style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
};
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); /* deep slate gradient */
    color: #f1f5f9;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}
.container {
    background: linear-gradient(145deg, #1e293b 0%, #334155 100%); /* layered slate */
    border: 1px solid rgba(20, 184, 166, 0.1);
    border-radius: 20px;
    box-shadow: 
        0 20px 50px rgba(0, 0, 0, 0.6),
        0 0 0 1px rgba(20, 184, 166, 0.05);
    max-width: 1000px;
    width: 100%;
    padding: 32px;
}
h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #14b8a6 0%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}
.wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: space-between;
}
.editor-panel {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}
.filter, .rotate {
    background: linear-gradient(145deg, #475569 0%, #64748b 100%);
    border: 1px solid rgba(20, 184, 166, 0.15);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
.title {
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 16px;
    display: block;
    color: #14b8a6;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.options {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}
.options button {
    padding: 12px 18px;
    background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
    border: 1px solid rgba(20, 184, 166, 0.2);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9rem;
    font-weight: 500;
    color: #cbd5e1;
}
.options button:hover {
    background: linear-gradient(145deg, #14b8a6 0%, #06b6d4 100%);
    border-color: rgba(20, 184, 166, 0.4);
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(20, 184, 166, 0.3);
}
.options button.active {
    background: linear-gradient(145deg, #14b8a6 0%, #06b6d4 100%);
    border-color: #14b8a6;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(20, 184, 166, 0.4);
}
.slider {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.filter-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #94a3b8;
    font-weight: 500;
}
input[type="range"] {
    width: 100%;
    appearance: none;
    height: 8px;
    background: linear-gradient(to right, #0f172a 0%, #475569 100%);
    border-radius: 6px;
    outline: none;
    border: 1px solid rgba(20, 184, 166, 0.2);
}
input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: linear-gradient(145deg, #14b8a6 0%, #06b6d4 100%);
    border: 2px solid #ffffff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(20, 184, 166, 0.4);
    transition: all 0.3s ease;
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(20, 184, 166, 0.6);
}
.preview-img {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(145deg, #334155 0%, #475569 100%);
    border: 2px solid rgba(20, 184, 166, 0.1);
    border-radius: 16px;
    min-height: 400px;
    overflow: hidden;
    position: relative;
}
.preview-img::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 49%, rgba(20, 184, 166, 0.03) 50%, transparent 51%);
    pointer-events: none;
}
.preview-img img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 12px;
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.3));
}
.controls {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
.controls .row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}
.controls button, .choose-img {
    padding: 14px 28px;
    background: linear-gradient(145deg, #14b8a6 0%, #06b6d4 100%);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 6px 16px rgba(20, 184, 166, 0.3);
}
.controls button:hover {
    background: linear-gradient(145deg, #0d9488 0%, #0284c7 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(20, 184, 166, 0.4);
}
.reset-filter {
    background: linear-gradient(145deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 6px 16px rgba(239, 68, 68, 0.3);
}
.reset-filter:hover {
    background: linear-gradient(145deg, #dc2626 0%, #b91c1c 100%);
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.4);
}
.file-input {
    display: none;
}
.visually-hidden {
    position: absolute;
    left: -9999px;
}
@media (max-width: 768px) {
    .wrapper {
        flex-direction: column;
    }
    .preview-img {
        min-height: 300px;
    }
    .container {
        padding: 24px;
    }
    h2 {
        font-size: 1.8rem;
    }
}: