/* --- Modern CSS Reset & Variables --- */
:root {
    --bg-main: #09090b;
    --bg-card: #18181b;
    --border-color: #27272a;
    --text-primary: #fafafa;
    --text-muted: #a1a1aa;
    --accent-primary: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.4);
    --gradient-text: linear-gradient(135deg, #a855f7, #3b82f6, #06b6d4);
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
}

body {
    background-color: var(--bg-main); 
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: hidden;
}

/* --- Landing Page Styling --- */
#landing-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 28px 16px;
    text-align: center;
    width: 100%;
    max-width: 800px;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-title {
    font-size: 4.5rem;
    font-weight: 900;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
    line-height: 1.2;
    letter-spacing: 0;
}

.sub-title { 
    color: var(--text-muted); 
    font-size: 1.2rem; 
    margin-bottom: 45px; 
    font-weight: 300;
}

.url-input-container {
    width: 90%;
    max-width: 650px;
    display: flex;
    align-items: center;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 6px 6px 6px 20px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

/* CHANGE: Click ke bajaye ab Hover karne par glow karega */
.url-input-container:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 25px var(--accent-glow);
    transform: translateY(-2px);
}

.url-input-container span { 
    font-size: 1.2rem; 
    margin-right: 12px; 
    opacity: 0.7;
}

input[type="text"] {
    flex: 1;
    background: transparent;
    border: none;
    color: #ffffff;
    font-size: 1.1rem;
    outline: none;
    padding: 12px 0;
}

/* Modern Analyze Button */
.analyze-btn {
    background: var(--gradient-text);
    border: none;
    color: white;
    padding: 10px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 130px; 
    position: relative;
    overflow: hidden;
}

.analyze-btn:hover { opacity: 0.9; transform: scale(1.02); }
.analyze-btn:active { transform: scale(0.98); }

/* Loading State for Button */
.analyze-btn.is-loading {
    background: #2563eb; 
    cursor: not-allowed;
    transform: scale(0.98);
    box-shadow: 0 0 20px var(--accent-primary);
    animation: buttonGlow 1.5s infinite alternate;
}

.btn-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
    display: none;
}

.is-loading .btn-spinner { display: inline-block; }
.is-loading .btn-text { display: none; }
.is-loading::after { content: "Thinking..."; font-size: 0.95rem; }

@keyframes buttonGlow {
    0% { box-shadow: 0 0 10px rgba(59, 130, 246, 0.4); }
    100% { box-shadow: 0 0 25px rgba(59, 130, 246, 0.9), 0 0 10px rgba(168, 85, 247, 0.6); }
}

#status-container {
    margin-top: 30px;
    min-height: 40px;
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 1s ease-in-out infinite;
    display: none;
}

#status-msg { 
    font-weight: 500; 
    font-size: 1.1rem;
}

/* --- Chat Page Styling --- */
#chat-page {
    display: none;
    flex-direction: column;
    width: 100%;
    max-width: 900px;
    height: 100vh;
    height: 100dvh;
    padding: 20px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.active-url-badge {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #34d399;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.active-url-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background-color: #34d399;
    border-radius: 50%;
    box-shadow: 0 0 10px #34d399;
    animation: pulse 2s infinite;
}

.close-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.close-btn:hover { background: var(--bg-card); color: white; border-color: #3f3f46;}

/* --- Link Preview Card --- */
.link-preview-card {
    display: flex;
    background: linear-gradient(145deg, #18181b, #121214);
    border: 1px solid #3f3f46;
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 15px;
    gap: 15px;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    animation: fadeInDown 0.5s ease-out forwards;
}

.preview-img-container {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
    background: #27272a;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.preview-img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none; 
}

.preview-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
    overflow: hidden;
    flex: 1;
}

.preview-title {
    color: #ffffff;
    font-size: 1.05rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preview-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.chat-box {
    flex: 1;
    overflow-y: auto;
    padding: 10px 5px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    scroll-behavior: smooth;
}

.chat-box::-webkit-scrollbar { width: 6px; }
.chat-box::-webkit-scrollbar-thumb { background-color: #3f3f46; border-radius: 10px; }

.msg { 
    padding: 14px 20px; 
    border-radius: 18px; 
    max-width: 80%; 
    line-height: 1.6;
    font-size: 1rem;
    animation: messagePop 0.3s ease-out;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.msg.user { background: linear-gradient(135deg, #2563eb, #3b82f6); color: white; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.bot { background: var(--bg-card); color: #e4e4e7; border: 1px solid var(--border-color); align-self: flex-start; border-bottom-left-radius: 4px; }

.chat-input-container {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 8px;
    margin-top: 15px;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
    transition: all 0.3s;
}

.chat-input-container:focus-within { border-color: #3f3f46; }
.chat-input-container input { padding-left: 15px; }

.send-btn {
    background: var(--text-primary);
    color: var(--bg-main);
    border: none;
    border-radius: 10px;
    padding: 0 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
}
.send-btn:hover { background: #d4d4d8; }

/* --- Animations --- */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.5); opacity: 0.5; } 100% { transform: scale(1); opacity: 1; } }
@keyframes messagePop { from { opacity: 0; transform: translateY(10px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.page-exit { opacity: 0 !important; transform: translateY(-30px) !important; pointer-events: none; }
.page-enter { opacity: 1 !important; transform: translateY(0) !important; }

@media (max-width: 720px) {
    body {
        overflow: hidden;
    }

    #landing-page {
        justify-content: flex-start;
        padding: 72px 18px 24px;
        max-width: none;
    }

    .main-title {
        font-size: 3rem;
        line-height: 1.05;
        margin-bottom: 12px;
    }

    .sub-title {
        width: min(100%, 320px);
        font-size: 1rem;
        line-height: 1.45;
        margin-bottom: 34px;
    }

    .url-input-container {
        width: 100%;
        max-width: 420px;
        display: grid;
        grid-template-columns: auto 1fr;
        gap: 10px 8px;
        padding: 14px;
        border-radius: 18px;
        align-items: center;
    }

    .url-input-container:hover {
        transform: none;
    }

    .url-input-container span {
        margin-right: 0;
        align-self: center;
    }

    .url-input-container input {
        min-width: 0;
        width: 100%;
        font-size: 1rem;
        padding: 8px 0;
    }

    .analyze-btn {
        grid-column: 1 / -1;
        width: 100%;
        min-height: 48px;
        border-radius: 14px;
    }

    #status-container {
        width: 100%;
        max-width: 420px;
        justify-content: center;
        margin-top: 22px;
        padding: 0 8px;
    }

    #status-msg {
        font-size: 0.95rem;
        line-height: 1.35;
        text-align: left;
    }

    #chat-page {
        max-width: none;
        padding: 12px;
    }

    .chat-header {
        gap: 10px;
        padding-bottom: 12px;
        margin-bottom: 12px;
    }

    .active-url-badge {
        min-width: 0;
        flex: 1;
        padding: 8px 10px;
        border-radius: 12px;
        font-size: 0.78rem;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    .active-url-badge::before {
        width: 7px;
        height: 7px;
        flex: 0 0 auto;
    }

    .close-btn {
        flex: 0 0 auto;
        padding: 8px 10px;
        font-size: 0.82rem;
    }

    .link-preview-card {
        gap: 10px;
        padding: 10px;
        border-radius: 10px;
        margin-bottom: 10px;
    }

    .preview-img-container {
        width: 54px;
        height: 54px;
        border-radius: 8px;
        font-size: 20px;
    }

    .preview-title {
        font-size: 0.95rem;
    }

    .preview-desc {
        font-size: 0.78rem;
        line-height: 1.3;
    }

    .chat-box {
        gap: 12px;
        padding: 6px 2px 4px;
    }

    .msg {
        max-width: 92%;
        padding: 12px 14px;
        border-radius: 15px;
        font-size: 0.94rem;
        line-height: 1.5;
        overflow-wrap: anywhere;
    }

    .chat-input-container {
        gap: 8px;
        padding: 7px;
        margin-top: 10px;
        border-radius: 14px;
    }

    .chat-input-container input {
        min-width: 0;
        padding-left: 8px;
        font-size: 0.95rem;
    }

    .send-btn {
        min-width: 64px;
        padding: 0 14px;
        border-radius: 10px;
    }
}

@media (max-width: 390px) {
    #landing-page {
        padding-top: 54px;
    }

    .main-title {
        font-size: 2.55rem;
    }

    .sub-title {
        margin-bottom: 28px;
    }

    .url-input-container {
        padding: 12px;
    }

    #chat-page {
        padding: 10px;
    }

    .close-btn {
        max-width: 76px;
        overflow: hidden;
        white-space: nowrap;
    }

    .preview-img-container {
        width: 48px;
        height: 48px;
    }
}