/* Base Variables */
:root {
    --bg-main:         #ffffff;
    --bg-subtle:       #f8f9ff;

    --text-primary:    #1a1a1b;
    --text-secondary:  #4a4a4e;
    --text-muted:      #75757a;
    --text-accent:     #6200ee;
    --accent-light:    #bb86fc;
    --accent-dim:      rgba(98, 0, 238, 0.07);
    --accent-gradient: linear-gradient(135deg, #6200ee 0%, #7c4dff 100%);

    --card-bg:         #ffffff;
    --card-border:     #e1e4f3;

    --tool-card-bg:    #ffffff;
    --tool-card-border: #e1e4f3;

    --shadow-soft:     0 10px 30px rgba(98, 0, 238, 0.08);
    --shadow-hover:    0 20px 50px rgba(98, 0, 238, 0.14);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background: var(--bg-subtle);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden;
}

/* Typography */
.gradient-text {
    background: var(--accent-gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.text-green { color: #10b981; }

.hero-section {
    text-align: center;
    margin-top: 2rem;
    margin-bottom: 2rem;
    animation: slideDown 0.8s ease-out forwards;
}

.main-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 300;
    margin-bottom: 2rem;
}

/* Container */
.container {
    width: 100%;
    max-width: 900px;
    padding: 0 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 10;
}

/* Cards */
.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 2.5rem;
    width: 100%;
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--accent-light);
}

.tool-card {
    padding: 0;
    overflow: hidden;
}

/* Tabs */
.tabs-container {
    display: flex;
    overflow-x: auto;
    background: var(--bg-subtle);
    border-bottom: 1px solid var(--card-border);
}

.tabs-container::-webkit-scrollbar {
    height: 4px;
}

.tabs-container::-webkit-scrollbar-thumb {
    background-color: var(--card-border);
    border-radius: 4px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    color: var(--text-accent);
    background: var(--accent-dim);
}

.tab-btn.active {
    color: var(--text-accent);
    border-bottom-color: var(--text-accent);
    background: #ffffff;
}

/* Upload Area */
.upload-area {
    padding: 4rem 2rem;
    text-align: center;
    background: var(--tool-card-bg);
}

.file-input {
    display: none;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--card-border);
    border-radius: 16px;
    padding: 3rem 2rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-subtle);
}

.upload-label:hover, .upload-label.dragover {
    border-color: var(--text-accent);
    background: var(--accent-dim);
}

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

.upload-label h3 {
    font-size: 1.5rem;
    color: var(--text-accent);
    margin-bottom: 0.5rem;
}

.upload-label p {
    color: var(--text-secondary);
}

/* Workspace Area */
.workspace-area {
    padding: 2rem;
}

.workspace-layout {
    display: flex;
    gap: 2rem;
    flex-direction: row;
}

@media (max-width: 768px) {
    .workspace-layout {
        flex-direction: column;
    }
}

.hidden {
    display: none !important;
}

/* Left Column: Preview */
.preview-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-subtle);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--card-border);
}

.img-wrapper {
    width: 100%;
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #e8e8e8;
    background-image: linear-gradient(45deg, #ddd 25%, transparent 25%),
      linear-gradient(-45deg, #ddd 25%, transparent 25%),
      linear-gradient(45deg, transparent 75%, #ddd 75%),
      linear-gradient(-45deg, transparent 75%, #ddd 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    min-height: 200px;
}

.preview-canvas {
    max-width: 100%;
    max-height: 350px;
    object-fit: contain;
}

.image-info {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.image-info span {
    background: var(--card-bg);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    border: 1px solid var(--card-border);
    font-weight: 600;
}

/* Privacy Notice */
.privacy-notice {
    text-align: center;
    font-size: 0.85rem;
    margin-top: 1rem;
    padding: 0.8rem;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    line-height: 1.4;
}

/* Right Column: Controls */
.controls-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-content {
    animation: fadeIn 0.4s ease-out;
}

.tab-content h3 {
    color: var(--text-accent);
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
}

/* UI Elements */
.control-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
}

.control-group label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ui-select, .ui-input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--card-bg);
    outline: none;
    transition: var(--transition);
}

.ui-select:focus, .ui-input:focus {
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.ui-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 8px;
    border-radius: 5px;
    background: var(--card-border);
    outline: none;
    margin-top: 0.5rem;
}

.ui-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-accent);
    cursor: pointer;
    transition: var(--transition);
}

.ui-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.val-badge {
    background: var(--accent-dim);
    color: var(--text-accent);
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.85rem;
}

/* Specific tools */
.est-size-badge {
    font-size: 1.2rem;
    text-align: center;
    font-weight: 800;
    color: var(--text-accent);
    padding: 1rem;
    background: var(--bg-subtle);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.compression-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    flex: 1;
    background: var(--bg-subtle);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--card-border);
}

.stat-box span {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.stat-box strong {
    font-size: 1.2rem;
}

.dimensions-inputs {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.link-icon {
    margin-top: 1rem;
    cursor: pointer;
    color: var(--text-accent);
    font-size: 1.2rem;
    padding: 0.5rem;
    transition: var(--transition);
}

.link-icon.unlocked {
    color: var(--text-muted);
}

.action-buttons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.action-buttons-grid button:nth-child(3) {
    grid-column: span 2;
}

.tool-btn {
    background: var(--bg-subtle);
    border: 1px solid var(--card-border);
    padding: 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tool-btn:hover {
    background: var(--accent-dim);
    color: var(--text-accent);
    border-color: var(--text-accent);
}

.help-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Buttons */
.action-btn {
    background: var(--accent-gradient);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(98, 0, 238, 0.3);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.action-btn.full-width {
    width: 100%;
}

.action-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 12px 28px rgba(98, 0, 238, 0.4);
}

.action-btn:active {
    transform: translateY(1px);
}

.action-btn.success {
    background: linear-gradient(135deg, #0ba360 0%, #3cba92 100%);
    box-shadow: 0 8px 20px rgba(11, 163, 96, 0.35);
}

.action-btn.outline-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--card-border);
    box-shadow: none;
    font-size: 0.95rem;
    padding: 0.6rem 1.5rem;
}

.action-btn.outline-btn:hover {
    background: #fee2e2;
    color: #ef4444;
    border-color: #ef4444;
    transform: translateY(0);
}

.download-section {
    margin-top: auto;
    padding-top: 2rem;
}

/* Tutorial Grid */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    width: 100%;
    margin-bottom: 3rem;
}

.tutorial-card {
    position: relative;
    padding: 2rem;
    text-align: center;
}

.step-num {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    box-shadow: 0 4px 10px rgba(98, 0, 238, 0.3);
}

.step-icon {
    color: var(--accent-light);
    margin-bottom: 1rem;
}

.tutorial-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tutorial-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* SEO Content Section */
.secondary-card {
    padding: 2.5rem;
}

.secondary-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.secondary-card p {
    color: var(--text-secondary);
}

.secondary-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    color: var(--text-secondary);
}

.secondary-card li i {
    margin-top: 0.3rem;
}

/* Ad Spaces */
.ad-space {
    background: var(--bg-subtle);
    border: 1px dashed var(--card-border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 0.8rem;
    border-radius: 8px;
    margin: 1.5rem 0;
}

.header-ad { width: 100%; max-width: 728px; height: 90px; margin-top: 1rem; border: none;}
.footer-ad { width: 100%; max-width: 728px; height: 90px; margin-bottom: 2rem; border: none;}
.side-ad {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 160px;
    height: 600px;
    display: none;
    border: none;
}
.left-ad { left: 1rem; border: none; }
.right-ad { right: 1rem; border: none;}

/* Language Selector */
.language-selector-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 100;
}

.language-dropdown {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    padding: 0.5rem 2rem 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%236200ee%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem top 50%;
    background-size: 0.65rem auto;
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
}

.language-dropdown:hover {
    border-color: var(--text-accent);
    box-shadow: 0 0 12px rgba(98, 0, 238, 0.15);
}

/* Footer */
.main-footer {
    padding: 3rem 1.5rem;
    width: 100%;
    margin-top: auto;
    background: var(--bg-subtle);
    border-top: 1px solid var(--card-border);
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--text-accent);
}

.footer-links .separator {
    color: var(--card-border);
}

.social-links {
    display: flex;
    gap: 1.2rem;
    font-size: 1.5rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
}

.social-links a:hover {
    color: #ffffff;
    background: var(--text-accent);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(98, 0, 238, 0.3);
}

.copyright {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Animations */
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-30px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to   { opacity: 1; transform: scale(1); }
}

@media (min-width: 1400px) {
    .side-ad { display: flex; }
}

@media (max-width: 768px) {
    .glass-card { padding: 1.5rem; }
    .header-ad, .footer-ad { width: 100%; max-width: 320px; height: 100px; }
    .tabs-container { flex-wrap: nowrap; overflow-x: auto; }
}