:root {
    /* spacing & sizes*/
    --nav-height: 96px;
    --default-spacing: 16px;
    --mid-spacing: 64px;
    --base-margins: 64px;
    --hero-width: clamp(300px, 60vw, 1440px);
    --about-width: clamp(300px, 60vw, 1440px);
    --section-width: clamp(300px, 80vw, 1440px);
    --icon-regular: 2rem;
    --icon-large: 3rem;
    --border-radius: 10px;
    --input-height: 54px;
    /* colors */
    --primary: #10A2E6;
    --primary-hover: #117fe5;
    --bg: rgba(0,0,0,0.2);
    --dark: #191919;
    --dark-hover: #272727;
    --light: #d9d9d9;
    --grey: #444444;
    --light-grey: #7a7a7a;
    /* font sizes */
    --subtitle: 1rem;
    --default: 1.125rem;
    --header: 2.5rem;
    /* transitions */
    --transition-speed: 250ms;
}
/* defaults */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

h1,h2,h3,h4,h5,h6 {
    font-weight: 400;
}

a {
    color: var(--primary);
}

hr {
    color: var(--grey);
    border-color: var(--grey);
    margin-top: var(--mid-spacing);
}


/* utils */
.btn {
    padding: var(--default-spacing);
    display: block;
    text-decoration: none;
    background: var(--dark);
    border-radius: var(--border-radius);
    border: 2px solid var(--light);
    color: var(--light);
    cursor: pointer;
    transition: opacity var(--transition-speed) ease, background var(--transition-speed) ease, border-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.btn-dark-filled {
    border-color:transparent;
    background: var(--dark)
}

.btn-nav-mobile {
    border-radius: 0;
    background: transparent;
    border-color:transparent;
    border-bottom: 1px solid var(--primary);
}

.btn-nav-mobile-primary {
    border-radius: 0;
    border-color:transparent;
    background: var(--primary);
    color:var(--dark);
}

.btn.btn-nav-mobile-primary:hover, .btn.btn-nav-mobile-primary:focus {
    background: var(--primary-hover);
}

.btn-dark-outlined {
    border-color: var(--dark);
}

.btn-primary-filled {
    border-color:transparent;
    color: var(--dark);
    background: var(--primary);
}

.btn.btn-primary-filled:disabled {
    border-color:transparent;
    color: var(--light);
    background: var(--grey);
}

/* hover states */
.btn:hover, .btn:focus {
    background: var(--dark-hover);
}
.btn-primary-filled:hover, .btn-primary-filled:focus {
    background: var(--primary-hover);
    color: var(--light);
}

.btn-primary-outlined {
    border-color: var(--primary);
}

.primary {
    color: var(--primary);
}

.flex-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--default-spacing);
    padding: 0;
}

.flex-list-column {
    flex-direction:column;
    gap: 0;
}

.section {
    margin: var(--base-margins) 0;
    display: flex;
    justify-content: center;
}

.section .container {
    width: var(--section-width);
    display: flex;
    flex-direction: column;
    gap: var(--default-spacing);
}

.section .container .title {
    font-size: var(--header);
    margin-bottom: var(--default-spacing);
}

.section .container .title::before {
    content: ">";
    height: var(--icon-regular);
    width: var(--icon-regular);
    margin-right: var(--default-spacing);
    color:var(--primary);
}

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--default-spacing);
    margin-top: var(--default-spacing);
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric .value {
    font-size: var(--header);
}

.metric .value::after {
    content: "+";
    height: var(--icon-regular);
    width: var(--icon-regular);
    color:var(--primary);
}

.pill {
    background: var(--grey);
    border: 1px solid var(--light-grey);
    padding: var(--default-spacing);
    border-radius:25px;
    color: var(--light);
    display: inline-block;
}

input,
textarea {
  padding: var(--default-spacing);
  background: none;
  color: var(--light);
  width: 100%;
  height: 100%;
  border: none;
  outline: none;
  border-bottom: 1px solid grey;
  transition: border-color var(--transition-speed) ease;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

input::placeholder,
textarea::placeholder {
  color: var(--light-grey);
}

input:focus,
textarea:focus {
  border-bottom-color: var(--primary);
}

.icon {
    width: var(--icon-regular);
    height: var(--icon-regular);
    color: var(--light);
    fill: var(--light);
    display: inline-block;
    vertical-align: middle;
}

.icon-xl {
    width: var(--icon-large);
    height: var(--icon-large);
}

/* global bg styling */
body {
    background: #101010;
    background: url("../images/site_bg.webp") repeat-y center top,linear-gradient(180deg, rgba(16, 16, 16, 1) 0%, rgba(32, 32, 32, 1) 50%, rgba(16, 16, 16, 1) 100%);
    font-family: "IBM Plex Mono", monospace;
    font-weight: 400;
    font-size: var(--default);
    font-style: normal;
    color: var(--light);
}

/* main */
main {
    padding: var(--default-spacing);
}

/* nav */
.nav {
    display: flex;
    justify-content:center;
    align-items: center;
    padding: var(--default-spacing) 0;
    background: var(--bg);
    min-height: var(--nav-height);
}

.nav .container {
    display: flex;
    justify-content:space-between;
    align-items: center;
    width: var(--section-width);
}

.nav .title {
    text-decoration: none;
    color: var(--light);
    font-size:var(--header);
}

/* nav-mobile */
.hamburger { 
    background:transparent;
    padding:var(--default-spacing);
    border: none;
    outline: none;
}

.nav.nav-mobile {
    padding:var(--default-spacing);
    display: flex;
    flex-direction:column;
}
.nav.nav-mobile .dropdown {
    display:none;
    transition: transform var(--transition-speed) ease;
    transform:scaleY(0);
    transform-origin: top;
}
.nav.nav-mobile nav {
    display: flex;
    flex-direction:column;
    width:100%;
}

.nav.nav-mobile .container {
    width: 100%;
    display: flex;
    justify-content: space-between;
}

/* hero */
.hero {
    height: clamp(600px, calc(100svh - var(--nav-height)), 820px);
    display:flex;
    justify-content:center;
    align-items:center;
    flex-direction: column;
    text-align: center;
    padding: var(--mid-spacing);
}

.hero .container {
    display: flex;
    flex-direction: column;
    gap: var(--default-spacing);
    justify-content: center;
    align-items: center;
    width: var(--hero-width)
}

/* about */
.about .content {
    width: var(--about-width);
}
/* projects */
.projects ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(
        auto-fit,
        minmax(min(100%, 320px), 1fr)
    );
    gap: var(--default-spacing);
}

.projects img {
    border-radius: var(--border-radius);
    aspect-ratio: 3 / 2;      /* choose one ratio for all cards */
    object-fit: cover;        /* fills box, crops excess */
    width: 100%;
}

.projects .content {
    display: flex;
    flex-direction: column;
    gap: var(--default-spacing);
}

.projects .btn::before {
    content: ">";
    margin-right: var(--default-spacing); 
}

.projects .content p {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    /* Standard property (new spec) */
    line-clamp: 4;
    -webkit-line-clamp: 4; /* number of lines */
    overflow: hidden;
}

.projects ul li {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: var(--default-spacing);
}

/* expertise */
.expertise dl {
    display: flex;
    flex-direction: column;
    gap: var(--default-spacing);
}

/* contact */
.contact .container {
    padding: var(--mid-spacing);
    background: var(--bg);
    border-radius: var(--border-radius);
}

.contact .container form .inputs {
    display: grid;
    grid-template-columns: repeat(
        auto-fit,
        minmax(min(100%, 320px), 1fr)
    );
    gap: var(--default-spacing);
    margin-bottom: var(--default-spacing);
}

.contact .container form > button {
    margin-top: var(--default-spacing);
    width: 100%;
}

/* footer */
.footer {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg);
    padding: var(--default-spacing) 0;
    min-height: var(--nav-height);
}

.footer .container {
    display: flex;
    width: var(--section-width);
    justify-content: space-between;
    align-items: center;
}

/* project-single */
.project-single .breadcrumb li:has(a)::after {
    content: "/";
    margin-left: var(--default-spacing);
}

.project-single section.content h1,
.project-single section.content h2 {
  line-height: 1.25;
  margin-top: var(--mid-spacing);
  margin-bottom: var(--default-spacing);
  font-weight: 600;
}

.project-single section.content h3,
.project-single section.content h4,
.project-single section.content h5,
.project-single section.content h6 {
    margin-top: calc(var(--default-spacing) * 1.5);
    margin-bottom: calc(var(--default-spacing) / 2);
    font-weight: 600;
}

.project-single section.content section:first-child h2 {
    margin-top: var(--default-spacing);
}

/* back to top */
.back-to-top {
    position: fixed;
    right: var(--mid-spacing);
    bottom: calc(var(--default-spacing) + var(--nav-height));
    opacity:0;
}

.back-to-top:hover, .back-to-top:focus {
    opacity:1;
}

/* media queries */
/* Desktops and laptops ----------- */
@media only screen and (max-width: 768px) {
    :root {
        --header: 2rem;
    }

    h1 {
        font-size: var(--header);
    }
}
@media only screen
and (max-width : 1024px) {
/* Styles */
/* nav */
    :root {
        --base-margins: 64px;
        --hero-width: clamp(300px, 100vw, 1440px);
        --about-width: clamp(300px, 100%, 1440px);
        --section-width: clamp(300px, 100vw, 1440px);
        --mid-spacing: 32px;
    }
    .nav { display: none; }
    .nav.nav-mobile { display: flex; } /* if not already */
    footer .container {
        display: flex;
        flex-direction: column;
        padding: var(--default-spacing);
        text-align: center;
        gap: var(--default-spacing);
    }

    .hero .flex-list, footer .flex-list {
        justify-content: center;
    }
}

/* Desktops and laptops ----------- */
@media only screen
and (min-width : 1025px) {
/* Styles */
    .projects ul {
        grid-template-columns: repeat(3, 1fr);
    }

    .nav { display: flex; } /* or flex, whatever it should be */
    .nav.nav-mobile { display: none; }
}