/* ==========================================================================
   InkPlanes Stylesheet
   Design System: Paper & Ink (Light) vs Blueprint & Chalk (Dark)
   ========================================================================== */

/* Google Fonts Import in HTML, using here */
:root {
    /* Fonts */
    --font-primary: 'Plus Jakarta Sans', sans-serif;
    --font-accent: 'Gaegu', cursive;

    /* Light Theme (Notebook Paper) */
    --bg-color: #FAF8F2;
    --text-primary: #1E252B;
    --text-secondary: #4A5660;
    --grid-color: rgba(58, 134, 200, 0.08);
    --grid-line-main: rgba(58, 134, 200, 0.15);
    --notebook-margin-line: rgba(224, 86, 86, 0.4);
    
    --color-blue-ink: #3A86C8;
    --color-red-ink: #D04848;
    --color-dark-ink: #1E252B;
    
    --card-bg: #FFFFFF;
    --card-border: #1E252B;
    --card-shadow: 6px 6px 0px #1E252B;
    --card-shadow-hover: 10px 10px 0px #1E252B;

    /* Plane Geometry Colors */
    --color-head-bg: rgba(208, 72, 72, 0.1);
    --color-body-bg: rgba(58, 134, 200, 0.08);
    
    /* Interactive States */
    --btn-hover-bg: #FCFAF2;
    --accent-glow: rgba(58, 134, 200, 0.25);
    
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* Dark Theme (Blueprint / Chalkboard) */
    --bg-color: #0E1317;
    --text-primary: #E8ECEF;
    --text-secondary: #9BAEBD;
    --grid-color: rgba(0, 242, 254, 0.05);
    --grid-line-main: rgba(0, 242, 254, 0.1);
    --notebook-margin-line: rgba(255, 91, 137, 0.15);
    
    --color-blue-ink: #00F2FE;
    --color-red-ink: #FF5B89;
    --color-dark-ink: #E8ECEF;
    
    --card-bg: #151C22;
    --card-border: #00F2FE;
    --card-shadow: 6px 6px 0px #00F2FE;
    --card-shadow-hover: 10px 10px 0px #00F2FE;
    
    --color-head-bg: rgba(255, 91, 137, 0.15);
    --color-body-bg: rgba(0, 242, 254, 0.1);
    
    --btn-hover-bg: #1D262F;
    --accent-glow: rgba(0, 242, 254, 0.3);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Background Paper Grid Overlay */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: -1;
    pointer-events: none;
}

/* Notebook Left Margin Line (Light Mode only) */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 10%;
    width: 2px;
    height: 100vh;
    background-color: var(--notebook-margin-line);
    z-index: -1;
    pointer-events: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.font-handwritten {
    font-family: var(--font-accent);
    font-size: 1.4rem;
    font-weight: 700;
}

.text-accent {
    color: var(--color-blue-ink);
}

a {
    color: inherit;
    text-decoration: none;
}

/* ==========================================================================
   Header Component
   ========================================================================== */
.header {
    width: 100%;
    border-bottom: 2px solid var(--text-primary);
    background-color: rgba(250, 248, 242, 0.8);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

[data-theme="dark"] .header {
    background-color: rgba(14, 19, 23, 0.8);
    border-color: var(--card-border);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    border: 2px solid var(--text-primary);
    transition: transform 0.5s ease;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

[data-theme="dark"] .logo-img {
    border-color: var(--card-border);
}

.logo-area:hover .logo-img {
    transform: rotate(15deg) scale(1.1);
}

.logo-text {
    font-size: 1.8rem;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
    padding: 0.25rem 0;
    color: var(--text-primary);
    transition: color 0.2s;
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-blue-ink);
    transition: width var(--transition-speed) ease;
}

.nav-link:hover::after {
    width: 100%;
}

.btn-secondary {
    border: 2px solid var(--text-primary);
    padding: 0.5rem 1.25rem;
    font-weight: 700;
    border-radius: 4px;
    box-shadow: 3px 3px 0 var(--text-primary);
    background-color: var(--bg-color);
    transition: all 0.2s ease;
}

[data-theme="dark"] .btn-secondary {
    border-color: var(--card-border);
    box-shadow: 3px 3px 0 var(--card-border);
}

.btn-secondary:hover {
    transform: translate(-2px, -2px);
    box-shadow: 5px 5px 0 var(--text-primary);
}

[data-theme="dark"] .btn-secondary:hover {
    box-shadow: 5px 5px 0 var(--card-border);
}

.theme-toggle-btn {
    background: none;
    border: 2px solid var(--text-primary);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    transition: all 0.2s ease;
}

[data-theme="dark"] .theme-toggle-btn {
    border-color: var(--card-border);
    color: var(--card-border);
}

.theme-toggle-btn:hover {
    background-color: var(--btn-hover-bg);
    transform: rotate(30deg);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
}

/* Toggle displays for sun/moon */
.sun-icon { display: block; }
.moon-icon { display: none; }

[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding: 5rem 0;
    border-bottom: 2px solid var(--grid-line-main);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    border: 2px dashed var(--color-blue-ink);
    color: var(--color-blue-ink);
    border-radius: 30px;
    margin-bottom: 1.5rem;
    transform: rotate(-1.5deg);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    letter-spacing: -1.5px;
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 580px;
}

/* Download Buttons */
.download-badges {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-dark-ink);
    color: var(--bg-color);
    border-radius: 8px;
    font-weight: 600;
    border: 2px solid var(--text-primary);
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.15);
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

[data-theme="dark"] .download-btn {
    border-color: var(--card-border);
    box-shadow: 4px 4px 0 rgba(0, 242, 254, 0.1);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.2);
}

.btn-icon {
    width: 28px;
    height: 28px;
}

.btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.btn-subtext {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    opacity: 0.8;
}

.btn-maintext {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.2;
}

/* ==========================================================================
   Interactive Grid Card (Hero Right)
   ========================================================================== */
.hero-game-panel {
    display: flex;
    justify-content: center;
    perspective: 1000px;
}

.game-card {
    background-color: var(--card-bg);
    border: 3px solid var(--text-primary);
    border-radius: 12px;
    padding: 1.5rem;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), background-color var(--transition-speed), border-color var(--transition-speed);
}

[data-theme="dark"] .game-card {
    border-color: var(--card-border);
}

.game-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 2px dashed var(--grid-line-main);
    padding-bottom: 1rem;
    margin-bottom: 1.25rem;
}

.game-header-info h3 {
    font-size: 1.6rem;
    margin-bottom: 0.25rem;
}

.game-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.btn-reset {
    background: none;
    border: 2px solid var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s ease;
}

[data-theme="dark"] .btn-reset {
    border-color: var(--card-border);
    color: var(--text-primary);
}

.btn-reset:hover {
    background-color: var(--btn-hover-bg);
    transform: scale(1.05);
}

/* 10x10 Grid System */
.game-grid-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 1.25rem;
}

.grid-labels-x {
    display: flex;
    width: 100%;
    max-width: 320px;
    padding-left: 28px; /* Offset for Y label */
    margin-bottom: 4px;
    justify-content: space-between;
}

.grid-labels-x span {
    width: 30px;
    text-align: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.grid-row-container {
    display: flex;
    width: 100%;
    max-width: 348px;
}

.grid-labels-y {
    display: flex;
    flex-direction: column;
    height: 300px;
    width: 24px;
    justify-content: space-between;
    padding-right: 8px;
    align-items: flex-end;
}

.grid-labels-y span {
    height: 30px;
    display: flex;
    align-items: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    gap: 1px;
    background-color: var(--grid-line-main);
    border: 2px solid var(--text-primary);
    width: 300px;
    height: 300px;
    border-radius: 4px;
    overflow: hidden;
}

[data-theme="dark"] .game-grid {
    border-color: var(--card-border);
    background-color: var(--grid-line-main);
}

.grid-cell {
    background-color: var(--card-bg);
    cursor: pointer;
    position: relative;
    transition: background-color 0.15s ease;
}

.grid-cell:hover:not(.shot) {
    background-color: var(--color-body-bg);
}

/* Ink Blot Animation / Hit markers */
.grid-cell.shot::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60%;
    height: 60%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    animation: ink-bleed 0.4s cubic-bezier(0.19, 1, 0.22, 1) forwards;
}

/* Miss - Grey/dark empty circle outline */
.grid-cell.shot.miss::before {
    border: 2px solid var(--text-secondary);
    background: none;
    width: 40%;
    height: 40%;
}

/* Hit - Blue Ink Splat */
.grid-cell.shot.hit {
    background-color: var(--color-body-bg);
}

.grid-cell.shot.hit::before {
    background-color: var(--color-blue-ink);
    box-shadow: 0 0 4px var(--color-blue-ink);
}

/* Fatal Head Hit - Red Ink Splat */
.grid-cell.shot.fatal-hit {
    background-color: var(--color-head-bg);
}

.grid-cell.shot.fatal-hit::before {
    background-color: var(--color-red-ink);
    box-shadow: 0 0 8px var(--color-red-ink);
}

/* Reveal State for rest of plane body */
.grid-cell.revealed-body {
    background-color: var(--color-body-bg);
}

.grid-cell.revealed-body::after {
    content: "o";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-blue-ink);
    font-weight: bold;
    font-size: 0.75rem;
}

/* Feedback Status Bar */
.game-status-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    background-color: var(--grid-color);
    border: 1px dashed var(--text-secondary);
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--text-secondary);
}

.status-indicator.active {
    background-color: var(--color-blue-ink);
    box-shadow: 0 0 6px var(--color-blue-ink);
}

.status-indicator.victory {
    background-color: var(--color-red-ink);
    box-shadow: 0 0 6px var(--color-red-ink);
}

/* ==========================================================================
   How to Play Section
   ========================================================================== */
.how-to-play {
    padding: 6rem 0;
    background-color: rgba(58, 134, 200, 0.02);
    border-bottom: 2px solid var(--grid-line-main);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.rules-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.rule-card {
    background-color: var(--card-bg);
    border: 2px solid var(--text-primary);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 4px 4px 0 var(--text-primary);
    transition: all 0.2s ease, background-color var(--transition-speed);
}

[data-theme="dark"] .rule-card {
    border-color: var(--card-border);
    box-shadow: 4px 4px 0 var(--card-border);
}

.rule-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.25rem;
}

.rule-card.full-width {
    grid-column: span 2;
}

.plane-visualization {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.plane-svg {
    width: 200px;
    height: 200px;
    border: 2px solid var(--text-primary);
    border-radius: 6px;
    background-color: var(--card-bg);
}

[data-theme="dark"] .plane-svg {
    border-color: var(--card-border);
}

.legend {
    display: flex;
    gap: 2rem;
    font-size: 0.85rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot-red { background-color: var(--color-red-ink); }
.dot-blue { background-color: var(--color-blue-ink); }

.rule-list {
    list-style: none;
}

.rule-list li {
    margin-bottom: 1.25rem;
    position: relative;
    padding-left: 1.5rem;
}

.rule-list li::before {
    content: "✎";
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--color-blue-ink);
    font-weight: bold;
}

.modes-comparison {
    display: flex;
    gap: 2.5rem;
    align-items: stretch;
}

.mode-item {
    flex: 1;
}

.mode-item h4 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
    color: var(--color-blue-ink);
}

.rule-card .divider {
    width: 1px;
    background-color: var(--grid-line-main);
    align-self: stretch;
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.features {
    padding: 6rem 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    border: 2px solid var(--text-primary);
    border-radius: 8px;
    padding: 2.5rem 2rem;
    box-shadow: 4px 4px 0 var(--text-primary);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color var(--transition-speed);
}

[data-theme="dark"] .feature-card {
    border-color: var(--card-border);
    box-shadow: 4px 4px 0 var(--card-border);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 6px 6px 0 var(--text-primary);
}

[data-theme="dark"] .feature-card:hover {
    box-shadow: 6px 6px 0 var(--card-border);
}

.feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background-color: var(--color-body-bg);
    border: 2px solid var(--color-blue-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-blue-ink);
    margin-bottom: 1.5rem;
}

.feature-icon svg {
    width: 26px;
    height: 26px;
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==========================================================================
   Footer Component
   ========================================================================== */
.footer {
    border-top: 2px solid var(--text-primary);
    background-color: var(--card-bg);
    padding: 4rem 0 2rem 0;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

[data-theme="dark"] .footer {
    border-color: var(--card-border);
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--grid-line-main);
}

.footer-brand .logo-area {
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-secondary);
    max-width: 350px;
}

.footer-links h4 {
    font-size: 1.1rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.footer-links ul {
    list-style: none;
}

.footer-links ul li {
    margin-bottom: 0.75rem;
}

.footer-links ul li a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.2s;
}

.footer-links ul li a:hover {
    color: var(--color-blue-ink);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Keyframes & Animations
   ========================================================================== */
@keyframes ink-bleed {
    0% {
        width: 0%;
        height: 0%;
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.2);
    }
    50% {
        opacity: 0.95;
    }
    100% {
        width: 60%;
        height: 60%;
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Floating Logo animation */
@keyframes float {
    0% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-5px) rotate(1deg); }
    100% { transform: translateY(0px) rotate(0deg); }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .download-badges {
        justify-content: center;
    }
    
    .rules-grid {
        grid-template-columns: 1fr;
    }
    
    .rule-card.full-width {
        grid-column: auto;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    body::before {
        left: 5%; /* Shift notebook line further left */
    }
}

@media (max-width: 600px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .modes-comparison {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .rule-card .divider {
        width: 100%;
        height: 1px;
    }
}