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

html {
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img,
svg {
    display: block;
    max-width: 100%;
}

/* ---------- Theme tokens ---------- */
:root {
    --bg: #ffffff;
    --bg-alt: #f4f5f7;
    --surface: #ffffff;
    --border: #e2e4e9;
    --text: #16181d;
    --text-muted: #5b616e;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --shadow: 0 1px 3px rgba(16, 18, 22, 0.08), 0 1px 2px rgba(16, 18, 22, 0.06);
    --bg-gradient: radial-gradient(circle at 15% 0%, rgba(37, 99, 235, 0.10), transparent 55%),
        radial-gradient(circle at 100% 20%, rgba(37, 99, 235, 0.06), transparent 45%),
        linear-gradient(180deg, #ffffff 0%, #f4f5f7 100%);

    --transition-fast: 150ms ease;

    /* Mobile-first type scale — bumped up at the tablet breakpoint below. */
    --fs-h1: 1.75rem;
    --fs-h2: 1.5rem;
    --fs-h3: 1.25rem;
    --fs-h4: 1.125rem;
    --fs-h5: 1rem;
    --fs-body: 1rem;
    --fs-small: 0.875rem;
}

@media (min-width: 640px) {
    :root {
        --fs-h1: 2.5rem;
        --fs-h2: 2rem;
        --fs-h3: 1.5rem;
        --fs-h4: 1.25rem;
        --fs-h5: 1.125rem;
    }
}

:root[data-theme="dark"] {
    --bg: #0f1115;
    --bg-alt: #161922;
    --surface: #1a1d27;
    --border: #2a2e3a;
    --text: #edeef1;
    --text-muted: #9aa0ac;
    --accent: #5b8def;
    --accent-hover: #7ba2f2;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
    --bg-gradient: radial-gradient(circle at 15% 0%, rgba(91, 141, 239, 0.16), transparent 55%),
        radial-gradient(circle at 100% 20%, rgba(91, 141, 239, 0.08), transparent 45%),
        linear-gradient(180deg, #0f1115 0%, #05060a 100%);
}

/* ---------- Base ---------- */
body {
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
    font-size: var(--fs-body);
    background-color: var(--bg);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text);
    line-height: 1.6;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

h1,
h2,
h3,
h4,
h5 {
    font-family: "Poppins", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
    line-height: 1.25;
    font-weight: 700;
}

h1 {
    font-size: var(--fs-h1);
}

h2 {
    font-size: var(--fs-h2);
}

h3 {
    font-size: var(--fs-h3);
}

h4 {
    font-size: var(--fs-h4);
}

h5 {
    font-size: var(--fs-h5);
}

/* ---------- Layout ---------- */
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.25rem;
}

@media (min-width: 640px) {
    main {
        padding: 3rem 2rem;
    }
}

.text-muted {
    color: var(--text-muted);
}

/* ---------- Blog ---------- */
.post-list {
    list-style: none;
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.post-card {
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background-color: var(--surface);
    box-shadow: var(--shadow);
}

.post-card h3 {
    margin-bottom: 0.35rem;
}

.post-card time,
.post time {
    display: block;
    font-size: var(--fs-small);
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.post-card p {
    margin-top: 0.5rem;
    color: var(--text-muted);
}

.post h2 {
    margin: 0.75rem 0 0.25rem;
}

.post-body {
    margin-top: 1.5rem;
}

.post-body > * + * {
    margin-top: 1rem;
}

/* ---------- Admin ---------- */
.error {
    color: #dc2626;
    margin-bottom: 1rem;
}

.admin-auth {
    max-width: 360px;
}

.admin-form {
    display: flex;
    flex-direction: column;
    margin-top: 1.5rem;
}

.admin-form label {
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 0.35rem;
}

.admin-form input[type="text"],
.admin-form input[type="password"],
.admin-form textarea {
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 0.4rem;
    background-color: var(--surface);
    color: var(--text);
    font: inherit;
}

.admin-form textarea {
    resize: vertical;
    font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
    font-size: 0.9rem;
}

.checkbox-label {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    display: flex;
}

.admin-form button,
.button {
    margin-top: 1.5rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 0.4rem;
    background-color: var(--accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    width: fit-content;
    display: inline-block;
}

.admin-form button:hover,
.button:hover {
    background-color: var(--accent-hover);
}

.admin-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    text-align: left;
    padding: 0.6rem 0.5rem;
    border-bottom: 1px solid var(--border);
}

.admin-row-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.link-button {
    background: none;
    border: none;
    padding: 0;
    color: var(--accent);
    cursor: pointer;
    font: inherit;
    text-decoration: underline;
}

.link-button:hover {
    color: var(--accent-hover);
}