/* KaraVoiceLabs TTS App - Modern CSS
   Copyright © 2025 Abdullah Chaudhary KARA
*/

:root {
    --primary-color: #1e3a8a;
    --secondary-color: #4f46e5;
    --accent-color: #06b6d4;
    --background-dark: #0f172a;
    --background-card: #1e293b;
    --text-light: #f8fafc;
    --text-muted: #94a3b8;
    --error-color: #ef4444;
    --success-color: #10b981;
    --border-radius: 12px;
    --box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background: linear-gradient(135deg, var(--background-dark) 0%, #1a365d 100%);
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 900px;
    background-color: var(--background-card);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
    z-index: 1;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.1) 0%, transparent 70%);
    z-index: -1;
    animation: pulse 15s infinite alternate;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.7;
    }
    100% {
        transform: scale(1);
        opacity: 0.5;
    }
}

.header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2rem;
    text-align: center;
}

.logo {
    max-width: 220px;
    margin-bottom: 1rem;
    animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: gradientText 8s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientText {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-light);
    font-size: 1rem;
    position: relative;
    padding-left: 0.5rem;
}

label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 2px;
}

input, textarea, select {
    width: 100%;
    padding: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    background-color: rgba(15, 23, 42, 0.6);
    color: var(--text-light);
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
    outline: none;
}

input:focus, textarea:focus, select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

textarea {
    min-height: 150px;
    resize: vertical;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: calc(100% - 1rem) center;
    padding-right: 2.5rem;
}

.api-key-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
}

.api-key-info svg {
    margin-right: 0.5rem;
    flex-shrink: 0;
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    width: 100%;
    height: 60px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 7px 14px rgba(0, 0, 0, 0.25);
}

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

.btn-primary::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
}

.btn-primary:hover::after {
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}

.btn-download {
    background-color: var(--success-color);
    color: white;
    margin-top: 1rem;
    display: none;
}

.btn-download.visible {
    display: flex;
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 0.75rem;
}

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

.hidden {
    display: none;
}

.audio-player {
    width: 100%;
    margin-top: 1.5rem;
    border-radius: var(--border-radius);
    background-color: rgba(15, 23, 42, 0.4);
    height: 50px;
}

.error-message {
    background-color: rgba(239, 68, 68, 0.2);
    border-left: 4px solid var(--error-color);
    padding: 1rem;
    margin-top: 1rem;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    color: #fecaca;
    font-size: 0.9rem;
    display: none;
}

.error-message.visible {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive styles */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}

/* Animations for form elements */
.form-group {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s ease-out forwards;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.2s; }
.form-group:nth-child(3) { animation-delay: 0.3s; }
.form-group:nth-child(4) { animation-delay: 0.4s; }
.form-group:nth-child(5) { animation-delay: 0.5s; }

/* Glow effect for active elements */
input:focus, textarea:focus, select:focus {
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

/* Custom audio player styling */
audio::-webkit-media-controls-panel {
    background-color: rgba(30, 41, 59, 0.8);
}

audio::-webkit-media-controls-play-button {
    background-color: var(--accent-color);
    border-radius: 50%;
}

/* Floating particles background effect */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    pointer-events: none;
}

/* Tooltip styles */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--background-dark);
    color: var(--text-light);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    box-shadow: var(--box-shadow);
    font-size: 0.8rem;
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Highlight effect for new features */
.new-feature {
    position: relative;
}

.new-feature::after {
    content: 'NEW';
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: var(--accent-color);
    color: white;
    font-size: 0.6rem;
    padding: 2px 5px;
    border-radius: 4px;
    font-weight: bold;
}