:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger: #ef4444;
    --success: #10b981;
    --border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-image: radial-gradient(circle at top right, rgba(56, 189, 248, 0.15), transparent 40%),
                      radial-gradient(circle at bottom left, rgba(16, 185, 129, 0.15), transparent 40%);
}

/* Auth & Admin Container */
.container {
    width: 100%;
    max-width: 500px;
    margin-top: 10vh;
    padding: 2rem;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    text-align: center;
    font-weight: 700;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.2rem;
}

select option {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    padding: 10px;
}

/* Custom URL Input styling */
.custom-url-container {
    margin-top: 0.75rem;
    display: none; /* hidden by default */
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

button {
    width: 100%;
    padding: 0.875rem;
    background-color: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

button:active {
    transform: translateY(0);
}

button.danger {
    background-color: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    margin-top: 1rem;
}

button.danger:hover {
    background-color: rgba(239, 68, 68, 0.1);
    box-shadow: none;
}

.error-message {
    color: var(--danger);
    font-size: 0.85rem;
    text-align: center;
    margin-top: -1rem;
    margin-bottom: 1rem;
    display: none;
}

.success-message {
    color: var(--success);
    font-size: 0.85rem;
    text-align: center;
    margin-top: 1rem;
    opacity: 0;
    transition: opacity 0.3s;
}

/* Screen/Iframe styling for Game and Leaderboard */
.full-screen-iframe {
    width: 100vw;
    height: 100vh;
    border: none;
    display: block;
    background: #000;
}

.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: bold;
    transition: opacity 0.5s ease;
}

.loader {
    width: 48px;
    height: 48px;
    border: 5px solid rgba(255, 255, 255, 0.1);
    border-bottom-color: var(--accent);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin-right: 15px;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}