/* Class 16: Step 3: padding counts inside width, not on top of it */
* {
    box-sizing: border-box;
}

/* Class 11: Step 4: the basics */

:root {
    --text: #25233A;
    --text-muted: #66647A;
    --accent: #6554C0;
    --background: #F8F7FC;
    --border: #e5e7eb;
    --error: crimson;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--background);
    line-height: 1.6;
    max-width: 42rem;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

h1 {
    font-size: 3rem;           /* Class 12: Step 2: my own scale */
    line-height: 1.1;
    margin-bottom: 0.25rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-top: 0;
}

h2 {
    font-size: 1.75rem;
    line-height: 1.2;
    margin-top: 2.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

p {
    font-size: 1.05rem;
    margin-bottom: 1rem;
}

/* Lab 12: Task 3: footer*/
/* Lab 14: Task 4: footer stacks on narrow screens */
footer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

@media (min-width: 40rem) {
    footer {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* Lab 11: Task 4: links */
a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

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

.portrait {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 50%;
}

section {
    margin-bottom: 3rem;
}

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

li {
    margin-bottom: 0.75rem;
    padding-left: 1rem;
    border-left: 2px solid var(--accent);
}

/* Lab 12: Task 1: header side by side */
header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Class 13: Step 3: the nav bar */
nav a {
    text-decoration: none;
    font-weight: 700;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
}

/* Lab 13: Task 5: highlight nav links when hovering */
nav a:hover {
    background: var(--border);
}

/* Lab 13: Task 1: which page am I on */
nav a.current {
    border-bottom-color: var(--accent);
    color: var(--accent);
}

/* Lab 13: Task 4: separate the bar from the header */
nav {
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}

/* Class 14: Step 2: the cards go in a row */
/* Class 14: Step 3: stack by default */
.cards {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.card {
    flex: 1 1 18rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
}

/* Class 14: Step 3: a row when there's room */
@media (min-width: 40rem) {
    .cards {
        flex-direction: row;
    }
}

/* Lab 14: Task 1: the nav stacks on narrow screens */
nav ul {
    list-style: none;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

@media (min-width: 40rem) {
    nav ul {
        flex-direction: row;
        gap: 1.5rem;
    }
}

/* Lab 14: Task 5: break your own page */

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

header {
    flex-wrap: wrap;
}

body.dark {
    --text: white;
    --text-muted: silver;
    --accent: skyblue;
    --background: black;
    --border: dimgray;
    --error: lightsalmon;
}

/* Class 16: Step 3: the form */
form label {
    display: block;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

form input, form textarea {
    font: inherit;
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    scroll-padding-block-start: 6px;
    background: var(--background);
    color: var(--text);
}

form input:focus, form textarea:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

form button {
    font: inherit;
    font-weight: 700;
    color: var(--background);
    background: var(--accent);
    border: none;
    border-radius: 6px;
    padding: 0.75rem 1.4rem;
    cursor: pointer;
}

#form-status {
    font-weight: 700;
    color: var(--accent);
}

/* Lab 16: Task 1: the error state */
#form-status.error {
    color: var(--error);
}

/* Class 18: Step 2: the honeypot, hidden from people */
.hidden-field {
    display: none;
}