* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background: #f9f9f9;
    color: #333;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}
body.dark-mode {
    background: #121212;
    color: #ffffff;
}
/* HEADER */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    flex-wrap: wrap;
}
body.dark-mode header {
    background: #1e1e1e;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #4CAF50;
}
body.dark-mode .logo {
    color: #4CAF50;
}
nav {
    display: flex;
    gap: 5px;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}
.tab-btn {
    background: transparent;
    color: #555;
    border: none;
    padding: 8px 16px;
    margin: 0 5px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}
body.dark-mode nav .tab-btn {
    color: #ddd;
}
nav .tab-btn:hover {
    background: #f0f0f0;
}
body.dark-mode nav .tab-btn:hover {
    background: #333;
}
nav .tab-btn.active {
    color: #4CAF50;
    border-bottom: 2px solid #4CAF50;
}
body.dark-mode nav .tab-btn.active {
    color: #4CAF50;
}
.auth-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}
.auth-controls button {
    background: #eee;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}
body.dark-mode .auth-controls button {
    background: #333;
    color: white;
}
.auth-controls button:hover {
    background: #ddd;
}
body.dark-mode .auth-controls button:hover {
    background: #444;
}
/* MODAL STYLES */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
}
.modal-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    width: 400px;
    max-width: 90%;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    position: relative;
}
body.dark-mode .modal-content {
    background: #1e1e1e;
    color: white;
}
.close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 28px;
    cursor: pointer;
    color: #999;
    transition: color 0.3s;
}
body.dark-mode .close {
    color: #ddd;
}
.close:hover {
    color: #333;
}
body.dark-mode .close:hover {
    color: #fff;
}
.modal-content h2 {
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}
body.dark-mode .modal-content h2 {
    color: white;
}
.modal-content form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.modal-content input {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border 0.3s;
}
body.dark-mode .modal-content input {
    background: #222;
    color: white;
    border: 1px solid #444;
}
.modal-content input:focus {
    border-color: #4CAF50;
    outline: none;
}
.password-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}
.password-wrapper input {
    flex: 1;
    padding-right: 40px;
}
.toggle-password {
    position: absolute;
    right: 10px;
    cursor: pointer;
    color: #888;
    font-size: 1.2rem;
    transition: color 0.3s;
}
body.dark-mode .toggle-password {
    color: #aaa;
}
.toggle-password:hover {
    color: #4CAF50;
}
.modal-content button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background 0.3s;
}
.modal-content button:hover {
    background: #45a049;
}
.modal-content a {
    text-align: center;
    color: #4CAF50;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}
.modal-content a:hover {
    text-decoration: underline;
    color: #3d8b40;
}
/* MAIN */
main {
    padding: 30px;
    max-width: 1200px;
    margin: 0 auto;
}
.tab {
    display: none;
    padding: 20px;
    animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.tab.active {
    display: block;
}
h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-align: center;
    color: #333;
}
body.dark-mode h1 {
    color: white;
}
p {
    margin-bottom: 20px;
    text-align: center;
    color: #666;
}
body.dark-mode p {
    color: #aaa;
}
/* TOOLS GRID (HOME) */
.tools-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 40px 20px;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}
/* UPLOAD AREA */
.upload-area {
    background: #fafafa;
    border: 2px dashed #ddd;
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    margin: 30px 0;
}
body.dark-mode .upload-area {
    background: #252525;
    border: 2px dashed #444;
    color: #ddd;
}
.upload-area:hover {
    background: #f0f0f0;
    border-color: #4CAF50;
}
body.dark-mode .upload-area:hover {
    background: #333;
    border-color: #4CAF50;
}
.upload-icon {
    font-size: 2rem;
    margin-bottom: 15px;
    color: #888;
}
body.dark-mode .upload-icon {
    color: #aaa;
}
.btn-upload {
    background: #333;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    margin: 10px 0;
    font-size: 1rem;
    transition: all 0.3s;
}
body.dark-mode .btn-upload {
    background: #444;
}
.btn-upload:hover {
    background: #444;
    transform: translateY(-2px);
}
body.dark-mode .btn-upload:hover {
    background: #555;
}
.upload-area p {
    margin: 10px 0;
    font-size: 0.9rem;
    color: #777;
}
body.dark-mode .upload-area p {
    color: #aaa;
}
.small-text {
    font-size: 0.8rem;
    color: #999;
    margin-top: 10px;
}
body.dark-mode .small-text {
    color: #777;
}
.small-text a {
    color: #4CAF50;
    text-decoration: underline;
    font-weight: bold;
}
.small-text a:hover {
    color: #3d8b40;
}
/* INPUT GROUPS */
.input-group,
.format-selectors {
    display: flex;
    gap: 20px;
    margin: 20px 0;
    flex-wrap: wrap;
    justify-content: center;
}
.input-group label,
.format-selectors > div {
    display: flex;
    flex-direction: column;
    min-width: 150px;
}
.input-group input,
.format-selectors select {
    padding: 10px;
    border: 1px solid #ddd;
    background: #fff;
    color: #333;
    border-radius: 4px;
    font-size: 1rem;
    margin-top: 5px;
    transition: border 0.3s;
}
body.dark-mode .input-group input,
body.dark-mode .format-selectors select {
    background: #222;
    color: white;
    border: 1px solid #444;
}
.input-group input:focus,
.format-selectors select:focus {
    border-color: #4CAF50;
    outline: none;
}
/* BUTTONS */
button:not(.tab-btn):not(.btn-upload) {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: all 0.3s;
    display: inline-block;
}
button:hover:not(.tab-btn):not(.btn-upload):not(:disabled) {
    background: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
button:disabled {
    background: #cccccc;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}
/* COLOR PICKER */
#color-canvas {
    border: 1px solid #444;
    cursor: crosshair;
    display: none;
    max-width: 100%;
    margin-top: 15px;
    border-radius: 8px;
}
body.dark-mode #color-canvas {
    border: 1px solid #666;
}
/* IMAGE GENERATOR */
#generator .input-group {
    margin: 20px 0;
}
#generator input {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    width: 100%;
}
#generator-canvas {
    max-width: 100%;
    max-height: 300px;
    display: block;
    margin: 0 auto;
    border: 1px solid #ddd;
    border-radius: 8px;
}
/* FEATURES SECTION */
.features {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 40px 20px;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto;
}
.feature-card {
    background: white;
    border-radius: 10px;
    padding: 25px;
    text-align: center;
    width: 300px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: all 0.3s;
    cursor: pointer;
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}
body.dark-mode .feature-card {
    background: #1e1e1e;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}
body.dark-mode .feature-card:hover {
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}
.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 15px;
    color: #4CAF50;
}
.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #4CAF50;
}
.feature-card p {
    color: #666;
    font-size: 0.95rem;
    text-align: center;
}
body.dark-mode .feature-card p {
    color: #aaa;
}
/* FOOTER */
footer {
    text-align: center;
    padding: 20px;
    background: white;
    margin-top: 30px;
    font-size: 0.9rem;
    color: #777;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
}
body.dark-mode footer {
    background: #1e1e1e;
    color: #777;
}
/* CANVAS STYLES */
canvas {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }
    nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    .tab-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    .features, .tools-grid {
        gap: 20px;
    }
    .feature-card {
        width: 100%;
        max-width: 300px;
    }
    .input-group,
    .format-selectors {
        flex-direction: column;
        align-items: center;
    }
    .input-group label,
    .format-selectors > div {
        width: 100%;
        max-width: 300px;
    }
}
@media (max-width: 480px) {
    .modal-content {
        width: 95%;
        padding: 20px;
    }
    h1 {
        font-size: 2rem;
    }
    .upload-area {
        padding: 30px 15px;
    }
}