:root {
    --bg-gradient: linear-gradient(135deg, #833ab4, #fd1d1d, #fcb045);
    --card-bg: rgba(255, 255, 255, 0.1);
    --text-color: #ffffff;
    --font-family: 'Inter', sans-serif;
}

body {
    font-family: var(--font-family);
    background: var(--bg-gradient);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: var(--text-color);
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.wrapped-container {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    box-sizing: border-box;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin: 0;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-top: 0.5rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stats-grid .total-messages {
    grid-column: 1 / -1;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    font-size: 1rem;
    margin: 0 0 0.5rem 0;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.card .number {
    font-size: 2.5rem;
    font-weight: 800;
}

.top-friends {
    text-align: left;
    padding: 2rem;
}

.friend-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.friend-list li {
    display: flex;
    align-items: center;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.friend-list li:last-child {
    border-bottom: none;
}

.rank {
    font-weight: 800;
    font-size: 1.2rem;
    width: 40px;
    color: #fcb045;
}

.name {
    flex-grow: 1;
    font-weight: 600;
    font-size: 1.1rem;
}

.count {
    opacity: 0.7;
    font-size: 0.9rem;
}

.empty {
    text-align: center;
    opacity: 0.6;
    font-style: italic;
}

.upload-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.upload-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    max-width: 500px;
    width: 100%;
}

.upload-card h2 {
    margin: 0 0 0.5rem 0;
    font-size: 1.8rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    color: white;
    font-family: var(--font-family);
    font-size: 1rem;
    box-sizing: border-box;
}

.form-group input[type="text"]::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.form-group input[type="text"]:focus,
.form-group input[type="file"]:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.6);
}

.form-group input[type="file"]::file-selector-button {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    color: white;
    cursor: pointer;
    margin-right: 1rem;
}

.form-group input[type="file"]::file-selector-button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.hint {
    font-size: 0.85rem;
    opacity: 0.7;
    margin: 0.5rem 0 0 0;
}

.analyze-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    border-radius: 10px;
    color: white;
    font-family: var(--font-family);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.analyze-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.analyze-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: linear-gradient(135deg, #6b6b6b, #4a4a4a);
    box-shadow: none;
    filter: grayscale(100%);
}