/* ================================
  CSS VARIABLES
  ================================ */

:root {
    /* Colors - Light Mode */
    --color-text-primary: #080808;
    --color-text-secondary: #555;
    --color-background: #f9f9f9;
    --color-black: #000;
    --color-white: #fff;
    --color-underline: #b4b4b4;

    /* Typography */
    --font-family-base: Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.8rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3.5rem;
    --font-size-sm: 0.9rem;
    --font-size-xs: 0.97rem;

    /* Line Heights */
    --line-height-base: 1.75;
    --line-height-tight: 1.2;
    --line-height-normal: 1.3;
    --line-height-relaxed: 1.35;
    --line-height-button: 1.5;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --header-height: 60px;
    --container-max-width: 1000px;
    --container-max-width-wide: 1150px;
    --content-max-width: 650px;
    --content-max-width-wide: 800px;
    --container-padding: 32px;
    --container-padding-mobile: 20px;

    /* Border Radius */
    --border-radius-sm: 0.125rem;
    --border-radius-base: 0.5rem;
    --border-radius-full: 2rem;
    --border-radius-image: 4px;

    /* Transitions */
    --transition-base: 0.3s ease;
    --transition-slow: 0.8s ease;

    /* Z-Index */
    --z-index-header: 1100;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #f9f9f9;
        --color-text-secondary: #aaa;
        --color-background: #121212;
        --color-black: #fff;
        --color-white: #000;
        --color-underline: #777;
    }
}

/* ================================
   RESET & BASE STYLES
   ================================ */

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-background);
    margin: 0;
    padding: 0;
}

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

/* ================================
   UNIVERSAL STYLES
   ================================ */

* {
    margin: 0;
    padding: var(--spacing-sm) 0;
    text-align: left;
    font-weight: normal;
    color: var(--color-text-primary);
    line-height: var(--line-height-base);
}

/* ================================
   TYPOGRAPHY
   ================================ */

.typography-base,
p {
    font-size: var(--font-size-base);
}

.typography-heading-primary,
h1 {
    font-size: var(--font-size-3xl);
    line-height: var(--line-height-normal);
}

.typography-heading-secondary,
h2 {
    font-size: var(--font-size-2xl);
    line-height: var(--line-height-relaxed);
}

.typography-bold,
b {
    font-weight: bold;
    line-height: inherit;
}

.typography-link,
a {
    text-decoration: underline;
    text-decoration-color: var(--color-underline);
    text-decoration-thickness: var(--border-radius-sm);
    transition: text-decoration-color var(--transition-base);
    line-height: inherit;
}

.typography-link:hover,
a:hover {
    text-decoration-color: var(--color-text-primary);
}

.typography-quote,
blockquote {
    font-size: var(--font-size-base);
    background-color: var(--color-white);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius-base);
    border: var(--color-text-secondary) 0.05rem solid;
}

.typography-list,
ul,
ol {
    list-style-position: outside;
    padding: var(--spacing-sm) var(--spacing-md);
}

.typography-list-item,
ul li,
ol li {
    padding: var(--spacing-xs) 0;
}

/* ================================
   LAYOUT COMPONENTS
   ================================ */

.layout-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    padding-top: var(--header-height);
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .layout-container {
        max-width: 720px;
        padding: 0 var(--container-padding-mobile);
        padding-top: var(--header-height);
    }
}

.layout-page-title {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    line-height: var(--line-height-tight);
}

.layout-page-title h1 {
    font-size: var(--font-size-4xl);
    text-align: center;
    margin: 0;
    padding: 0;
}

/* ================================
   UI COMPONENTS
   ================================ */

/* Button Component */
.button-container {
    display: flex;
    justify-content: center;
    line-height: normal;
}

.button {
    display: inline-block;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-2xl) 0;
    border: 0;
    border-radius: var(--border-radius-full);
    background-color: var(--color-text-primary);
    color: var(--color-white);
    cursor: pointer;
    text-decoration: none;
    line-height: var(--line-height-button);
}

.button:hover {
    background-color: var(--color-text-secondary);
}

/* Header Component */
.header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    background-color: var(--color-background);
    height: var(--header-height);
    z-index: var(--z-index-header);
    padding: 0;
}

.header__container {
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    position: relative;
    max-width: var(--container-max-width-wide);
}

/* Keep header spacing controlled per-section to avoid flex centering artifacts. */

.header__container a {
    text-decoration: none;
}

/* Fix: header social icons spacing and vertical alignment
   The universal selector adds vertical padding site-wide; constrain
   safe overrides here so icons sit neatly without changing globals. */
.header__container a {
    padding: 0;
    /* prevent inherited vertical padding inside header */
}

.header__social-links,
.mobile-menu__social {
    align-items: center;
}

.header__social-links a,
.mobile-menu__social a {
    padding: 0;
    /* remove vertical padding from universal selector */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    color: inherit;
    text-decoration: none;
    /* ensure icon links do not get underlines */
}

/* Keep desktop icons matching header text size; mobile menu keeps its own font-size */
.header__social-links a {
    font-size: inherit;
}

.header__social-links i,
.mobile-menu__social i {
    display: inline-block;
    line-height: 1;
    vertical-align: middle;
}

.header__main-link,
.header__page-links,
.header__social-links,
.header__menu-toggle {
    color: var(--color-text-primary);
    display: flex;
    font-size: var(--font-size-base);
}

.header__page-links {
    gap: 35px;
    margin-left: auto;
    /* push page links toward the right side */
    margin-right: 35px;
    /* keep consistent space between page links and social icons */
}

.header__social-links {
    gap: 24px;
    /* slightly larger gap for visual breathing room */
}

.header__menu-toggle {
    display: none;
}

@media (max-width: 768px) {
    .header__container {
        padding: 0 var(--container-padding-mobile);
    }

    .header__menu-toggle {
        display: block;
        font-size: 1.1rem;
    }

    .header__page-links,
    .header__social-links {
        display: none;
    }
}

/* Mobile Menu Component */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-background);
    transform: translateY(-100%);
    transition: transform var(--transition-slow);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 0;
    padding-top: var(--spacing-2xl);
    margin: 0;
}

.mobile-menu--open {
    transform: translateY(0);
}

.mobile-menu__page {
    display: flex;
    flex-direction: column;
    font-size: var(--font-size-xl);
    align-items: center;
}

.mobile-menu__page a {
    text-decoration: none;
}

.mobile-menu__social {
    display: flex;
    font-size: 1.25rem;
    gap: 20px;
    justify-content: center;
}

/* Footer Component */
.footer {
    height: 100px;
    margin: 0;
    padding: 0;
    bottom: 0;
    left: 0;
}

/* Post List Component */
.post-list {
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
    padding: 0;
    list-style: none;
}

.post-list__item {
    line-height: var(--line-height-base);
    padding-bottom: var(--spacing-xl);
}

.post-list__title {
    font-size: var(--font-size-xl);
    margin: 0;
    padding: 0;
}

.post-list__title a {
    text-decoration: none;
}

.post-list__info {
    font-size: var(--font-size-base);
    margin: 0;
    padding: 0;
}

/* Post Component */
.post {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.post__hero-image {
    width: 100%;
    max-width: var(--content-max-width-wide);
    margin-bottom: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border-radius: var(--border-radius-image);
    overflow: hidden;
    aspect-ratio: 3/2;
    padding: 0;
}

.post__hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: var(--border-radius-image);
    padding: 0;
    margin: 0;
}

.post__title h1 {
    text-align: center;
    margin: 0;
    padding: 0;
    border: 0;
    line-height: var(--line-height-base);
    font-size: var(--font-size-4xl);
}

.post__meta {
    text-align: center;
    margin: var(--spacing-md) 0 0 0;
    padding: 0;
}

.post__subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin: 0 0 var(--spacing-sm) 0;
    padding: 0;
    text-align: center;
}

.post__date {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
    padding: 0;
    text-align: center;
}

.post__content {
    margin-top: var(--spacing-2xl);
}

@media (max-width: 768px) {
    .post__title h1 {
        font-size: 3rem;
    }

    .post__meta {
        max-width: 90%;
        margin: var(--spacing-md) auto 0 auto;
    }

    .post__subtitle {
        font-size: var(--font-size-base);
    }
}

/* Projects Grid Component - Home Layout */
.projects-grid--home {
    display: grid;
    /* Explicit breakpoints: base 1 column, allow 2 columns from 560px, 3 columns from 980px.
     This keeps control over when 2/3 columns are allowed and extends their ranges. */
    grid-template-columns: 1fr;
    gap: 24px;
    margin: var(--container-padding) 0;
}

.project-card--home {
    background: none;
    box-shadow: none;
    padding: 12px;
    text-align: center;
}

.project-card--home__image {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: var(--border-radius-image);
    margin-bottom: 12px;
    border: none;
    box-shadow: none;
}

.project-card--home__title {
    font-weight: bold;
    font-size: 1.1em;
    margin-bottom: 4px;
}

.project-card--home__desc {
    color: #666;
    font-size: var(--font-size-xs);
}

/* Card Grid Component */
.card-grid {
    display: grid;
    /* Explicit breakpoints: base 1 column, allow 2 columns from 560px, 3 columns from 980px. */
    grid-template-columns: 1fr;
    gap: 28px;
    margin: var(--container-padding) 0;
    align-items: start;
    justify-items: start;
}

.card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    background: none;
    box-shadow: none;
    text-decoration: none;
}

.card__image {
    width: 100%;
    aspect-ratio: 3/2;
    border-radius: var(--border-radius-image);
    overflow: hidden;
    margin-bottom: 10px;
    padding: 0;
    margin-top: 0;
}

.card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border: none;
    box-shadow: none;
    background: none;
    padding: 0;
    margin: 0;
}

.card__info {
    padding: 0 4px;
}

.card__title {
    font-size: 1.08em;
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--color-text-primary);
    padding: 0;
}

.card__desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    padding: 0;
}

/* Explicit media queries to control column counts and extend 2/3-column ranges.
   - 1 column: base (mobile)
   - 2 columns: from 560px up
   - 3 columns: from 980px up
   Adjust these breakpoints if you want 2/3 columns to start earlier or later. */
@media (min-width: 400px) {

    .card-grid,
    .projects-grid--home {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 800px) {

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

/* ================================
   PAGE-SPECIFIC STYLES
   ================================ */

/* Responsive video embeds */
.video-wrapper {
    position: relative;
    width: 100%;
    max-width: var(--content-max-width-wide);
    margin: var(--spacing-lg) auto;
    aspect-ratio: 16/9;
}

.video-wrapper iframe,
.post__content iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Fallback for browsers that don't support aspect-ratio */
@supports not (aspect-ratio: 16/9) {
    .video-wrapper {
        padding-top: 56.25%;
        /* 16:9 */
        height: 0;
    }

    .video-wrapper iframe,
    .post__content iframe {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}


/* Error Page Component */
.error-actions {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.helpful-links {
    margin-top: var(--spacing-2xl);
}

.helpful-links h2 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.helpful-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.helpful-links li {
    margin: 0.8rem 0;
    padding: 0;
}

.helpful-links a {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    text-decoration: none;
    border-bottom: 1px solid var(--color-underline);
    transition: border-color var(--transition-base);
}

.helpful-links a:hover {
    border-color: var(--color-text-primary);
}