:root {
    --cream: #f5f0e6;
    --navy: #24365c;
    --navy-light: #3a5285;
    --muted: #5c6478;
    --ok: #2e7d4f;
    --bad: #b3372f;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 3rem 1.5rem;
    background: var(--cream);
    color: var(--navy);
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
    font-size: 1.05rem;
    line-height: 1.6;
}

header, main, footer {
    max-width: 40rem;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.25rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--navy);
}

.face {
    order: 1;
    width: 7rem;
    height: 7rem;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

h1 {
    margin: 0 0 0.25rem;
    font-size: 2.25rem;
    font-weight: 600;
}

.tagline {
    margin: 0;
    color: var(--muted);
}

main {
    padding: 2rem 0;
}

section + section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--navy);
}

h2 {
    margin: 0 0 0.5rem;
    font-size: 1.35rem;
    font-weight: 600;
}

p {
    margin: 0;
}

ul {
    margin: 0;
    padding-left: 1.25rem;
}

a {
    color: var(--navy);
    text-decoration: underline;
    text-underline-offset: 3px;
}

a:hover {
    color: var(--navy-light);
}

footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--navy);
    color: var(--muted);
    font-size: 0.9rem;
}

dialog {
    position: relative;
    max-width: 24rem;
    padding: 1.5rem 2.5rem 1.5rem 1.5rem;
    border: 2px solid var(--navy);
    background: var(--cream);
    color: var(--navy);
}

dialog::backdrop {
    background: rgba(36, 54, 92, 0.6);
}

/* Hidden in plain sight: williloo{c4sc4d1ng_s3cr3t_sh33ts} */

/* Fade + slide the popup and fade the backdrop, both on open and close. */
dialog,
dialog::backdrop {
    transition:
        opacity 0.35s ease,
        transform 0.35s ease,
        overlay 0.35s allow-discrete,
        display 0.35s allow-discrete;
}

dialog {
    opacity: 0;
    transform: translateY(0.75rem);
}

dialog::backdrop {
    opacity: 0;
}

dialog[open] {
    opacity: 1;
    transform: none;
}

dialog[open]::backdrop {
    opacity: 1;
}

@starting-style {
    dialog[open] {
        opacity: 0;
        transform: translateY(0.75rem);
    }

    dialog[open]::backdrop {
        opacity: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    dialog,
    dialog::backdrop {
        transition: none;
    }
}

dialog h2 {
    margin-bottom: 0.75rem;
}

dialog .ip-line {
    margin-top: 0.75rem;
    text-align: center;
    font-size: 1.25rem;
}

dialog .close {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 2rem;
    height: 2rem;
    padding: 0;
    border: 0;
    background: none;
    color: var(--navy);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
}

dialog .close:hover {
    color: var(--navy-light);
}

dialog:focus {
    outline: none;
}

.timeline {
    list-style: none;
    margin: 1.25rem 0 0;
    padding: 0 0 0 1.5rem;
    border-left: 2px solid var(--navy);
}

.timeline > li {
    position: relative;
    padding-bottom: 1.25rem;
}

.timeline > li:last-child {
    padding-bottom: 0;
}

.timeline > li::before {
    content: "";
    position: absolute;
    top: 0.45rem;
    left: calc(-1.5rem - 6px);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--navy);
}

.timeline .when {
    display: block;
    color: var(--muted);
    font-size: 0.85rem;
}

.timeline strong {
    font-weight: 600;
}

.timeline ul {
    margin-top: 0.4rem;
}

/* secret ctf */
.challs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
    gap: 0.75rem;
    margin: 1rem 0;
}

.chall {
    position: relative;
    padding: 0.85rem 1rem;
    border: 2px solid var(--navy);
    border-radius: 0.5rem;
    background: var(--cream);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.chall h3 {
    margin: 0 0 0.25rem;
    font-size: 1rem;
    font-weight: 600;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-bottom: 0.45rem;
}

.tags span {
    padding: 0.05rem 0.45rem;
    border: 1px solid var(--navy);
    border-radius: 999px;
    color: var(--navy);
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.chall p {
    color: var(--muted);
    font-size: 0.85rem;
    line-height: 1.4;
}

.chall .file {
    display: inline-block;
    margin-top: 0.6rem;
    padding: 0.2rem 0.6rem;
    border: 1px solid var(--navy);
    border-radius: 0.35rem;
    color: var(--navy);
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.75rem;
    text-decoration: none;
}

.chall .file:hover {
    background: var(--navy);
    color: var(--cream);
}

.chall.solved {
    border-color: var(--ok);
    background: rgba(46, 125, 79, 0.08);
}

.chall.solved::after {
    content: "\2713";
    position: absolute;
    top: 0.5rem;
    right: 0.7rem;
    color: var(--ok);
    font-weight: 600;
}

.flag-form {
    display: flex;
    gap: 0.5rem;
}

.flag-form input {
    flex: 1;
    min-width: 0;
    padding: 0.55rem 0.9rem;
    border: 2px solid var(--navy);
    border-radius: 999px;
    background: var(--cream);
    color: var(--navy);
    font: inherit;
    transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}

.flag-form input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(36, 54, 92, 0.2);
}

.flag-form input::placeholder {
    color: var(--muted);
    opacity: 0.7;
}

.flag-form button {
    padding: 0.55rem 1.1rem;
    border: 2px solid var(--navy);
    border-radius: 999px;
    background: var(--navy);
    color: var(--cream);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.flag-form button:hover {
    background: var(--navy-light);
    border-color: var(--navy-light);
}

/* correct: green flash + pulse; wrong: red flash + shake */
.flag-form.correct input {
    border-color: var(--ok);
    background: rgba(46, 125, 79, 0.1);
    box-shadow: 0 0 0 3px rgba(46, 125, 79, 0.25);
    animation: flag-pulse 0.6s ease;
}

.flag-form.wrong input {
    border-color: var(--bad);
    background: rgba(179, 55, 47, 0.08);
    box-shadow: 0 0 0 3px rgba(179, 55, 47, 0.2);
    animation: flag-shake 0.4s ease;
}

@keyframes flag-pulse {
    0%   { transform: scale(1); }
    40%  { transform: scale(1.02); }
    100% { transform: scale(1); }
}

@keyframes flag-shake {
    0%, 100% { transform: translateX(0); }
    20%      { transform: translateX(-6px); }
    40%      { transform: translateX(6px); }
    60%      { transform: translateX(-4px); }
    80%      { transform: translateX(4px); }
}

@media (prefers-reduced-motion: reduce) {
    .flag-form input {
        animation: none !important;
    }
}