:root {
    /* Light Theme Defaults */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-gradient-start: #eef2ff;
    --bg-gradient-end: #e0e7ff;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --input-bg: #f9fafb;
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Dark Theme Overrides */
[data-theme="dark"] {
    --primary-color: #6366f1; /* Lighter indigo for contrast */
    --primary-hover: #818cf8;
    --bg-gradient-start: #111827; /* Very Dark Gray */
    --bg-gradient-end: #0f172a;   /* Slate 900 */
    --card-bg: #1f2937;           /* Slate 800 */
    --text-main: #f9fafb;         /* White-ish */
    --text-muted: #9ca3af;        /* Light Gray */
    --border-color: #374151;      /* Dark Border */
    --input-bg: #111827;
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    transition: background 0.3s ease, color 0.3s ease;
}

.main-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 20px;
}

.content-box {
    width: 100%;
    max-width: 480px;
    background: var(--card-bg);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
    text-align: center;
    position: relative;
    border: 1px solid var(--border-color);
}

.logo-area {
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 48px;
    color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
    padding: 16px;
    border-radius: 20px;
}

.main-title {
    font-size: 24px;
    font-weight: 800;
    margin: 0 0 8px 0;
    color: var(--text-main);
}

.subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0 0 30px 0;
}

.input-group {
    text-align: left;
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
    margin-left: 4px;
}

#codename {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-main);
    transition: all 0.2s ease;
    box-sizing: border-box;
}

#codename:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

/* --- JS Triggered Panel Styles --- */
.hidden-panel {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 10px;
}

/* When active, JS might override styles inline, but this acts as a robust fallback */
.hidden-panel.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.primary-btn {
    width: 100%;
    background: var(--primary-color);
    color: white;
    font-size: 16px;
    font-weight: 600;
    padding: 16px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(0,0,0,0.15);
}

.primary-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    filter: grayscale(1);
    transform: none;
    box-shadow: none;
}

.secondary-btn {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 14px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.secondary-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--card-bg);
}

.secondary-btn i {
    color: var(--text-muted);
}
.secondary-btn:hover i {
    color: var(--primary-color);
}

.divider {
    height: 1px;
    background: var(--border-color);
    margin: 5px 0;
    width: 100%;
}

.bottom-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.text-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px;
}

.text-btn:hover {
    color: var(--primary-color);
}

/* Mobile Responsive */
@media (max-width: 480px) {
    .content-box {
        padding: 30px 20px;
    }
}