/* Light Mode (Apple HIG inspired) - DEFAULT */
:root {
    --color-bg: #FFFFFF;
    --color-bg-secondary: #F5F5F7;
    --color-text-primary: #1D1D1F;
    --color-text-secondary: #86868B;
    --color-accent: #007AFF;
    --color-accent-hover: #0056B3;
    --color-border: #D2D2D7;
    --color-border-focus: #007AFF;
    --color-success: #34C759;
    --color-error: #FF3B30;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-elevated: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-focus: 0 0 0 3px rgba(0, 122, 255, 0.25);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

/* Dark Mode */
.dark, [data-theme="dark"] {
    --color-bg: #000000;
    --color-bg-secondary: #1C1C1E;
    --color-text-primary: #F5F5F7;
    --color-text-secondary: #98989D;
    --color-accent: #0A84FF;
    --color-accent-hover: #409CFF;
    --color-border: #38383A;
    --color-border-focus: #0A84FF;
    --color-success: #30D158;
    --color-error: #FF453A;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-elevated: 0 4px 12px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

#app {
    width: 100%;
    padding: 2rem;
    display: flex;
    justify-content: center;
}

.container {
    background: var(--color-bg-secondary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    width: 100%;
    max-width: 1400px;
    min-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-elevated);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--color-accent), var(--color-accent-hover));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Grid Layout */
.app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

@media (min-width: 768px) {
    .app-grid {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
}

.upload-section,
.controls-section {
    width: 100%;
}

/* File Upload */
.file-upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.file-upload-zone:hover {
    border-color: var(--color-accent);
    background: rgba(0, 122, 255, 0.05);
    transform: translateY(-2px);
}

.file-upload-zone.dragging {
    border-color: var(--color-accent-hover);
    background: rgba(0, 122, 255, 0.1);
    transform: scale(1.02);
}

.file-upload-zone.selected {
    border-style: solid;
    border-color: var(--color-success);
    background: rgba(52, 199, 89, 0.05);
}

.file-upload-zone.error {
    border-color: var(--color-error);
    background: rgba(255, 59, 48, 0.05);
}

.upload-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    display: block;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

.upload-prompt p {
    color: var(--text-primary);
    font-weight: 600;
}

.upload-prompt .sub-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.upload-prompt .limits {
    font-size: 0.8rem;
    color: rgba(148, 163, 184, 0.6);
    margin-top: 1.5rem;
}

/* Voice Selector */
.voice-label {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.select-wrapper {
    position: relative;
}

.voice-selector {
    width: 100%;
    appearance: none;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 1rem;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.voice-selector:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-focus);
}

.select-arrow {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Buttons */
.process-button {
    width: 100%;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover)) !important;
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    position: relative;
    overflow: hidden;
}

.process-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elevated);
}

.process-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(100%);
    background: #475569 !important;
}

/* Progress Bar */
.progress-bar {
    margin: 1.5rem 0 !important;
}

.progress-track {
    background: rgba(15, 23, 42, 0.5) !important;
    border-radius: var(--radius-full) !important;
    height: 10px !important;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.progress-fill {
    height: 100% !important;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover), var(--color-error)) !important;
    background-size: 200% 100% !important;
    animation: gradientMove 2s linear infinite;
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

/* Download Button */
.download-container {
    margin-top: 1rem;
    animation: slideUp 0.5s ease-out;
}

.download-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    background: rgba(52, 199, 89, 0.1) !important;
    color: var(--color-success) !important;
    border: 1px solid rgba(52, 199, 89, 0.2);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    margin-top: 1rem;
}

.download-button:hover {
    background: rgba(52, 199, 89, 0.2) !important;
    transform: translateY(-1px);
    box-shadow: 0 0 15px rgba(52, 199, 89, 0.2);
}

.download-icon {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Error Message */
.error-message {
    background: rgba(255, 59, 48, 0.1) !important;
    border: 1px solid rgba(255, 59, 48, 0.2);
    color: var(--color-error) !important;
    padding: 0.75rem !important;
    border-radius: var(--radius-md) !important;
    font-size: 0.9rem !important;
    margin-top: 1rem !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-align: left !important;
}

/* Debug Info */
.debug-info {
    font-size: 0.8rem !important;
    color: rgba(148, 163, 184, 0.5) !important;
    margin-top: 0.5rem !important;
    font-family: monospace;
}

/* File Info */
.file-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.file-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
}

.change-file-hint {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Text Input */
.text-input-container {
    width: 100%;
}

.text-input-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    transition: all 0.3s ease;
}

.text-input-zone:focus-within {
    border-color: var(--color-accent);
    background: rgba(0, 122, 255, 0.05);
}

.text-input-textarea {
    width: 100%;
    min-height: 200px;
    background: transparent;
    border: none;
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    outline: none;
}

.text-input-textarea::placeholder {
    color: var(--color-text-secondary);
}

.char-counter {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    text-align: right;
}

.char-count.error {
    color: var(--color-error);
}