/* ══════════════════════════════════════════════════
   Analog Computing Days '26 — Custom Styles
   ══════════════════════════════════════════════════ */

/* ----- Variables ----- */
:root {
    --primary: #0d81be;
    --primary-dark: #143e8b;
    --section-gap: 5rem;
    --card-radius: 0.75rem;
    --font: 'Inter', system-ui, sans-serif;
}

/* ----- Base ----- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: #1a1a2e;
}

a {
    color: var(--primary);
}

/* ----- Utility ----- */
.py-section {
    padding-top: var(--section-gap);
    padding-bottom: var(--section-gap);
}

.section-header h2 {
    font-size: 2.25rem;
}

.section-header p {
    font-size: 1.1rem;
}

/* ----- Buttons ----- */
.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    transition: background-color 0.2s, transform 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
}

/* ----- Navbar ----- */
#navbar {
    background: transparent;
    transition: background 0.3s, box-shadow 0.3s, padding 0.3s;
    padding: 1rem 0;
}

#navbar .navbar-brand,
#navbar .nav-link {
    color: rgba(255, 255, 255, 0.92);
}

#navbar .navbar-brand {
    font-weight: 700;
    font-size: 1.2rem;
}

#navbar .nav-link {
    font-weight: 500;
    padding: 0.4rem 0.75rem !important;
    transition: color 0.2s;
}

#navbar .nav-link:hover {
    color: #fff;
}

#navbar .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.5);
}

#navbar .navbar-toggler-icon {
    filter: invert(1);
}

#navbar.scrolled {
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.07);
    padding: 0.6rem 0;
    backdrop-filter: blur(8px);
}

#navbar.scrolled .navbar-brand,
#navbar.scrolled .nav-link {
    color: #1a1a2e;
}

#navbar.scrolled .nav-link:hover {
    color: var(--primary);
}

#navbar.scrolled .navbar-toggler {
    border-color: rgba(0, 0, 0, 0.2);
}

#navbar.scrolled .navbar-toggler-icon {
    filter: none;
}

/* ----- Hero ----- */
.hero {
    position: relative;
    min-height: 100vh;
    background-image: url('../assets/images/multiplier.webp');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(20, 62, 139, 0.55) 0%, rgba(13, 129, 190, 0.1) 100%);
}

.hero .container {
    position: relative;
    z-index: 1;
    padding-top: 5rem;
    padding-bottom: 3rem;
}

.hero-logo {
    width: 110px;
    height: 110px;
    object-fit: contain;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.1);
    padding: 4px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(6px);
    color: #fff;
    border-radius: 2rem;
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
}

/* ----- Content Cards (About, Location info) ----- */
.content-card {
    background: #fff;
    border-radius: var(--card-radius);
    border: 1px solid #e8ecf0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* ----- Organizers ----- */
.organizer-card {
    background: #fff;
    border-radius: var(--card-radius);
    border: 1px solid #e8ecf0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.2s, transform 0.2s;
}

.organizer-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.organizer-img {
    width: 130px;
    height: 130px;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid #e8ecf0;
}

/* ----- Schedule ----- */
.schedule-card {
    border-radius: var(--card-radius);
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    background: #fff;
    border: 1px solid #e8ecf0;
}

.schedule-header {
    padding: 1rem 1.5rem;
    color: #fff;
}

.schedule-header--day1 {
    background: var(--primary);
}

.schedule-header--day2 {
    background: var(--primary-dark);
}

.schedule-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.schedule-item {
    display: flex;
    gap: 1rem;
    padding: 0.9rem 1.25rem;
    border-bottom: 1px solid #f0f0f5;
    align-items: flex-start;
}

.schedule-item:last-child {
    border-bottom: none;
}

.schedule-time {
    flex-shrink: 0;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary);
    min-width: 80px;
    padding-top: 2px;
    white-space: nowrap;
}

.schedule-speaker {
    font-weight: 600;
    font-size: 0.9rem;
}

.schedule-title {
    font-size: 0.85rem;
    color: #555;
}

.schedule-break {
    display: block;
    text-align: center;
    padding: 0.5rem 1rem;
    background: #f7f9fc;
    font-size: 0.82rem;
    color: #888;
    border-bottom: 1px solid #f0f0f5;
}

.schedule-highlight {
    display: block;
    padding: 0.9rem 1.25rem;
    background: rgba(13, 129, 190, 0.07);
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

/* ----- Speakers ----- */
.speaker-card {
    background: #fff;
    border: 1px solid #e8ecf0;
    border-radius: var(--card-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
    text-align: center;
    padding: 1.5rem 1rem 1rem;
}

.speaker-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.09);
    transform: translateY(-3px);
}

.speaker-img {
    width: 120px;
    height: 120px;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
    border: 3px solid #e8ecf0;
    display: block;
    margin: 0 auto 0.75rem;
}

.speaker-img--placeholder {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: #f0f4f8;
    color: #adb5bd;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 0.75rem;
    border: 3px solid #e8ecf0;
}

.speaker-body {
    flex: 1;
}

.speaker-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.speaker-affil {
    font-size: 0.82rem;
    color: #555;
    margin-bottom: 0.4rem;
}

.speaker-affil a {
    color: var(--primary);
    text-decoration: none;
}

.speaker-affil a:hover {
    text-decoration: underline;
}

.speaker-talk {
    font-size: 0.82rem;
    color: #666;
    margin-bottom: 0;
    line-height: 1.45;
}

.speaker-talk a {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ----- Location ----- */
.map-wrapper iframe {
    display: block;
}

.venue-photo {
    height: 200px;
    object-fit: cover;
    display: block;
}

/* ----- Registration ----- */
#registration.bg-primary {
    background-color: var(--primary) !important;
}

.sponsor-logo-wrap {
    display: inline-block;
    background: #fff;
    border-radius: 0.5rem;
    padding: 0.6rem 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.sponsor-logo-wrap:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.sponsor-logo {
    height: 44px;
    display: block;
}

/* ----- Accordion (directions) ----- */
.accordion-button:not(.collapsed) {
    color: var(--primary);
    background-color: transparent;
    box-shadow: none;
}

.accordion-button:focus {
    box-shadow: none;
}

.accordion-button::after {
    background-size: 0.85rem;
}