:root {
    --pumpkin: #ff8050;
    --blob: #fd8;
    --matte-black: #28282B;

    /* Light mode colors - with purple-orange-blue gradient feel */
    --accent: var(--pumpkin);
    --bg-gradient-start: #e8d7f5;      /* Soft purple */
    --bg-gradient-end: #fff0d6;        /* Soft orange */
    --bg-gradient-mid: #d4e8f7;        /* Soft blue */
    --navbar-bg: rgba(232, 107, 142, 0.15);
    --navbar-border: rgba(255, 128, 80, 0.3);
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-shadow: rgba(232, 107, 142, 0.15);
    --text-primary: #333;
    --text-secondary: #666;
    --link-color: #09f;
    --logout-color: #f66;
    --chat-bg: #fafbff;
    --chat-border: #e0d4eb;
    --chat-message-bg: #f9f7ff;
    --footer-bg: transparent;
    --footer-text: #666;
}

/* Dark mode colors */
[data-theme="dark"] {
    --accent: var(--blob);
    --bg-gradient-start: #2a1a3d;      /* Deep purple */
    --bg-gradient-end: #3d2817;        /* Deep orange */
    --bg-gradient-mid: #1a2a3d;        /* Deep blue */
    --navbar-bg: rgba(40, 40, 43, 0.9);
    --navbar-border: rgba(255, 128, 80, 0.3);
    --card-bg: rgba(42, 42, 53, 0.85);
    --card-shadow: rgba(232, 107, 142, 0.2);
    --text-primary: #e0e0e0;
    --text-secondary: #ccc;
    --link-color: #4da6ff;
    --logout-color: #ff6b6b;
    --chat-bg: #232530;
    --chat-border: #3a3a45;
    --chat-message-bg: #2a2a35;
    --footer-bg: #1a1a1a;
    --footer-text: #ccc;
}

html, body {
    width: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: Rubik, 'Segoe UI', 'Trebuchet MS', 'Arial Nova', Arial, sans-serif;
    background: linear-gradient(135deg, 
        var(--bg-gradient-start) 0%, 
        var(--bg-gradient-mid) 50%, 
        var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
    min-height: 100vh;
}

body.fullscreen-active {
    overflow: hidden !important;
    height: 100vh !important;
}

h1, h2, h3 {
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif !important;
}

.navbar {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    gap: 1rem;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--navbar-border);
    transition: background 0.3s ease, border-color 0.3s ease;
    justify-content: space-between;
    position: relative;
    z-index: 1000;
}

body.fullscreen-active .navbar {
    display: none !important;
}

.navbar-brand {
    color: var(--accent) !important;
    font-weight: bold;
    text-decoration: none;
    font-size: 1.1rem;
}

.navbar-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.nav-link {
    color: inherit;
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
}

.nav-link.active {
    color: var(--navbar-active);
}

/* Small responsive tweak: stack on very small screens */
@media (max-width: 480px) {
    .navbar {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.5rem 1rem;
    }

    .navbar-nav {
        flex-direction: column;
        gap: 0.25rem;
        width: 100%;
    }

    .navbar .dark-mode-toggle {
        margin-left: 0 !important;
        margin-top: 0.5rem !important;
    }
}

.container {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1, h2, h3 {
    color: var(--accent)
}

.btn-disabled {
    background: linear-gradient(135deg, #444, #222);
    color: #aaa;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: not-allowed;
    opacity: 0.6;
    transition: 0.3s ease;
}

.btn-disabled:hover {
    opacity: 0.8;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px var(--card-shadow);
    transition: background 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(5px);
}

h3 {
    color: var(--accent);
    transition: 0.3s ease;
}

h3:hover {
    transform: translateX(4px);
}

/* === Fix for dropdown layout: === */

/* Make dropdown menus appear above cards */
.navbar .dropdown-menu {
    position: absolute;
    z-index: 2000;
}

/* Dark mode toggle button */
.dark-mode-toggle {
    background: rgba(255, 128, 80, 0.1) !important;
    border: 2px solid var(--accent) !important;
    color: var(--accent) !important;
    font-size: 1.2rem !important;
    cursor: pointer !important;
    padding: 0.5rem !important;
    border-radius: 50% !important;
    transition: all 0.3s ease !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 40px !important;
    height: 40px !important;
    outline: 2px solid transparent !important;
    box-shadow: none !important;
    position: relative !important;
    z-index: 1001 !important;
}

.dark-mode-toggle:hover {
    background: rgba(255, 128, 80, 0.2) !important;
    transform: scale(1.1) !important;
    outline: 2px solid var(--accent) !important;
    box-shadow: 0 0 10px rgba(255, 128, 80, 0.3) !important;
}

.dark-mode-toggle:active {
    transform: scale(0.95) !important;
    background: rgba(255, 128, 80, 0.3) !important;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--footer-bg);
    color: var(--footer-text);
    border-top: 1px solid var(--chat-border);
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body.fullscreen-active footer {
    display: none !important;
}

/* Additional dark mode styles */
.navbar-nav .nav-link {
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: var(--accent);
}

.dropdown-menu {
    background: var(--card-bg);
    border: 1px solid var(--chat-border);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.dropdown-menu li a {
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.dropdown-menu li a:hover {
    background: var(--navbar-bg);
    color: var(--accent);
}

.btn {
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.form-control {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--chat-border);
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 0.2rem rgba(255, 128, 80, 0.25);
}

/* === FULLSCREEN BOARD STYLES === */
main {
    transition: all 0.3s ease;
}

body.fullscreen-active main {
    display: none !important;
}

body.fullscreen-active #globalChatContainer {
    display: none !important;
}

#boardContainer {
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    aspect-ratio: 1;
}

#boardContainer.fullscreen {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 99999 !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
    background: linear-gradient(135deg, 
        var(--bg-gradient-start) 0%, 
        var(--bg-gradient-mid) 50%, 
        var(--bg-gradient-end) 100%) !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    flex-direction: column !important;
    overflow: auto !important;
}

#boardContainer.fullscreen #board {
    width: 90vw !important;
    height: 90vh !important;
    max-width: 90vw !important;
    max-height: 90vh !important;
}

/* Mobile optimizations */
@media (max-width: 768px) {
    #boardContainer {
        width: 100%;
        max-width: 100%;
        aspect-ratio: 1;
        margin: 0 auto;
    }

    #boardContainer.fullscreen {
        display: flex !important;
        justify-content: center !important;
        align-items: center !important;
    }

    #boardContainer.fullscreen #board {
        width: 90vw !important;
        height: 90vh !important;
    }

    .card {
        padding: 1rem;
        margin-bottom: 1rem;
        border-radius: 8px;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    #boardContainer {
        width: calc(100vw - 20px) !important;
        max-width: calc(100vw - 20px) !important;
        margin: 0 auto;
        aspect-ratio: 1;
    }

    #boardContainer.fullscreen {
        width: 100vw !important;
        height: 100vh !important;
        display: flex !important;
        justify-content: center !important;
        align-items: center !important;
    }

    #boardContainer.fullscreen #board {
        width: 90vw !important;
        height: 90vh !important;
        max-width: 90vw !important;
        max-height: 90vh !important;
    }

    .container {
        padding: 0 0.5rem;
        margin: 1rem auto;
    }

    .card {
        padding: 0.75rem;
        border-radius: 6px;
        margin-bottom: 0.75rem;
    }

    h1, h2 {
        font-size: 1.2rem;
    }

    h3 {
        font-size: 1rem;
    }

    p {
        font-size: 0.9rem;
    }

    .btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
        width: 100%;
    }

    .btn-lg {
        padding: 0.6rem 1rem;
        font-size: 0.95rem;
    }

    .btn-sm {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }

    .row {
        flex-direction: column;
    }

    .col-md-4, .col-md-6, .col-md-8 {
        width: 100% !important;
        max-width: 100%;
    }

    code {
        font-size: 0.75rem;
        word-break: break-all;
    }
}

.fullscreen-btn-wrapper {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 99998;
}

.fullscreen-btn {
    position: relative;
    z-index: 99998;
}

#board {
    width: 100%;
    height: 100%;
}

/* Extra small devices */
@media (max-width: 320px) {
    .container {
        padding: 0;
        margin: 0.5rem auto;
    }

    .card {
        padding: 0.5rem;
        border-radius: 4px;
        margin-bottom: 0.5rem;
    }

    h1, h2 {
        font-size: 1rem;
    }

    h3 {
        font-size: 0.9rem;
    }

    p {
        font-size: 0.8rem;
    }

    .btn {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
}
/* Legal move highlights for Lichess-style UX */
.legal-move-highlight {
    background-color: rgba(100, 200, 100, 0.4) !important;
    border-radius: 50%;
    box-shadow: inset 0 0 8px rgba(100, 200, 100, 0.6);
}

.last-move-highlight {
    background-color: rgba(200, 200, 100, 0.3) !important;
}

.check-highlight {
    background-color: rgba(255, 0, 0, 0.3) !important;
    animation: pulse-check 0.5s infinite alternate;
}

@keyframes pulse-check {
    from { box-shadow: inset 0 0 8px rgba(255, 0, 0, 0.6); }
    to { box-shadow: inset 0 0 12px rgba(255, 0, 0, 0.8); }
}