@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600&display=swap');

/* ===================================
   6th Workshop on Decentralized Finance (DeFi'27)
   Stylesheet for FC27
   Layout: one light, airy column of soft white panels on a pale neutral ground;
   pink is reserved for links, active states and a few tinted highlights.
   =================================== */

:root {
    /* Pink family */
    --pink: #FF37C7;               /* decorative only: fills, glows, focus rings (fails AA as text) */
    --pink-ink: #C2008F;           /* text and links on white / tint: 5.7:1 and 5.3:1 */
    --pink-deep: #9E0072;          /* emphasis text: 7.8:1 on white */
    --pink-tint: #FFF3FC;          /* highlighted surfaces */
    --pink-wash: rgba(255, 55, 199, 0.08);
    --pink-line: rgba(255, 55, 199, 0.22);

    /* Neutrals */
    --ink: #131313;
    --ink-2: #5E5E5E;              /* secondary text: 6.5:1 on white */
    --ground: #F7F6F7;
    --panel: #FFFFFF;
    --panel-2: #F9F9F9;
    --hairline: #ECEAEC;
    --ok: #0C8911;

    /* Type */
    --font-sans: 'Instrument Sans', -apple-system, system-ui, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, 'Cascadia Mono', 'Roboto Mono', monospace;

    /* Shape */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 999px;
    --shadow-short: 0 1px 6px 2px rgba(0, 0, 0, 0.03), 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-medium: 0 6px 12px -3px rgba(19, 19, 19, 0.06), 0 2px 5px -2px rgba(19, 19, 19, 0.05);

    /* Names used by inline styles in index.html / program.html (kept for compatibility) */
    --primary-color: var(--pink-ink);
    --primary-dark: var(--pink-deep);
    --accent-color: #D1009A;       /* white text on it: 5.0:1 */
    --text-color: var(--ink);
    --text-light: var(--ink-2);
    --bg-color: var(--panel);
    --bg-secondary: var(--panel-2);
    --border-color: var(--hairline);
    --highlight-color: var(--pink-tint);
    --success-color: var(--ok);
    --spacing-unit: 1rem;
    --border-radius: var(--radius-md);
    --box-shadow: var(--shadow-short);
    --box-shadow-hover: var(--shadow-medium);
    color-scheme: light;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--ink);
    background-color: var(--ground);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* Header */
header {
    background:
        radial-gradient(900px 360px at 88% -20%, rgba(255, 55, 199, 0.16), transparent 62%),
        radial-gradient(700px 300px at -5% 120%, rgba(255, 55, 199, 0.07), transparent 60%),
        var(--panel);
    color: var(--ink);
    padding: 3.5rem 0 3rem;
    border-bottom: 1px solid var(--hairline);
}

header h1 {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    line-height: 1.08;
    font-weight: 500;
    letter-spacing: -0.025em;
    margin-bottom: 0.75rem;
    max-width: 18ch;
    text-wrap: balance;
}

header .subtitle {
    font-size: 1.15rem;
    color: var(--ink-2);
    margin-bottom: 1.25rem;
}

header .subtitle a {
    color: var(--pink-ink);
    text-decoration: none;
    border-bottom: 1px solid var(--pink-line);
    transition: border-color 0.2s ease;
}

header .subtitle a:hover {
    border-bottom-color: var(--pink-ink);
}

header .event-details {
    display: inline-block;
    font-size: 0.95rem;
    line-height: 1.7;
    padding: 0.6rem 1rem;
    background-color: var(--pink-tint);
    border: 1px solid var(--pink-line);
    border-radius: var(--radius-md);
}

.logo-section {
    margin-bottom: 1rem;
}

.logo {
    max-height: 80px;
    width: auto;
}

/* Navigation */
nav {
    background-color: rgba(255, 255, 255, 0.86);
    -webkit-backdrop-filter: saturate(160%) blur(10px);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--hairline);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.6rem 0;
}

nav ul li {
    position: relative;
}

nav ul li a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--ink-2);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius-full);
    transition: background-color 0.2s ease, color 0.2s ease;
}

nav ul li a:hover {
    background-color: var(--panel-2);
    color: var(--ink);
    text-decoration: none;
}

nav ul li a.active {
    background-color: var(--pink-wash);
    color: var(--pink-ink);
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--panel);
    min-width: 170px;
    padding: 0.4rem;
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--hairline);
    z-index: 101;
    border-radius: var(--radius-md);
}

.dropdown-content a {
    padding: 0.5rem 0.75rem;
    display: block;
    color: var(--ink);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
}

.dropdown-content a:hover {
    background-color: var(--pink-wash);
    color: var(--pink-ink);
}

.dropdown:hover .dropdown-content,
.dropdown:focus-within .dropdown-content {
    display: block;
}

/* Main Content */
main {
    padding: 2.5rem 0;
    min-height: 60vh;
}

/* .container's padding shorthand overrides main's; restore space under the nav */
main.container {
    padding-top: 1.5rem;
}

/* Card Styles */
.card {
    background-color: var(--panel);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-short);
}

.card h2 {
    color: var(--ink);
    margin-bottom: 1.25rem;
    font-size: 1.75rem;
    line-height: 1.2;
    font-weight: 500;
    letter-spacing: -0.015em;
    text-wrap: balance;
}

.card h3 {
    color: var(--ink);
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.card h4 {
    color: var(--ink);
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
    font-weight: 600;
}

.card p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.card ul {
    margin-left: 1.25rem;
    margin-bottom: 1rem;
}

.card li {
    margin-bottom: 0.4rem;
}

/* Highlight Card */
.highlight-card {
    background:
        radial-gradient(600px 220px at 100% 0%, rgba(255, 55, 199, 0.10), transparent 65%),
        var(--pink-tint);
    border-color: var(--pink-line);
}

/* Important Dates */
.dates-list {
    list-style: none;
    margin-left: 0 !important;
    display: grid;
    gap: 0.5rem;
}

.dates-list li {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.85rem 1.1rem;
    margin-bottom: 0;
    background-color: var(--panel-2);
    border-radius: var(--radius-md);
    font-variant-numeric: tabular-nums;
}

.note {
    color: var(--ink-2);
    font-size: 0.92rem;
    margin-top: 1rem;
}

/* Submission Types */
.submission-types {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1.25rem 0;
}

.submission-type {
    min-width: 0;
    padding: 1.5rem;
    background-color: var(--panel-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--hairline);
    transition: border-color 0.2s ease;
}

.submission-type:hover {
    border-color: var(--pink-line);
}

.submission-info {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background-color: var(--pink-tint);
    border: 1px solid var(--pink-line);
    border-radius: var(--radius-md);
}

/* Topics of Interest: themed groups of short labels */
.topic-groups {
    margin-top: 1.25rem;
    border-top: 1px solid var(--hairline);
}

.topic-group {
    display: grid;
    grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
    gap: 0.75rem 2rem;
    align-items: start;
    padding: 1.1rem 0;
    border-bottom: 1px solid var(--hairline);
}

.card .topic-group h3 {
    margin: 0;
    padding-top: 0.3rem;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--pink-ink);
    letter-spacing: 0;
}

.card .topic-chips {
    list-style: none;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.card .topic-chips li {
    margin: 0;
    padding: 0.35rem 0.85rem;
    background-color: var(--panel-2);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-full);
    font-size: 0.92rem;
    line-height: 1.4;
}

/* Committee Lists */
.committee-list,
.pc-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 0.6rem;
    margin-top: 0.75rem;
}

.committee-member,
.pc-member {
    min-width: 0;
    padding: 0.85rem 1rem;
    background-color: var(--panel-2);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--ink-2);
    font-size: 0.9rem;
    line-height: 1.5;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.committee-member:hover,
.pc-member:hover {
    background-color: var(--panel);
    border-color: var(--pink-line);
}

.committee-member strong,
.pc-member strong {
    color: var(--ink);
    font-weight: 600;
    font-size: 1rem;
}

/* Program Page Styles (kept for compatibility) */
.session {
    margin-bottom: 2rem;
}

.session-header {
    background-color: var(--pink-tint);
    color: var(--pink-ink);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
}

.session-header h3 {
    color: var(--ink);
    margin: 0 0 0.25rem 0;
    font-size: 1.25rem;
}

.session-time {
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.25rem;
}

.session-chair {
    font-size: 0.95rem;
    color: var(--ink-2);
    margin: 0;
}

.paper {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background-color: var(--panel-2);
    border-radius: var(--radius-md);
    transition: background-color 0.2s ease;
}

.paper:hover {
    background-color: var(--pink-tint);
}

.paper-title {
    color: var(--ink);
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

.paper-authors {
    color: var(--ink-2);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.paper-time {
    color: var(--ink);
    font-weight: 600;
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
    margin: 0;
}

.discussion {
    background-color: var(--pink-tint);
    font-weight: 600;
    text-align: center;
}

.break-card {
    background: var(--panel-2);
    text-align: center;
    padding: 1.25rem;
}

.break-card h3 {
    color: var(--ink-2);
    margin: 0 0 0.5rem 0;
}

/* Sponsors */
.sponsors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    align-items: center;
    justify-items: center;
    margin-top: 1.5rem;
}

.sponsor {
    text-align: center;
}

.sponsor-logo {
    max-width: 200px;
    height: auto;
}

/* Links */
a {
    color: var(--pink-ink);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

a:focus-visible {
    outline: 2px solid var(--pink);
    outline-offset: 2px;
    border-radius: 4px;
}

/* PDF Link Styling */
.pdf-link {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.5rem 1.1rem;
    background-color: var(--pink-ink);
    color: #FFFFFF;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.pdf-link:hover {
    background-color: var(--pink-deep);
    color: #FFFFFF;
    text-decoration: none;
}

.paper-item {
    margin-bottom: 1rem;
    padding: 1.25rem;
    background-color: var(--panel-2);
    border-radius: var(--radius-md);
    transition: background-color 0.2s ease;
}

.paper-item:hover {
    background-color: var(--pink-tint);
}

.paper-list {
    margin-top: 1rem;
}

/* Footer */
footer {
    background-color: var(--panel);
    border-top: 1px solid var(--hairline);
    color: var(--ink-2);
    font-size: 0.92rem;
    padding: 2rem 0;
    margin-top: 2rem;
}

footer a {
    color: var(--pink-ink);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Header: Important dates card (status chips set by dates.js) */
.header-grid {
    display: grid;
    gap: 1.75rem;
}

.header-main {
    min-width: 0;
}

.header-dates {
    min-width: 0;
    max-width: 30rem;
    display: grid;
    gap: 0.6rem;
}

@media (min-width: 900px) {
    .header-grid {
        grid-template-columns: minmax(0, 1fr) 25rem;
        gap: 2.5rem;
        align-items: center;
    }
}

.dates-card {
    padding: 1rem 1rem 0.75rem;
    background-color: var(--panel);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-short);
}

.dates-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0 0.35rem 0.5rem;
}

.dates-card-head h2 {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

.aoe-tip {
    position: relative;
    display: inline-block;
}

.aoe-btn {
    font: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--ink-2);
    background-color: var(--panel-2);
    border: 1px solid var(--hairline);
    border-radius: var(--radius-full);
    padding: 0.1rem 0.45rem 0.1rem 0.6rem;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    cursor: help;
    white-space: nowrap;
}

.aoe-btn svg {
    width: 13px;
    height: 13px;
}

.aoe-btn:focus-visible {
    outline: 2px solid var(--pink);
    outline-offset: 2px;
}

.aoe-tip-text {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    z-index: 120;
    width: min(18rem, calc(100vw - 3rem));
    padding: 0.65rem 0.8rem;
    border-radius: var(--radius-sm);
    background-color: var(--ink);
    color: #FFFFFF;
    font-size: 0.8rem;
    line-height: 1.45;
    box-shadow: 0 10px 24px -8px rgba(0, 0, 0, 0.35);
}

.aoe-tip:hover .aoe-tip-text,
.aoe-tip:focus-within .aoe-tip-text,
.aoe-tip.open .aoe-tip-text {
    display: block;
}

.dates-steps {
    list-style: none;
    display: grid;
}

.dates-step {
    position: relative;
    display: grid;
    grid-template-columns: 12px 3.4rem minmax(0, 1fr) auto;
    gap: 0 0.7rem;
    align-items: center;
    padding: 0.5rem 0.4rem;
    border-radius: var(--radius-sm);
}

.dates-step::before {
    content: "";
    position: absolute;
    left: calc(0.4rem + 5px);
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--hairline);
}

.dates-step:first-child::before { top: 50%; }
.dates-step:last-child::before { bottom: 50%; }

.dates-dot {
    position: relative;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--panel);
    border: 2px solid var(--pink-ink);
}

.dates-when {
    display: grid;
    line-height: 1.15;
    font-variant-numeric: tabular-nums;
}

.dates-when b {
    font-size: 0.95rem;
    font-weight: 600;
    white-space: nowrap;
}

.dates-when small {
    font-size: 0.74rem;
    color: var(--ink-2);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.dates-what {
    display: grid;
    min-width: 0;
    line-height: 1.25;
}

.dates-what span {
    font-size: 0.92rem;
    font-weight: 500;
}

.dates-what small {
    font-size: 0.76rem;
    color: var(--ink-2);
}

.dates-chip {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--pink-line);
    color: var(--pink-ink);
    background-color: var(--panel);
    white-space: nowrap;
}

.dates-step[data-status="next"] {
    background-color: var(--pink-tint);
}

.dates-step[data-status="next"] .dates-dot {
    background-color: var(--pink);
    border-color: var(--pink);
    box-shadow: 0 0 0 3px rgba(255, 55, 199, 0.22);
}

.dates-step[data-status="next"] .dates-chip {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #FFFFFF;
}

.dates-step[data-status="next"] .dates-what small {
    color: var(--pink-deep);
    font-weight: 500;
}

.dates-step[data-status="passed"]::before {
    background-color: var(--pink-line);
}

.dates-step[data-status="passed"] .dates-dot {
    background-color: #C9C5C8;
    border-color: #C9C5C8;
}

.dates-step[data-status="passed"] .dates-when b,
.dates-step[data-status="passed"] .dates-when small,
.dates-step[data-status="passed"] .dates-what span,
.dates-step[data-status="passed"] .dates-what small {
    color: #767376;
    font-weight: 500;
}

.dates-step[data-status="passed"] .dates-chip {
    background-color: var(--panel-2);
    border-color: var(--hairline);
    color: #767376;
}

.dates-card-foot {
    margin: 0.5rem 0.35rem 0;
    padding-top: 0.6rem;
    border-top: 1px solid var(--hairline);
    font-size: 0.82rem;
    color: var(--ink-2);
}

.dates-card-foot a {
    font-weight: 600;
}

.dates-cal {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.2rem 0.75rem;
    padding: 0 0.4rem;
    font-size: 0.82rem;
    color: var(--ink-2);
}

.dates-cal a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-weight: 600;
    font-size: 0.88rem;
}

.dates-cal svg {
    width: 14px;
    height: 14px;
    align-self: center;
}

@media (max-width: 480px) {
    .dates-card {
        padding: 0.75rem 0.6rem 0.6rem;
        border-radius: 20px;
    }

    .dates-step {
        grid-template-columns: 12px 3.1rem minmax(0, 1fr) auto;
        gap: 0 0.55rem;
        padding: 0.45rem 0.35rem;
    }

    .dates-step::before {
        left: calc(0.35rem + 5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 2.5rem 0 2rem;
    }

    header .subtitle {
        font-size: 1rem;
    }

    nav ul {
        padding: 0.5rem 0;
    }

    nav ul li a {
        padding: 0.45rem 0.8rem;
        font-size: 0.9rem;
    }

    .dropdown-content {
        right: auto;
    }

    .card {
        padding: 1.5rem;
        border-radius: 20px;
    }

    .card h2 {
        font-size: 1.45rem;
    }

    .submission-types,
    .committee-list {
        grid-template-columns: 1fr;
    }

    .logo {
        max-height: 60px;
    }
}

@media (max-width: 640px) {
    .topic-group {
        grid-template-columns: 1fr;
        gap: 0.6rem;
    }

    .card p {
        text-align: left;
        -webkit-hyphens: manual;
        hyphens: manual;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .card {
        padding: 1.15rem;
    }

    .card h2 {
        font-size: 1.3rem;
    }

    .pc-list {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* Print Styles */
@media print {
    nav {
        display: none;
    }

    .card {
        box-shadow: none;
        page-break-inside: avoid;
    }

    a {
        text-decoration: underline;
    }
}