/**
 * SMOOTHIE - Hand-drawn Style CSS
 * Colored pencil strokes and rice paper (Xuan paper) texture effects
 */

/* ===================================
   Hand-drawn Color Palette
   Colors inspired by colored pencils
   =================================== */
:root {
    /* Rice Paper Background Colors */
    --paper-base: #fcf8f0;
    --paper-fiber: #f5ebdc;
    --paper-warm: #eee4d2;
    --paper-aged: #dccdb4;

    /* Colored Pencil Palette */
    --pencil-blue: #648cc8;
    --pencil-cyan: #50b4c8;
    --pencil-pink: #dc8298;
    --pencil-orange: #f0aa64;
    --pencil-green: #78b48c;
    --pencil-purple: #a082be;
    --pencil-teal: #5abeb0;
    --pencil-brown: #a08060;
    --pencil-red: #d87070;
    --pencil-yellow: #e8c864;

    /* Shadows - softer, more organic */
    --shadow-pencil: 2px 3px 0 rgba(160, 128, 96, 0.15);
    --shadow-pencil-hover: 3px 4px 0 rgba(160, 128, 96, 0.2);

    /* Hand-drawn border style */
    --border-sketch: 2px solid var(--pencil-brown);
}

/* ===================================
   Base Styles - Rice Paper Background
   =================================== */
html, body {
    background-color: var(--paper-base) !important;
}

body {
    font-family: 'Caveat', 'Comic Neue', 'Patrick Hand', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 隐藏p5.js canvas（纹理已在styles.css中实现） */
#paper-background {
    display: none !important;
}

/* ===================================
   布局修复
   =================================== */
.sidebar {
    width: 300px !important;
}

.main-content {
    margin-left: 80px !important;
}

/* Video/IAV 图片区域放大 */
.video-container {
    max-width: 100% !important;
}

.video-section {
    padding: 2rem !important;
}

.video-wrapper img {
    width: 100% !important;
    max-width: none !important;
}

/* Google Fonts for hand-written look */
@import url('https://fonts.googleapis.com/css2?family=Caveat:wght@400;500;600;700&family=Comic+Neue:wght@300;400;700&family=Patrick+Hand&display=swap');

/* ===================================
   Typography - Hand-written Style
   =================================== */
h1, h2, h3, h4, h5, h6,
.hero-title,
.logo {
    font-family: 'Caveat', 'Comic Neue', cursive !important;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.hero-title {
    font-size: 4.5rem !important;
    color: var(--pencil-blue) !important;
    text-shadow: 3px 3px 0 rgba(100, 140, 200, 0.2);
}

.logo {
    font-size: 2rem !important;
    color: var(--pencil-teal) !important;
}

p, li, a, span, div {
    font-family: 'Patrick Hand', 'Comic Neue', sans-serif;
}

/* ===================================
   Sidebar - Hand-drawn Style
   =================================== */
.sidebar {
    background: linear-gradient(
        180deg,
        var(--paper-base) 0%,
        var(--paper-fiber) 50%,
        var(--paper-warm) 100%
    ) !important;
    border-right: 3px solid var(--pencil-brown) !important;
    box-shadow: 4px 0 0 rgba(160, 128, 96, 0.1) !important;
    position: relative;
}

/* Sketchy border effect using pseudo-element */
.sidebar::after {
    content: '';
    position: absolute;
    top: 0;
    right: -3px;
    width: 3px;
    height: 100%;
    background: repeating-linear-gradient(
        180deg,
        var(--pencil-brown) 0px,
        var(--pencil-brown) 10px,
        transparent 10px,
        transparent 12px
    );
    opacity: 0.3;
}

.sidebar-header {
    background: transparent !important;
    border-bottom: 2px dashed var(--pencil-teal) !important;
    padding-bottom: 1.5rem;
}

/* Logo image - add sketch filter */
.logo-image {
    filter: sepia(10%) saturate(90%) contrast(95%);
    border-radius: 0 !important;
}

.logo-subtitle {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-brown) !important;
    font-size: 0.85rem !important;
}

/* Navigation Links */
.nav-link {
    font-family: 'Patrick Hand', cursive !important;
    font-size: 1.1rem !important;
    color: var(--pencil-brown) !important;
    background: transparent !important;
    border-radius: 0 !important;
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
    position: relative;
}

.nav-link:hover {
    background: rgba(100, 140, 200, 0.1) !important;
    border-left: 3px solid var(--pencil-blue);
    color: var(--pencil-blue) !important;
}

.nav-link.active {
    background: rgba(90, 190, 176, 0.15) !important;
    border-left: 3px solid var(--pencil-teal);
    color: var(--pencil-teal) !important;
    font-weight: 600;
}

/* Underline effect on hover */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 15px;
    right: 15px;
    height: 2px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.nav-link:hover::after {
    transform: scaleX(1);
}

/* ===================================
   Main Content Area
   =================================== */
.main-content {
    background: transparent !important;
}

/* ===================================
   Hero Section - Hand-drawn Style
   =================================== */
.hero-section {
    background: transparent !important;
    position: relative;
}

.hero-content {
    position: relative;
    z-index: 1;
}

/* Hero logo */
.hero-logo {
    filter: sepia(10%) saturate(90%);
    max-width: 150px;
}

.hero-subtitle {
    font-family: 'Patrick Hand', cursive !important;
    font-size: 1.3rem !important;
    color: var(--pencil-brown) !important;
}

.acronym-highlight {
    color: var(--pencil-pink) !important;
    font-weight: 700;
}

.hero-description {
    font-family: 'Patrick Hand', cursive !important;
    font-size: 1.15rem !important;
    color: var(--pencil-brown) !important;
    line-height: 1.8;
}

/* ===================================
   Cards - Hand-drawn Style
   =================================== */
.feature-card,
.citation-paper,
.paper-card,
.faq-item,
.step-card,
.method-card,
.program-card,
.contact-card,
.handdrawn-card {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
    box-shadow: var(--shadow-pencil) !important;
    position: relative;
    overflow: visible !important;
}

/* Sketchy corner decorations */
.feature-card::before,
.citation-paper::before,
.paper-card::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    width: 20px;
    height: 20px;
    border-top: 2px solid var(--pencil-teal);
    border-left: 2px solid var(--pencil-teal);
}

.feature-card::after,
.citation-paper::after,
.paper-card::after {
    content: '';
    position: absolute;
    bottom: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    border-bottom: 2px solid var(--pencil-pink);
    border-right: 2px solid var(--pencil-pink);
}

.feature-card:hover,
.citation-paper:hover,
.paper-card:hover {
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-pencil-hover) !important;
}

/* Override gradient backgrounds on feature cards */
.feature-card[style*="gradient"] {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-blue) !important;
}

.feature-card[style*="gradient"] h3,
.feature-card[style*="gradient"] p {
    color: var(--pencil-brown) !important;
}

/* Feature Icons */
.feature-icon {
    font-size: 2.5rem !important;
    margin-bottom: 1rem;
    filter: grayscale(20%) sepia(30%);
}

/* Card Titles */
.feature-card h3,
.citation-paper h3,
.paper-card h3 {
    font-family: 'Caveat', cursive !important;
    font-size: 1.5rem !important;
    color: var(--pencil-blue) !important;
    border-bottom: 2px dashed var(--pencil-cyan);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

/* ===================================
   Buttons - Hand-drawn Style
   =================================== */
.btn-primary,
.btn-secondary,
.paper-link,
.handdrawn-btn {
    font-family: 'Patrick Hand', cursive !important;
    font-size: 1.1rem !important;
    border-radius: 0 !important;
    border: 2px solid var(--pencil-brown) !important;
    background: var(--paper-base) !important;
    color: var(--pencil-brown) !important;
    box-shadow: var(--shadow-pencil) !important;
    transition: all 0.2s ease;
    position: relative;
}

.btn-primary {
    background: var(--pencil-teal) !important;
    color: white !important;
    border-color: var(--pencil-teal) !important;
}

.btn-primary:hover {
    background: var(--pencil-cyan) !important;
    transform: translate(-2px, -2px);
    box-shadow: 4px 5px 0 rgba(80, 180, 200, 0.3) !important;
}

.btn-secondary:hover,
.paper-link:hover {
    background: var(--paper-fiber) !important;
    transform: translate(-2px, -2px);
    box-shadow: var(--shadow-pencil-hover) !important;
}

/* ===================================
   Form Inputs - Hand-drawn Style
   =================================== */
input[type="text"],
input[type="number"],
input[type="email"],
select,
textarea,
.handdrawn-input {
    font-family: 'Patrick Hand', cursive !important;
    font-size: 1rem !important;
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
    color: var(--pencil-brown) !important;
    box-shadow: inset 2px 2px 0 rgba(160, 128, 96, 0.1) !important;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--pencil-blue) !important;
    outline: none !important;
    box-shadow: inset 2px 2px 0 rgba(100, 140, 200, 0.15) !important;
}

/* Placeholder text */
input::placeholder,
textarea::placeholder {
    color: var(--pencil-brown);
    opacity: 0.5;
    font-style: italic;
}

/* ===================================
   Citation Section
   =================================== */
.citation-section {
    background: var(--paper-fiber) !important;
    border-top: 3px dashed var(--pencil-teal);
    border-bottom: 3px dashed var(--pencil-teal);
}

.citation-section h2 {
    font-family: 'Caveat', cursive !important;
    color: var(--pencil-blue) !important;
    font-size: 2.5rem !important;
}

.paper-title {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-purple) !important;
    font-style: italic;
}

.paper-authors {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-teal) !important;
}

.paper-journal {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-orange) !important;
}

/* BibTeX Box */
.bibtex-box {
    background: var(--paper-warm) !important;
    border: 2px dashed var(--pencil-brown) !important;
    border-radius: 0 !important;
}

.bibtex-box pre {
    font-family: 'Courier New', monospace !important;
    color: var(--pencil-brown) !important;
    font-size: 0.85rem;
}

/* ===================================
   Video/Image Section
   =================================== */
.video-section {
    background: transparent !important;
}

.video-container {
    background: var(--paper-base) !important;
    border: 3px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
    box-shadow: var(--shadow-pencil) !important;
}

.video-title {
    font-family: 'Caveat', cursive !important;
    color: var(--pencil-blue) !important;
    font-size: 2rem !important;
}

.video-description {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-brown) !important;
}

/* Image inside video wrapper */
.video-wrapper img {
    filter: sepia(10%) saturate(90%) contrast(95%);
    border: 2px solid var(--pencil-brown);
}

/* ===================================
   Breadcrumb
   =================================== */
.breadcrumb {
    font-family: 'Patrick Hand', cursive !important;
}

.breadcrumb a {
    color: var(--pencil-blue) !important;
}

.breadcrumb li:not(:last-child)::after {
    color: var(--pencil-brown) !important;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-teal) !important;
    border-radius: 0 !important;
    box-shadow: var(--shadow-pencil) !important;
    color: var(--pencil-teal) !important;
}

.back-to-top:hover {
    background: var(--pencil-teal) !important;
    color: white !important;
    transform: translate(-2px, -2px);
}

/* ===================================
   Mobile Menu Toggle
   =================================== */
.mobile-menu-toggle {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
}

.hamburger-line {
    background: var(--pencil-brown) !important;
}

/* ===================================
   Code Blocks
   =================================== */
pre, code {
    font-family: 'Courier New', monospace !important;
    background: var(--paper-warm) !important;
    border: 2px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
    color: var(--pencil-brown) !important;
}

/* ===================================
   Tables
   =================================== */
table {
    border: 2px solid var(--pencil-brown) !important;
    background: var(--paper-base) !important;
}

th {
    background: var(--paper-fiber) !important;
    font-family: 'Caveat', cursive !important;
    color: var(--pencil-blue) !important;
    border-bottom: 2px solid var(--pencil-brown) !important;
}

td {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-brown) !important;
    border-bottom: 1px dashed var(--pencil-brown) !important;
}

/* ===================================
   Decorative Elements
   =================================== */

/* Doodle-style underlines for headings */
.section-title,
.page-title {
    position: relative;
    display: inline-block;
}

.section-title::after,
.page-title::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(
        90deg,
        var(--pencil-teal) 0%,
        var(--pencil-cyan) 25%,
        var(--pencil-pink) 50%,
        var(--pencil-orange) 75%,
        var(--pencil-teal) 100%
    );
    background-size: 200% 100%;
    animation: underlineShimmer 3s linear infinite;
}

@keyframes underlineShimmer {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

/* Paper texture overlay */
.paper-texture-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    opacity: 0.3;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ===================================
   Animations - Hand-drawn Feel
   =================================== */

/* Slight wobble animation for interactive elements */
@keyframes handWobble {
    0%, 100% { transform: rotate(-0.5deg); }
    50% { transform: rotate(0.5deg); }
}

.feature-card:hover,
.btn-primary:hover,
.btn-secondary:hover {
    animation: handWobble 0.3s ease-in-out;
}

/* ===================================
   Scrollbar - Hand-drawn Style
   =================================== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--paper-fiber);
    border-left: 2px solid var(--pencil-brown);
}

::-webkit-scrollbar-thumb {
    background: var(--pencil-teal);
    border: 2px solid var(--pencil-brown);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--pencil-cyan);
}

/* ===================================
   Selection Highlight
   =================================== */
::selection {
    background: rgba(90, 190, 176, 0.3);
    color: var(--pencil-brown);
}

/* ===================================
   Link Styles
   =================================== */
a {
    color: var(--pencil-blue) !important;
    text-decoration: none;
    border-bottom: 1px dashed var(--pencil-blue);
    transition: all 0.2s ease;
}

a:hover {
    color: var(--pencil-teal) !important;
    border-bottom-color: var(--pencil-teal);
}

/* ===================================
   FAQ Section
   =================================== */
.faq-item {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-brown) !important;
    margin-bottom: 1rem;
}

.faq-question {
    font-family: 'Caveat', cursive !important;
    font-size: 1.3rem !important;
    color: var(--pencil-blue) !important;
}

.faq-answer {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-brown) !important;
}

/* ===================================
   Downloads Page
   =================================== */
.download-card,
.install-step {
    background: var(--paper-base) !important;
    border: 2px solid var(--pencil-brown) !important;
    border-radius: 0 !important;
}

.step-number {
    font-family: 'Caveat', cursive !important;
    font-size: 2rem !important;
    color: var(--pencil-teal) !important;
    border: 2px solid var(--pencil-teal) !important;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===================================
   Contact Page
   =================================== */
.contact-info {
    font-family: 'Patrick Hand', cursive !important;
}

.contact-icon {
    filter: sepia(30%) saturate(80%);
}

/* ===================================
   Generator Page
   =================================== */
.generator-section {
    background: var(--paper-base) !important;
}

.form-group label {
    font-family: 'Caveat', cursive !important;
    font-size: 1.2rem !important;
    color: var(--pencil-blue) !important;
}

.form-help {
    font-family: 'Patrick Hand', cursive !important;
    color: var(--pencil-brown) !important;
    opacity: 0.7;
    font-style: italic;
}

/* ===================================
   Responsive Adjustments
   =================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem !important;
    }

    .feature-card::before,
    .feature-card::after,
    .citation-paper::before,
    .citation-paper::after {
        display: none;
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    body {
        background: white !important;
    }

    .sidebar,
    .back-to-top,
    .mobile-menu-toggle {
        display: none !important;
    }
}