/* --- 1. Setup: Variables & General Styles --- */
:root {
    --bg-url: url('https://www.gstatic.com/earth/social/00_generic_facebook-001.jpg');
    --accent-color: #8a2be2;
    --glass-bg: rgba(25, 26, 46, 0.6);
    --inner-panel-bg: rgba(0, 0, 0, 0.2);
    --text-light: #f0f0f0;
    --border-color: rgba(255, 255, 255, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(rgba(26, 26, 46, 0.7), rgba(26, 26, 46, 0.7)), var(--bg-url);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* --- 2. Title Reveal Animation --- */
.title-reveal {
    position: fixed;
    inset: 0;
    background: #1a1a2e;
    display: grid;
    place-items: center;
    z-index: 100;
    animation: reveal 3s forwards ease-in-out;
}
.title-reveal h1 {
    font-size: 3rem;
    opacity: 0;
    animation: fadeInText 1.5s 0.5s forwards;
}

/* --- 3. Main Layout --- */
.app-content {
    width: 100%;
    max-width: 750px;
    opacity: 0;
    animation: fadeInContent 1s 2.5s forwards;
}
.app-title {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
}
.panel {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    margin-bottom: 25px;
}
.results-display { display: none; }

/* --- 4. Component Styling --- */
.panel-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}
.title-icon {
    color: var(--accent-color);
    margin-right: 12px;
    font-size: 1.2rem;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 50px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}
.drop-zone:hover,
.drop-zone.dragover {
    border-color: rgba(255, 255, 255, 0.5);
    background-color: rgba(255, 255, 255, 0.05);
}
.upload-svg {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 15px;
    transition: all 0.3s ease;
}
.drop-zone:hover .upload-svg {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* --- 5. Buttons --- */
.length-selector,
.summary-actions {
    display: flex;
    gap: 10px;
    width: 100%;
    flex-wrap: wrap;
}

.length-option,
.action-button {
    flex: 1;
    padding: 12px 20px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-light);
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}
.length-option:hover,
.action-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
}
.length-option.active {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: 600;
}
.action-button.copied {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}
.summarize-button {
    width: 100%;
    padding: 16px;
    margin-top: 30px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}
.summarize-button:disabled {
    background-color: #555;
    cursor: not-allowed;
}

/* --- 6. States & Summary --- */
.document-details {
    background: rgba(0,0,0,0.2);
    margin-top: 20px;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    display: none;
}
.processing-indicator {
    text-align: center;
    display: none;
    padding: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}
.summary-container { display: none; }

.length-badge {
    background-color: var(--accent-color);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    text-transform: capitalize;
}
.control-panel {
    background: var(--inner-panel-bg);
    border-radius: 12px;
    padding: 20px;
}
.option-group {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.initial-options {
    margin-top: 30px;
}

.length-heading {
    font-size: 1.2rem;
    font-weight: 500;
    opacity: 0.8;
    margin-bottom: 15px;
}
.summary-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 25px 0 15px;
}
.summary-heading {
    font-size: 1.4rem;
    font-weight: 600;
}
.summary-text {
    margin: 0 0 25px 0;
}
.summary-text ul {
    list-style: none;
    padding: 0;
}
.summary-text li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}
.summary-text li:last-child {
    border-bottom: none;
}
.summary-actions { margin-top: 0; }
.status-message {
    background-color: #ff3b3020;
    color: #ff3b30;
    border: 1px solid #ff3b30;
    padding: 15px;
    border-radius: 12px;
    margin-top: 15px;
    text-align: center;
    display: none;
}

/* --- 7. Keyframe Animations --- */
@keyframes reveal {
    0%, 80% { transform: translateY(0); }
    100% { transform: translateY(-100%); }
}
@keyframes fadeInText { to { opacity: 1; } }
@keyframes fadeInContent { to { opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* --- 8. Mobile Responsiveness --- */
@media (max-width: 768px) {
    .app-title { font-size: 1.8rem; }
    .panel { padding: 20px; }
    .panel-title {
        font-size: 1.3rem;
        text-align: left;
        justify-content: flex-start;
    }
    .length-selector,
    .summary-actions {
        flex-direction: column;
        gap: 8px;
    }
    .length-option,
    .action-button {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    .drop-zone { padding: 40px 20px; }
    .summarize-button {
        padding: 12px;
        font-size: 1rem;
    }
    .document-details { padding: 10px; }
    .summary-heading { font-size: 1.2rem; }
    .summary-text li {
        padding: 10px 0;
        font-size: 0.9rem;
    }
}