/* ==========================================================================
   APARC Workshop Theme
   Resembling https://aparc-climate.org/
   Clean, modern, and minimalistic styling
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400;1,600&display=swap');

:root {
    --aparc-blue-primary: #0069a9;
    --aparc-blue-deep: #003b71;
    --aparc-blue-hover: #045cb4;
    --aparc-blue-light: #e0f2fe;
    --aparc-blue-subtle: #f0f7ff;
    --aparc-dark: #021420;
    --aparc-text-title: #003b71;
    --aparc-text-body: #1e293b;
    --aparc-text-muted: #64748b;
    --aparc-bg-page: #f8fafc;
    --aparc-bg-card: #ffffff;
    --aparc-border: #e2e8f0;
    --aparc-border-dark: #cbd5e1;
    --aparc-font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Base & Typography */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--aparc-font-sans);
    background-color: var(--aparc-bg-page);
    color: var(--aparc-text-body);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Header (Hero)
   Background image applied to header ONLY
   ========================================================================== */
header {
    position: relative;
    background: linear-gradient(180deg, rgba(2, 20, 32, 0.6) 0%, rgba(0, 45, 87, 0.72) 55%, rgba(2, 20, 32, 0.88) 100%),
                url("../img/atmo-background.jpg") center center / cover no-repeat;
    color: #ffffff;
    text-align: center;
    padding: clamp(3.5rem, 8vw, 6rem) 1.5rem clamp(3rem, 6vw, 4.5rem);
    border-bottom: 3px solid var(--aparc-blue-primary);
    box-shadow: inset 0 -15px 25px rgba(0, 0, 0, 0.25);
}

header h1 {
    font-family: var(--aparc-font-sans);
    font-size: clamp(1.85rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: #ffffff;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
}

header h3 {
    font-family: var(--aparc-font-sans);
    font-size: clamp(1.05rem, 2vw, 1.35rem);
    font-weight: 500;
    line-height: 1.45;
    color: var(--aparc-blue-light);
    letter-spacing: 0.01em;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================================================
   Navigation
   Clean, minimalistic, single-row navbar with bottom accent
   ========================================================================== */
#navbar-parent {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: #ffffff !important;
    border-bottom: 1px solid var(--aparc-border) !important;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
}

.navbar {
    padding: 0;
    background-color: transparent !important;
    width: 100%;
}

.navbar .container-fluid {
    justify-content: center;
    padding: 0 0.5rem;
    max-width: 1200px;
}

.navbar-nav {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    align-items: center;
    margin: 0 auto;
    padding: 0;
    gap: 0;
}

.nav-item {
    padding: 0;
    display: flex;
    align-items: center;
}

.nav-link {
    font-family: var(--aparc-font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: #475569 !important;
    padding: 0.85rem 0.65rem !important;
    border-radius: 0;
    position: relative;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link:hover {
    color: var(--aparc-blue-primary) !important;
    background-color: transparent !important;
}

.nav-link:focus,
.nav-link:focus-visible {
    outline: none !important;
    box-shadow: none !important;
}

.nav-link.active {
    color: var(--aparc-blue-deep) !important;
    font-weight: 700;
    background-color: transparent !important;
    border-bottom: 3px solid var(--aparc-blue-primary);
}

.navbar-toggler {
    border: 1px solid var(--aparc-border);
    padding: 0.4rem 0.65rem;
    border-radius: 6px;
    margin: 0.5rem 0;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(0, 105, 169, 0.2);
    outline: none;
}

@media (max-width: 991.98px) {
    .navbar-collapse {
        padding: 0.75rem 0;
        border-top: 1px solid var(--aparc-border);
    }
    .navbar-nav {
        flex-direction: column;
        align-items: stretch;
        flex-wrap: wrap;
    }
    .nav-link {
        padding: 0.65rem 1rem !important;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    .nav-link.active {
        border-bottom: none;
        border-left: 3px solid var(--aparc-blue-primary);
        background-color: var(--aparc-blue-subtle) !important;
    }
}

/* ==========================================================================
   Main Content & Section Cards
   ========================================================================== */
main {
    flex: 1 0 auto;
}

main.container {
    max-width: 960px;
    padding-top: 2.5rem;
    padding-bottom: 4rem;
}

section {
    background: var(--aparc-bg-card);
    border-radius: 12px;
    border: 1px solid var(--aparc-border);
    box-shadow: 0 4px 24px -2px rgba(15, 23, 42, 0.04);
    padding: clamp(2rem, 5vw, 3.5rem) !important;
    margin-bottom: 2rem;
}

/* Headings in Sections */
section h2 {
    font-family: var(--aparc-font-sans);
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--aparc-blue-deep) !important;
    letter-spacing: -0.01em;
    margin-top: 2.25rem;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--aparc-blue-primary) !important;
}

section h2:first-of-type,
section h2:first-child {
    margin-top: 0 !important;
}

/* Hide empty headings and empty paragraphs */
section h2:empty,
section p:empty {
    display: none;
}

section.text-center h2 {
    display: inline-block;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

section h3 {
    font-family: var(--aparc-font-sans);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--aparc-blue-deep);
    margin-top: 2rem;
    margin-bottom: 0.85rem;
}

section h5 {
    font-family: var(--aparc-font-sans);
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--aparc-text-body);
    line-height: 1.7;
    margin-bottom: 2rem;
}

section p {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--aparc-text-body);
    margin-bottom: 1.25rem;
}

section a {
    color: var(--aparc-blue-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease;
}

section a:hover {
    color: var(--aparc-blue-hover);
    text-decoration: underline;
}

/* ==========================================================================
   Section Specific Details
   ========================================================================== */

/* #general */
#general h5 {
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
}

#general img {
    max-width: 100%;
    width: auto;
    max-height: 130px;
    object-fit: contain;
    margin: 1.5rem auto 2.5rem;
    display: block;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.04));
}

#general ul {
    max-width: 720px;
    margin: 1.5rem auto 2.5rem;
    text-align: left;
    padding-left: 0;
    list-style: none;
}

#general ul li {
    position: relative;
    padding-left: 1.75rem;
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
    color: var(--aparc-text-body);
    line-height: 1.6;
}

#general ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6rem;
    width: 8px;
    height: 8px;
    background-color: var(--aparc-blue-primary);
    border-radius: 50%;
}

#general > p:last-child {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

/* #our-team */
#our-team p {
    font-size: 1.1rem;
    line-height: 2.2;
    color: var(--aparc-text-body);
    font-weight: 500;
    padding-left: 0.25rem;
}

/* #practical-info */
#practical-info table {
    width: 100% !important;
    border-collapse: collapse !important;
    margin: 1.75rem 0 !important;
    border-radius: 8px !important;
    overflow: hidden !important;
    border: 1px solid var(--aparc-border-dark) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

#practical-info table thead tr {
    background-color: var(--aparc-blue-deep) !important;
    color: #ffffff !important;
}

#practical-info table th {
    padding: 14px 18px !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    letter-spacing: 0.02em !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    color: #ffffff !important;
}

#practical-info table td {
    padding: 13px 18px !important;
    border: 1px solid var(--aparc-border) !important;
    color: var(--aparc-text-body) !important;
    font-size: 0.95rem !important;
}

#practical-info table tbody tr:nth-child(even) {
    background-color: var(--aparc-bg-page) !important;
}

#practical-info table tbody tr:hover {
    background-color: var(--aparc-blue-subtle) !important;
}

#practical-info div[style*="border-left"] {
    background-color: var(--aparc-blue-subtle) !important;
    border-left: 5px solid var(--aparc-blue-primary) !important;
    border-radius: 0 8px 8px 0 !important;
    padding: 1.25rem 1.75rem !important;
    margin: 2rem 0 !important;
    color: var(--aparc-blue-deep) !important;
    box-shadow: 0 2px 8px rgba(0, 105, 169, 0.05) !important;
    font-size: 1.05rem !important;
    line-height: 1.65 !important;
}

#practical-info ul {
    padding-left: 1.25rem;
    margin-bottom: 1.5rem;
}

#practical-info ul li {
    margin-bottom: 0.65rem;
    line-height: 1.65;
    color: var(--aparc-text-body);
}

#practical-info ul li strong {
    color: var(--aparc-blue-deep);
}

/* Informational placeholders */
#abstract-submission p,
#programme p,
#registration p,
#sponsorships p,
#guide-for-authors p {
    color: var(--aparc-text-muted);
}

/* ==========================================================================
   Tables & Interactive Components (General / Future)
   ========================================================================== */
.programme-table-container {
    margin: 1.5rem 0;
    overflow-x: auto;
}

.preliminary-programme {
    width: 100%;
    border-collapse: collapse;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--aparc-border-dark);
    font-size: 0.95rem;
}

.preliminary-programme th {
    background-color: var(--aparc-blue-deep);
    color: #ffffff;
    padding: 14px 16px;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.preliminary-programme td {
    padding: 12px 16px;
    border: 1px solid var(--aparc-border);
}

.preliminary-programme tr:nth-child(even) {
    background-color: var(--aparc-bg-page);
}

.preliminary-programme tr:hover {
    background-color: var(--aparc-blue-subtle);
}

.reg-table {
    border-collapse: collapse;
    width: 100%;
    margin: 1.5rem 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--aparc-border-dark);
}

.reg-table th,
.reg-table td {
    border: 1px solid var(--aparc-border);
    padding: 12px 16px;
}

.reg-table th {
    text-align: center;
    background-color: var(--aparc-blue-subtle);
    color: var(--aparc-blue-deep);
    font-weight: 600;
}

.reg-table th:first-child {
    text-align: left;
}

.reg-table td {
    text-align: center;
}

.reg-table td:first-child {
    text-align: left;
}

.reg-table tr:nth-child(even) {
    background-color: var(--aparc-bg-page);
}

.reg-deadline {
    display: block;
    font-weight: normal;
    font-size: 0.85em;
    color: var(--aparc-text-muted);
    margin-top: 3px;
}

.reg-footnote {
    margin-top: 0.75rem;
    font-size: 0.9rem;
    color: var(--aparc-text-muted);
}

.reg-footnote + .reg-footnote {
    margin-top: 0.5rem;
}

.reg-register-link {
    display: inline-block;
    padding: 10px 24px;
    background-color: var(--aparc-blue-primary);
    color: #ffffff !important;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    box-shadow: 0 2px 6px rgba(0, 105, 169, 0.2);
    transition: background-color 0.15s ease, transform 0.15s ease;
}

.reg-register-link:hover {
    background-color: var(--aparc-blue-hover);
    text-decoration: none;
    transform: translateY(-1px);
}

/* ==========================================================================
   Footer
   Minimalist dark footer resembling aparc-climate.org
   ========================================================================== */
footer {
    background-color: var(--aparc-dark);
    color: var(--aparc-text-muted);
    text-align: center;
    padding: 2.25rem 1.5rem;
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

footer p {
    margin: 0;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    color: var(--aparc-text-muted);
}