:root {
    --primary-dark: #1a1a2e;
    --secondary-dark: #16213e;
    --accent-color: #e94560;
    --accent-light: #ff7b8b;
    --text-light: #f1f1f1;
    --text-muted: #b8b8b8;
    --success-color: #06d6a0;
    --warning-color: #ffd166;
    --background-color: var(--primary-dark);
    --card-bg-color: var(--secondary-dark);
    --text-color: var(--text-light);
    --input-bg-color: rgba(26, 26, 46, 0.8);
    --input-border-color: rgba(233, 69, 96, 0.3);
}

/* Light mode variables */
:root.light-mode {
    --primary-dark: #f8f9fa;
    --secondary-dark: #e9ecef;
    --accent-color: #d63384;
    --accent-light: #e83e8c;
    --text-light: #212529;
    --text-muted: #6c757d;
    --background-color: var(--primary-dark);
    --card-bg-color: var(--secondary-dark);
    --text-color: var(--text-light);
    --input-bg-color: rgba(255, 255, 255, 0.8);
    --input-border-color: rgba(214, 51, 132, 0.3);
}

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 900px;
}

h1, h2, h3, h4 {
    font-family: 'Playfair Display', serif;
    color: var(--accent-light);
    transition: color 0.3s;
}

.logo {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.logo img {
    height: 80px;
    filter: drop-shadow(0 0 5px rgba(233, 69, 96, 0.7));
}

.logo::after {
    content: "";
    display: block;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), transparent);
    margin: 10px auto;
    transition: background 0.3s;
}

.card {
    background-color: var(--card-bg-color);
    border: none;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    overflow: hidden;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.card-header {
    background-color: rgba(22, 33, 62, 0.8);
    border-bottom: 1px solid rgba(233, 69, 96, 0.3);
    font-weight: 600;
    letter-spacing: 1px;
    transition: background-color 0.3s, border-color 0.3s;
}

.light-mode .card-header {
    background-color: rgba(233, 236, 239, 0.8);
    border-bottom: 1px solid rgba(214, 51, 132, 0.3);
}

.form-control, .form-control:focus {
    background-color: var(--input-bg-color);
    border: 1px solid var(--input-border-color);
    color: var(--text-color);
    border-radius: 5px;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.form-control:focus {
    box-shadow: 0 0 0 0.2rem rgba(233, 69, 96, 0.25);
}

.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: 600;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.btn-primary:hover {
    background-color: var(--accent-light);
    border-color: var(--accent-light);
    transform: translateY(-2px);
}

.btn-group-toggle .btn {
    background-color: var(--input-bg-color);
    color: var(--text-muted);
    border: 1px solid var(--input-border-color);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.btn-group-toggle .btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

#response {
    margin-top: 20px;
    padding: 20px;
    background-color: rgba(26, 26, 46, 0.5);
    border-radius: 10px;
    border-left: 3px solid var(--accent-color);
    min-height: 100px;
    white-space: pre-line;
    transition: background-color 0.3s, border-color 0.3s;
}

.light-mode #response {
    background-color: rgba(233, 236, 239, 0.5);
}

.typing-indicator {
    display: none;
    color: var(--accent-light);
    font-style: italic;
    margin: 10px 0;
    transition: color 0.3s;
}

.typing-indicator::after {
    content: "...";
    animation: dots 1.5s infinite;
}

@keyframes dots {
    0%, 20% { content: "."; }
    40% { content: ".."; }
    60%, 100% { content: "..."; }
}

/* Dual ring spinner */
.spinner {
    display: none;
    width: 80px;
    height: 80px;
    margin: 20px auto;
}

.spinner:after {
    content: " ";
    display: block;
    width: 64px;
    height: 64px;
    margin: 8px;
    border-radius: 50%;
    border: 6px solid var(--accent-color);
    border-color: var(--accent-color) transparent var(--accent-color) transparent;
    animation: spinner 1.2s linear infinite;
}

@keyframes spinner {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.dark-mode-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--accent-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transition: all 0.3s ease;
}

.dark-mode-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.dark-mode-toggle i {
    color: white;
    font-size: 20px;
    transition: all 0.3s ease;
}

.light-mode .dark-mode-toggle i.fa-moon {
    display: none;
}

.light-mode .dark-mode-toggle i.fa-sun {
    display: block;
}

.dark-mode-toggle i.fa-sun {
    display: none;
}

.section-divider {
    border: 0;
    height: 1px;
    background-image: linear-gradient(to right, transparent, var(--accent-color), transparent);
    margin: 30px 0;
    transition: background-image 0.3s;
}

.text-muted {
    color: var(--text-muted) !important;
    transition: color 0.3s;
}