:root {
    --iis-primary: #6366f1;
    --iis-primary-dark: #4f46e5;
    --iis-secondary: #f43f5e;
    --iis-bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    --iis-card-bg: #ffffff;
    --iis-text-main: #1e293b;
    --iis-text-muted: #64748b;
    --iis-border: #e2e8f0;
    --iis-success: #10b981;
    --iis-radius: 16px;
    --iis-shadow-sm: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --iis-shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);

    /* Preset Colors */
    --color-50: #10b981;
    --color-100: #3b82f6;
    --color-200: #f59e0b;
    --color-500: #ef4444;
}

.iis-container {
    width: 100%;
    max-width: 650px;
    margin: 40px auto;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--iis-text-main);
    line-height: 1.5;
    padding: 0 15px;
    /* Better spacing on mobile */
    box-sizing: border-box;
}

.iis-card {
    background: var(--iis-card-bg);
    border-radius: var(--iis-radius);
    padding: 40px;
    box-shadow: var(--iis-shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    box-sizing: border-box;
}

.iis-logo {
    display: flex;
    justify-content: center;
    color: var(--iis-primary);
    margin-bottom: 20px;
    filter: drop-shadow(0 4px 6px rgba(99, 102, 241, 0.2));
}

.iis-header {
    text-align: center;
    margin-bottom: 24px;
}

.iis-header h1 {
    font-size: 32px;
    font-weight: 800;
    margin: 0 0 8px 0;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, var(--iis-primary), var(--iis-primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.iis-header p {
    font-size: 15px;
    color: var(--iis-text-muted);
    margin: 0;
}

.iis-hero-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: #f8fafc;
    padding: 24px;
    border-radius: 16px;
    border: 1px solid var(--iis-border);
}

.iis-control-group label {
    display: block;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--iis-text-muted);
    margin-bottom: 10px;
    letter-spacing: 0.1em;
    text-align: left;
}

/* Upload Area */
.iis-upload-area {
    border: 2px dashed var(--iis-border);
    border-radius: var(--iis-radius);
    padding: 25px 20px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    background: #ffffff;
    position: relative;
    margin-bottom: 24px;
}

.iis-upload-area:hover,
.iis-upload-area.dragging {
    border-color: var(--iis-primary);
    background: #f5f3ff;
    transform: translateY(-2px);
}

.iis-icon {
    color: var(--iis-primary);
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
}

.iis-icon svg {
    width: 32px;
    height: 32px;
}

.iis-upload-text {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.iis-upload-text span {
    color: var(--iis-primary);
    text-decoration: underline;
    text-underline-offset: 4px;
}

.iis-upload-hint {
    font-size: 13px;
    color: var(--iis-text-muted);
}

.iis-hidden {
    display: none !important;
}

/* Processing Section */
.iis-settings-grid {
    display: grid;
    gap: 32px;
    margin-top: 32px;
}

.iis-option-group label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--iis-text-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.iis-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    /* Wrap on small screens */
    gap: 10px;
    margin-bottom: 16px;
}

.iis-label-row label {
    margin-bottom: 0;
}

.iis-toggle-group {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    border-radius: 10px;
    gap: 4px;
}

.iis-toggle-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--iis-text-muted);
    white-space: nowrap;
}

.iis-toggle-btn.active {
    background: white;
    color: var(--iis-primary);
    box-shadow: var(--iis-shadow-sm);
}

.iis-hint {
    font-size: 13px;
    color: var(--iis-text-muted);
    margin-top: 8px;
    font-weight: 500;
}

.iis-file-info {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid var(--iis-border);
}

.iis-preview-container {
    width: 80px;
    height: 80px;
    border-radius: 10px;
    overflow: hidden;
    background: #fff;
    box-shadow: var(--iis-shadow-sm);
    flex-shrink: 0;
}

.iis-preview-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.iis-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

#iis-filename {
    font-weight: 700;
    font-size: 15px;
    color: var(--iis-text-main);
    word-break: break-all;
}

#iis-original-size {
    font-size: 13px;
    color: var(--iis-text-muted);
}

/* Unit Toggle */
.iis-unit-toggle {
    display: flex;
    background: #f1f5f9;
    padding: 3px;
    border-radius: 8px;
    gap: 2px;
    margin-right: 10px;
}

.iis-unit-btn {
    padding: 4px 10px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--iis-text-muted);
}

.iis-unit-btn.active {
    background: var(--iis-primary);
    color: white;
    box-shadow: var(--iis-shadow-sm);
}

/* Format Selector */
.iis-format-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.iis-format-btn {
    position: relative;
    cursor: pointer;
}

.iis-format-btn input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.iis-format-btn span {
    display: block;
    padding: 10px 4px;
    text-align: center;
    background: #fff;
    border: 1.5px solid var(--iis-border);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    transition: all 0.2s;
}

.iis-format-btn:hover span {
    border-color: var(--iis-primary);
    color: var(--iis-primary);
}

.iis-format-btn input:checked+span {
    background: var(--iis-primary);
    border-color: var(--iis-primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.4);
}

/* Presets */
.iis-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.iis-preset-btn {
    padding: 14px 8px;
    background: #fff;
    border: 1.5px solid var(--iis-border);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--iis-text-main);
}

/* Individual Colors for Presets */
.preset-50 {
    border-color: var(--color-50);
    color: var(--color-50);
}

.preset-50:hover,
.preset-50.active {
    background: var(--color-50);
    color: white;
    border-color: var(--color-50);
}

.preset-100 {
    border-color: var(--color-100);
    color: var(--color-100);
}

.preset-100:hover,
.preset-100.active {
    background: var(--color-100);
    color: white;
    border-color: var(--color-100);
}

.preset-200 {
    border-color: var(--color-200);
    color: var(--color-200);
}

.preset-200:hover,
.preset-200.active {
    background: var(--color-200);
    color: white;
    border-color: var(--color-200);
}

.preset-500 {
    border-color: var(--color-500);
    color: var(--color-500);
}

.preset-500:hover,
.preset-500.active {
    background: var(--color-500);
    color: white;
    border-color: var(--color-500);
}

.iis-preset-btn.active {
    box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.2);
    transform: translateY(-1px);
}

.iis-custom-size {
    position: relative;
}

.iis-custom-size input {
    width: 100%;
    padding: 14px 16px;
    padding-right: 50px;
    border: 1.5px solid var(--iis-border);
    border-radius: 10px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
    outline: none;
    box-sizing: border-box;
}

.iis-custom-size input:focus {
    border-color: var(--iis-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.iis-unit {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 700;
    color: var(--iis-text-muted);
}

.iis-main-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(to right, var(--iis-primary), var(--iis-primary-dark));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 700;
    margin-top: 40px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

/* Result Section Spacing */
.iis-error-box {
    background: #fef2f2;
    color: #991b1b;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid #fecaca;
    margin-top: 20px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    animation: iis-shake 0.4s ease-in-out;
}

@keyframes iis-shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

.iis-divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--iis-border), transparent);
    margin: 40px 0;
}

.iis-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 24px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.iis-list-header h3 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
}

.iis-add-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #dbeafe;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.iis-file-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 24px;
    max-height: 350px;
    overflow-y: auto;
    padding-right: 8px;
}

.iis-file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid var(--iis-border);
    transition: all 0.2s;
}

.iis-item-preview {
    width: 44px;
    height: 44px;
    border-radius: 8px;
    object-fit: cover;
    background: #fff;
    border: 1px solid var(--iis-border);
    flex-shrink: 0;
}

.iis-item-info {
    flex: 1;
    min-width: 0;
}

.iis-item-name {
    display: block;
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--iis-text-main);
}

.iis-item-size {
    font-size: 12px;
    color: var(--iis-text-muted);
}

.iis-item-kb-input {
    width: 85px;
    display: flex;
    align-items: center;
    position: relative;
    margin-right: 5px;
    flex-shrink: 0;
}

.iis-item-kb-input input {
    width: 100%;
    padding: 8px 25px 8px 8px;
    border: 1px solid var(--iis-border);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    outline: none;
    box-sizing: border-box;
}

.iis-item-kb-input span {
    position: absolute;
    right: 5px;
    font-size: 10px;
    font-weight: 700;
    color: var(--iis-text-muted);
}

.iis-remove-item {
    padding: 8px;
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
}

/* Settings Footer */
.iis-settings-footer {
    display: flex;
    justify-content: center;
    margin-top: 24px;
}

.iis-toggle-mode-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: #f1f5f9;
    color: var(--iis-text-main);
    border: 1px solid var(--iis-border);
    border-radius: 10px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.iis-toggle-mode-btn:hover {
    background: #e2e8f0;
    border-color: #cbd5e1;
}

.iis-toggle-mode-btn.active {
    background: #eff6ff;
    color: var(--iis-primary);
    border-color: #bfdbfe;
}

.iis-result-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: white;
    border-radius: 14px;
    border: 1px solid #bbf7d0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.iis-result-item-info {
    flex: 1;
    min-width: 0;
    margin-right: 10px;
}

.iis-result-item-info span {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #064e3b;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.iis-result-item-info strong {
    font-size: 12px;
    color: #059669;
}

.iis-item-download {
    padding: 8px 12px;
    background: var(--iis-success);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.iis-result-card {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 16px;
    padding: 32px;
    text-align: center;
}

/* Success Components */
.iis-success-badge {
    width: 48px;
    height: 48px;
    background: var(--iis-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

/* Responsive Overrides */
@media (max-width: 600px) {
    .iis-container {
        padding: 0 10px;
        margin: 20px auto;
    }

    .iis-card {
        padding: 24px 16px;
    }

    .iis-hero-controls {
        padding: 16px 12px;
    }

    .iis-header h1 {
        font-size: 24px;
    }

    .iis-upload-area {
        padding: 20px 12px;
    }

    .iis-upload-text {
        font-size: 15px;
    }

    .iis-format-selector {
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
    }

    .iis-presets {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }

    .iis-format-btn span {
        font-size: 12px;
        padding: 8px 4px;
    }

    .iis-preset-btn {
        font-size: 13px;
        padding: 10px 4px;
    }

    .iis-file-item {
        padding: 12px;
        gap: 10px;
        flex-wrap: wrap;
    }

    .iis-item-preview {
        width: 40px;
        height: 40px;
    }

    .iis-item-info {
        flex: 1;
        min-width: 0;
    }

    .iis-remove-item {
        padding: 4px;
    }

    .iis-item-kb-input {
        width: 100%;
        margin-top: 4px;
        margin-right: 0;
    }

    .iis-result-item {
        padding: 12px;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .iis-item-download {
        width: 100%;
        text-align: center;
        box-sizing: border-box;
    }

    .iis-result-card {
        padding: 20px 16px;
    }

    .iis-stat strong {
        font-size: 20px;
    }

    .iis-main-btn,
    .iis-download-btn,
    .iis-secondary-btn {
        font-size: 15px;
        padding: 14px;
        width: 100%;
        box-sizing: border-box;
    }
}

@media (max-width: 400px) {
    .iis-format-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .iis-label-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}