:root {
    /* Color Palette - Soft Dark / Yellow Accent */
    --color-bg-base: #121212;
    --color-bg-subtle: #181818;
    --color-bg-elevated: #282828;
    --color-bg-highlight: #3E3E3E;

    /* Background Gradient Helpers */
    --gradient-bg: linear-gradient(180deg, #1E1E1E 0%, #121212 100%);
    --gradient-card: linear-gradient(145deg, rgba(40, 40, 40, 0.6) 0%, rgba(20, 20, 20, 0.4) 100%);

    --color-text-base: #FFFFFF;
    --color-text-subtle: #B3B3B3;
    --color-text-muted: #727272;

    /* Accent Colors - Yellow */
    --color-primary: #FFD700;
    --color-primary-hover: #E6C200;
    --color-primary-text: #000000;

    --color-danger: #E91E63;
    --color-warning: #FF9800;
    --color-success: #4CAF50;
    --color-info: #2196F3;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 64px;

    /* Borders & Radius - Soft & Rounded */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-pill: 500px;
    /* Full pill shape */

    --border-width: 1px;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-hover: rgba(255, 255, 255, 0.2);

    /* Fonts */
    --font-family: 'Circular Std', 'Inter', 'Helvetica Neue', Arial, sans-serif;
    --font-size-sm: 0.8rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.75rem;
    --font-size-xxl: 2.5rem;

    /* Layout */
    --sidebar-width: 240px;
    --topbar-height: 64px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.3, 0, 0.4, 1);
    --transition-medium: 0.3s cubic-bezier(0.3, 0, 0.4, 1);
    --backdrop-blur: blur(20px);
}

/* Base Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-base);
    color: var(--color-text-base);
    font-size: var(--font-size-base);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    letter-spacing: 0.01em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    display: block;
}

/* Layout */
.app-shell {
    display: flex;
    min-height: 100vh;
    background: var(--color-bg-base);
}

.sidebar {
    width: var(--sidebar-width);
    background-color: #000000;
    display: flex;
    flex-direction: column;
    padding: var(--space-lg) var(--space-md);
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    overflow-y: auto;
}

.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: var(--sidebar-width);
    background: var(--gradient-bg);
    /* Use Gradient */
    min-height: 100vh;
    position: relative;
    width: calc(100% - var(--sidebar-width));
}

.content {
    padding: var(--space-xl);
    flex: 1;
}

/* Sidebar Components */
.sidebar__brand {
    padding: 0 var(--space-sm) var(--space-xl);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-base);
    margin-bottom: var(--space-sm);
}

.brand-logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.sidebar__nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar__link {
    display: flex;
    align-items: center;
    padding: 10px var(--space-md);
    color: var(--color-text-subtle);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.sidebar__link:hover {
    color: var(--color-text-base);
    background-color: var(--color-bg-elevated);
}

.sidebar__link.active {
    color: var(--color-text-base);
    background-color: var(--color-bg-elevated);
    /* No border-left anymore, subtle background highlight */
}

.sidebar__link svg {
    margin-right: 16px;
    width: 24px;
    height: 24px;
    fill: currentColor;
    /* Simple one color */
    opacity: 0.8;
}

.sidebar__link.active svg {
    opacity: 1;
    fill: var(--color-text-base);
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    background-color: rgba(18, 18, 18, 0.8);
    /* Semi-transparent */
    backdrop-filter: var(--backdrop-blur);
    /* Glass effect */
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 90;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: background-color var(--transition-medium);
}

.search-bar {
    flex: 0 1 360px;
}

.search-bar input {
    width: 100%;
    background-color: var(--color-bg-elevated);
    color: var(--color-text-base);
    border: none;
    border-radius: var(--radius-pill);
    /* Pill  */
    padding: 10px 20px;
    font-size: var(--font-size-sm);
    font-family: inherit;
    transition: background-color var(--transition-fast);
}

.search-bar input:focus {
    background-color: var(--color-bg-highlight);
    outline: none;
    box-shadow: 0 0 0 1px var(--border-color-hover);
}

.topbar__user {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
    background-color: rgba(0, 0, 0, 0.4);
    padding: 4px 12px 4px 4px;
    border-radius: var(--radius-pill);
    transition: background-color var(--transition-fast);
}

.topbar__user:hover {
    background-color: rgba(0, 0, 0, 0.6);
}

.topbar__user .avatar {
    width: 28px;
    height: 28px;
    background-color: var(--color-bg-elevated);
    border-radius: 50%;
    /* Circle */
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--color-text-base);
    overflow: hidden;
}

.topbar__user .user-name {
    font-weight: 700;
    font-size: 0.85rem;
}

/* Typography */
h1,
h2,
h3 {
    color: var(--color-text-base);
    font-weight: 700;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
}

h3 {
    font-size: 1.25rem;
}

p,
.muted {
    color: var(--color-text-subtle);
    font-weight: 400;
}

/* Cards */
.card {
    background: var(--gradient-card);
    /* Soft gradient */
    border-radius: var(--radius-lg);
    /* Rounded */
    padding: var(--space-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    /* Usually no border, or very subtle */
    border: 1px solid var(--border-color);
}

/* Grid */
.cards-grid,
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-lg);
}

.media-card {
    background-color: var(--color-bg-subtle);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    cursor: pointer;
    /* Soft hover effect */
}

.media-card:hover {
    background-color: var(--color-bg-elevated);
}

.media-thumb {
    width: 100%;
    aspect-ratio: 1;
    background-color: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    /* Rounded corners for images */
    margin-bottom: var(--space-md);
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

.media-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-medium);
}

.media-card:hover .media-thumb img {
    transform: scale(1.05);
    /* Zoom effect */
}

.media-body div {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pill {
    display: inline-block;
    padding: 4px 12px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-base);
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    background-color: var(--color-primary);
    color: var(--color-primary-text);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    border: none;
    border-radius: var(--radius-pill);
    /* Pill buttons */
    cursor: pointer;
    transition: transform var(--transition-fast), background-color var(--transition-fast);
    letter-spacing: 0.05em;
}

.btn:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.04);
}

.btn.secondary {
    -webkit-background-clip: text;
    background-clip: text;
    background-color: transparent;
    border: 1px solid var(--color-text-subtle);
    color: var(--color-text-base);
}

.btn.secondary:hover {
    border-color: var(--color-text-base);
    background-color: rgba(255, 255, 255, 0.1);
    transform: scale(1.04);
}

/* Forms */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--color-text-base);
    opacity: 0.9;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
input[type="file"],
textarea,
select {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--color-bg-highlight);
    border: 1px solid transparent;
    border-radius: 4px;
    /* Standard inputs slightly rounded */
    color: var(--color-text-base);
    font-family: inherit;
    transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus {
    outline: none;
    background-color: #4A4A4A;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

/* File Upload Custom Style */
input[type="file"] {
    padding: 10px;
    background-color: var(--color-bg-elevated);
    cursor: pointer;
    border-radius: var(--radius-md);
}

input[type="file"]::file-selector-button {
    margin-right: 16px;
    border: none;
    background: var(--color-primary);
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    color: var(--color-primary-text);
    cursor: pointer;
    font-weight: 700;
    transition: background .2s ease;
}

input[type="file"]::file-selector-button:hover {
    background: var(--color-primary-hover);
}

/* Alert */
.alert {
    padding: 12px 20px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    font-weight: 600;
    font-size: 0.9rem;
}

.alert-error {
    background-color: rgba(233, 30, 99, 0.1);
    color: #FF5252;
    border: 1px solid rgba(233, 30, 99, 0.2);
}

.alert-success {
    background-color: rgba(76, 175, 80, 0.1);
    color: #69F0AE;
    border: 1px solid rgba(76, 175, 80, 0.2);
}

/* Tables */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 4px;
    /* Space between rows */
}

th {
    text-align: left;
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 16px;
    font-weight: 600;
}

td {
    padding: 12px 16px;
    background-color: rgba(255, 255, 255, 0.02);
    /* border-radius for first and last cells */
}

tr:hover td {
    background-color: rgba(255, 255, 255, 0.05);
}

tr td:first-child {
    border-top-left-radius: 4px;
    border-bottom-left-radius: 4px;
}

tr td:last-child {
    border-top-right-radius: 4px;
    border-bottom-right-radius: 4px;
}

/* Specialized Profile Avatar */
.profile-avatar-preview {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    /* Circle profile */
    object-fit: cover;
    background-color: var(--color-bg-elevated);
    border: 2px solid var(--color-bg-highlight);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-text-muted);
}

.profile-avatar-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Utils */
.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

.align-center {
    align-items: center;
}

/* Mobile */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 80%;
        max-width: 300px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-area {
        margin-left: 0;
        width: 100%;
    }

    .sidebar-toggle {
        display: block;
    }
}

/* Fix Icon Button Styles (Sidebar Close & Toggle) */
.sidebar-toggle,
.sidebar__close {
    background: transparent;
    border: none;
    color: var(--color-text-base);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border-radius: 50%;
    transition: background-color var(--transition-fast);
}

.sidebar-toggle:hover,
.sidebar__close:hover {
    background-color: var(--color-bg-elevated);
}

.sidebar-toggle svg,
.sidebar__close svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    fill: none;
}

.sidebar__brand span {
    white-space: nowrap;
}

@media (min-width: 769px) {
    .sidebar-toggle {
        display: none;
    }

    .sidebar__close {
        display: none;
    }
}


/* Landing Page Specific Styles */
.landing-page {
    /* Ensure full width and no default padding interfering */
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.landing-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl) 0;
    margin-bottom: var(--space-xxl);
}

.landing-brand {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-base);
    letter-spacing: -0.02em;
}

.landing-brand img {
    height: 40px;
    width: 40px;
}

.hero-section {
    text-align: center;
    padding: var(--space-xxl) 0;
    margin-bottom: var(--space-xxl);
    animation: fadeIn var(--transition-medium) ease-in-out;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, #FFFFFF 0%, #B3B3B3 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-subtle);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.hero-btn-lg {
    padding: 16px 48px;
    font-size: 1rem;
    border-radius: var(--radius-pill);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-bottom: 120px;
}

.feature-card {
    background: var(--color-bg-subtle);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-5px);
    background-color: var(--color-bg-elevated);
    border-color: rgba(255, 255, 255, 0.1);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 215, 0, 0.1); /* Gold tint */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    color: var(--color-primary);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-text-base);
}

.feature-desc {
    color: var(--color-text-subtle);
    font-size: 1rem;
    line-height: 1.5;
}

.cta-section {
    text-align: center;
    background: var(--gradient-card);
    padding: 80px var(--space-xl);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    margin-bottom: 80px;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, rgba(0,0,0,0) 70%);
    z-index: 0;
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 1;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .landing-nav {
        flex-direction: column;
        gap: var(--space-md);
    }
}