/* ---------------------------------- */
/* 1. Global Styles          */
/* ---------------------------------- */
:root {
    --color-background: #0a0a0a;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0aec0; /* gray-400 */
    --color-text-tertiary: #718096; /* gray-500 */
    --color-border: #2d3748; /* gray-800 */
    --font-main: 'Pretendard', sans-serif;
}

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

body {
    font-family: var(--font-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--color-background);
    color: var(--color-text-primary);
    cursor: none;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}
.container {
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

@media (min-width: 640px) {
    .container { max-width: 640px; }
}
@media (min-width: 768px) {
    .container { max-width: 768px; }
}
@media (min-width: 1024px) {
    .container {
        max-width: 1280px;
        padding-left: 2rem;
        padding-right: 2rem;
    }
}
@media (min-width: 1280px) {
    .container { max-width: 1280px; }
}


/* ---------------------------------- */
/* 2. Animation & Effects      */
/* ---------------------------------- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 1s ease-out forwards;
}
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

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

/* ---------------------------------- */
/* 3. Custom Cursor         */
/* ---------------------------------- */
.custom-cursor {
    position: fixed;
    left: 0;
    top: 0;
    pointer-events: none;
    border-radius: 50%;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out, width 0.2s ease-out, height 0.2s ease-out;
    z-index: 9999;
    opacity: 0;
}
.cursor-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-text-primary);
    transform: translate(-4px, -4px);
}
.cursor-outline {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    transform: translate(-20px, -20px);
}
body:hover .custom-cursor {
    opacity: 1;
}

/* ---------------------------------- */
/* 4. Components            */
/* ---------------------------------- */

/* Section Base */
.snap-section {
    min-height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-top: 10rem;
    padding-bottom: 10rem;
}
@media (max-width: 768px) {
    .snap-section {
        padding-top: 6rem;
        padding-bottom: 6rem;
    }
}
/* Hero section maintains full height */
.hero {
    min-height: 100vh;
    padding-top: 0;
    padding-bottom: 0;
}

/* Header */
.header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 2rem;
    animation-delay: 0.2s;
}
.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header__logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}
.header__nav {
    display: none;
}
@media (min-width: 768px) {
    .header__nav {
        display: flex;
        align-items: center;
        gap: 2.5rem;
    }
}
.header__nav-link {
    transition: opacity 0.3s;
}
.header__nav-link:hover {
    opacity: 0.75;
}
.header__utils {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.header__utils svg {
    width: 1.25rem;
    height: 1.25rem;
    transition: opacity 0.3s;
}
.header__utils a:hover svg {
    opacity: 0.75;
}

/* Hero Section */
.hero {
    background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)), url('https://images.unsplash.com/photo-1618221195710-dd6b41faaea6?q=80&w=2000&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}
.hero__content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 1rem;
}
.hero__subtitle {
    font-size: 0.875rem;
    letter-spacing: 0.2em;
    animation-delay: 0.4s;
}
.hero__title {
    font-size: 2.25rem;
    font-weight: 600;
    margin: 1rem 0;
    line-height: 1.2;
    animation-delay: 0.6s;
}
@media (min-width: 640px) {
    .hero__title { font-size: 3rem; }
    .hero__title br { display: none; }
}
@media (min-width: 768px) {
    .hero__title { font-size: 3.75rem; }
}
@media (min-width: 1024px) {
    .hero__title { font-size: 4.5rem; }
}
.hero__description {
    margin-top: 1rem;
    font-size: 1.125rem;
    color: #e2e8f0; /* gray-200 */
    animation-delay: 0.7s;
}
.hero__icon-links {
    margin-top: 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    animation-delay: 0.8s;
}
@media (min-width: 640px) {
    .hero__icon-links {
        flex-direction: row;
        gap: 4rem;
    }
}
@media (min-width: 768px) {
    .hero__icon-links {
        margin-top: 5rem;
        gap: 6rem;
    }
}

.icon-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text-primary);
}
.icon-link svg, .icon-link span {
    transition: transform 0.3s ease-in-out, color 0.3s;
}
.icon-link svg {
    width: 4rem;
    height: 4rem;
}
.icon-link span {
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}
.icon-link:hover svg {
    transform: scale(1.1);
    color: #d1d5db; /* gray-300 */
}
.icon-link:hover span {
    transform: translateY(2px);
    color: #d1d5db; /* gray-300 */
}

/* General Section Heading */
.section-header {
    text-align: center;
    margin-bottom: 5rem;
}
.section-header__subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}
.section-header__title {
    font-size: 1.875rem;
    font-weight: 600;
    margin-top: 1rem;
}
@media (min-width: 1024px) {
    .section-header__title { font-size: 2.25rem; }
}
.section-header__description {
    margin-top: 1rem;
    color: var(--color-text-secondary);
    max-width: 42rem; /* max-w-2xl */
    margin-left: auto;
    margin-right: auto;
}

/* Process Section */
.process__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}
@media (min-width: 768px) {
    .process__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 3rem;
    }
}
.process-step {
    position: relative;
    padding: 2rem;
    border-left: 1px solid var(--color-border);
}
.process-step__content {
    position: relative;
}
.process-step__content::before {
    content: attr(data-step);
    position: absolute;
    top: -3.5rem;
    left: -3rem;
    font-size: 6rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.05);
    z-index: 0;
    line-height: 1;
}
.process-step__title {
    font-size: 1.25rem;
    font-weight: 600;
}
.process-step__description {
    margin-top: 1rem;
    color: var(--color-text-secondary);
}

/* Spotlight Section */
.spotlight__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    align-items: center;
}
@media (min-width: 1024px) {
    .spotlight__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
.spotlight__description {
    margin-top: 1.5rem;
    color: #d1d5db; /* gray-300 */
    line-height: 1.75;
}
.spotlight__link {
    display: inline-block;
    margin-top: 2rem;
    border-bottom: 1px solid var(--color-text-tertiary);
    transition: border-color 0.3s;
}
.spotlight__link:hover {
    border-color: var(--color-text-primary);
}
.spotlight__image-wrapper {
    position: relative;
    height: 500px;
}
.spotlight__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.5rem;
    z-index: 10;
}
.spotlight__image-border {
    position: absolute;
    bottom: -1rem;
    right: -1rem;
    width: 100%;
    height: 100%;
    border: 2px solid var(--color-border);
    border-radius: 0.5rem;
}
/* Portfolio Section */
.portfolio {
    width: 100%;
}
.portfolio__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    width: 100%;
}
@media (min-width: 640px) {
    .portfolio__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (min-width: 1024px) {
    .portfolio__grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: auto;
        gap: 1.5rem;
    }
}
.portfolio-item {
    position: relative;
    display: block;
    border-radius: 0.5rem;
    overflow: hidden;
    height: 400px;
    background-color: #2a2a2a;
    min-width: 0;
}
/* First item spans 2 columns on desktop */
@media (min-width: 1024px) {
    .portfolio-item--large {
        grid-column: span 2;
    }
}
.portfolio-item__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}
.portfolio-item:hover .portfolio-item__image {
    transform: scale(1.05);
}
.portfolio-item__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    opacity: 0;
    transition: opacity 0.3s;
    display: flex;
    align-items: flex-end;
    padding: 2rem;
}
.portfolio-item:hover .portfolio-item__overlay {
    opacity: 1;
}
.portfolio-item__title {
    font-size: 1.5rem;
    font-weight: 700;
}
.portfolio-item__subtitle {
    color: #d1d5db; /* gray-300 */
}
.portfolio__cta-button-wrapper {
    text-align: center;
    margin-top: 5rem;
    margin-bottom: 4rem;
}
.portfolio__cta-button {
    display: inline-block;
    background-color: transparent;
    color: var(--color-text-primary);
    padding: 0.75rem 2rem;
    border: 1px solid #4a5568; /* gray-700 */
    border-radius: 9999px;
    transition: background-color 0.3s, color 0.3s;
}
.portfolio__cta-button:hover {
    background-color: var(--color-text-primary);
    color: var(--color-background);
}

/* Testimonials Section */
.testimonials {
    background-color: #000;
    padding-top: 12rem;
    padding-bottom: 12rem;
}
@media (max-width: 768px) {
    .testimonials {
        padding-top: 8rem;
        padding-bottom: 8rem;
    }
}
.testimonials__container {
    text-align: center;
}
.testimonials__blockquote {
    max-width: 56rem; /* max-w-4xl */
    margin-left: auto;
    margin-right: auto;
}
.testimonials__text {
    font-size: 1.875rem;
    font-weight: 600;
    line-height: 1.4;
}
@media (min-width: 1024px) {
    .testimonials__text { font-size: 2.25rem; }
}
.testimonials__author {
    margin-top: 2rem;
    font-size: 1.125rem;
    color: #d1d5db; /* gray-300 */
}

/* Approach Section */
.approach__content {
    max-width: 56rem; /* max-w-4xl */
    margin-left: auto;
    margin-right: auto;
}
.approach-item {
    padding-top: 3rem;
    padding-bottom: 3rem;
    border-top: 1px solid var(--color-border);
}
.approach-item:last-child {
    border-bottom: 1px solid var(--color-border);
}
.approach-item__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: flex-start;
}
@media (min-width: 768px) {
    .approach-item__grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
.approach-item__heading {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
}
@media (min-width: 768px) {
    .approach-item__heading {
        grid-column: span 1 / span 1;
    }
}
.approach-item__number {
    font-size: 1.5rem;
    font-weight: 700;
}
.approach-item__title {
    font-size: 1.25rem;
    font-weight: 600;
}
.approach-item__subtitle {
    color: var(--color-text-tertiary);
}
.approach-item__description {
    color: var(--color-text-secondary);
}
@media (min-width: 768px) {
    .approach-item__description {
        grid-column: span 2 / span 2;
    }
}
/* Footer */
.footer {
    padding-top: 10rem;
    padding-bottom: 10rem;
}
@media (max-width: 768px) {
    .footer {
        padding-top: 6rem;
        padding-bottom: 6rem;
    }
}
.footer__container {
    text-align: center;
}
.footer__email-link {
    display: inline-block;
    margin-top: 2rem;
    font-size: 1.25rem;
    border-bottom: 1px solid var(--color-text-tertiary);
    transition: border-color 0.3s;
}
.footer__email-link:hover {
    border-color: var(--color-text-primary);
}
.footer__bottom {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #1a202c; /* gray-900 */
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}
@media (min-width: 640px) {
    .footer__bottom {
        flex-direction: row;
    }
}
.footer__socials {
    display: flex;
    gap: 1rem;
}
.footer__socials a {
    transition: color 0.3s;
}
.footer__socials a:hover {
    color: var(--color-text-primary);
}