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

:root {
    --cyber-pink: #ff006e;
    --cyber-blue: #00f5ff;
    --cyber-purple: #8b00ff;
    --cyber-yellow: #ffbe0b;
    --cyber-dark: #0a0e27;
    --cyber-darker: #050816;
    --cyber-card: #151932;
    --cyber-border: #1e2749;
    --text-primary: #e0e6ff;
    --text-secondary: #8892b0;
    --shadow-glow: 0 0 20px rgba(0, 245, 255, 0.3);
}

body {
    font-family: 'Rajdhani', 'Orbitron', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--cyber-darker);
    min-height: 100vh;
    padding: 1rem;
    color: var(--text-primary);
    position: relative;
    overflow-x: hidden;
}

/* Chinese font support for cyber style */
body:lang(zh), body:lang(zh-CN), body:lang(zh-TW) {
    font-family: 'Noto Sans SC', 'ZCOOL XiaoWei', 'PingFang SC', 'Microsoft YaHei', 'Rajdhani', sans-serif;
}

/* Keep English fonts for headers and special elements */
h1, h2, .btn-generate, .lang-btn {
    font-family: 'Orbitron', 'Rajdhani', sans-serif;
}

/* Chinese font for select dropdowns and form elements */
select:lang(zh), select:lang(zh-CN), select:lang(zh-TW),
option:lang(zh), option:lang(zh-CN), option:lang(zh-TW),
label:lang(zh), label:lang(zh-CN), label:lang(zh-TW),
input:lang(zh), input:lang(zh-CN), input:lang(zh-TW) {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(135deg, rgba(255, 0, 110, 0.1) 0%, transparent 50%),
        linear-gradient(225deg, rgba(0, 245, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 20% 80%, rgba(139, 0, 255, 0.15) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    background: var(--cyber-dark);
    border-radius: 0;
    box-shadow: 
        0 0 60px rgba(0, 245, 255, 0.2),
        inset 0 0 60px rgba(255, 0, 110, 0.05);
    overflow: hidden;
    position: relative;
    z-index: 1;
    border: 2px solid var(--cyber-border);
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        var(--cyber-pink) 0%, 
        var(--cyber-purple) 33%, 
        var(--cyber-blue) 66%, 
        var(--cyber-yellow) 100%
    );
}

header {
    background: linear-gradient(135deg, var(--cyber-darker) 0%, var(--cyber-dark) 100%);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    border-bottom: 2px solid var(--cyber-border);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    background: rgba(0, 245, 255, 0.05);
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.language-switcher:hover {
    background: rgba(0, 245, 255, 0.1);
    border-color: var(--cyber-blue);
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.2);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    transition: all 0.3s ease;
    position: relative;
}

.lang-btn:hover {
    color: var(--cyber-blue);
    transform: translateY(-1px);
}

.lang-btn.active {
    color: var(--cyber-blue);
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.lang-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--cyber-blue);
    box-shadow: 0 0 5px var(--cyber-blue);
}

.lang-separator {
    color: var(--cyber-border);
    font-size: 0.9rem;
    user-select: none;
}

header::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyber-blue), transparent);
    animation: scan 3s linear infinite;
}

@keyframes scan {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

header h1 {
    font-size: 1.5rem;
    margin: 0;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--cyber-pink), var(--cyber-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(0, 245, 255, 0.5);
}

.subtitle {
    font-size: 0.7rem;
    margin: 0;
    opacity: 0.8;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 245, 255, 0.1);
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.language-switcher:hover {
    border-color: var(--cyber-blue);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.3);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: 'Rajdhani', sans-serif;
}

.lang-btn:hover {
    color: var(--cyber-blue);
    background: rgba(0, 245, 255, 0.1);
}

.lang-btn.active {
    color: var(--cyber-blue);
    background: rgba(0, 245, 255, 0.2);
    text-shadow: 0 0 10px var(--cyber-blue);
}

.lang-separator {
    color: var(--cyber-border);
    font-size: 0.9rem;
    font-weight: 300;
}

.token-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1.2rem;
    background: linear-gradient(135deg, rgba(255, 190, 11, 0.1), rgba(255, 0, 110, 0.1));
    border: 1px solid rgba(255, 190, 11, 0.3);
    border-radius: 6px;
    animation: pulse-glow 3s ease-in-out infinite;
    transition: all 0.3s ease;
}

.token-notice:hover {
    background: linear-gradient(135deg, rgba(255, 190, 11, 0.15), rgba(255, 0, 110, 0.15));
    border-color: var(--cyber-yellow);
}

.notice-icon {
    font-size: 1rem;
    filter: drop-shadow(0 0 8px rgba(255, 190, 11, 0.5));
}

.notice-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.token-link {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--cyber-blue);
    text-decoration: none;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    background: rgba(0, 245, 255, 0.1);
    border: 1px solid transparent;
    white-space: nowrap;
}

.token-link:hover {
    color: var(--cyber-pink);
    background: rgba(255, 0, 110, 0.15);
    border-color: var(--cyber-pink);
    transform: translateX(2px);
    box-shadow: 0 0 15px rgba(255, 0, 110, 0.3);
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 8px rgba(255, 190, 11, 0.2);
    }
    50% {
        box-shadow: 0 0 15px rgba(255, 190, 11, 0.4), 0 0 25px rgba(255, 0, 110, 0.2);
    }
}

.main-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--cyber-darker);
}

/* 配置面板 */
.config-panel {
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    padding-right: 0.75rem;
}

.config-panel::-webkit-scrollbar {
    width: 6px;
}

.config-panel::-webkit-scrollbar-track {
    background: var(--cyber-border);
    border-radius: 3px;
}

.config-panel::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--cyber-pink), var(--cyber-blue));
    border-radius: 3px;
}

.config-panel::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--cyber-blue), var(--cyber-purple));
}

.form-section {
    background: var(--cyber-card);
    padding: 0.9rem 1rem;
    border-radius: 0;
    margin-bottom: 0.75rem;
    border: 1px solid var(--cyber-border);
    border-left: 3px solid var(--cyber-blue);
    position: relative;
    transition: all 0.3s ease;
}

.form-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -3px;
    width: 3px;
    height: 0;
    background: var(--cyber-pink);
    transition: height 0.3s ease;
}

.form-section:hover::before {
    height: 100%;
}

.form-section:hover {
    border-left-color: var(--cyber-pink);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.1);
}

.form-section h2 {
    font-size: 0.95rem;
    margin-bottom: 0.65rem;
    color: var(--cyber-blue);
    border-bottom: 1px solid var(--cyber-border);
    padding-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 0.7rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 0.7rem;
}

.form-row-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

.form-row-4 {
    grid-template-columns: 1fr 1fr 1fr 1fr;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input[type="text"],
.form-group select {
    width: 100%;
    padding: 0.6rem 0.7rem;
    background: var(--cyber-darker);
    border: 1px solid var(--cyber-border);
    border-radius: 0;
    font-size: 0.85rem;
    transition: all 0.3s;
    color: var(--text-primary);
    font-family: 'Rajdhani', 'Courier New', monospace;
}

/* Chinese font for form elements */
.form-group select:lang(zh),
.form-group select:lang(zh-CN),
.form-group select:lang(zh-TW),
.form-group input[type="text"]:lang(zh),
.form-group input[type="text"]:lang(zh-CN),
.form-group input[type="text"]:lang(zh-TW) {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.form-group input[type="text"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--cyber-blue);
    box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
    background: var(--cyber-dark);
}

.form-group input[type="text"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    text-transform: none;
    font-size: 0.95rem;
}

.checkbox-group input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    margin-right: 0.5rem;
    cursor: pointer;
    accent-color: var(--cyber-blue);
}

/* 上传区域 */
.upload-area {
    position: relative;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: flex-start;
}

.upload-area input[type="file"] {
    display: none;
}

.upload-area > label {
    display: block;
    flex: 1 1 100%;
    transition: all 0.3s ease;
}

.upload-area > label.compact {
    flex: 0 0 auto;
    min-width: 240px;
    max-width: 280px;
}

.upload-placeholder {
    border: 2px dashed var(--cyber-border);
    border-radius: 0;
    padding: 1.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--cyber-darker);
    position: relative;
    overflow: hidden;
}

.upload-area > label.compact .upload-placeholder {
    padding: 1rem;
}

.upload-area > label.compact .upload-icon {
    font-size: 1.8rem;
    margin-bottom: 0.4rem;
}

.upload-area > label.compact .upload-placeholder p {
    font-size: 0.85rem;
    margin: 0.3rem 0;
}

.upload-area > label.compact .upload-placeholder small {
    font-size: 0.7rem;
}

.upload-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(0, 245, 255, 0.1), 
        transparent
    );
    transition: left 0.5s;
}

.upload-placeholder:hover::before {
    left: 100%;
}

.upload-placeholder:hover {
    border-color: var(--cyber-blue);
    background: var(--cyber-card);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.2);
}

.upload-area.dragover .upload-placeholder {
    border-color: var(--cyber-pink);
    background: var(--cyber-card);
    box-shadow: 0 0 30px rgba(255, 0, 110, 0.3);
}

.upload-icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 0.6rem;
    filter: drop-shadow(0 0 10px var(--cyber-blue));
}

.upload-placeholder p {
    color: var(--text-primary);
    margin: 0.5rem 0;
}

.upload-placeholder small {
    color: var(--text-secondary);
}

.preview-container {
    display: flex;
    gap: 1rem;
    margin-top: 0;
    flex-wrap: wrap;
    flex: 1 1 auto;
    align-items: flex-start;
}

.preview-item {
    position: relative;
    flex: 1 1 auto;
    min-width: 220px;
    max-width: calc(50% - 0.5rem);
    border: 2px solid var(--cyber-border);
    border-radius: 0;
    overflow: hidden;
}

.preview-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 2px solid var(--cyber-blue);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1;
}

.preview-item:hover::before {
    opacity: 1;
}

.preview-item img {
    width: 100%;
    height: 120px;
    object-fit: cover;
    display: block;
}

.preview-name {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding: 0.3rem;
    background: var(--cyber-darker);
    font-family: 'Courier New', monospace;
}

.remove-image {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 28px;
    height: 28px;
    border-radius: 0;
    background: var(--cyber-pink);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 0 10px rgba(255, 0, 110, 0.5);
    z-index: 2;
}

.remove-image:hover {
    background: var(--cyber-blue);
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.8);
    transform: scale(1.1);
}

/* 生成按钮 */
.btn-generate {
    width: 100%;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--cyber-pink) 0%, var(--cyber-purple) 100%);
    color: white;
    border: 1px solid var(--cyber-pink);
    border-radius: 0;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 0 20px rgba(255, 0, 110, 0.4);
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
}

.btn-generate::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-generate:hover::before {
    width: 300px;
    height: 300px;
}

.btn-generate:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(255, 0, 110, 0.6);
    border-color: var(--cyber-blue);
}

.btn-generate:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 结果面板 */
.result-panel {
    background: var(--cyber-card);
    padding: 1rem;
    border-radius: 0;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    border: 1px solid var(--cyber-border);
    border-right: 3px solid var(--cyber-pink);
}

.result-panel h2 {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    color: var(--cyber-pink);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* Token Section */
.token-section {
    background: var(--cyber-darker);
    padding: 1rem;
    border-radius: 0;
    margin-bottom: 1rem;
    border: 1px solid var(--cyber-border);
    border-left: 3px solid var(--cyber-yellow);
    position: relative;
    transition: all 0.3s ease;
}

.token-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -3px;
    width: 3px;
    height: 0;
    background: var(--cyber-blue);
    transition: height 0.3s ease;
}

.token-section:hover::before {
    height: 100%;
}

.token-section:hover {
    border-left-color: var(--cyber-blue);
    box-shadow: 0 0 20px rgba(255, 190, 11, 0.1);
}

.token-section h2 {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    color: var(--cyber-yellow);
    border-bottom: 1px solid var(--cyber-border);
    padding-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
}

.token-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.token-input-group input[type="text"] {
    width: 100%;
    padding: 0.75rem 0.9rem;
    background: var(--cyber-card);
    border: 1px solid var(--cyber-border);
    border-radius: 0;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.token-input-group input[type="text"]:focus {
    outline: none;
    border-color: var(--cyber-yellow);
    box-shadow: 0 0 15px rgba(255, 190, 11, 0.3);
    background: var(--cyber-darker);
}

.token-input-group input[type="text"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
    text-transform: uppercase;
}

.token-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.8rem;
    border-radius: 0;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-left: 3px solid;
    transition: all 0.3s;
}

.token-status.valid {
    background: rgba(0, 245, 255, 0.1);
    border-left-color: var(--cyber-blue);
    color: var(--cyber-blue);
}

.token-status.invalid {
    background: rgba(255, 0, 110, 0.1);
    border-left-color: var(--cyber-pink);
    color: var(--cyber-pink);
}

.token-status .status-icon {
    font-size: 1.1rem;
    font-weight: bold;
}

.token-status.valid .status-icon {
    color: var(--cyber-blue);
    text-shadow: 0 0 10px var(--cyber-blue);
}

.token-status.invalid .status-icon {
    color: var(--cyber-pink);
    text-shadow: 0 0 10px var(--cyber-pink);
}

.token-remaining {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 0.8rem;
    background: rgba(0, 245, 255, 0.05);
    border: 1px solid var(--cyber-border);
    border-radius: 0;
    font-family: 'Courier New', monospace;
}

.token-remaining .remaining-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.token-remaining .remaining-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--cyber-blue);
    text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.result-container {
    background: var(--cyber-darker);
    border-radius: 0;
    padding: 1.5rem;
    min-height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--cyber-border);
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder p:first-child {
    font-size: 3rem;
    margin-bottom: 0.75rem;
    filter: drop-shadow(0 0 20px var(--cyber-blue));
}

.placeholder p {
    font-size: 1rem;
    margin: 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.loading {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--cyber-border);
    border-top-color: var(--cyber-blue);
    border-right-color: var(--cyber-pink);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.5);
}

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

.loading p {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 1rem 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.loading small {
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.result-image {
    text-align: center;
}

.result-image img {
    max-width: 100%;
    border-radius: 0;
    box-shadow: 
        0 0 30px rgba(0, 245, 255, 0.3),
        0 0 60px rgba(255, 0, 110, 0.2);
    margin-bottom: 1.5rem;
    border: 2px solid var(--cyber-border);
}

.btn-download {
    display: inline-block;
    padding: 0.9rem 2rem;
    background: linear-gradient(135deg, var(--cyber-blue) 0%, var(--cyber-purple) 100%);
    color: white;
    text-decoration: none;
    border-radius: 0;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 0 20px rgba(0, 245, 255, 0.4);
    text-transform: uppercase;
    letter-spacing: 2px;
    border: 1px solid var(--cyber-blue);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 245, 255, 0.6);
    border-color: var(--cyber-pink);
}

.error {
    text-align: center;
    color: var(--cyber-pink);
}

.error p {
    margin: 0.5rem 0;
}

.error p:first-child {
    font-size: 3rem;
    filter: drop-shadow(0 0 20px var(--cyber-pink));
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .config-panel,
    .result-panel {
        max-height: none;
    }
}

@media (max-width: 640px) {
    body {
        padding: 0.5rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 0.85rem;
        letter-spacing: 1px;
    }

    .main-content {
        padding: 1rem;
        gap: 1rem;
    }

    .preview-item {
        width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .container::before {
        height: 2px;
    }
}