:root {
    --bg-primary: #0f1115;
    --bg-secondary: rgba(25, 28, 36, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-error: #ef4444;

    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --blur: blur(12px);
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 0;
    position: relative;
    overflow-x: hidden;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

/* Decorative ambient backgrounds */
.decorative-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 0;
    opacity: 0.15;
    pointer-events: none;
}
.blob-1 {
    top: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: var(--accent-primary);
}
.blob-2 {
    bottom: -100px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: var(--accent-secondary);
}

/* Navbar */
.top-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(15, 17, 21, 0.8);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--border-color);
    z-index: 20;
    position: sticky;
    top: 0;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.navbar-logo i {
    color: var(--accent-primary);
    font-size: 1.75rem;
}

/* Tabs Navigation */
.tabs-navigation {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-primary);
    border-color: rgba(59, 130, 246, 0.3);
}

/* Layout */
.main-content {
    flex-grow: 1;
    padding: 2rem;
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
}

.tabs-content {
    flex-grow: 1;
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

/* Cards (Glassmorphism) */
.api-card {
    display: none;
    flex-grow: 1;
    background: var(--bg-secondary);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    flex-direction: column;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    overflow: hidden;
}

.api-card.active-card {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--accent-primary);
}

#card-joke .card-icon { color: #f59e0b; }
#card-user .card-icon { color: #10b981; }
#card-post .card-icon { color: #ec4899; }

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.card-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.state-container {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 1rem;
    position: relative;
    width: 100%;
}

/* Common UI Elements */
.placeholder-state {
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.placeholder-state i {
    font-size: 3rem;
    opacity: 0.3;
}

.loader {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error-state {
    color: var(--accent-error);
    background: rgba(239, 68, 68, 0.1);
    padding: 1rem;
    border-radius: var(--radius-sm);
    width: 100%;
    max-width: 400px;
}

.error-state i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.hidden {
    display: none !important;
}

/* Buttons */
.card-footer {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.btn {
    min-width: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: #e2e8f0;
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* Custom Data Views */
/* Dog View */
.dog-result {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    flex-grow: 1;
}
.dog-img-container {
    width: 100%;
    flex-grow: 1;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}
.dog-img-container img {
    max-width: 100%;
    max-height: 50vh; /* Adjust height limit to keep UI neat */
    object-fit: contain;
    border-radius: var(--radius-sm);
}
.breed-badge {
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
    padding: 0.35rem 1rem;
    border-radius: 99px;
    font-size: 1rem;
    font-weight: 500;
    text-transform: capitalize;
}

/* Joke View */
.joke-result {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
    flex-grow: 1;
}
.joke-setup {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.4;
}
.joke-punchline {
    font-size: 1.25rem;
    color: var(--accent-secondary);
    background: rgba(139, 92, 246, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--accent-secondary);
}

/* User View */
.user-result {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-grow: 1;
}
.user-avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 4px solid var(--accent-success);
    padding: 4px;
}
.user-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}
.user-info {
    text-align: center;
    background: rgba(0,0,0,0.15);
    padding: 2rem;
    border-radius: var(--radius-md);
    min-width: 300px;
}
.user-name {
    font-weight: 600;
    font-size: 1.75rem;
    margin-bottom: 1rem;
}
.user-details {
    color: var(--text-secondary);
    font-size: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.user-details span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Post View */
.post-result {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1rem;
    flex-grow: 1;
}
.post-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: capitalize;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.3;
}
.post-body {
    color: var(--text-secondary);
    font-size: 1.15rem;
    background: rgba(0,0,0,0.15);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    margin-top: 1rem;
    line-height: 1.6;
}

/* Responsiveness */
@media (max-width: 768px) {
    .top-navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    .tabs-navigation {
        width: 100%;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        justify-content: flex-start;
    }
    .main-content { padding: 1rem; }
    .api-card { padding: 1rem; }
    .btn { min-width: 100%; }
}