/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #e0e6ed;
    background: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 25%, #16213e 50%, #0f3460 75%, #0e1b2e 100%);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated background particles */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 200, 255, 0.06) 0%, transparent 50%);
    animation: backgroundFloat 20s ease-in-out infinite;
    pointer-events: none;
    z-index: -1;
}

@keyframes backgroundFloat {
    0%, 100% { 
        opacity: 0.6;
        transform: scale(1) rotate(0deg);
    }
    33% { 
        opacity: 0.8;
        transform: scale(1.1) rotate(120deg);
    }
    66% { 
        opacity: 0.4;
        transform: scale(0.9) rotate(240deg);
    }
}

/* ===== CONTAINER & LAYOUT ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    position: relative;
    z-index: 1;
}

/* ===== HEADER STYLES ===== */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 30px rgba(102, 126, 234, 0.3);
    animation: titleGlow 3s ease-in-out infinite alternate;
    letter-spacing: -0.02em;
}

@keyframes titleGlow {
    0% { text-shadow: 0 0 30px rgba(102, 126, 234, 0.3); }
    100% { text-shadow: 0 0 40px rgba(118, 75, 162, 0.5), 0 0 60px rgba(240, 147, 251, 0.2); }
}

header p {
    font-size: 1.3rem;
    color: #a0aec0;
    font-weight: 400;
    opacity: 0.9;
    animation: fadeInUp 1s ease-out 0.3s both;
}

/* ===== MAIN CONTENT ===== */
main {
    display: grid;
    gap: 2.5rem;
    animation: fadeInUp 1s ease-out 0.5s both;
}

/* ===== MODEL NOTICE ===== */
.model-notice {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(155, 89, 182, 0.1) 100%);
    border: 1px solid rgba(52, 152, 219, 0.3);
    border-radius: 15px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.model-notice::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.model-notice p {
    margin: 0;
    font-size: 1rem;
    color: #e0e6ed;
    position: relative;
    z-index: 1;
}

/* ===== FORM SECTIONS ===== */
.input-section, .output-section {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(20px);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.input-section::before, .output-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.5), transparent);
}

.input-section:hover, .output-section:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.15),
        0 0 0 1px rgba(102, 126, 234, 0.2);
}

/* ===== LABELS ===== */
label {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: #f7fafc;
    margin-bottom: 0.8rem;
    position: relative;
    padding-left: 1rem;
}

label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 16px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* ===== TEXTAREA STYLES ===== */
textarea {
    width: 100%;
    min-height: 200px;
    padding: 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.1) 100%);
    color: #e0e6ed;
    font-size: 1rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    line-height: 1.6;
    resize: vertical;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 
        0 0 0 3px rgba(102, 126, 234, 0.2),
        0 8px 25px rgba(102, 126, 234, 0.15);
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0.2) 100%);
}

textarea::placeholder {
    color: #a0aec0;
    opacity: 0.7;
}

textarea::-webkit-scrollbar {
    width: 12px;
}

textarea::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
}

textarea::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 6px;
    border: 2px solid transparent;
    background-clip: content-box;
}

textarea::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
    background-clip: content-box;
}

/* ===== CONTROLS SECTION ===== */
.controls {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    flex-wrap: wrap;
}

.function-selector {
    flex: 1;
    min-width: 250px;
}

.function-selector label {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

/* ===== SELECT DROPDOWN ===== */
select {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    background: linear-gradient(145deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.1) 100%);
    color: #e0e6ed;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23a0aec0' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 1rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 3rem;
}

select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

select:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

/* ===== BUTTONS ===== */
.generate-btn, .action-btn, .modal-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 140px;
}

.generate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    flex-shrink: 0;
}

.generate-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.4);
}

.generate-btn:hover::before {
    left: 100%;
}

.generate-btn:active {
    transform: translateY(0);
}

.generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== ACTION BUTTONS ===== */
.output-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: flex-end;
}

.action-btn {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    color: #e0e6ed;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.action-btn:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.1) 100%);
    border-color: #667eea;
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.2);
}

/* ===== LOADING ANIMATION ===== */
.loading {
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #667eea);
    background-size: 200% 100%;
    animation: progressBar 2s linear infinite;
}

@keyframes progressBar {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(102, 126, 234, 0.3);
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.1rem;
    color: #a0aec0;
    font-weight: 500;
}

/* ===== FOOTER ===== */
footer {
    text-align: center;
    padding: 3rem 0 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 4rem;
    color: #a0aec0;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.5), transparent);
}

footer p {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    opacity: 0.8;
}

/* ===== MESSAGE BOX ===== */
.message-box {
    position: fixed;
    top: 2rem;
    right: 2rem;
    max-width: 350px;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    color: white;
    font-weight: 500;
    z-index: 1000;
    transform: translateX(400px);
    transition: all 0.3s ease;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.message-box.show {
    transform: translateX(0);
}

.message-box.success {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.9) 0%, rgba(46, 204, 113, 0.9) 100%);
    border: 1px solid rgba(39, 174, 96, 0.3);
}

.message-box.error {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.9) 0%, rgba(236, 112, 99, 0.9) 100%);
    border: 1px solid rgba(231, 76, 60, 0.3);
}

/* ===== MODAL STYLES ===== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal-content {
    background: linear-gradient(145deg, rgba(26, 26, 46, 0.95) 0%, rgba(22, 33, 62, 0.95) 100%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 3rem;
    text-align: center;
    max-width: 500px;
    width: 90%;
    backdrop-filter: blur(20px);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: modalSlideIn 0.4s ease-out;
    position: relative;
}

@keyframes modalSlideIn {
    0% {
        opacity: 0;
        transform: scale(0.9) translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-content h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #f7fafc;
    font-weight: 700;
}

.modal-content p {
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: #e0e6ed;
}

.modal-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    header p {
        font-size: 1.1rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
        gap: 1.5rem;
    }
    
    .function-selector {
        min-width: auto;
    }
    
    .generate-btn {
        width: 100%;
    }
    
    .output-actions {
        flex-direction: column;
        gap: 0.8rem;
    }
    
    .action-btn {
        width: 100%;
    }
    
    .message-box {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
        transform: translateY(-100px);
    }
    
    .message-box.show {
        transform: translateY(0);
    }
    
    .modal-content {
        padding: 2rem;
        margin: 1rem;
    }
    
    textarea {
        min-height: 150px;
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }
    
    .input-section, .output-section, .controls {
        padding: 1.5rem;
    }
    
    .modal-content {
        padding: 1.5rem;
    }
    
    .modal-content h2 {
        font-size: 1.5rem;
    }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
    body {
        background: #000;
        color: #fff;
    }
    
    .input-section, .output-section, .controls {
        border: 2px solid #fff;
        background: rgba(255, 255, 255, 0.1);
    }
    
    button {
        border: 2px solid #fff;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .modal-overlay, .message-box, .loading {
        display: none;
    }
    
    .container {
        max-width: none;
        padding: 0;
    }
    
    .input-section, .output-section {
        border: 1px solid #ccc;
        background: none;
        box-shadow: none;
    }
}