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

body {
    background: rgb(10, 10, 10);
    color: #d4d4d4;
    font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    min-height: 100vh;
    line-height: 1.6;
    font-size: 14px;
}

.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1rem;
    width: 100%;
}

/* Header */
header {
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: #fff;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #a3a3a3;
    font-size: 0.875rem;
}

/* Card */
.card {
    background: rgba(23, 23, 23, 0.5);
    border: 1px solid rgb(39, 39, 39);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

/* Input */
.input-group {
    display: flex;
    gap: 0.75rem;
}

.input-group input {
    flex: 1;
    background: rgb(38, 38, 38);
    border: 1px solid rgb(64, 64, 64);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: #fff;
    font-size: 0.875rem;
    font-family: 'Noto Sans JP', sans-serif;
    outline: none;
    transition: all 0.2s;
}

.input-group input:focus {
    outline: 2px solid rgb(59, 130, 246);
    outline-offset: -1px;
    border-color: transparent;
}

.input-group input::placeholder {
    color: rgb(82, 82, 82);
}

/* Buttons */
.btn-primary {
    background: rgb(37, 99, 235);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: 'Noto Sans JP', sans-serif;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover:not(:disabled) {
    background: rgb(59, 130, 246);
}

.btn-primary:disabled {
    background: rgb(64, 64, 64);
    color: rgb(115, 115, 115);
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

/* Spinner */
.spinner {
    animation: spin 1s linear infinite;
}

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

/* Rate Info */
.rate-info {
    font-size: 0.75rem;
    color: rgb(115, 115, 115);
    margin-top: 0.75rem;
}

/* Alert */
.alert-error {
    padding: 1rem;
    background: rgba(127, 29, 29, 0.2);
    border: 1px solid rgb(127, 29, 29);
    border-radius: 8px;
    color: rgb(252, 165, 165);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

/* Video Card */
.video-card {
    padding: 0;
    overflow: hidden;
}

.thumbnail {
    width: 100%;
    max-height: 360px;
    object-fit: cover;
    display: block;
}

.video-meta {
    padding: 1rem 1.5rem;
}

.video-meta h2 {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.meta-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.meta-item {
    font-size: 0.8rem;
    color: rgb(115, 115, 115);
}

/* Section Title */
.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 1rem;
}

/* Tabs */
.format-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tab {
    background: rgb(38, 38, 38);
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    color: rgb(163, 163, 163);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    font-family: 'Noto Sans JP', sans-serif;
    transition: all 0.2s;
}

.tab:hover {
    color: #fff;
}

.tab.active {
    background: rgb(37, 99, 235);
    color: #fff;
}

/* Format List */
.format-list {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    max-height: 400px;
    overflow-y: auto;
}

.format-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(38, 38, 38, 0.5);
    border: 1px solid rgb(55, 55, 55);
    border-radius: 8px;
    padding: 0.6rem 0.75rem;
    transition: border-color 0.2s;
}

.format-item:hover {
    border-color: rgb(82, 82, 82);
}

.format-label {
    flex: 1;
    font-size: 0.8rem;
    color: #d4d4d4;
}

.format-size {
    color: rgb(115, 115, 115);
    font-size: 0.75rem;
    min-width: 60px;
    text-align: right;
}

.no-formats {
    color: rgb(115, 115, 115);
    text-align: center;
    padding: 2rem;
    font-size: 0.875rem;
}

/* Progress */
.progress-bar {
    background: rgb(38, 38, 38);
    border-radius: 6px;
    height: 8px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    background: rgb(37, 99, 235);
    height: 100%;
    border-radius: 6px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    color: rgb(115, 115, 115);
    font-size: 0.8rem;
    word-break: break-all;
    font-family: monospace;
}

/* Download Button */
.download-btn {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
}

.file-info {
    color: rgb(115, 115, 115);
    font-size: 0.75rem;
    margin-top: 0.5rem;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid rgb(39, 39, 39);
    color: rgb(82, 82, 82);
    font-size: 0.75rem;
}

footer a {
    color: rgb(96, 165, 250);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1rem 0.75rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .input-group {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
    }

    .format-item {
        flex-wrap: wrap;
    }

    .format-size {
        order: 3;
        min-width: auto;
    }
}

/* Scrollbar */
.format-list::-webkit-scrollbar {
    width: 4px;
}

.format-list::-webkit-scrollbar-track {
    background: transparent;
}

.format-list::-webkit-scrollbar-thumb {
    background: rgb(55, 55, 55);
    border-radius: 2px;
}

.format-list::-webkit-scrollbar-thumb:hover {
    background: rgb(82, 82, 82);
}