:root {
    --nav-height: 88px;

    /* Executive Palette */
    --color-bg-body: #F5F7F6;
    /* Cool, neutral light gray/white */
    --color-bg-nav: #FFFFFF;
    --color-bg-dropdown: #FFFFFF;

    --color-text-main: #1A1A1A;
    /* Almost Black */
    --color-text-muted: #666666;

    --color-border: #E8E8E8;
    --color-border-active: #333333;
    /* For robust active states */

    --color-hover-bg: #F4F4F4;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;

    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.03);
    --shadow-dropdown: 0 10px 40px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* Themes */
[data-theme="dark"] {
    --color-bg-body: #121212;
    --color-bg-nav: #1E1E1E;
    --color-bg-dropdown: #252525;
    --color-text-main: #E0E0E0;
    --color-text-muted: #999999;
    --color-border: #333333;
    --color-border-active: #E0E0E0;
    --color-hover-bg: #2C2C2C;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-dropdown: 0 10px 40px rgba(0, 0, 0, 0.4);
}

[data-theme="emerald"] {
    --color-bg-body: #051810;
    --color-bg-nav: #0A2418;
    --color-bg-dropdown: #0F2E20;
    --color-text-main: #E0F2E9;
    --color-text-muted: #8AAFAB;
    --color-border: #1B4530;
    --color-border-active: #50C878;
    --color-hover-bg: #143D2A;
    --shadow-soft: 0 4px 20px rgba(0, 20, 10, 0.3);
    --shadow-dropdown: 0 10px 40px rgba(0, 20, 10, 0.4);
}

[data-theme="sunset"] {
    --color-bg-body: #1A0F0A;
    --color-bg-nav: #29150F;
    --color-bg-dropdown: #331A13;
    --color-text-main: #FCEADD;
    --color-text-muted: #BA8E7A;
    --color-border: #4A2518;
    --color-border-active: #FF7E47;
    --color-hover-bg: #402015;
    --shadow-soft: 0 4px 20px rgba(30, 10, 0, 0.3);
    --shadow-dropdown: 0 10px 40px rgba(30, 10, 0, 0.4);
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation Bar */
.omni-nav {
    height: var(--nav-height);
    background-color: var(--color-bg-nav);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    /* Increased side padding */
    box-shadow: var(--shadow-soft);
    flex-shrink: 0;
    z-index: 1000;
    transition: box-shadow 0.3s ease, height 0.3s ease, padding 0.3s ease;
}

/* Branding */
.branding {
    display: flex;
    align-items: center;
    gap: 16px;
    transition: gap 0.3s ease;
}

.logo-img {
    width: 48px;
    height: 48px;
    object-fit: cover;
    border-radius: 50%;
    /* Circle for profile */
    transition: width 0.3s ease, height 0.3s ease;
    border: 2px solid var(--color-border);
}

/* Compact State Adjustments */
.omni-nav.compact {
    padding: 0 24px;
}

.omni-nav.compact .branding {
    gap: 12px;
}

.omni-nav.compact .logo-img {
    width: 32px;
    height: 32px;
}

.branding-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
}

.brand-name {
    font-weight: var(--font-weight-semibold);
    font-size: 16px;
    letter-spacing: -0.01em;
    color: var(--color-text-main);
}

.brand-sub {
    font-size: 12px;
    color: var(--color-text-muted);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    gap: 8px;
    /* Increased gap */
    height: 100%;
}

.nav-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-btn {
    background: none;
    border: none;
    height: 48px;
    /* Button height smaller than nav height for floating feel or fill? Let's verify. */
    /* Actually let's keep it filling height but add specific styling */
    height: 100%;
    padding: 0 24px;

    font-family: inherit;
    font-size: 14px;
    /* More refined size */
    font-weight: var(--font-weight-medium);
    color: var(--color-text-muted);

    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
    /* Prepare for active state */
}

.nav-btn:hover {
    color: var(--color-text-main);
    background-color: transparent;
    /* Clean hover */
}

.nav-item.active .nav-btn {
    color: var(--color-text-main);
    border-bottom-color: var(--color-border-active);
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: calc(100% + 4px);
    /* Slight offset */
    left: 0;
    background-color: var(--color-bg-dropdown);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-dropdown);
    min-width: 220px;

    display: none;
    flex-direction: column;
    padding: 8px;
    border-radius: 8px;

    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    /* Prevent clicks when hidden/animating out */
}

/* Class to handle animation visibility */
.nav-item.active .dropdown {
    display: flex;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.dropdown-item {
    padding: 10px 16px;
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 14px;
    border-radius: 4px;
    transition: all 0.15s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    /* For potential arrows/icons */
}

.dropdown-item:hover {
    background-color: var(--color-hover-bg);
    color: var(--color-text-main);
}

/* Settings Area */
.settings-area {
    display: flex;
    justify-content: flex-end;
}

.settings-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    color: var(--color-text-muted);
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-btn:hover {
    background-color: var(--color-hover-bg);
    color: var(--color-text-main);
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    position: relative;
    background-color: var(--color-bg-body);
    /* Inset look for the frame, optional */
}

#content-frame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* Loading Indicator */
.loader-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 2px;
    background-color: var(--color-text-main);
    width: 0%;
    transition: width 0.2s ease, opacity 0.3s ease;
    z-index: 1001;
    opacity: 0;
}

.loader-bar.loading {
    opacity: 1;
    width: 70%;
    /* Simulated progress */
    transition: width 2s cubic-bezier(0.22, 1, 0.36, 1);
}


/* Modal System */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(2px);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.settings-modal {
    background-color: var(--color-bg-nav);
    width: 440px;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    transform: scale(0.95) translateY(10px);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.modal-overlay.open .settings-modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-main);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 4px;
    border-radius: 4px;
    transition: color 0.15s;
}

.modal-close:hover {
    color: var(--color-text-main);
    background-color: var(--color-hover-bg);
}

.modal-body {
    padding: 24px;
    max-height: 70vh;
    overflow-y: auto;
}

.settings-group {
    margin-bottom: 24px;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.group-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: 12px;
}

/* Control Row */
.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.control-label {
    font-size: 14px;
}

.control-name {
    display: block;
    color: var(--color-text-main);
    font-weight: 500;
    margin-bottom: 2px;
}

.control-desc {
    display: block;
    font-size: 12px;
    color: var(--color-text-muted);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: .3s cubic-bezier(0.16, 1, 0.3, 1);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s cubic-bezier(0.16, 1, 0.3, 1);
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

input:checked+.slider {
    background-color: var(--color-text-main);
    /* Black in light, White in dark usually, but let's stick to text-main logic which is contrasting */
}

[data-theme="dark"] input:checked+.slider {
    background-color: #FFFFFF;
    /* High contrast for dark mode active state */
}

[data-theme="dark"] .slider:before {
    background-color: #121212;
    /* Dark knob */
}

input:checked+.slider:before {
    transform: translateX(20px);
}

/* Checkbox */
.checkbox-container {
    display: block;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
    color: var(--color-text-main);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: transparent;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    transition: all 0.2s;
}

.checkbox-container:hover input~.checkmark {
    border-color: var(--color-text-muted);
}

.checkbox-container input:checked~.checkmark {
    background-color: var(--color-text-main);
    border-color: var(--color-text-main);
}

[data-theme="dark"] .checkbox-container input:checked~.checkmark {
    background-color: #FFFFFF;
    border-color: #FFFFFF;
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked~.checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

[data-theme="dark"] .checkbox-container .checkmark:after {
    border-color: #121212;
}

/* Select Input */
.select-input {
    appearance: none;
    -webkit-appearance: none;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-main);
    font-family: inherit;
    font-size: 14px;
    padding: 6px 32px 6px 12px;
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 8px center;
    background-size: 16px;
    transition: border-color 0.2s;
}

.select-input:hover {
    border-color: var(--color-text-muted);
}

.select-input:focus {
    outline: none;
    border-color: var(--color-text-main);
}