/* ========================================
   DATA FOREST - PORTFOLIO-ALIGNED CSS
   ======================================== */

@font-face {
    font-family: 'Archia';
    src: url('../assets/fonts/Archia-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: 'Archia';
    src: url('../assets/fonts/Archia-Medium.woff') format('woff');
    font-weight: 500;
    font-style: normal;
}

@font-face {
    font-family: 'Archia';
    src: url('../assets/fonts/Archia-SemiBold.woff') format('woff');
    font-weight: 600;
    font-style: normal;
}

@font-face {
    font-family: 'Archia';
    src: url('../assets/fonts/Archia-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
}

:root {
    --bg-primary: #e4e4e4;
    --bg-secondary: #f0f0f0;
    --bg-tertiary: #fbfbfb;
    --text-primary: #2c2c2c;
    --text-secondary: #4a4a4a;
    --text-tertiary: #888888;
    --border-primary: #e0e0e0;
    --border-secondary: #d0d0d0;
    --link-color: #247a45;
    --link-hover: #1b6336;
    --forest-accent: #247a45;
    --forest-soft: rgba(36, 122, 69, 0.12);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.08);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
    --radius-sm: 4px;
    --radius-md: 8px;
    --page-max: 980px;
    --section-max: 760px;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #000000dc;
    --bg-tertiary: #202020;
    --text-primary: #e0e0e0;
    --text-secondary: #c0c0c0;
    --text-tertiary: #888888;
    --border-primary: #404040;
    --border-secondary: #505050;
    --link-color: #67c98a;
    --link-hover: #8bdfa3;
    --forest-accent: #67c98a;
    --forest-soft: rgba(103, 201, 138, 0.14);
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.4);
    --shadow-heavy: rgba(0, 0, 0, 0.6);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 96px;
    scrollbar-gutter: stable;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    font-family: 'Archia', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    transition: background-color 0.8s cubic-bezier(0.45, 0, 0.15, 1),
                color 0.8s cubic-bezier(0.45, 0, 0.15, 1);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.039) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.039) 1px, transparent 1px);
    background-size: 48px 48px;
}

[data-theme="dark"] body::before {
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.044) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.044) 1px, transparent 1px);
}

img,
iframe {
    max-width: 100%;
}

img {
    display: block;
}

a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: color 0.3s ease, border-color 0.3s ease, opacity 0.3s ease;
}

a:hover {
    color: var(--link-hover);
    border-bottom-color: var(--link-hover);
}

code {
    padding: 0.08rem 0.28rem;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.88em;
}

::selection {
    color: var(--bg-secondary);
    background: var(--link-color);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    box-shadow: 0 2px 4px var(--shadow-light);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.8s cubic-bezier(0.45, 0, 0.15, 1),
                border-color 0.8s cubic-bezier(0.45, 0, 0.15, 1);
}

.nav-content {
    width: 100%;
    padding: 15px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.logo {
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.15;
    white-space: nowrap;
    border-bottom: 0;
    transition: opacity 0.3s ease,
                color 0.8s cubic-bezier(0.45, 0, 0.15, 1);
}

.logo:hover {
    color: var(--text-primary);
    opacity: 0.8;
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-links a {
    display: inline-block;
    padding: 8px 16px;
    color: var(--link-color);
    font-size: 0.95rem;
    white-space: nowrap;
    border-bottom: 0;
    border-radius: var(--radius-sm);
}

.nav-links a.portfolio-home-link {
    color: #0066cc;
}

.nav-links a.portfolio-home-link:hover {
    color: #0052a3;
}

[data-theme="dark"] .nav-links a.portfolio-home-link {
    color: #4d9fff;
}

[data-theme="dark"] .nav-links a.portfolio-home-link:hover {
    color: #6db0ff;
}

main {
    min-height: 100vh;
}

/* Hero */
.hero {
    min-height: 92vh;
    width: 100%;
    padding: 24vh 20px 72px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-primary);
    background-image: url('widescreencinematicstill.png');
    background-size: cover;
    background-position: center center;
}

.hero-video {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
    background:
        radial-gradient(circle at 28% 35%, rgba(0, 0, 0, 0.54), rgba(0, 0, 0, 0.18) 28rem, transparent 46rem),
        linear-gradient(180deg, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.05) 42%, rgba(0, 0, 0, 0.44));
}

.hero-overlay {
    display: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: min(100%, 1180px);
    margin: 0 auto;
    color: #ffffff;
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero h1 {
    max-width: 660px;
    margin: 0;
    color: #ffffff;
    font-size: clamp(3.4rem, 10vw, 7.25rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: 0;
    text-transform: uppercase;
    text-shadow: 0 6px 28px rgba(0, 0, 0, 0.62);
    animation: heroTitleSlide 0.85s cubic-bezier(0.2, 0, 0, 1) both;
}

/* Sections */
.section {
    padding: 48px 20px;
}

.section.dark {
    background: transparent;
}

.section-content {
    width: 100%;
    max-width: var(--page-max);
    margin: 0 auto;
}

.intro-section {
    border-top: 0;
}

.text-block {
    max-width: var(--section-max);
    margin: 0 auto 32px;
}

.text-block p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.75;
    text-align: left;
}

.intro-description {
    color: var(--text-primary) !important;
    font-size: 1.08rem !important;
    font-weight: 400;
    line-height: 1.75 !important;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 6px;
    max-width: var(--section-max);
    margin: -16px auto 32px;
}

.tech-tags span {
    color: var(--text-tertiary);
    font-size: 0.78rem;
    font-weight: 500;
    line-height: 1.5;
}

.tech-tags span:not(:last-child)::after {
    content: "/";
    margin-left: 6px;
    color: var(--border-secondary);
}

.hero-media {
    max-width: var(--page-max);
    margin: 0 auto 24px;
}

.explain-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    max-width: var(--page-max);
    margin: 0 auto 24px;
}

.reaction-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.reaction-card {
    display: grid;
    grid-template-columns: minmax(260px, 0.85fr) 1fr;
    gap: 18px;
    align-items: stretch;
    padding: 0;
}

.reaction-card .media-placeholder {
    margin: 0;
    border: 0;
    border-right: 1px solid var(--border-primary);
    border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.reaction-card .media-placeholder img {
    height: 100%;
    min-height: 230px;
    object-fit: cover;
}

.growth-stage-media {
    display: flex;
    align-items: stretch;
}

.growth-stage-grid {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.growth-stage-grid figure {
    min-height: 150px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
}

.growth-stage-grid img {
    flex: 1;
    width: 100%;
    min-height: 0 !important;
    height: 100% !important;
    max-width: none;
    object-fit: contain;
    border-radius: 0;
}

.growth-stage-grid figcaption {
    padding: 7px 8px;
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 700;
    text-align: left;
    text-transform: uppercase;
}

.reaction-card-body {
    padding: 22px 22px 22px 0;
    align-self: center;
}

.reaction-card-body h4 {
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.reaction-card-body p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.94rem;
    line-height: 1.7;
}

.tech-stack-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.explain-card {
    padding: 22px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.level-tag {
    display: inline-block;
    margin-bottom: 12px;
    color: var(--link-color);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.explain-card h3 {
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 1.08rem;
    line-height: 1.25;
}

.explain-card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.65;
}

.flow-diagram {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
}

.flow-step {
    position: relative;
    padding: 16px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
}

.flow-step span {
    display: block;
    margin-bottom: 10px;
    color: var(--link-color);
    font-size: 0.78rem;
    font-weight: 700;
}

.flow-step h4 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.86rem;
}

.flow-step p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.5;
}

.figure-grid,
.placeholder-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.placeholder-grid {
    grid-template-columns: repeat(3, 1fr);
}

.diagram-slot {
    min-height: 170px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    border: 1px dashed var(--border-secondary);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
}

.diagram-slot h4 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.diagram-slot p {
    margin: 0;
    color: var(--text-tertiary);
    font-size: 0.84rem;
    line-height: 1.5;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    max-width: var(--page-max);
    margin: 0 auto 34px;
}

.overview-card {
    padding: 18px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    box-shadow: 0 2px 8px var(--shadow-light);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.overview-card:hover {
    transform: translateY(-3px);
    border-color: var(--link-color);
    box-shadow: 0 6px 16px var(--shadow-medium);
}

.overview-card h2,
.overview-card h3 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 700;
}

.overview-card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.55;
}

.intro-images {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 30px auto 0;
}

.intro-image,
.visual-card,
.resource-card,
.step,
.week-entry {
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    box-shadow: 0 2px 8px var(--shadow-light);
    transition: background-color 0.8s cubic-bezier(0.45, 0, 0.15, 1),
                border-color 0.8s cubic-bezier(0.45, 0, 0.15, 1),
                box-shadow 0.25s ease;
}

.intro-image {
    overflow: hidden;
}

.intro-image img {
    width: 100%;
    height: 190px;
    object-fit: cover;
    border-radius: calc(var(--radius-md) - 1px);
}

.intro-image:hover,
.visual-card:hover,
.resource-card:hover,
.step:hover,
.week-entry:hover {
    box-shadow: 0 6px 16px var(--shadow-medium);
}

.section h2 {
    max-width: var(--section-max);
    margin: 0 auto 28px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-secondary);
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 0;
    text-align: left;
    text-transform: none;
}

@media (min-width: 801px) {
    .section.dark .section-content > h2,
    .section.dark .section-content > .text-block {
        max-width: var(--page-max);
    }
}

/* Legacy optional components */
.visual-grid,
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-top: 32px;
}

.visual-card,
.resource-card {
    padding: 24px;
}

.visual-card h3,
.resource-card h3 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 1.15rem;
    font-weight: 700;
}

.visual-card p,
.resource-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.steps-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 32px;
}

.step {
    display: grid;
    grid-template-columns: 72px 1fr 1fr;
    gap: 20px;
    align-items: center;
    padding: 24px;
}

.step-number {
    color: var(--link-color);
    font-size: 2rem;
    font-weight: 700;
}

.step-content h3 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    text-transform: none;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.65;
}

/* Process and reviews */
.week-entry {
    max-width: var(--page-max);
    margin: 0 auto 24px;
    padding: 28px;
}

.week-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border-primary);
}

.week-header h3 {
    max-width: 720px;
    margin: 0;
    color: var(--text-primary);
    font-size: 1.45rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: 0;
    text-transform: none;
}

.week-date {
    flex-shrink: 0;
    max-width: 220px;
    color: var(--text-tertiary);
    font-size: 0.82rem;
    line-height: 1.4;
    text-align: right;
}

.week-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.week-section h4 {
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 0.86rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.week-section h5 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 700;
}

.week-section p,
.week-section li,
.accomplishment p {
    color: var(--text-secondary);
    font-size: 0.94rem;
    line-height: 1.72;
}

.week-section p,
.accomplishment {
    margin-bottom: 14px;
}

.week-section ul {
    list-style: none;
    padding-left: 0;
}

.week-section li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 8px;
}

.week-section li::before {
    content: '->';
    position: absolute;
    left: 0;
    color: var(--link-color);
    font-weight: 700;
}

.accomplishment {
    padding: 18px;
    border-left: 2px solid var(--link-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: var(--bg-primary);
}

.media-placeholder {
    margin-top: 14px;
    padding: 12px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-tertiary);
    text-align: center;
}

.media-placeholder img {
    width: 100%;
    max-width: 760px;
    height: auto;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.media-placeholder iframe {
    display: block;
    width: 100%;
    border: 0;
    border-radius: var(--radius-md);
}

.media-placeholder video {
    display: block;
    width: 100%;
    max-width: 760px;
    height: auto;
    margin: 0 auto;
    border-radius: var(--radius-md);
    background: #000;
}

.media-placeholder p {
    margin: 10px 0 0;
    color: var(--text-tertiary) !important;
    font-size: 0.82rem !important;
}

/* Footer */
.footer {
    padding: 34px 20px;
    border-top: 1px solid var(--border-primary);
    background: var(--bg-secondary);
    text-align: center;
}

.footer-content p {
    margin: 0;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes heroTitleSlide {
    from {
        opacity: 0;
        transform: translateX(-38px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (max-width: 1200px) {
    .nav-content {
        padding: 15px;
        gap: 15px;
    }

    .logo {
        font-size: 1.8rem;
    }

    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
}

@media (max-width: 1067px) {
    .nav-content {
        padding: 12px 15px;
    }

    .logo {
        font-size: 1.6rem;
    }
}

@media (max-width: 768px) {
    html {
        scroll-padding-top: 76px;
    }

    .nav-content {
        align-items: center;
        flex-direction: column;
        gap: 8px;
    }

    .logo {
        font-size: 1.45rem;
    }

    .nav-links {
        gap: 14px;
        justify-content: center;
    }

    .nav-links a {
        padding: 6px 10px;
        font-size: 0.88rem;
    }

    .hero {
        min-height: 84vh;
        padding: 22vh 15px 52px;
        background-position: center center;
    }

    .hero h1 {
        max-width: 520px;
        font-size: clamp(3rem, 15vw, 5.4rem);
    }

    .section {
        padding: 34px 15px;
    }

    .section h2 {
        font-size: 1.4rem;
        margin-bottom: 22px;
    }

    .text-block {
        margin-bottom: 24px;
    }

    .overview-grid,
    .intro-images,
    .explain-grid,
    .reaction-card,
    .tech-stack-grid,
    .flow-diagram,
    .figure-grid,
    .placeholder-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .reaction-card .media-placeholder {
        border-right: 0;
        border-bottom: 1px solid var(--border-primary);
        border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .reaction-card-body {
        padding: 18px;
    }

    .intro-image img {
        height: auto;
        max-height: 260px;
    }

    .step {
        grid-template-columns: 1fr;
        padding: 20px;
    }

    .week-entry {
        padding: 20px;
        margin-bottom: 20px;
    }

    .week-header {
        flex-direction: column;
        gap: 8px;
    }

    .week-header h3 {
        font-size: 1.18rem;
    }

    .week-date {
        max-width: none;
        text-align: left;
    }

    .accomplishment {
        padding: 14px;
    }
}

@media (max-width: 480px) {
    .nav-content {
        padding: 10px 12px;
    }

    .logo {
        font-size: 1.2rem;
    }

    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        padding: 5px 8px;
        font-size: 0.82rem;
    }

    .hero {
        min-height: 82vh;
        padding: 20vh 12px 38px;
        background-position: center center;
    }

    .section {
        padding: 28px 10px;
    }

    .overview-card,
    .week-entry {
        border-radius: 6px;
    }
}