/* Import Premium Hand-drawn and Readable Typography */
@import url('https://fonts.googleapis.com/css2?family=Architects+Daughter&family=Inter:wght@400;500;600&display=swap');

/* Color Variables, Fonts, and International Layout Tokens */
:root {
    --bg-paper: #fbfaf7;
    --card-bg: #ffffff;
    --ink-charcoal: #2c2a29;
    --ink-gray: #555250;
    --pencil-blue: #4b729f;
    --pencil-blue-light: #e8f0f8;
    --marker-yellow: #f7e8a4;
    --sticky-note: #fefad4;
    --card-shadow: 4px 4px 0px #2c2a29;
    --btn-shadow: 3px 3px 0px #2c2a29;
    --btn-shadow-hover: 5px 5px 0px #2c2a29;
    
    /* Global Resilient Font Stacks with Native Fallbacks for every OS & country */
    --font-drawn: 'Architects Daughter', 'Comic Sans MS', 'Chalkboard SE', 'Comic Neue', 'Caveat', 'Segoe Print', cursive, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: 'Courier New', Courier, ui-monospace, monospace;
}

/* Sketchy Wobble Animation (stable by default, shakes when hovered) */
@keyframes sketchy-wobble {
    0% { transform: translate(0, 0) rotate(0deg); }
    20% { transform: translate(-1px, 1px) rotate(-0.5deg); }
    40% { transform: translate(1px, -1px) rotate(0.5deg); }
    60% { transform: translate(-1px, -1px) rotate(-0.3deg); }
    80% { transform: translate(1px, 1px) rotate(0.3deg); }
    100% { transform: translate(0, 0) rotate(0deg); }
}

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

body {
    background-color: var(--bg-paper);
    /* Blueprint/sketching grid paper background */
    background-image: 
        linear-gradient(rgba(75, 114, 159, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(75, 114, 159, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    color: var(--ink-charcoal);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 1rem;
    line-height: 1.5;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

/* Notebook Container Paper Sheet */
.paper-container {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 880px;
    padding: 3rem 2.5rem;
    border: 2.5px solid var(--ink-charcoal);
    border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
    box-shadow: 6px 6px 0px var(--ink-charcoal);
    position: relative;
    overflow: hidden;
}

/* Red margin line */
.paper-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 45px;
    bottom: 0;
    width: 2px;
    background-color: rgba(220, 100, 100, 0.25);
    pointer-events: none;
    z-index: 1;
}

/* Header Styles */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-left: 1.5rem;
    position: relative;
    z-index: 2;
}

.logo-area {
    display: inline-block;
    position: relative;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.logo-title {
    font-family: var(--font-drawn);
    font-size: 3.5rem;
    font-weight: normal;
    color: var(--ink-charcoal);
    line-height: 1.1;
    transition: transform 0.2s ease;
}

.logo-area:hover .logo-title {
    animation: sketchy-wobble 0.25s infinite linear;
}

.sketchy-underline {
    position: absolute;
    bottom: -6px;
    left: 5%;
    width: 90%;
    height: 10px;
}

.draw-line-svg {
    width: 100%;
    height: 100%;
}

.tagline {
    font-family: var(--font-drawn);
    font-size: 1.25rem;
    color: var(--pencil-blue);
    margin-top: 0.75rem;
}

.header-smiley {
    position: absolute;
    top: 0;
    right: 0;
    opacity: 0.85;
    transition: transform 0.2s ease;
}

.header-smiley:hover {
    animation: sketchy-wobble 0.3s infinite linear;
}

/* Category Navigation */
.category-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2.75rem;
    position: relative;
    z-index: 5;
    flex-wrap: wrap;
}

.category-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1.2rem 3rem;
    background-color: var(--pencil-blue);
    color: #ffffff;
    font-family: var(--font-drawn);
    font-size: 1.75rem;
    font-weight: bold;
    text-decoration: none;
    border: 2.5px solid var(--ink-charcoal);
    border-radius: 120px 15px 100px 12px / 15px 100px 12px 120px;
    box-shadow: var(--btn-shadow);
    cursor: pointer;
    transition: all 0.15s ease;
}

.category-btn:hover {
    background-color: var(--marker-yellow);
    color: var(--ink-charcoal);
    animation: sketchy-wobble 0.2s infinite linear;
    box-shadow: var(--btn-shadow-hover);
}

.category-btn.active-cat {
    background-color: var(--pencil-blue);
    color: #ffffff;
    box-shadow: 6px 6px 0px var(--ink-charcoal);
    transform: translateY(-3px);
}

.category-btn.active-cat:hover {
    background-color: var(--marker-yellow);
    color: var(--ink-charcoal);
}

/* Download Grid Layout */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    z-index: 2;
}

/* Sketchy Cards */
.card {
    background-color: var(--card-bg);
    border: 2px solid var(--ink-charcoal);
    border-radius: 220px 20px 180px 25px / 20px 180px 25px 220px;
    padding: 2rem 1.75rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    animation: sketchy-wobble 0.3s infinite linear;
    box-shadow: 6px 6px 0px var(--ink-charcoal);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.icon-wrapper {
    background-color: var(--marker-yellow);
    border: 2px solid var(--ink-charcoal);
    border-radius: 50% 45% 48% 52% / 48% 52% 50% 45%;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-charcoal);
}

.card-title {
    font-family: var(--font-drawn);
    font-size: 1.6rem;
    font-weight: normal;
    color: var(--ink-charcoal);
}

.card-description {
    color: var(--ink-gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Badges for Info */
.meta-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.badge {
    font-family: var(--font-drawn);
    background-color: var(--pencil-blue-light);
    border: 1.5px solid var(--ink-charcoal);
    border-radius: 6px 12px 8px 10px / 10px 8px 12px 6px;
    padding: 0.15rem 0.6rem;
    font-size: 0.85rem;
    color: var(--pencil-blue);
    font-weight: bold;
}

.badge-size {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--ink-gray);
}

/* Download Buttons */
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--pencil-blue);
    color: #ffffff;
    font-family: var(--font-drawn);
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    border: 2px solid var(--ink-charcoal);
    border-radius: 120px 15px 100px 12px / 15px 100px 12px 120px;
    box-shadow: var(--btn-shadow);
    cursor: pointer;
    transition: all 0.15s ease;
}

.download-btn.btn-secondary {
    background-color: #ffffff;
    color: var(--ink-charcoal);
}

.download-btn:hover {
    background-color: var(--marker-yellow);
    color: var(--ink-charcoal);
    animation: sketchy-wobble 0.2s infinite linear;
    box-shadow: var(--btn-shadow-hover);
}

.download-btn:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0px var(--ink-charcoal);
}

/* Instructions Sticky Notes */
.note-box {
    margin-top: 1.75rem;
    background-color: var(--sticky-note);
    border: 2px solid var(--ink-charcoal);
    border-radius: 8px 12px 6px 14px / 12px 6px 14px 8px;
    padding: 1.25rem;
    box-shadow: 3px 3px 0px rgba(0,0,0,0.08);
}

.note-title {
    font-family: var(--font-drawn);
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--pencil-blue);
    display: block;
    margin-bottom: 0.5rem;
}

.note-list {
    list-style-type: decimal;
    padding-left: 1.2rem;
}

.note-list li {
    font-size: 0.85rem;
    color: var(--ink-gray);
    margin-bottom: 0.4rem;
}

.note-list li code {
    font-family: var(--font-mono);
    background-color: rgba(0, 0, 0, 0.05);
    padding: 0.1rem 0.3rem;
    border-radius: 3px;
    color: var(--ink-charcoal);
}

/* Footer / Quick Setup Guide */
.footer-setup {
    margin-top: 1rem;
    padding-top: 2rem;
    border-top: 2px dashed var(--ink-charcoal);
    position: relative;
    z-index: 2;
}

.setup-heading {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.setup-heading h3 {
    font-family: var(--font-drawn);
    font-size: 1.5rem;
    font-weight: normal;
    color: var(--pencil-blue);
}

.setup-tips {
    list-style-type: none;
    padding-left: 1.5rem;
}

.setup-tips li {
    font-size: 0.95rem;
    color: var(--ink-charcoal);
    margin-bottom: 0.75rem;
    position: relative;
}

.setup-tips li::before {
    content: "✏️";
    position: absolute;
    left: -1.75rem;
    top: 0.05rem;
    font-size: 0.9rem;
}

.footer-credits {
    text-align: center;
    margin-top: 3rem;
    font-family: var(--font-drawn);
    font-size: 0.9rem;
    color: var(--ink-gray);
}

.red-arrow-svg {
    display: block;
    animation: arrow-bob 1.5s infinite ease-in-out;
}

@keyframes arrow-bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(6px); }
}

@media (max-width: 768px) {
    .paper-container {
        padding: 2.5rem 1.5rem;
    }
    .download-grid {
        grid-template-columns: 1fr;
    }
}