:root {
    /* Colors */
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --text-color: #333333;
    --light-text: #7f8c8d;
    --background-color: #f5f7fa;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --inner-bg: #fafafa;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --border-radius: 25px;

    /* Neumorphism */
    --neu-bg: #f5f7fa;
    --neu-shadow-light: #ffffff;
    --neu-shadow-dark: #d1d9e6;
    --neu-shadow-inset-light: inset 5px 5px 10px #d1d9e6, inset -5px -5px 10px #ffffff;
    --neu-shadow-out: 8px 8px 16px #d1d9e6, -8px -8px 16px #ffffff;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --inner-bg: #222222;
    --text-color: #e0e0e0;
    --light-text: #a0a0a0;
    --border-color: #404040;
    --secondary-color: #ecf0f1;
    /* Primary determines links/buttons, can keep or slightly adjustment */
    --primary-color: #5d9cec;

    /* Neumorphism Dark */
    --neu-bg: #2d2d2d;
    /* Matching card-bg */
    --neu-shadow-light: #3d3d3d;
    --neu-shadow-dark: #1e1e1e;
    --neu-shadow-inset-light: inset 5px 5px 10px #1e1e1e, inset -5px -5px 10px #3d3d3d;
    --neu-shadow-out: 8px 8px 16px #1e1e1e, -8px -8px 16px #3d3d3d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    height: 100vh;
    overflow: hidden;
    /* App-like feel */
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.main-header {
    background-color: var(--card-bg);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

/* Logo styling - horizontal layout with logo image + text group */
.logo {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 12px !important;
    flex-shrink: 0;
}

.logo-text-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}

.logo img,
.logo-image {
    height: 40px;
    width: auto;
    object-fit: contain;
    flex-shrink: 0;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    line-height: 1.2;
}

.logo p {
    margin: 0;
    line-height: 1;
}

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    /* Removed center alignment to allow proper scrolling of tall content */
}

.welcome-container {
    text-align: center;
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.main-footer {
    text-align: center;
    padding: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--light-text);
}

/* Utilities */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-weight: 600;
    transition: all 0.2s ease;
    box-shadow: 5px 5px 10px var(--neu-shadow-dark), -5px -5px 10px var(--neu-shadow-light);
}

.btn:active {
    box-shadow: inset 5px 5px 10px var(--neu-shadow-dark), inset -5px -5px 10px var(--neu-shadow-light);
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    /* In light mode, secondary is dark blue, text white is good. */
}

/* Dark theme adjustment for secondary button text */
[data-theme="dark"] .btn-secondary {
    color: var(--card-bg);
    /* In dark mode, secondary is light (ecf0f1), so text needs to be dark */
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
}

.btn-outline:hover {
    background: rgba(0, 0, 0, 0.05);
    /* Light hover overlay */
}

[data-theme="dark"] .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Form Styles (Global) */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-color);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 10%, transparent);
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    .main-header {
        padding: var(--spacing-sm) var(--spacing-md);
        /* flex-direction: column; - REMOVED conflict */
        flex-direction: row;
        /* Enforce row for tablets too */
        justify-content: space-between;
        gap: 10px;
        text-align: left;
    }

    .main-content {
        padding: var(--spacing-md);
    }
}