@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&display=swap');

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-color: #f1f5f9;
    --accent-color: #38bdf8;
    --error-color: #ef4444;
    --success-color: #22c55e;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    background-image:
        radial-gradient(at 0% 0%, hsla(253, 16%, 7%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(225, 39%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(339, 49%, 30%, 1) 0, transparent 50%);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    z-index: 10;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

p.subtitle {
    font-size: 1.2rem;
    color: #94a3b8;
    font-weight: 300;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 24px;
    border: var(--glass-border);
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.card:hover {
    box-shadow: 0 35px 60px -15px rgba(0, 0, 0, 0.6);
}

.dropzone {
    border: 2px dashed rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 4rem 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.dropzone:hover,
.dropzone.dragover {
    border-color: var(--accent-color);
    background: rgba(56, 189, 248, 0.05);
}

.dropzone-content {
    pointer-events: none;
}

.icon-upload {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
    filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.5));
}

.btn-select {
    display: inline-block;
    background: var(--primary-gradient);
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    margin-top: 1.5rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
    font-size: 1rem;
}

.btn-select:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -10px rgba(118, 75, 162, 0.5);
}

/* States */
.state-processing,
.state-success,
.state-error {
    display: none;
}

.card.processing .dropzone,
.card.success .dropzone,
.card.error .dropzone {
    display: none;
}

.card.processing .state-processing {
    display: block;
}

.card.success .state-success {
    display: block;
}

.card.error .state-error {
    display: block;
}

/* Loader */
.loader {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 2rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.success-icon {
    font-size: 4rem;
    color: var(--success-color);
    margin-bottom: 1rem;
    animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.error-icon {
    font-size: 4rem;
    color: var(--error-color);
    margin-bottom: 1rem;
}

.file-name {
    margin-top: 1rem;
    font-weight: 600;
    color: var(--accent-color);
}

.btn-download {
    display: inline-block;
    background: var(--success-color);
    color: white;
    text-decoration: none;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    margin-top: 1.5rem;
    transition: transform 0.2s;
}

.btn-download:hover {
    transform: translateY(-2px);
}

.btn-reset {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #94a3b8;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    margin-top: 1rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-reset:hover {
    border-color: white;
    color: white;
}

footer {
    margin-top: 4rem;
    color: #475569;
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.5);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Responsive */
@media (max-width: 600px) {
    h1 {
        font-size: 2.5rem;
    }

    .card {
        padding: 2rem;
    }
}