/* Apple-Style Minimalist Light Design System */

:root {
    --bg-light: #f5f5f7;
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(0, 0, 0, 0.06);
    --primary: #0071e3; /* Apple Signature Blue */
    --primary-hover: #0077ed;
    --primary-glow: rgba(0, 113, 227, 0.15);
    --accent: #5e5e6e;
    --text-main: #1d1d1f; /* Apple Charcoal Text */
    --text-muted: #86868b; /* Apple Gray Text */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-lg: 20px;
    --radius-md: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

/* Background soft decorative blurs (Apple style) */
.background-decor {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.35;
}

.bg-glow-1 {
    width: 350px;
    height: 350px;
    background: #ffdbdb; /* Soft pastel pink */
    top: -50px;
    left: -50px;
}

.bg-glow-2 {
    width: 450px;
    height: 450px;
    background: #e3f2fd; /* Soft pastel blue */
    bottom: -100px;
    right: -50px;
}

/* Container */
.container {
    width: 100%;
    max-width: 640px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 5px;
}

.logo {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: inline-block;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    margin-bottom: 6px;
    color: var(--text-main);
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Apple Glassmorphism Card */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: relative;
}

/* Input group */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

textarea {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    min-height: 110px;
    outline: none;
    transition: var(--transition);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

textarea:focus {
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 4px var(--primary-glow), inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

.char-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    align-self: flex-end;
}

/* Controls row */
.controls-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 500px) {
    .controls-row {
        grid-template-columns: 1fr;
    }
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

select {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--radius-md);
    padding: 11px 14px;
    color: var(--text-main);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2386868b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='8 10 12 14 16 10'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
    padding-right: 32px;
}

select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#rate-value {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
}

/* Range input style (Apple macOS style) */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.06);
    border-radius: 2px;
    outline: none;
    margin: 12px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #ffffff;
    border: 0.5px solid rgba(0, 0, 0, 0.15);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(0.95);
    background: #f5f5f7;
}

/* Action button (Apple Blue style) */
.primary-btn {
    width: 100%;
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    padding: 14px;
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 12px rgba(0, 113, 227, 0.15);
}

.primary-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(0, 113, 227, 0.25);
}

.primary-btn:active {
    transform: scale(0.98);
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

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

.primary-btn.loading .btn-text {
    display: none;
}

.primary-btn.loading .btn-loader {
    display: block;
}

/* Audio Player and Waveform Container */
.player-container {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.player-container.hidden {
    display: none;
    opacity: 0;
    transform: translateY(8px);
}

/* Waveform Visualizer (Apple dark grey/blue design) */
.waveform-visualizer {
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
}

.bar {
    width: 4px;
    height: 100%;
    background: #8e8e93; /* Apple secondary grey */
    border-radius: 2px;
    transform: scaleY(0.15);
    transition: transform 0.1s ease;
}

/* Active visualization when playing */
.playing .bar {
    background: var(--primary);
}

/* Custom Audio Player Controls */
.custom-audio-player {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--text-main);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.icon-btn:hover {
    background: #f5f5f7;
    color: var(--primary);
    border-color: rgba(0, 0, 0, 0.15);
}

.hidden {
    display: none !important;
}

.time-scrubber {
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.progress-bar-container {
    flex-grow: 1;
    height: 4px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 2px;
    position: relative;
    cursor: pointer;
}

.progress-bar {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 2px;
}

/* Footer */
footer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 10px;
}

/* Apple iOS Switch Toggle */
.switch-container {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch-container input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(120, 120, 128, 0.16);
    transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 22px;
    border: none;
}

.switch-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 2px;
    bottom: 2px;
    background-color: #ffffff;
    transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.switch-container input:checked + .switch-slider {
    background-color: #34c759; /* Apple iOS Green */
}

.switch-container input:checked + .switch-slider:before {
    transform: translateX(22px);
}

/* Language Switcher Component (Apple segment control) */
.lang-switcher {
    display: flex;
    justify-content: center;
    background: rgba(120, 120, 128, 0.08);
    border: none;
    border-radius: 9px;
    padding: 2px;
    gap: 0;
}

.lang-btn {
    flex: 1;
    background: transparent;
    border: none;
    padding: 6px 12px;
    border-radius: 7px;
    color: var(--text-main);
    font-family: inherit;
    font-weight: 500;
    font-size: 0.82rem;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--text-main);
}

.lang-btn.active {
    background: #ffffff;
    color: var(--text-main);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 1px rgba(0, 0, 0, 0.05);
}

/* Performance Metrics Panel */
.metrics-panel {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: var(--radius-md);
    padding: 12px;
    margin-top: 5px;
}

@media (max-width: 500px) {
    .metrics-panel {
        grid-template-columns: repeat(2, 1fr);
    }
}

.metric-card {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 4px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.metric-card:not(:last-child) {
    border-right: 1px solid rgba(0, 0, 0, 0.06);
}

@media (max-width: 500px) {
    .metric-card:nth-child(even) {
        border-right: none;
    }
    .metric-card {
        padding: 8px 4px;
    }
}

.metric-title {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.metric-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
}