/* ==========================================================================
   ZPHILOSO — AI Consultancy
   Aesthetic: Japanese Minimalism meets Editorial Typography
   ========================================================================== */

:root {
    --color-ink: #1a1a1a;
    --color-paper: #f5f3ef;
    --color-stone: #8a8578;
    --color-mist: #e8e5df;
    --color-accent: #c4a35a;

    --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;

    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 8rem;
    --space-2xl: 12rem;
}

/* Reset & Base
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-weight: 300;
    line-height: 1.7;
    color: var(--color-ink);
    background-color: var(--color-paper);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* Film grain overlay */
.grain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

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

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

/* Header
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-md) var(--space-lg);
    z-index: 100;
    mix-blend-mode: difference;
}

.logo {
    display: block;
}

.logo-img {
    height: 24px;
    width: auto;
    filter: invert(1);
}

/* Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: end;
    padding: var(--space-xl) var(--space-lg) var(--space-lg);
    position: relative;
}

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

.hero-title {
    font-size: clamp(2.5rem, 8vw, 6rem);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.hero-title .line {
    display: block;
}

.hero-title .quiet {
    color: var(--color-stone);
    font-style: italic;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--color-stone);
    max-width: 400px;
}

.hero-aside {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    display: flex;
    gap: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--color-stone);
    padding-bottom: var(--space-sm);
}

/* Section Numbers */
.section-num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--color-stone);
    display: block;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-ink);
}

/* Services Section
   ========================================================================== */

.services {
    padding: var(--space-2xl) var(--space-lg);
    border-top: 1px solid var(--color-mist);
}

.services-header {
    margin-bottom: var(--space-xl);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.service-card {
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-ink);
    transition: transform 0.4s ease;
}

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

.service-title {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 0.95rem;
    color: var(--color-stone);
    line-height: 1.8;
}

/* Philosophy Section
   ========================================================================== */

.philosophy {
    padding: var(--space-2xl) var(--space-lg);
    background-color: var(--color-ink);
    color: var(--color-paper);
    position: relative;
    overflow: hidden;
}

.philosophy::before {
    content: '';
    position: absolute;
    top: 50%;
    right: 10%;
    width: 300px;
    height: 300px;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    transform: translateY(-50%);
}

.philosophy .section-num {
    color: var(--color-stone);
}

.philosophy-content {
    max-width: 700px;
    position: relative;
    z-index: 1;
}

.philosophy-quote {
    margin: var(--space-lg) 0;
}

.philosophy-quote p {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.philosophy-sub {
    font-size: 1rem;
    color: var(--color-stone);
    max-width: 450px;
}

/* Global Philosophies Section
   ========================================================================== */

.global-philosophies {
    padding: var(--space-2xl) var(--space-lg);
    background-color: var(--color-paper);
}

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

.philosophy-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.card-image-wrapper {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    background-color: var(--color-mist);
    margin-bottom: var(--space-sm);
    position: relative;
}

.card-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    mix-blend-mode: multiply; /* Blends the image with the paper background */
    filter: sepia(0.2) contrast(0.9); /* Adds a subtle vintage tech feel */
    transition: transform 0.6s ease;
}

.philosophy-card:hover .card-image {
    transform: scale(1.05);
}

.card-kicker {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-ink);
}

.card-desc {
    font-size: 0.9rem;
    color: var(--color-stone);
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .global-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-lg);
    }
}

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

/* Z Section
   ========================================================================== */

.z-section {
    background-color: var(--color-ink);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60vh;
    width: 100%;
}

.z-mark {
    height: 90%;
    width: auto;
    opacity: 0.2;
    filter: invert(1);
}

/* Contact Section
   ========================================================================== */

.contact {
    padding: var(--space-2xl) var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-xl);
    border-top: 1px solid var(--color-mist);
}

.contact-text {
    font-size: 1.125rem;
    color: var(--color-stone);
    margin-bottom: var(--space-lg);
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-link {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-mist);
    transition: padding-left 0.3s ease, border-color 0.3s ease;
}

.contact-link:hover {
    padding-left: var(--space-sm);
    border-color: var(--color-ink);
}

.link-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-stone);
}

.link-value {
    font-size: 1.25rem;
    font-weight: 400;
}

/* Footer
   ========================================================================== */

.footer {
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--color-mist);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.footer-logo {
    height: 18px;
    width: auto;
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

.footer-logo:hover {
    opacity: 1;
}

.footer-text {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--color-stone);
}

/* Subtle Animations
   ========================================================================== */

/* Staggered entrance for hero text */
.hero-title .line {
    opacity: 0;
    transform: translateY(30px);
    animation: revealLine 0.8s ease forwards;
}

.hero-title .line:nth-child(1) { animation-delay: 0.1s; }
.hero-title .line:nth-child(2) { animation-delay: 0.25s; }
.hero-title .line:nth-child(3) { animation-delay: 0.4s; }

.hero-desc {
    opacity: 0;
    transform: translateY(20px);
    animation: revealLine 0.8s ease forwards;
    animation-delay: 0.6s;
}

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

/* Service cards stagger on scroll - uses Intersection Observer in JS, fallback visible */
.service-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Philosophy quote reveal */
.philosophy-quote p {
    opacity: 0;
    animation: revealLine 1s ease forwards;
    animation-delay: 0.2s;
}

/* The surprise: a subtle cursor trail effect on the philosophy quote */
.philosophy-quote p {
    position: relative;
    cursor: crosshair;
}

/* Responsive
   ========================================================================== */

@media (max-width: 1024px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 5rem;
        --space-2xl: 8rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .contact {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

}

@media (max-width: 768px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 4rem;
        --space-2xl: 6rem;
    }

    .hero {
        grid-template-columns: 1fr;
        padding-top: var(--space-2xl);
    }

    .hero-aside {
        writing-mode: horizontal-tb;
        position: absolute;
        top: var(--space-xl);
        right: var(--space-lg);
    }

    .header {
        padding: var(--space-sm) var(--space-lg);
    }

    .logo {
        flex-direction: column;
        gap: 0.25rem;
    }

    .philosophy::before {
        display: none;
    }
}

/* Print Styles
   ========================================================================== */

@media print {
    .grain { display: none; }
    .header { position: static; mix-blend-mode: normal; }
    .logo-text, .logo-sub { color: var(--color-ink); }
}