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

/* Variables */
:root {
    /* Brand Colors */
    --primary-blue: #5C5FEF;
    --hover-blue: #4A4DDB;
    --active-blue: #3F42CC;
    --success-green: #34D399;

    /* Claude AI-inspired colors */
    --claude-bg: #FFFFFF;
    --claude-text: #1A1A1A;
    --claude-secondary: #6B7280;
    --claude-accent: #5C5FEF;
    --claude-border: #E5E7EB;
    --claude-hover: #F3F4F6;

    /* Functional colors */
    --text-primary: var(--claude-text);
    --text-secondary: var(--claude-secondary);
    --background-light: var(--claude-hover);
    --border-color: var(--claude-border);
    --shadow-color: rgba(0, 0, 0, 0.08);

    /* Animation curves */
    --animation-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --animation-spring: cubic-bezier(0.68, -0.6, 0.32, 1.6);

    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
    --heading-font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --font-size-base: 16px;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.875rem;
    --spacing-base: 1rem;
    --color-primary: #0066FF;
    --color-background: #ffffff;
    --color-surface: #f7f7f8;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-border: #e5e5e5;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--claude-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--claude-text);
}

.app-container {
    width: 100%;
    max-width: 800px;
    background: var(--claude-bg);
    border-radius: 20px;
    box-shadow: 0 4px 24px var(--shadow-color);
    overflow: hidden;
    position: relative;
    transition: transform 0.3s var(--animation-bounce);
    margin: 20px auto;
    height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

.app-container:hover {
    transform: translateY(-2px);
}

/* Header */
.header {
    padding: 24px 32px;
    text-align: center;
    flex-shrink: 0;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 20px;
}

.logo-circle {
    width: 44px;
    height: 44px;
    background: var(--claude-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s var(--animation-spring);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.logo-circle::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.logo-circle:hover {
    transform: scale(1.05) rotate(5deg);
    box-shadow: 0 4px 12px rgba(92, 95, 239, 0.3);
}

.logo-circle:hover::before {
    transform: translateX(100%);
}

.logo-circle svg {
    width: 24px;
    height: 24px;
    stroke: white;
    transition: transform 0.5s var(--animation-spring);
}

.logo-circle:hover svg {
    transform: scale(1.1) rotate(-5deg);
}

.logo-container span {
    font-size: 24px;
    color: var(--claude-text);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header h1 {
    font-size: 32px;
    color: var(--claude-text);
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.header p {
    font-size: 18px;
    color: var(--claude-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.6;
    font-weight: 400;
}

/* Input Section */
.input-section {
    padding: 16px 32px;
    background: var(--claude-bg);
    flex-shrink: 0;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--claude-hover);
    border-radius: 16px;
    transition: all 0.3s var(--animation-bounce);
    border: 2px solid transparent;
}

.search-container:focus-within {
    background: var(--claude-bg);
    border-color: var(--claude-accent);
    box-shadow: 0 0 0 4px rgba(92, 95, 239, 0.1);
    transform: translateY(-1px);
}

.search-icon {
    position: absolute;
    left: 20px;
    stroke: var(--claude-secondary);
    stroke-width: 2;
}

.search-input {
    flex: 1;
    padding: 18px 20px 18px 52px;
    border: none;
    border-radius: 16px;
    font-size: 17px;
    font-weight: 400;
    outline: none;
    background: transparent;
    color: var(--claude-text);
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.search-input::placeholder {
    color: var(--claude-secondary);
    opacity: 0.8;
}

.input-actions {
    display: flex;
    gap: 12px;
    padding-right: 16px;
}

.mic-button,
.send-button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    position: relative;
    transition: all 0.3s var(--animation-spring);
    overflow: hidden;
}

.mic-button::before,
.send-button::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--claude-accent);
    opacity: 0;
    transition: opacity 0.3s ease;
    border-radius: inherit;
}

.mic-button:hover::before,
.send-button:hover::before {
    opacity: 0.1;
}

.mic-button:active::before,
.send-button:active::before {
    opacity: 0.2;
}

.button-feedback {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    transform: scale(0.8);
    opacity: 0;
    background: var(--claude-accent);
    transition: all 0.4s var(--animation-spring);
}

.mic-button:active .button-feedback,
.send-button:active .button-feedback {
    transform: scale(1.2);
    opacity: 0.2;
}

/* Gradient Line */
.gradient-line {
    height: 2px;
    background: linear-gradient(90deg, var(--claude-accent), var(--success-green));
    margin: 0 32px;
    transform-origin: left;
    opacity: 0.8;
}

/* Welcome Section */
.welcome-section {
    padding: 32px;
    text-align: center;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 200px;
}

.sparkle {
    font-size: 36px;
    margin-bottom: 20px;
    display: inline-block;
}

.welcome-section h2 {
    font-size: 28px;
    color: var(--claude-text);
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.welcome-section p {
    font-size: 17px;
    color: var(--claude-secondary);
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
}

/* Footer Tabs */
.footer-tabs {
    display: flex;
    border-top: 1px solid var(--claude-border);
    padding: 16px 32px;
    gap: 32px;
    flex-shrink: 0;
    background: var(--claude-bg);
}

.tab {
    background: none;
    border: none;
    padding: 10px 0;
    font-size: 16px;
    color: var(--claude-secondary);
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab::before {
    content: '';
    position: absolute;
    bottom: -17px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--claude-accent);
    transform: scaleX(0);
    opacity: 0;
    transition: all 0.3s var(--animation-spring);
}

.tab:hover::before {
    transform: scaleX(0.5);
    opacity: 0.5;
}

.tab.active::before {
    transform: scaleX(1);
    opacity: 1;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes slideRight {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        transform: scaleX(0);
    }

    to {
        transform: scaleX(1);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* Motion Classes */
.motion-fade {
    opacity: 0;
    animation: fadeIn 0.6s ease-out forwards;
}

.motion-slide-up {
    opacity: 0;
    transform: translateY(20px);
    animation: slideUp 0.6s ease-out forwards;
}

.motion-slide-right {
    opacity: 0;
    transform: translateX(-20px);
    animation: slideRight 0.6s ease-out forwards;
}

.motion-scale {
    transition: transform 0.3s var(--animation-spring);
}

/* Responsive Design */
@media (max-width: 640px) {
    .app-container {
        border-radius: 16px;
    }

    .header {
        padding: 32px 24px;
    }

    .header h1 {
        font-size: 28px;
    }

    .logo-container span {
        font-size: 22px;
    }

    .search-input {
        font-size: 16px;
        padding: 16px 16px 16px 48px;
    }

    .input-section,
    .welcome-section {
        padding: 20px 24px;
    }

    .footer-tabs {
        padding: 16px 24px;
        gap: 24px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* PDF Upload Section */
.pdf-section {
    padding: 16px 32px;
    background: var(--claude-bg);
    flex-shrink: 0;
}

.upload-container {
    border: 2px dashed var(--claude-border);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s var(--animation-bounce);
    background: var(--claude-hover);
}

.upload-container.drag-over {
    border-color: var(--claude-accent);
    background: rgba(92, 95, 239, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    width: 48px;
    height: 48px;
    stroke: var(--claude-secondary);
    margin-bottom: 16px;
}

.upload-container p {
    color: var(--claude-secondary);
    font-size: 16px;
    margin: 0;
}

.upload-button {
    background: none;
    border: none;
    color: var(--claude-accent);
    font-weight: 500;
    cursor: pointer;
    padding: 0;
    margin: 0;
    font-size: inherit;
    font-family: inherit;
    transition: color 0.3s ease;
}

.upload-button:hover {
    color: var(--hover-blue);
    text-decoration: underline;
}

/* PDF Viewer Section */
.pdf-viewer-section {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    margin: 0 32px 16px;
}

.pdf-controls {
    padding: 16px;
    border-bottom: 1px solid var(--claude-border);
    background: var(--claude-hover);
}

.voice-controls {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 16px;
}

.voice-select {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--claude-border);
    background: var(--claude-bg);
    color: var(--claude-text);
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.voice-select:hover {
    border-color: var(--claude-accent);
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

.speed-control label {
    color: var(--claude-secondary);
    font-size: 14px;
}

.speed-control input[type="range"] {
    width: 100px;
    height: 4px;
    background: var(--claude-border);
    border-radius: 2px;
    -webkit-appearance: none;
}

.speed-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--claude-accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.3s var(--animation-spring);
}

.speed-control input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.speed-control span {
    color: var(--claude-secondary);
    font-size: 14px;
    min-width: 32px;
}

.playback-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.control-button {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    border-radius: 50%;
    transition: all 0.3s var(--animation-spring);
}

.control-button:hover {
    background: rgba(92, 95, 239, 0.1);
}

.control-button svg {
    width: 24px;
    height: 24px;
    stroke: var(--claude-accent);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 16px;
}

.progress-bar {
    flex: 1;
    height: 4px;
    background: var(--claude-border);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: var(--claude-accent);
    border-radius: 2px;
    width: 0;
    transition: width 0.1s linear;
}

.time-display {
    color: var(--claude-secondary);
    font-size: 14px;
    font-variant-numeric: tabular-nums;
}

.pdf-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    min-height: 200px;
}

.pdf-content canvas {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto;
}

/* Text highlighting */
.text-layer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    color: transparent;
    pointer-events: none;
}

.text-layer>span {
    position: absolute;
    white-space: pre;
    cursor: text;
    transform-origin: 0% 0%;
}

.text-layer .highlighted {
    background: rgba(92, 95, 239, 0.2);
    border-radius: 2px;
}

/* Responsive adjustments */
@media (max-width: 640px) {

    .pdf-section,
    .pdf-viewer-section {
        margin: 0 24px;
    }

    .voice-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }

    .speed-control {
        justify-content: space-between;
    }

    .playback-controls {
        justify-content: center;
    }
}

/* Add smooth scrollbar styling */
.welcome-section::-webkit-scrollbar,
.pdf-content::-webkit-scrollbar {
    width: 8px;
}

.welcome-section::-webkit-scrollbar-track,
.pdf-content::-webkit-scrollbar-track {
    background: var(--claude-hover);
    border-radius: 4px;
}

.welcome-section::-webkit-scrollbar-thumb,
.pdf-content::-webkit-scrollbar-thumb {
    background: var(--claude-border);
    border-radius: 4px;
    transition: background 0.3s ease;
}

.welcome-section::-webkit-scrollbar-thumb:hover,
.pdf-content::-webkit-scrollbar-thumb:hover {
    background: var(--claude-secondary);
}

/* Star Animation */
@keyframes starRotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.star-icon {
    color: white;
    animation: starRotate 20s linear infinite;
}

.star-icon:hover {
    animation-duration: 2s;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    justify-content: center;
}

/* Learning Path */
.learning-path {
    margin-top: auto;
    padding: 1rem;
    border-radius: var(--radius-md);
    background: var(--color-surface);
}

.learning-path-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.learning-path-tab {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    border: none;
    background: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.learning-path-tab.active {
    color: var(--color-primary);
    font-weight: 500;
}

.learning-path-tab.active::after {
    content: '';
    position: absolute;
    bottom: -0.75rem;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-primary);
}

/* Ripple Effect */
.ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: ripple 0.6s linear;
    background-color: rgba(0, 0, 0, 0.1);
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Hide scrollbar but keep functionality */
::-webkit-scrollbar {
    display: none;
}

* {
    -ms-overflow-style: none;
    scrollbar-width: none;
}