/* ═══════════════════════════════════════════════
   py.css  —  Codepth Python Tutorial
   Theme: White · Green · Gray
   Font: Plus Jakarta Sans + JetBrains Mono
═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap');

/* ─── CSS Variables ───────────────────────────── */
:root {
    --green-500:   #22c55e;
    --green-600:   #16a34a;
    --green-700:   #15803d;
    --green-100:   #dcfce7;
    --green-50:    #f0fdf4;
    --gray-900:    #111827;
    --gray-700:    #374151;
    --gray-500:    #6b7280;
    --gray-400:    #9ca3af;
    --gray-200:    #e5e7eb;
    --gray-100:    #f3f4f6;
    --gray-50:     #f9fafb;
    --white:       #ffffff;
    --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
    --shadow-md:   0 4px 16px rgba(0,0,0,0.10);
    --shadow-lg:   0 12px 40px rgba(0,0,0,0.12);
    --radius:      10px;
    --font-main:   'Plus Jakarta Sans', sans-serif;
    --font-mono:   'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-main);
    background: var(--gray-50);
    color: var(--gray-700);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ═══════════════════════════════════════════════
   HEADER
═══════════════════════════════════════════════ */
header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.brand-logo img {
    display: block;
}

/* Search */
.search-wrap {
    display: flex;
    align-items: center;
    background: var(--gray-50);
    border: 1.5px solid var(--gray-200);
    border-radius: 50px;
    padding: 6px 6px 6px 14px;
    gap: 8px;
    transition: border-color 0.2s;
}
.search-wrap:focus-within {
    border-color: var(--green-500);
    box-shadow: 0 0 0 3px rgba(34,197,94,0.12);
}
.search-icon { font-size: 14px; color: var(--gray-400); }
.search-input {
    flex: 1;
    border: none;
    background: transparent;
    font-family: var(--font-main);
    font-size: 14px;
    color: var(--gray-700);
    outline: none;
}
.search-input::placeholder { color: var(--gray-400); }
.search-btn {
    background: var(--green-600);
    color: var(--white);
    border: none;
    padding: 7px 18px;
    border-radius: 50px;
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.search-btn:hover { background: var(--green-700); }

/* ═══════════════════════════════════════════════
   TOP NAVBAR
═══════════════════════════════════════════════ */
.top-navbar {
    background: var(--gray-900);
    position: sticky;
    top: 61px;
    z-index: 99;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 2px;
    padding: 0;
    margin: 0;
}

.nav-list .nav-link {
    display: block;
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 12px 16px;
    border-bottom: 3px solid transparent;
    transition: color 0.2s, border-color 0.2s;
    white-space: nowrap;
}

.nav-list .nav-link:hover {
    color: var(--white);
    border-bottom-color: rgba(34,197,94,0.5);
}

.nav-list .nav-link.active {
    color: var(--green-500);
    border-bottom-color: var(--green-500);
    font-weight: 700;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--white);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    font-family: var(--font-main);
}

/* ═══════════════════════════════════════════════
   PAGE LAYOUT
═══════════════════════════════════════════════ */
.page-wrapper {
    display: flex;
    flex: 1;
    min-height: 0;
}

/* ═══════════════════════════════════════════════
   SIDEBAR
═══════════════════════════════════════════════ */
.sidebar {
    width: 260px;
    min-width: 260px;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    overflow-y: auto;
    flex-shrink: 0;
    position: sticky;
    top: 109px;
    height: calc(100vh - 109px);
}

.sidebar-header {
    background: var(--gray-900);
    padding: 14px 18px;
    position: sticky;
    top: 0;
}

.sidebar-title {
    color: var(--white);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.sidebar-list {
    list-style: none;
    padding: 8px 0;
    margin: 0;
}

.sidebar-list li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 18px;
    text-decoration: none;
    color: var(--gray-700);
    font-size: 13.5px;
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.sidebar-list li a:hover {
    background: var(--green-50);
    color: var(--green-700);
    border-left-color: var(--green-500);
}

.sidebar-list li.active > a {
    background: var(--green-50);
    color: var(--green-700);
    border-left-color: var(--green-600);
    font-weight: 700;
}

.s-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    font-size: 12px;
    color: var(--gray-400);
    font-family: var(--font-mono);
    flex-shrink: 0;
}

.sidebar-list li.active > a .s-icon,
.sidebar-list li a:hover .s-icon {
    color: var(--green-600);
}

.sidebar-list li a .arrow {
    margin-left: auto;
    font-size: 10px;
    color: var(--gray-400);
}

/* ═══════════════════════════════════════════════
   MAIN CONTENT
═══════════════════════════════════════════════ */
.main-content {
    flex: 1;
    overflow-x: hidden;
}

/* ═══════════════════════════════════════════════
   WELCOME SECTION
═══════════════════════════════════════════════ */
.welcome-wrapper {
    position: relative;
    min-height: calc(100vh - 109px);
    background: var(--white);
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 60px 56px;
}

/* Subtle dot pattern */
.bg-dots {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle, #d1d5db 1px, transparent 1px);
    background-size: 28px 28px;
    opacity: 0.45;
    pointer-events: none;
}

/* Soft green accent blobs */
.bg-accent-circle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(70px);
}
.c1 {
    width: 480px; height: 480px;
    background: rgba(34,197,94,0.10);
    top: -160px; right: -160px;
}
.c2 {
    width: 320px; height: 320px;
    background: rgba(34,197,94,0.07);
    bottom: -100px; left: -80px;
}

/* Two-column inner layout */
.welcome-inner {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 64px;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    animation: fadeUp 0.7s cubic-bezier(0.16,1,0.3,1) both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(32px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ─── Left: Text ──────────────────────────────── */
.welcome-text {
    flex: 1;
    min-width: 0;
}

/* Badge */
.py-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--green-50);
    border: 1.5px solid var(--green-100);
    color: var(--green-700);
    font-size: 12.5px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 50px;
    margin-bottom: 28px;
    letter-spacing: 0.03em;
}
.badge-dot {
    width: 7px; height: 7px;
    background: var(--green-500);
    border-radius: 50%;
    display: inline-block;
    animation: pulse 2s ease infinite;
}
@keyframes pulse {
    0%,100% { opacity: 1; transform: scale(1); }
    50%      { opacity: 0.5; transform: scale(1.4); }
}

/* Title */
.welcome-title {
    font-size: clamp(2.2rem, 4vw, 3.4rem);
    font-weight: 800;
    line-height: 1.12;
    margin-bottom: 22px;
    letter-spacing: -0.03em;
}

.gray-text {
    color: var(--gray-500);
    -webkit-text-fill-color: var(--gray-500);
}
.green-text {
    color: var(--green-600);
    -webkit-text-fill-color: var(--green-600);
}

/* Subtitle */
.welcome-sub {
    font-size: 15.5px;
    color: var(--gray-500);
    line-height: 1.75;
    margin-bottom: 36px;
    max-width: 480px;
}

/* Stats pills */
.stats-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}
.stat-pill {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--gray-50);
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 10px 20px;
    min-width: 90px;
    transition: border-color 0.2s, background 0.2s;
}
.stat-pill:hover {
    border-color: var(--green-500);
    background: var(--green-50);
}
.stat-pill strong {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--green-600);
    font-family: var(--font-main);
}
.stat-pill span {
    font-size: 11px;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-top: 2px;
    white-space: nowrap;
}

/* CTA buttons */
.cta-row {
    display: flex;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
}

.start-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--green-600);
    color: var(--white);
    font-family: var(--font-main);
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    padding: 14px 28px;
    border-radius: var(--radius);
    box-shadow: 0 4px 18px rgba(22,163,74,0.30);
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.start-btn:hover {
    background: var(--green-700);
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(22,163,74,0.40);
    color: var(--white);
}
.start-btn:active { transform: translateY(0); }
.start-btn svg { transition: transform 0.2s; }
.start-btn:hover svg { transform: translateX(4px); }

.outline-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: var(--gray-700);
    font-family: var(--font-main);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    padding: 14px 24px;
    border-radius: var(--radius);
    border: 1.5px solid var(--gray-200);
    transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.outline-btn:hover {
    border-color: var(--green-500);
    background: var(--green-50);
    color: var(--green-700);
}

/* ─── Right: Code Card ────────────────────────── */
.code-card {
    flex: 0 0 420px;
    background: var(--gray-900);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.06);
}

.code-card-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    background: #1e2230;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.dot {
    width: 11px; height: 11px;
    border-radius: 50%;
}
.dot.red    { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green  { background: #28c840; }

.code-filename {
    margin-left: 10px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: rgba(255,255,255,0.4);
}

.code-block {
    padding: 24px 22px;
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.8;
    margin: 0;
    color: #e2e8f0;
    overflow-x: auto;
    white-space: pre;
    background: var(--gray-900);
}

/* Syntax colors */
.c-comment { color: #64748b; font-style: italic; }
.c-kw      { color: #4ade80; font-weight: 600; }
.c-str     { color: #fbbf24; }
.c-num     { color: #60a5fa; }
.c-var     { color: #e2e8f0; }

.code-card-footer {
    background: #1e2230;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.run-tag {
    background: var(--green-600);
    color: var(--white);
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    font-family: var(--font-mono);
    white-space: nowrap;
}
.output-text {
    font-family: var(--font-mono);
    font-size: 12px;
    color: rgba(255,255,255,0.45);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ═══════════════════════════════════════════════
   CONTENT PAGE STYLES (for inner pages)
═══════════════════════════════════════════════ */
.content-page {
    padding: 40px 52px 60px;
    max-width: 900px;
}

.content-page h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.content-page .page-subtitle {
    color: var(--gray-400);
    font-size: 14px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--gray-200);
}

/* Nav buttons */
.nav-btn-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 32px;
}
.btn-nav {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--white);
    color: var(--gray-700);
    border: 1.5px solid var(--gray-200);
    padding: 9px 18px;
    font-size: 13.5px;
    font-weight: 600;
    font-family: var(--font-main);
    border-radius: var(--radius);
    text-decoration: none;
    transition: border-color 0.2s, background 0.2s, color 0.2s;
}
.btn-nav:hover {
    border-color: var(--green-500);
    background: var(--green-50);
    color: var(--green-700);
}

/* Intro box */
.intro-box {
    background: var(--green-50);
    border: 1.5px solid var(--green-100);
    border-left: 4px solid var(--green-500);
    border-radius: var(--radius);
    padding: 28px 32px;
    margin-bottom: 28px;
}
.intro-box h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}
.intro-box p {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 1.7;
    margin-bottom: 6px;
}
.btn-start {
    display: inline-flex;
    align-items: center;
    background: var(--green-600);
    color: var(--white);
    padding: 10px 22px;
    font-size: 14.5px;
    font-weight: 700;
    font-family: var(--font-main);
    border-radius: var(--radius);
    text-decoration: none;
    margin-top: 14px;
    transition: background 0.2s;
}
.btn-start:hover { background: var(--green-700); color: var(--white); }

/* Progress bar */
.progress-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.prog-bar-wrap {
    flex: 1;
    height: 8px;
    background: var(--gray-200);
    border-radius: 10px;
    overflow: hidden;
}
.prog-bar-fill {
    width: 4%;
    height: 100%;
    background: linear-gradient(90deg, var(--green-500), var(--green-600));
    border-radius: 10px;
}
.tip-text {
    font-size: 13.5px;
    color: var(--gray-500);
    margin-bottom: 32px;
}
.tip-text a { color: var(--green-600); text-decoration: none; font-weight: 600; }
.tip-text a:hover { text-decoration: underline; }

/* Example boxes */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.example-box {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
}
.example-box-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 10px 18px;
    font-size: 13px;
    font-weight: 700;
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: 8px;
}
.example-box-header::before {
    content: '💡';
    font-size: 14px;
}
.example-box pre {
    background: #1e2230;
    padding: 18px 20px;
    font-family: var(--font-mono);
    font-size: 13.5px;
    color: #e2e8f0;
    margin: 0;
    overflow-x: auto;
    line-height: 1.7;
}
.example-box-footer {
    padding: 12px 18px;
    background: var(--white);
}
.btn-try {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--green-600);
    color: var(--white);
    border: none;
    padding: 7px 16px;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-main);
    border-radius: 6px;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-try:hover { background: var(--green-700); color: var(--white); }

/* Bookmark */
.bookmark-icon {
    position: absolute;
    top: 28px;
    right: 28px;
    font-size: 20px;
    color: var(--green-500);
    cursor: pointer;
    transition: transform 0.2s;
}
.bookmark-icon:hover { transform: scale(1.2); }

/* ═══════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════ */
footer {
    background: var(--gray-900);
    padding: 18px 32px;
    margin-top: auto;
}
.footer-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: space-between;
}
.footer-logo {
    color: var(--green-400, #4ade80);
    font-weight: 700;
    font-size: 15px;
}
.footer-copy {
    color: rgba(255,255,255,0.35);
    font-size: 13px;
}
.footer-links {
    display: flex;
    gap: 18px;
}
.footer-links a {
    color: rgba(255,255,255,0.45);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--green-500); }

/* ═══════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════ */
@media (max-width: 900px) {
    .welcome-inner {
        flex-direction: column;
        gap: 40px;
    }
    .code-card {
        flex: none;
        width: 100%;
        max-width: 480px;
    }
    .welcome-wrapper { padding: 48px 32px; }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -270px;
        top: 0;
        height: 100vh;
        z-index: 200;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }
    .sidebar.open { left: 0; }
    .mobile-menu-btn { display: block; }
    .welcome-wrapper { padding: 36px 20px; min-height: auto; }
    .content-page { padding: 28px 20px 48px; }
}

@media (max-width: 480px) {
    .nav-list { display: none; }
    .stats-row { gap: 8px; }
    .cta-row { flex-direction: column; align-items: flex-start; }
    .start-btn, .outline-btn { width: 100%; justify-content: center; }
}


/* SIDEBAR */
.sidebar {
    width: 250px;
    min-width: 250px;
    border-right: 1px solid #e0e0e0;
    background: #fff;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-title {
    background-color: #282A35;
    color: #fff;
    padding: 12px 16px;
    font-size: 15.5px;
    font-weight: bold;
    margin: 0;
    display: block;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar ul li a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 9px 16px;
    text-decoration: none;
    color: #333;
    font-size: 14px;
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.15s;
}

.sidebar ul li a:hover {
    background-color: #f1f1f1;
}

.sidebar ul li.active>a {
    background-color: #04AA6D;
    color: #fff;
    font-weight: 600;
}

.sidebar ul li a .arrow {
    color: #aaa;
    font-size: 11px;
}

.sidebar ul li.active>a .arrow {
    color: rgba(255, 255, 255, 0.7);
}