/* ===================================
   PDF to PowerPoint Converter
   Apple/Google-Inspired Clean White Theme
   =================================== */

:root {
    /* Colors - Clean White Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-card: #ffffff;
    --bg-hover: #f0f0f2;

    --accent-primary: #007aff;
    --accent-secondary: #5856d6;
    --accent-light: rgba(0, 122, 255, 0.08);

    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-muted: #86868b;

    --success: #30d158;
    --success-light: rgba(48, 209, 88, 0.1);

    --border-color: #e5e5e7;
    --border-focus: var(--accent-primary);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

/* Core UI cards stay compact */
.upload-card,
.processing-card,
.result-card,
.error-card,
.header,
.whats-new-section {
    max-width: 520px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xs);
}

.logo-text {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: -0.01em;
}

/* Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    width: 100%;
    box-shadow: var(--shadow-md);
}

/* Upload Section */
.upload-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    background: var(--bg-secondary);
}

.upload-zone:hover {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.upload-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--accent-light);
    transform: scale(1.01);
}

.upload-icon-container {
    margin-bottom: var(--spacing-md);
}

.upload-icon {
    width: 56px;
    height: 56px;
    color: var(--accent-primary);
    transition: var(--transition-normal);
}

.upload-zone:hover .upload-icon {
    transform: translateY(-4px);
}

.upload-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.upload-subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* File Info */
.file-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.file-icon {
    width: 24px;
    height: 24px;
    color: var(--accent-primary);
}

.file-name {
    flex: 1;
    font-weight: 500;
    font-size: 0.9375rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.remove-file-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-file-btn:hover {
    color: #ff3b30;
    background: rgba(255, 59, 48, 0.1);
}

.remove-file-btn svg {
    width: 18px;
    height: 18px;
}

/* Mode Selector */
.mode-selector {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mode-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mode-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mode-option {
    cursor: pointer;
}

.mode-option input {
    display: none;
}

.mode-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
}

.mode-option input:checked+.mode-card {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.mode-card:hover {
    background: var(--bg-hover);
}

.mode-option input:checked+.mode-card:hover {
    background: var(--accent-light);
}

.mode-icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-md);
}

.mode-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mode-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.mode-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* Buttons */
.convert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--accent-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
}

.convert-btn:hover {
    background: #0066d6;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.btn-arrow {
    width: 20px;
    height: 20px;
    transition: var(--transition-fast);
}

.convert-btn:hover .btn-arrow {
    transform: translateX(4px);
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--success);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
}

.download-btn:hover {
    background: #28b84d;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(48, 209, 88, 0.25);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.new-convert-btn {
    background: transparent;
    border: none;
    color: var(--accent-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: var(--transition-normal);
    margin-top: var(--spacing-xs);
}

.new-convert-btn:hover {
    background: var(--accent-light);
}

/* Processing Section */
.processing-card {
    text-align: center;
}

.processing-visual {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
}

.pulse-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--accent-light);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.2);
        opacity: 0.5;
    }
}

.processing-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
}

.processing-icon svg {
    width: 100%;
    height: 100%;
}

.processing-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.processing-message {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    transition: width 300ms ease;
}

.progress-text {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
    min-width: 40px;
}

.processing-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    opacity: 0.4;
    transition: var(--transition-normal);
}

.step.active,
.step.completed {
    opacity: 1;
}

.step-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: var(--transition-normal);
}

.step.active .step-dot {
    background: var(--accent-primary);
    box-shadow: 0 0 0 4px var(--accent-light);
}

.step.completed .step-dot {
    background: var(--success);
}

.step-text {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

.step-line {
    width: 32px;
    height: 2px;
    background: var(--border-color);
}

/* Result Section */
.result-card {
    text-align: center;
}

.result-icon-container {
    margin-bottom: var(--spacing-md);
}

.result-icon {
    width: 64px;
    height: 64px;
    color: var(--success);
    animation: checkPop 500ms ease;
}

@keyframes checkPop {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.15);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.result-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.result-subtitle {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 640px) {
    .main-content {
        padding: var(--spacing-md);
    }

    .logo-text {
        font-size: 1.5rem;
    }

    .upload-zone {
        padding: var(--spacing-lg);
    }

    .upload-icon {
        width: 48px;
        height: 48px;
    }

    .step-line {
        width: 16px;
    }
}

/* ===================================
   Unified Version Additional Styles
   =================================== */

/* Center align helper */
.mode-label.center {
    text-align: center;
}

/* App Mode Selector - Compact Horizontal Toggle */
.app-mode-selector {
    margin-bottom: var(--spacing-md);
}

.app-mode-options {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--radius-md);
}

.app-mode-option {
    flex: 1;
    cursor: pointer;
}

.app-mode-option input {
    display: none;
}

.app-mode-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border-radius: var(--radius-sm);
    transition: var(--transition-normal);
}

.app-mode-option input:checked+.app-mode-btn {
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
}

.app-mode-btn:hover {
    background: rgba(0, 0, 0, 0.03);
}

.app-mode-option input:checked+.app-mode-btn:hover {
    background: var(--bg-card);
}

.app-mode-icon {
    font-size: 1.25rem;
}

.app-mode-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
}

.app-mode-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.app-mode-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Converter Mode Selector */
.converter-mode-selector {
    margin-top: var(--spacing-md);
}

.converter-mode-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.converter-mode-option {
    cursor: pointer;
}

.converter-mode-option input {
    display: none;
}

.converter-mode-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    min-height: 52px;
}

.converter-mode-option input:checked+.converter-mode-btn {
    border-color: var(--accent-primary);
    background: var(--accent-light);
}

.converter-mode-btn:hover {
    background: var(--bg-hover);
}

.converter-mode-option input:checked+.converter-mode-btn:hover {
    background: var(--accent-light);
}

.converter-mode-icon {
    font-size: 1.25rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.converter-mode-option input:checked+.converter-mode-btn .converter-mode-icon {
    background: var(--accent-primary);
}

.converter-mode-text {
    display: flex;
    flex-direction: column;
    gap: 0;
    min-width: 0;
}

.converter-mode-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: nowrap;
}

.converter-mode-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* JSON Upload Area */
.upload-zone-small {
    padding: var(--spacing-md);
}

.upload-icon-small {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.upload-title-small {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* JSON Download Section */
.json-download-card {
    text-align: center;
}

.json-icon {
    color: var(--accent-primary);
}

.warning-message {
    background: rgba(255, 204, 0, 0.1);
    border: 1px solid rgba(255, 204, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: #947600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.download-json-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--accent-light);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
}

.download-json-btn:hover {
    background: var(--accent-primary);
    color: white;
}

.download-status {
    color: var(--success);
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: var(--spacing-sm);
    min-height: 1.5em;
}

.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--spacing-md) 0;
}

/* Error Section */
.error-card {
    text-align: center;
}

.error-icon {
    color: #ff3b30;
}

.error-title {
    color: #ff3b30;
}

.error-message {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
    word-break: break-word;
}

/* ===================================
   Authentication Header Styles
   =================================== */

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-bottom: var(--spacing-xs);
}

.auth-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.login-link {
    padding: 8px 16px;
    background: var(--accent-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-normal);
}

.login-link:hover {
    background: #0066d6;
    transform: translateY(-1px);
}

.user-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
}

.user-badge:hover {
    background: var(--bg-hover);
}

.user-email-short {
    font-size: 0.8125rem;
    color: var(--text-primary);
    font-weight: 500;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.plan-badge {
    padding: 2px 8px;
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}

.lang-btn {
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

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

.lang-btn.active {
    background: white;
    color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

/* What's New Section */
.whats-new-section {
    width: 100%;
    max-width: 520px;
    margin-top: 60px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-top: 1px solid var(--border-color);
}

.whats-new-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.whats-new-badge {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.02em;
}

.whats-new-more {
    font-size: 11px;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
    margin-left: auto;
}

.whats-new-more:hover {
    color: var(--accent-primary);
}

.whats-new-content {
    display: flex;
    align-items: center;
    gap: 8px;
}

.whats-new-date {
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.whats-new-text {
    font-size: 12px;
    color: var(--text-secondary);
}

@media (max-width: 640px) {
    .whats-new-section {
        margin-top: 40px;
    }
}