/* ============================================
   tuba — Personal Art Portfolio
   Stylesheet
   ============================================ */

/* Import modern sans-serif font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* CSS Custom Properties (Color Palette from design) */
:root {
    --color-primary: #7d8f6f;        /* Sage green */
    --color-primary-dark: #6b7d5e;   /* Darker sage */
    --color-secondary: #d4a574;      /* Warm terracotta */
    --color-accent: #e8d5b7;         /* Light cream/tan */
    --color-path: #e8c872;           /* Golden yellow for path section */
    --color-text: #1a1a1a;           /* Near-black text */
    --color-text-light: #4a4a4a;     /* Lighter text */
    --color-bg: #faf8f5;             /* Warm off-white */
    --color-bg-alt: #f0ede7;         /* Alt section bg */
    --color-white: #ffffff;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 0.95rem;
    --font-size-sm: 0.85rem;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.4rem;
    --font-size-xxl: 2rem;
    --font-size-xxxl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2.5rem;
    --spacing-xxl: 4rem;
    --spacing-xxxl: 6rem;
    
    /* Layout */
    --max-width: 1000px;
    --header-height: 56px;
    --border-radius: 4px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    font-weight: 400;
    letter-spacing: 0.01em;
}

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

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

ul {
    list-style: none;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-xl);
    background-color: var(--color-bg);
    height: var(--header-height);
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header__logo-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.header__logo-text {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0.02em;
}

.header__nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.header__nav-list a {
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    transition: color 0.2s ease;
    letter-spacing: 0.02em;
}

.header__nav-list a:hover,
.header__nav-list a:focus {
    color: var(--color-primary);
}

/* Mobile nav toggle */
.header__nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.header__nav-toggle-bar {
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--spacing-xxl);
    padding: var(--spacing-xxxl) var(--spacing-xl) var(--spacing-xxl);
    max-width: var(--max-width);
    margin: 0 auto;
    align-items: center;
}

.hero__name {
    font-size: var(--font-size-xxxl);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    letter-spacing: -0.03em;
}

.hero__tagline {
    font-size: var(--font-size-xl);
    font-weight: 300;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    letter-spacing: 0.01em;
    line-height: 1.3;
}

.hero__intro {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    max-width: 440px;
    line-height: 1.75;
    font-weight: 400;
}

.hero__intro + .hero__intro {
    margin-top: var(--spacing-md);
}

.hero__portrait {
    width: 100%;
    max-width: 380px;
    margin: 0 auto;
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-xxxl) var(--spacing-xl);
    max-width: var(--max-width);
    margin: 0 auto;
}

.section--full {
    max-width: none;
    padding-left: 0;
    padding-right: 0;
}

.section__title {
    font-size: var(--font-size-xxxl);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1.05;
}

.section__subtitle {
    font-size: var(--font-size-lg);
    font-weight: 300;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.4;
}

.section__content p {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.75;
    max-width: 620px;
    font-weight: 400;
}

.section__intro {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    max-width: 620px;
    line-height: 1.75;
    font-weight: 400;
}

.section__closing {
    font-size: var(--font-size-base);
    color: var(--color-text-light);
    margin-top: var(--spacing-xl);
    max-width: 620px;
    line-height: 1.75;
    font-weight: 400;
}

.section__highlight {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: rgba(125, 143, 111, 0.08);
    border-left: 3px solid var(--color-primary);
    max-width: 650px;
}

/* Section backgrounds */
.section--about {
    background-color: var(--color-bg);
}

.section--skills {
    background-color: var(--color-primary);
    color: var(--color-white);
    max-width: none;
    padding-left: 0;
    padding-right: 0;
}

.section--skills .section__title {
    color: var(--color-white);
    margin-bottom: 0;
}

.section--skills .section__intro {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
}

.section--skills .section__closing {
    color: rgba(255, 255, 255, 0.9);
}

.section--skills-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* Skills header row: title left, intro right */
.skills-header {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
    align-items: start;
    margin-bottom: var(--spacing-xl);
}

.skills-header .section__title {
    margin-bottom: 0;
}

.section--portfolio {
    background-color: var(--color-bg);
}

.section--path {
    background-color: var(--color-path);
    color: var(--color-text);
    max-width: none;
    padding-left: 0;
    padding-right: 0;
}

.section--path .section__title {
    color: var(--color-text);
}

.section--path .section__subtitle {
    color: var(--color-text-light);
}

.section--path .section__content p {
    color: var(--color-text);
}

.section--path-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section--collaborators {
    background-color: var(--color-bg);
}

.section--contact {
    background-color: var(--color-secondary);
    color: var(--color-white);
    max-width: none;
    padding-left: 0;
    padding-right: 0;
}

.section--contact .section__title {
    color: var(--color-white);
}

.section--contact .section__subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.section--contact .section__content p {
    color: rgba(255, 255, 255, 0.95);
}

.section--contact-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ============================================
   Skills Grid
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.skill-card {
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
}

.skill-card__title {
    font-size: var(--font-size-base);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.skill-card__text {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.5;
}

/* ============================================
   Portfolio Grid
   ============================================ */
.portfolio-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
    align-items: start;
}

.portfolio-item {
    display: block;
    margin: 0;
}

.portfolio-item a {
    display: block;
    overflow: hidden;
}

.portfolio-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: opacity 0.3s ease;
}

.portfolio-item:hover img {
    opacity: 0.9;
}

.portfolio-item figcaption {
    font-size: 0.78rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
    line-height: 1.5;
    font-weight: 400;
    letter-spacing: 0.01em;
}

.portfolio-item figcaption strong {
    font-weight: 600;
    color: var(--color-text);
}

/* Size variants */
.portfolio-item--wide {
    grid-column: 1 / -1;
}

.portfolio-item--tall img {
    aspect-ratio: 3/4;
    object-fit: cover;
}

.portfolio-item--medium img {
    aspect-ratio: 4/5;
    object-fit: cover;
}

.portfolio-item--square img {
    aspect-ratio: 1/1;
    object-fit: cover;
}

.portfolio-item--landscape img {
    aspect-ratio: 16/9;
    object-fit: cover;
}

.portfolio-item--small {
    max-width: 65%;
}

.portfolio-item--small-right {
    max-width: 65%;
    justify-self: end;
}

.portfolio-item--small-right figcaption {
    text-align: right;
}

/* ============================================
   Contact
   ============================================ */
.contact-info {
    margin-top: var(--spacing-xl);
}

.contact-info__label {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.contact-info__link {
    display: inline-block;
    font-size: var(--font-size-base);
    margin: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 0;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.contact-info__link:hover {
    background-color: rgba(255, 255, 255, 0.25);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    color: var(--color-text-light);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 400;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-xxxl: 2.2rem;
        --font-size-xxl: 1.6rem;
        --font-size-xl: 1.2rem;
        --spacing-xxxl: 3rem;
        --spacing-xxl: 2rem;
    }
    
    .header {
        padding: 0 var(--spacing-md);
    }
    
    .header__nav-toggle {
        display: flex;
    }
    
    .header__nav-list {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-white);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .header__nav-list.active {
        display: flex;
    }
    
    .header__nav-list a {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95rem;
    }
    
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--spacing-xxl) var(--spacing-md);
        gap: var(--spacing-xl);
    }
    
    .hero__intro {
        max-width: none;
        margin: 0 auto;
    }
    
    .section {
        padding: var(--spacing-xxl) var(--spacing-md);
    }
    
    .section--skills-inner,
    .section--path-inner,
    .section--contact-inner {
        padding: 0 var(--spacing-md);
    }
    
    .skills-header {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .portfolio-item--small,
    .portfolio-item--small-right {
        max-width: 100%;
        justify-self: start;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .hero {
        gap: var(--spacing-xl);
    }
    
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}