/* Old School Premium - Windows XP / Classic Mac blend */
:root {
    --bg-desktop: #2c3e50; /* Darker modern retro background */
    --bg-window: #34495e; /* Dark mode default */
    --border-light: #5d6d7e;
    --border-dark: #212f3d;
    --text-main: #ecf0f1;
    --title-bg: #2980b9;
    --title-text: #ffffff;
    --input-bg: #1c2833;
    --input-text: #ecf0f1;
    --btn-bg: #3498db;
    --btn-hover: #2980b9;
}

body {
    background-color: var(--bg-desktop);
    color: var(--text-main);
    font-family: 'Tahoma', 'Segoe UI', sans-serif;
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Window Shell */
.window {
    background-color: var(--bg-window);
    border: 2px solid var(--border-light);
    border-bottom-color: var(--border-dark);
    border-right-color: var(--border-dark);
    box-shadow: 4px 4px 10px rgba(0,0,0,0.5);
    min-width: 320px;
    display: flex;
    flex-direction: column;
}

.window-title {
    background: var(--title-bg);
    color: var(--title-text);
    padding: 5px 8px;
    font-weight: bold;
    font-size: 14px;
    letter-spacing: 1px;
    user-select: none;
    border-bottom: 1px solid var(--border-dark);
}

.window-content {
    padding: 20px;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 12px;
    text-transform: uppercase;
    color: #bdc3c7;
}

input[type="password"], input[type="text"] {
    width: 100%;
    padding: 6px;
    background-color: var(--input-bg);
    color: var(--input-text);
    border: 1px solid var(--border-dark);
    border-bottom-color: var(--border-light);
    border-right-color: var(--border-light);
    box-sizing: border-box;
    font-family: monospace;
}

input:focus {
    outline: 1px solid var(--btn-bg);
}

button {
    background-color: var(--btn-bg);
    color: #fff;
    border: 1px solid var(--border-dark);
    border-bottom-color: var(--border-dark);
    border-right-color: var(--border-dark);
    padding: 6px 15px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
}

button:active {
    background-color: var(--btn-hover);
    border-top-color: var(--border-dark);
    border-left-color: var(--border-dark);
    border-bottom-color: var(--border-light);
    border-right-color: var(--border-light);
}

.error {
    color: #e74c3c;
    font-size: 12px;
    margin-bottom: 10px;
    text-align: center;
    font-weight: bold;
}

/* Sidebar Nav Items */
.nav-item {
    padding: 8px 10px;
    margin-bottom: 5px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-dark);
    cursor: pointer;
    font-weight: bold;
    user-select: none;
    font-size: 13px;
}

.nav-item:hover {
    background-color: var(--btn-bg);
    color: #fff;
}

.nav-item:active {
    background-color: var(--btn-hover);
    border: 1px inset var(--border-dark);
}