/* ==========================================================================
   PBVS Workshop - Modern Theme Override
   A clean, professional scientific theme appropriate for IEEE CVPR workshops.
   This file overrides Bootstrap 3 defaults without changing content.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    --color-primary: #4338ca;
    --color-primary-dark: #3730a3;
    --color-primary-light: #e0e7ff;
    --color-primary-50: #eef2ff;
    --color-accent: #6366f1;
    --color-text: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --radius: 10px;
    --radius-lg: 14px;
    --transition: 0.2s ease;
}

/* --------------------------------------------------------------------------
   Base / Global
   -------------------------------------------------------------------------- */
html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif !important;
    color: var(--color-text) !important;
    background-color: var(--color-bg) !important;
    font-size: 15px !important;
    line-height: 1.7 !important;
    padding-top: 70px !important;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif !important;
    font-weight: 700 !important;
    color: var(--color-text) !important;
    line-height: 1.3 !important;
}

h2 {
    font-size: 28px !important;
    margin-top: 30px !important;
}

h5 {
    font-size: 16px !important;
    font-weight: 600 !important;
}

h6 {
    font-size: 13px !important;
    color: var(--color-text-muted) !important;
    font-weight: 500 !important;
}

p {
    color: var(--color-text-secondary);
    line-height: 1.75;
}

a {
    color: var(--color-primary) !important;
    transition: color var(--transition);
}

a:hover,
a:focus {
    color: var(--color-primary-dark) !important;
    text-decoration: none !important;
}

/* --------------------------------------------------------------------------
   Navbar
   -------------------------------------------------------------------------- */
.navbar.navbar-default {
    background: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: none !important;
    border-bottom: 1px solid var(--color-border) !important;
    box-shadow: var(--shadow-sm) !important;
    min-height: 64px !important;
    transition: box-shadow 0.3s ease;
}

.navbar.navbar-default .container {
    display: flex;
    align-items: center;
}

.navbar-brand {
    font-family: 'Inter', sans-serif !important;
    font-weight: 800 !important;
    font-size: 15px !important;
    letter-spacing: 0.02em !important;
    color: var(--color-primary) !important;
    padding: 20px 15px !important;
    transition: opacity var(--transition);
}

.navbar-brand:hover {
    opacity: 0.8;
    color: var(--color-primary-dark) !important;
}

.navbar-nav > li > a {
    font-family: 'Inter', sans-serif !important;
    font-size: 13.5px !important;
    font-weight: 500 !important;
    color: var(--color-text-secondary) !important;
    padding: 22px 13px !important;
    letter-spacing: 0.01em;
    transition: color var(--transition) !important;
    border-bottom: 2px solid transparent;
}

.navbar-nav > li > a:hover,
.navbar-nav > li > a:focus {
    color: var(--color-primary) !important;
    background: transparent !important;
}

.navbar-nav > li.active > a,
.navbar-nav > li.active > a:hover,
.navbar-nav > li.active > a:focus {
    color: var(--color-primary) !important;
    background: transparent !important;
    border-bottom: 2px solid var(--color-primary);
}

/* Mobile toggle */
.navbar-toggle {
    border-color: var(--color-border) !important;
    border-radius: 8px !important;
    margin-top: 15px !important;
}

.navbar-toggle .icon-bar {
    background-color: var(--color-text-secondary) !important;
}

.navbar-toggle:hover,
.navbar-toggle:focus {
    background-color: var(--color-primary-50) !important;
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.section {
    padding: 20px 0 !important;
}

.container {
    max-width: 1140px;
}

/* --------------------------------------------------------------------------
   Panels → Modern Cards
   -------------------------------------------------------------------------- */
.panel {
    background: var(--color-bg-card) !important;
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-md) !important;
    margin-bottom: 24px !important;
    overflow: hidden;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.panel:hover {
    box-shadow: var(--shadow-lg) !important;
}

.panel.panel-primary {
    border-color: var(--color-border) !important;
}

.panel-heading {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent)) !important;
    border: none !important;
    border-radius: 0 !important;
    padding: 16px 24px !important;
}

.panel-title {
    font-family: 'Inter', sans-serif !important;
    font-size: 16px !important;
    font-weight: 600 !important;
    color: #ffffff !important;
    letter-spacing: 0.02em;
}

.panel-body {
    padding: 24px !important;
}

.panel-body p {
    margin-bottom: 12px;
}

/* --------------------------------------------------------------------------
   Lists inside panels
   -------------------------------------------------------------------------- */
#content li,
.panel-body li {
    margin-bottom: 6px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.panel-body ul {
    padding-left: 20px;
}

/* --------------------------------------------------------------------------
   Images
   -------------------------------------------------------------------------- */
.img-responsive {
    border-radius: 8px;
}

.img-circle {
    border: 3px solid var(--color-border) !important;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.img-circle:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

/* Logo on index page */
#pbvs_logo {
    border-radius: 12px;
    margin-bottom: 8px;
}

/* Sponsor logos */
#trimble_logo,
#plusai_logo,
#thales_logo,
#cvf_logo,
#ieee_logo,
#cvpr_logo,
#hensoldt_logo,
#uottawa_logo,
#espol_logo,
#cvc_logo,
#afrl_logo,
#amazon_logo,
#inspirenhealth_logo {
    border-radius: 8px;
    padding: 8px;
    transition: transform 0.2s ease;
    max-height: 70px;
    object-fit: contain;
}

#trimble_logo:hover,
#plusai_logo:hover,
#thales_logo:hover,
#cvf_logo:hover,
#ieee_logo:hover,
#cvpr_logo:hover {
    transform: scale(1.05);
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table-bordered {
    border: 1px solid var(--color-border) !important;
    border-radius: var(--radius) !important;
    overflow: hidden;
}

.table-bordered > tbody > tr > td,
.table-bordered > thead > tr > th {
    border-color: var(--color-border) !important;
    padding: 12px 16px !important;
}

.table-bordered > tbody > tr:hover {
    background-color: var(--color-primary-50) !important;
}

.table-bordered > tbody > tr > td a {
    font-weight: 500;
}

/* --------------------------------------------------------------------------
   Buttons & Links
   -------------------------------------------------------------------------- */
.btn-primary {
    background: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
    border-radius: 8px !important;
    font-weight: 500 !important;
    padding: 10px 24px !important;
    transition: all var(--transition) !important;
}

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

/* --------------------------------------------------------------------------
   Keynote Speaker Cards
   -------------------------------------------------------------------------- */
.section#keynotes .row {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border-light);
}

.section#keynotes .row:last-child {
    border-bottom: none;
}

.section#keynotes .col-md-4 {
    text-align: center;
}

.section#keynotes .col-md-4 .img-circle {
    width: 140px;
    height: 140px;
    object-fit: cover;
    margin: 0 auto 12px auto;
}

.section#keynotes h5 {
    color: var(--color-primary) !important;
    margin-top: 8px;
    margin-bottom: 4px;
}

/* --------------------------------------------------------------------------
   History Page - Speaker Grid
   -------------------------------------------------------------------------- */
.section#datasets .col-md-3 {
    text-align: center;
    margin-bottom: 24px;
    padding: 12px;
}

.section#datasets .col-md-3 .img-circle {
    width: 120px;
    height: 120px;
    object-fit: cover;
    margin: 0 auto 8px auto;
}

.section#datasets .col-md-3 h5 {
    color: var(--color-primary) !important;
    margin-bottom: 2px;
    font-size: 14px !important;
}

.section#datasets .col-md-3 h6 {
    font-size: 12px !important;
    margin-bottom: 4px;
}

.section#datasets .col-md-3 p.text-center {
    font-size: 12px;
    color: var(--color-text-muted);
    line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Organization Page
   -------------------------------------------------------------------------- */
.section#organization .panel-body .row {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border-light);
}

.section#organization .panel-body .row:last-child {
    border-bottom: none;
}

/* --------------------------------------------------------------------------
   Sponsor Section Overrides (call_for_paper.html)
   -------------------------------------------------------------------------- */
.gold-sponsor-badge {
    color: #b45309 !important;
    font-weight: 700 !important;
    font-size: 13px !important;
    letter-spacing: 2px !important;
    text-transform: uppercase !important;
    font-family: 'Inter', sans-serif !important;
}

.sponsor-card {
    border: 2px solid #e5e7eb !important;
    border-radius: var(--radius-lg) !important;
    background: #ffffff !important;
    box-shadow: var(--shadow-sm) !important;
    transition: box-shadow 0.3s ease;
}

.sponsor-card:hover {
    box-shadow: var(--shadow-md) !important;
}

/* --------------------------------------------------------------------------
   Challenge Page
   -------------------------------------------------------------------------- */
.section#announcement p {
    font-size: 16px;
    color: var(--color-text);
}

.section[id^="challenge_"] .panel {
    margin-bottom: 20px;
}

/* Postponed/cancelled challenge styling */
.panel-body[style*="color: #b0b5ba"] {
    opacity: 0.6;
}

/* --------------------------------------------------------------------------
   Footer area spacing
   -------------------------------------------------------------------------- */
body > .section:last-child {
    padding-bottom: 40px !important;
}

/* --------------------------------------------------------------------------
   Sidebar Panels (News, Important Dates, Sponsors, Links, Questions)
   -------------------------------------------------------------------------- */
.col-md-3 > .panel {
    margin-bottom: 20px !important;
}

.col-md-3 > .panel .panel-body {
    padding: 16px 20px !important;
}

.col-md-3 > .panel .panel-body a img {
    margin-bottom: 8px;
}

/* --------------------------------------------------------------------------
   Selection & Focus States
   -------------------------------------------------------------------------- */
::selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .navbar {
        display: none !important;
    }
    body {
        padding-top: 0 !important;
    }
    .panel {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}

/* --------------------------------------------------------------------------
   Responsive Tweaks
   -------------------------------------------------------------------------- */
@media (max-width: 767px) {
    body {
        font-size: 14px !important;
        padding-top: 64px !important;
    }

    .navbar-nav > li > a {
        padding: 12px 15px !important;
        border-bottom: none;
    }

    .navbar-nav > li.active > a {
        border-bottom: none;
        background-color: var(--color-primary-50) !important;
        color: var(--color-primary) !important;
    }

    .navbar-collapse {
        border-top: 1px solid var(--color-border) !important;
        box-shadow: var(--shadow-md);
        background: #fff;
    }

    .panel-body {
        padding: 16px !important;
    }

    .panel-heading {
        padding: 14px 16px !important;
    }

    h2 {
        font-size: 22px !important;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .navbar-nav > li > a {
        font-size: 12px !important;
        padding: 22px 8px !important;
    }
}

/* --------------------------------------------------------------------------
   Smooth Scrolling
   -------------------------------------------------------------------------- */
html {
    scroll-behavior: smooth;
}

/* --------------------------------------------------------------------------
   Scrollbar Styling (Webkit)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}