:root {
    --bg-color: #ffffff;
    --text-primary: #000000;
    --text-secondary: #555555;
    --accent: #000000;
    --transition-speed: 0.5s;
    --border-radius: 8px;
}

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

body, html {
    width: 100%;
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

/* Header & Logo */
.header {
    width: 100%;
    padding: 40px 20px 20px;
    display: flex;
    justify-content: center;
    z-index: 10;
}

.logo {
    max-height: 40px;
    object-fit: contain;
}

/* Screens */
.screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 40px 80px;
    position: absolute;
    top: 100px;
    bottom: 0;
    left: 0;
    right: 0;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease;
}

.screen.active {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

.screen.hidden {
    display: none;
}

/* Typography & Content Layout */
.content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

h1, h2 {
    font-weight: 600;
    font-size: 2.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

p {
    font-size: 1.125rem;
    line-height: 1.5;
    color: var(--text-secondary);
    font-weight: 300;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-primary);
    font-weight: 400;
}

.highlight {
    font-weight: 500;
    color: var(--text-primary);
}

.divider {
    height: 1px;
    width: 40px;
    background-color: var(--text-primary);
    margin: 16px 0;
}

.instruction {
    margin-bottom: 40px;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(10px);
    animation: fadeInAnimation 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

@keyframes fadeInAnimation {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Buttons */
.footer-action {
    margin-top: auto;
    margin-bottom: 20px;
}

.btn-primary {
    width: 100%;
    padding: 18px 24px;
    background-color: var(--accent);
    color: var(--bg-color);
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1.125rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.btn-primary:hover {
    opacity: 0.9;
}

/* Recording UI */
.record-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 20px;
}

.btn-record {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    background-color: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    outline: none;
}

.mic-icon {
    width: 32px;
    height: 32px;
    fill: var(--accent);
    transition: fill 0.3s ease;
}

.btn-record:hover {
    background-color: #f5f5f5;
}

.btn-record.recording {
    background-color: var(--accent);
    animation: pulse 1.5s infinite;
}

.btn-record.recording .mic-icon {
    fill: var(--bg-color);
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.4);
    }
    70% {
        box-shadow: 0 0 0 20px rgba(0, 0, 0, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
    }
}

.status-text {
    margin-top: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.status-text.recording {
    color: var(--text-primary);
    font-weight: 500;
}

.alt-action {
    margin-top: 40px;
    display: flex;
    justify-content: center;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-family: inherit;
    text-decoration: underline;
    cursor: pointer;
    transition: color 0.2s ease;
}

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

/* Form Styles */
.form-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
}

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

.input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.input-group input {
    padding: 14px 16px;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    outline: none;
}

.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

/* Loading State */
.upload-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 40px;
}

.upload-status.hidden {
    display: none;
}

.spinner {
    width: 30px;
    height: 30px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 12px;
}

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

/* Responsive adjustments */
@media (max-height: 650px) {
    .screen {
        top: 80px;
        padding-bottom: 40px;
    }
    h1, h2 {
        font-size: 2rem;
    }
}