-size: 15px;
    line-height: 1.65;
    color: var(--color-gray-500);
    margin-bottom: var(--space-6);
    flex: 1;
}

.insight-card__link {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 14px;
    color: var(--color-blue);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    position: relative;
}

.insight-card__link::after {
    content: '';
    width: 0;
    height: 1px;
    background: var(--color-blue);
    position: absolute;
    bottom: -2px;
    left: 0;
    transition: width var(--duration-base) var(--ease-out);
}

.insight-card:hover .insight-card__link::after {
    width: 100%;
}

@media (max-width: 768px) {
    .insights__grid {
        grid-template-columns: 1fr;
    }
    .insight-card--featured { grid-row: span 1; }
    .insights { padding: var(--space-24) 0; }
    .insight-card { padding: var(--space-8); }
}

/* ============================================
   Contact
   ============================================ */
.contact {
    padding: var(--space-32) 0;
}

.contact__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: start;
}

.contact__title {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: clamp(36px, 4.5vw, 52px);
    line-height: 1.1;
    color: var(--color-black);
    margin-top: var(--space-4);
    letter-spacing: -0.02em;
}

.contact__rule {
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    margin: var(--space-8) 0;
}

.contact__body {
    font-family: var(--font-secondary);
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-gray-500);
    max-width: 420px;
}

/* Form */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 13px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-gray-500);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-3) 0;
    font-family: var(--font-secondary);
    font-size: 17px;
    color: var(--color-black);
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--color-gray-200);
    outline: none;
    transition: border-color var(--duration-base) var(--ease-out);
}

.form-input:focus {
    border-bottom-color: var(--color-blue);
}

.form-input--textarea {
    resize: vertical;
    min-height: 100px;
}

@media (max-width: 900px) {
    .contact__content {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    .contact { padding: var(--space-24) 0; }
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-16) 0 var(--space-10);
    border-top: 1px solid rgba(33, 60, 99, 0.1);
}

.footer__inner {
    max-width: var(--grid-max);
    margin: 0 auto;
    padding: 0 var(--space-10);
}

.footer__top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-6);
}

.footer__logo {
    font-family: var(--font-primary);
    font-weight: 500;
    font-size: 20px;
    letter-spacing: 0.08em;
    display: flex;
    align-items: baseline;
    gap: 1px;
}

.footer__tagline {
    font-family: var(--font-secondary);
    font-style: italic;
    font-size: 16px;
    color: var(--color-gray-400);
}

.footer__line {
    width: 100%;
    height: 1px;
    background: rgba(33, 60, 99, 0.1);
    margin: var(--space-8) 0;
}

.footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer__links {
    display: flex;
    gap: var(--space-8);
}

.footer__links a {
    font-family: var(--font-primary);
    font-size: 14px;
    color: var(--color-gray-500);
    transition: color var(--duration-fast);
}

.footer__links a:hover {
    color: var(--color-blue);
}

.footer__legal {
    font-family: var(--font-primary);
    font-size: 13px;
    color: var(--color-gray-400);
}

@media (max-width: 768px) {
    .footer__inner { padding: 0 var(--space-6); }
    .footer__top, .footer__bottom { flex-direction: column; align-items: flex-start; }
}

/* ============================================
   Animations
   ============================================ */
.anim-fade {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
}

.anim-line {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
    display: block;
}

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

/* Scroll reveal */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s var(--ease-out),
                transform 0.7s var(--ease-out);
}

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