/* --- Global Styles & Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

/* --- THEME COLORS --- */
/* DARK THEME (DEFAULT) */
:root {
    /* Base */
    --clr-dark-a0: #000000;
    --clr-light-a0: #ffffff;

    /* Surface */
    --clr-surface-a0: #121212;
    --clr-surface-a10: #282828;
    --clr-surface-a20: #3f3f3f;
    --clr-surface-a30: #575757;
    --clr-surface-a50: #8b8b8b;

    /* Primary */
    --clr-primary-a0: #56b7f6;
    --clr-primary-a20: #85c7f8;
    --clr-gradient-stop-2: #c13584; /* Adding a pink/purple for a richer gradient */


    /* Misc */
    --error-color: #ef4444;
    --border-color: rgba(255, 255, 255, 0.1);
}

/* LIGHT THEME */
[data-theme='light'] {
    /* Base */
    --clr-dark-a0: #18181b;       /* Nearly Black */
    --clr-light-a0: #ffffff;    /* White */

    /* Surface */
    --clr-surface-a0: #f4f4f5; /* Light Gray */
    --clr-surface-a10: #ffffff;    /* White */
    --clr-surface-a20: #e5e7eb;   /* Light Gray */
    --clr-surface-a30: #d1d5db;   /* Lighter Gray */
    --clr-surface-a50: #6b7280; /* Medium Gray */

    /* Primary */
    --clr-primary-a0: #3b82f6;    /* Stronger Blue */
    --clr-primary-a20: #60a5fa;
    --clr-gradient-stop-2: #8f00ff; /* A stronger purple for light mode */

    /* Misc */
    --border-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--clr-surface-a0);
    color: var(--clr-light-a0);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

[data-theme='light'] body {
    color: var(--clr-dark-a0);
}

/* --- Main Website Header --- */
#main-header {
    width: 100%;
    padding: 1rem 2rem;
    background-color: var(--clr-surface-a10);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    position: sticky;
    top: 0;
    z-index: 100;
    box-sizing: border-box;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--clr-primary-a0);
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    color: var(--clr-light-a0);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

[data-theme='light'] .main-nav a {
    color: var(--clr-dark-a0);
}

.main-nav a:hover {
    color: var(--clr-primary-a0);
}


main {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem; /* Added more padding */
    overflow: hidden;
}


/* --- Main Chat Window --- */
#chat-window {
    width: 100%;
    max-width: 600px;
    height: 100%;
    min-height: 70vh; /* Give it a minimum height */
    position: relative;
    display: flex;
    flex-direction: column;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 2px 30px rgba(86, 183, 246, 0.5);
}

#chat-window::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 150%;
    background-image: linear-gradient(180deg, var(--clr-primary-a0), var(--clr-gradient-stop-2));
    animation: rotBGimg 4s linear infinite;
    z-index: 1;
    

}

@keyframes rotBGimg {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

#chat-window::after {
    content: '';
    position: absolute;
    background: var(--clr-surface-a10);
    inset: 4px;
    border-radius: 13px;
    z-index: 2;
    box-shadow: 0 2px 30px rgba(86, 183, 246, 0.3);

}

/* --- Chat Header Styles --- */
#chat-header {
    padding: 0.75rem 1.5rem;
    background-color: var(--clr-surface-a10);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 3;
    flex-shrink: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
[data-theme='light']
.header-title {
    color:var(--clr-dark-a0)
}

.status-dot {
    width: 10px;
    height: 10px;
    background-color: #22c55e;
    border-radius: 50%;
    position: relative;
}

.status-dot::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: #22c55e;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(34, 197, 94, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
    }
}

/* --- Theme Toggle Button --- */
#theme-toggle {
    background: none;
    border: none;
    color: var(--clr-primary-a20);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s, background-color 0.3s, transform 0.3s;
}

#theme-toggle:hover {
    background-color: var(--clr-surface-a20);
    transform: scale(1.1) rotate(15deg);
}


/* --- Message Area --- */
#chat-messages {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    z-index: 3;
}
[data-theme='light'] #chat-messages {
    color: var(--clr-dark-a0);
}
#chat-messages::-webkit-scrollbar {
    width: 8px;
}
#chat-messages::-webkit-scrollbar-track {
    background: transparent;
}
#chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--clr-surface-a30);
    border-radius: 20px;
}

/* --- Individual Messages --- */
.message {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    max-width: 80%;
}
.message .bubble {
    padding: 0.75rem 1rem;
    border-radius: 1.25rem;
    line-height: 1.5;
    transition: background-color 0.3s, color 0.3s;
}
.message.ai {
    align-self: flex-start;
}
.message.ai .bubble {
    background-color: var(--clr-surface-a20);
    border-bottom-left-radius: 0.25rem;
}
.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.message.user .bubble {
    background-color: var(--clr-primary-a0);
    color: var(--clr-dark-a0);
    font-weight: 500;
    border-bottom-right-radius: 0.25rem;
}
[data-theme='light'] .message.user .bubble {
    color: var(--clr-light-a0);
}
.message.error .bubble {
    background-color: transparent;
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

/* --- Input Form --- */
#chat-form {
    display: flex;
    padding: 1rem;
    gap: 0.75rem;
    background-color: var(--clr-surface-a10);
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s, border-color 0.3s;
    position: relative;
    z-index: 3;
    flex-shrink: 0;
}
#chat-input {
    flex-grow: 1;
    background-color: var(--clr-surface-a20);
    border: 1px solid transparent;
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--clr-light-a0);
    font-size: 1rem;
    transition: border-color 0.2s ease-in-out, background-color 0.3s, color 0.3s;
}
[data-theme='light'] #chat-input {
    color: var(--clr-dark-a0);
}
#chat-input:focus {
    outline: none;
    border-color: var(--clr-primary-a0);
}
#chat-form button {
    background-color: var(--clr-primary-a0);
    color: var(--clr-dark-a0);
    border: none;
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}
[data-theme='light'] #chat-form button {
    color: var(--clr-light-a0);
}
#chat-form button:hover {
    background-color: var(--clr-primary-a20);
}
#chat-form button:disabled {
    background-color: var(--clr-surface-a30);
    cursor: not-allowed;
}

/* --- About Section --- */
#about {
    padding: 4rem 2rem;
    background-color: var(--clr-surface-a10);
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    visibility: hidden;
}

#about.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.about-container {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--clr-primary-a0);
    margin-bottom: 2rem;
}

.about-content {
    display: flex;
    align-items: center;
    gap: 3rem;
    text-align: left;
}

.about-text {
    flex: 1;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--clr-surface-a50);
    margin-bottom: 1rem;
}

[data-theme='light'] .about-text p {
    color: var(--clr-dark-a0);
}

.about-text strong {
    color: var(--clr-primary-a20);
    font-weight: 600;
}

.about-image {
    flex: 1;
    max-width: 400px;
}

.about-image img {
    width: 100%;
    border-radius: 1rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* Responsive adjustments for about section */
@media (max-width: 768px) {
    .about-content {
        flex-direction: column;
    }
}

/* --- Features Section --- */
#features {
    padding: 4rem 2rem;
    background-color: var(--clr-surface-a0);
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    visibility: hidden;
}

#features.visible {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--clr-surface-a10);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--clr-primary-a0);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--clr-surface-a50);
    line-height: 1.6;
}

[data-theme='light'] .feature-card p {
    color: var(--clr-dark-a0);
}


/* --- Footer Styles --- */
#footer {
    width: 100%;
    background-color: var(--clr-surface-a0);
    color: var(--clr-light-a0);
    padding: 5px 0 5px 0;
    text-align: center;
    border-top: 2px solid var(--clr-primary-a20);
    box-shadow: 0 -4px 20px rgba(86, 183, 246, 0.1);
    transition: background-color 0.3s, border-color 0.3s;
}
[data-theme='light'] #footer {
    color: var(--clr-dark-a0);
}
.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}
.footer-title {
    font-weight: 700;
    font-size: 13px;
    margin-bottom: 5px;
    color: var(--clr-primary-a20);
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}
.footer-links a {
    color: inherit;
    text-decoration: none;
    font-size: 12px;
    transition: all 0.3s ease;
}
.footer-links a:hover {
    color: var(--clr-primary-a0);
    text-shadow: 0 0 1px var(--clr-primary-a20);
    transform: scale(1.2);
}