/*
    COIN Lab — kdeb design system.
    Ported from kdeb/kdeb/css/style.css (Kalyanmoy Deb's personal site).
    Loads after main.css/custom.css and retheme's the existing html5up
    component library (buttons, tables, .features/.posts grids) onto the
    same crimson/gold, Open Sans + Roboto Slab flat design as kdeb's site,
    and replaces the old sidebar layout with a sticky top nav bar.
*/

:root {
    --crimson: #9e1b32;
    --crimson-dark: #7a1526;
    --crimson-light: #c8324a;
    --crimson-wash: #fbeef0;
    --ink: #1a1a1a;
    --ink-soft: #4a4a4a;
    --gray-line: #e3e1de;
    --paper: #ffffff;
    --paper-soft: #faf8f6;
    --gold: #b98a2f;

    --font-body: "Open Sans", -apple-system, "Segoe UI", sans-serif;
    --font-display: "Roboto Slab", Georgia, serif;

    --max-width: 1120px;
    --radius: 10px;
    --shadow-sm: 0 1px 3px rgba(26, 26, 26, 0.08);
    --shadow-md: 0 10px 30px rgba(26, 26, 26, 0.12);
    --transition: 220ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------------------------------------------------------------------
   1. Base typography & color
   ------------------------------------------------------------------ */

body, input, select, textarea {
    font-family: var(--font-body);
    color: var(--ink);
}

body {
    background: var(--paper);
}

h1, h2, h3, h4, h5, h6,
header p,
#header .logo {
    font-family: var(--font-display);
    color: var(--ink);
}

a {
    color: var(--crimson);
    border-bottom: 0;
}

a:hover {
    color: var(--crimson-dark) !important;
    border-bottom-color: transparent;
}

/* ---------------------------------------------------------------------
   2. Buttons (retheme the existing .button/input[type=submit] etc.)
   ------------------------------------------------------------------ */

input[type="submit"],
input[type="reset"],
input[type="button"],
button,
.button {
    border-radius: 999px;
    box-shadow: inset 0 0 0 2px var(--crimson);
    color: var(--crimson) !important;
    font-family: var(--font-body);
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0.02em;
}

input[type="submit"]:hover,
input[type="reset"]:hover,
input[type="button"]:hover,
button:hover,
.button:hover {
    background-color: var(--crimson-wash);
}

input[type="submit"]:active,
input[type="reset"]:active,
input[type="button"]:active,
button:active,
.button:active {
    background-color: var(--crimson-wash);
}

input[type="submit"].primary,
input[type="reset"].primary,
input[type="button"].primary,
button.primary,
.button.primary {
    background-color: var(--crimson);
    color: #fff !important;
}

input[type="submit"].primary:hover,
input[type="reset"].primary:hover,
input[type="button"].primary:hover,
button.primary:hover,
.button.primary:hover {
    background-color: var(--crimson-dark);
}

/* ---------------------------------------------------------------------
   3. Top bar / nav (replaces the old #header + #sidebar layout)
   ------------------------------------------------------------------ */

.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-line);
}

.topbar .container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.topbar .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--ink);
    border-bottom: 0;
}

.topbar .brand:hover {
    color: var(--ink) !important;
}

.topbar .brand img {
    height: 36px;
    width: auto;
}

.topbar .brand-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--ink);
}

.topbar .brand-text strong {
    color: var(--crimson);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    display: inline-block;
    padding: 10px 14px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--ink-soft) !important;
    border-bottom: 0;
    transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--crimson-wash);
    color: var(--crimson) !important;
}

.nav-links a.nav-icon {
    font-size: 1rem;
    padding: 10px 12px;
}

.nav-toggle {
    display: none;
    background: none;
    border: 0;
    box-shadow: none;
    height: auto;
    line-height: normal;
    padding: 6px;
    font-size: 1.4rem;
    color: var(--ink);
    cursor: pointer;
}

@media screen and (max-width: 900px) {

    .topbar .container {
        height: 64px;
    }

    .nav-toggle {
        display: block;
    }

    .nav-links {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--gray-line);
        flex-direction: column;
        align-items: stretch;
        padding: 10px 24px 20px;
        gap: 2px;
        display: none;
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        padding: 12px 14px;
    }
}

/* ---------------------------------------------------------------------
   4. Layout — flat single column (no more sidebar)
   ------------------------------------------------------------------ */

#wrapper {
    display: block;
    min-height: 0;
}

#main {
    width: 100%;
    padding: 0;
}

#main > .inner {
    max-width: var(--max-width);
    padding: 0 24px;
    margin: 0 auto;
}

#main > .inner > section {
    padding: 48px 0 64px;
    border-top: 0;
}

#content > section > header.main {
    background: transparent;
    box-shadow: none;
    padding: 0;
    margin: 32px 0 24px;
    border-bottom: 1px solid var(--gray-line);
    padding-bottom: 20px;
}

#content > section > header.main h1 {
    font-size: clamp(1.8rem, 3.4vw, 2.5rem);
    margin: 0;
}

/* ---------------------------------------------------------------------
   5. Flat cards (.features / .posts grids used across content pages)
   ------------------------------------------------------------------ */

.features article,
.posts article,
body .section {
    background: var(--paper);
    border: 1px solid var(--gray-line);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: none;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.features article:hover,
.posts article:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.features article .icon:after {
    border-color: var(--gray-line);
}

.features article .icon:before,
.posts article h3 a {
    color: var(--crimson);
}

/* ---------------------------------------------------------------------
   6. COIN-specific blocks (director, stats, hero) — flattened, no blur
   ------------------------------------------------------------------ */

.coin-headline {
    color: var(--ink);
}

.coin-kicker {
    display: inline-block;
    font-family: var(--font-body);
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--crimson);
    margin: 0 0 0.75em 0;
}

.coin-lede {
    max-width: 42em;
    font-size: 1.08rem;
    color: var(--ink-soft);
}

#banner {
    background:
        radial-gradient(1100px 500px at 85% -10%, var(--crimson-wash) 0%, rgba(251, 238, 240, 0) 60%),
        var(--paper);
    padding: 56px 24px 40px;
    margin: 0 -24px 24px;
    border-radius: var(--radius);
}

#coin-stats {
    margin: 0 0 40px;
    padding: 0;
}

.coin-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1px;
    background: var(--gray-line);
    border: 1px solid var(--gray-line);
    border-radius: var(--radius);
    overflow: hidden;
}

.coin-stat {
    background: var(--paper);
    padding: 26px 12px;
    text-align: center;
    flex: none;
}

.coin-stat .coin-stat-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.3rem, 2.1vw, 2rem);
    color: var(--crimson);
    text-shadow: none;
    white-space: nowrap;
}

.coin-stat .coin-stat-label {
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: var(--ink-soft);
}

#director {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 3em;
    margin: 0 0 40px;
    padding: 36px;
    border-radius: var(--radius);
    background: var(--paper-soft);
    border: 1px solid var(--gray-line);
}

#director .coin-director-portrait {
    flex: 1 1 18em;
    max-width: 22em;
}

#director .coin-director-portrait img {
    display: block;
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}

#director .coin-director-copy {
    flex: 2 1 24em;
}

#director .coin-director-title {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    color: var(--crimson);
    margin: 0 0 0.75em;
}

@media screen and (max-width: 736px) {
    #banner {
        padding: 40px 20px 28px;
        margin: 0 -20px 20px;
    }

    #director {
        padding: 24px;
        gap: 1.5em;
    }
}

/* ---------------------------------------------------------------------
   6b. Collaboration logo tiles (industry/university partner grids)
   ------------------------------------------------------------------ */

.logo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 16px;
    margin: 0 0 8px;
}

.logo-tile {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 110px;
    padding: 20px;
    background: var(--paper);
    border: 1px solid var(--gray-line);
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.logo-tile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.logo-tile img {
    max-width: 100%;
    max-height: 56px;
    width: auto;
    height: auto;
    object-fit: contain;
}

@media screen and (max-width: 480px) {
    .logo-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .logo-tile {
        height: 90px;
        padding: 14px;
    }

    .logo-tile img {
        max-height: 44px;
    }
}

/* ---------------------------------------------------------------------
   7. Reveal-on-scroll (used by nav.js)
   ------------------------------------------------------------------ */

.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 700ms ease, transform 700ms ease;
}

.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ---------------------------------------------------------------------
   8. Tables & misc accents
   ------------------------------------------------------------------ */

table thead {
    border-bottom: solid 2px var(--gray-line);
}

.badge-new,
img[alt="new.gif"] {
    filter: none;
}

/* ---------------------------------------------------------------------
   9. Technical Reports / Publications archive (ported from kdeb's
      reports.html — search box, year filter, report cards)
   ------------------------------------------------------------------ */

.reports-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    justify-content: space-between;
    background: var(--paper-soft);
    border: 1px solid var(--gray-line);
    border-radius: var(--radius);
    padding: 18px 22px;
    margin-bottom: 36px;
}

.search-box {
    position: relative;
    flex: 1 1 280px;
}

.search-box i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ink-soft);
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 42px;
    border: 1px solid var(--gray-line);
    border-radius: 999px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    background: #fff;
}

.search-box input:focus {
    outline: 2px solid var(--crimson);
    outline-offset: 1px;
}

.year-jump {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.year-jump select {
    padding: 11px 16px;
    border-radius: 999px;
    border: 1px solid var(--gray-line);
    background: #fff;
    font-family: var(--font-body);
    font-size: 0.9rem;
}

.reports-count {
    font-size: 0.86rem;
    color: var(--ink-soft);
}

.report-year-group {
    margin-bottom: 44px;
}

.report-year-heading {
    display: flex;
    align-items: baseline;
    gap: 12px;
    font-family: var(--font-display);
    font-size: 1.6rem;
    color: var(--ink);
    border-bottom: 3px solid var(--crimson);
    padding-bottom: 10px;
    margin-bottom: 18px;
}

.report-year-heading .count {
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--ink-soft);
}

.report-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    align-items: start;
    padding: 18px 0;
    border-bottom: 1px solid var(--gray-line);
    background: transparent;
    border-left: none;
    border-right: none;
    border-top: none;
    border-radius: 0;
}

.report-card:hover {
    transform: none;
    box-shadow: none;
    border-color: transparent;
    border-bottom-color: var(--gray-line);
}

.report-card .title {
    font-weight: 700;
    font-size: 1rem;
    margin: 0 0 4px;
}

.report-card .authors {
    font-size: 0.92rem;
    color: var(--ink-soft);
    margin: 0 0 6px;
}

.report-card .authors strong {
    color: var(--ink);
}

.report-card .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.report-id {
    font-family: "Courier New", Courier, monospace;
    font-size: 0.78rem;
    background: var(--paper-soft);
    border: 1px solid var(--gray-line);
    border-radius: 6px;
    padding: 3px 8px;
    color: var(--ink-soft);
}

.badge-new {
    background: var(--crimson);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: 999px;
    padding: 3px 10px;
}

.report-card .pdf-link {
    align-self: center;
    white-space: nowrap;
    font-weight: 700;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    border: 2px solid var(--crimson);
    border-radius: 999px;
    color: var(--crimson);
}

.report-card .pdf-link:hover {
    background: var(--crimson);
    color: #fff !important;
}

.report-card .no-pdf {
    font-size: 0.8rem;
    color: var(--ink-soft);
    font-style: italic;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--ink-soft);
}

@media screen and (max-width: 736px) {
    .report-card {
        grid-template-columns: 1fr;
    }
}

/* ---------------------------------------------------------------------
   10. Footer
   ------------------------------------------------------------------ */

#footer {
    background: var(--ink);
    color: #cfcfcf;
    padding: 48px 24px 24px;
    margin-top: 40px;
}

#footer .container {
    max-width: var(--max-width);
    margin: 0 auto;
}

#footer h4 {
    color: #fff;
    font-family: var(--font-display);
    font-size: 0.95rem;
    margin-bottom: 12px;
}

#footer a {
    color: #cfcfcf;
}

#footer a:hover {
    color: #fff !important;
}

#footer .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
}

#footer .contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-ua-badge {
    display: inline-block;
    margin-top: 18px;
    padding: 10px 16px;
    background: #fff;
    border-radius: 6px;
}

.footer-ua-badge img {
    display: block;
    height: 28px;
    width: auto;
}

#footer .foot-note {
    border-top: 1px solid #333;
    margin-top: 32px;
    padding-top: 16px;
    font-size: 0.8rem;
    color: #9a9a9a;
}

@media screen and (max-width: 720px) {
    #footer .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}