/* ============================================================
   STRATEGIC COMMAND — CYBERPUNK CSS SYSTEM
   RAHARJAA_.ADX // v3.0 (UPDATED)
   ============================================================ */

/* ---------- TOKENS ---------- */
:root {
    --primary:       #00ffd5;
    --secondary:     #7d5fff;
    --accent:        #ff6b6b;
    --bg:            #020205;
    --glass:         rgba(255, 255, 255, 0.03);
    --glass-border:  rgba(0, 255, 213, 0.2);
    --glossy:        linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0) 50%);
    --shadow-cyan:   0 0 20px rgba(0, 255, 213, 0.25);
    --shadow-purple: 0 0 20px rgba(125, 95, 255, 0.25);
    --radius-card:   22px;
    --radius-sm:     10px;
}

/* ---------- RESET ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    scroll-behavior: smooth;
    margin: 0;
    padding: 0;
}

/* ---------- BODY ---------- */
body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg);
    color: #fff;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    background-image:
        linear-gradient(rgba(2, 2, 5, 0.85), rgba(2, 2, 5, 0.85)),
        url('https://png.pngtree.com/background/20230519/pngtree-purple-pink-dark-cloud-night-sky-full-with-stars-galaxy-design-image_915937.png');
    background-size: cover;
    background-position: center;
}

/* ---------- HEADER ---------- */
header {
    padding: 10px 20px;
    text-align: center;
    background: rgba(5, 5, 18, 0.95);
    backdrop-filter: blur(25px);
    border-bottom: 1px solid var(--primary);
    box-shadow: var(--shadow-cyan);
    z-index: 100;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.3s;
}
header:hover { background: rgba(0, 255, 213, 0.05); }

.header-inner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
}

.header-badge {
    font-size: 0.6rem;
    letter-spacing: 3px;
    color: var(--secondary);
    border: 1px solid var(--secondary);
    padding: 3px 10px;
    border-radius: 20px;
    opacity: 0.8;
}

header h1 {
    font-family: 'Orbitron', sans-serif;
    color: var(--primary);
    font-size: 1.4rem;
    letter-spacing: 8px;
    text-shadow: 0 0 12px var(--primary);
}

.header-sub {
    font-size: 0.65rem;
    color: rgba(255,255,255,0.35);
    letter-spacing: 2px;
    font-family: 'Fira Code', monospace;
}

/* ---------- LAYOUT ---------- */
.layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ---------- SIDEBAR ---------- */
.sidebar {
    width: 260px;
    background: rgba(2, 2, 10, 0.9);
    border-right: 1px solid var(--glass-border);
    overflow-y: auto;
    padding: 12px 10px;
    flex-shrink: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }

.nav-group label {
    font-size: 0.6rem;
    color: var(--secondary);
    letter-spacing: 3px;
    display: block;
    margin: 18px 0 8px 8px;
    font-weight: 800;
    opacity: 0.8;
    text-transform: uppercase;
}

.sidebar button {
    background: var(--glass);
    border: 1px solid rgba(255, 255, 255, 0.04);
    color: #888;
    width: 100%;
    text-align: left;
    padding: 10px 14px;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.25s ease;
    font-size: 0.82rem;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Outfit', sans-serif;
}
.sidebar button:hover,
.sidebar button.active {
    background: rgba(0, 255, 213, 0.08);
    color: var(--primary);
    border-color: rgba(0, 255, 213, 0.4);
    box-shadow: 0 0 12px rgba(0, 255, 213, 0.1);
    transform: translateX(4px);
}
.sidebar button .btn-icon { font-size: 1rem; }

/* ---------- MAIN CONTENT ---------- */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 28px 24px;
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: var(--secondary) transparent;
}
.main-content::-webkit-scrollbar { width: 4px; }
.main-content::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 4px; }

main {
    max-width: 880px;
    margin: 0 auto;
}

/* ---------- CARD ---------- */
.card {
    background: var(--glass);
    border-radius: var(--radius-card);
    padding: 36px 40px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    position: relative;
    animation: fadeIn 0.4s ease;
    margin-bottom: 40px;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--glossy);
    border-radius: var(--radius-card);
    pointer-events: none;
}

/* ---------- SECTION TITLE ---------- */
.section-title {
    font-family: 'Orbitron', sans-serif;
    color: var(--primary);
    font-size: 0.75rem;
    margin: 24px 0 10px;
    letter-spacing: 3px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.section-title::before { content: '//'; opacity: 0.4; }

/* ---------- TEXT BOXES ---------- */
.theory-box {
    line-height: 1.75;
    color: #bbb;
    font-size: 0.92rem;
}
.theory-box strong { color: #fff; }

.example-box {
    background: rgba(125, 95, 255, 0.08);
    border-left: 3px solid var(--secondary);
    padding: 14px 16px;
    border-radius: 0 10px 10px 0;
    margin: 12px 0;
    font-family: 'Fira Code', monospace;
    font-size: 0.82rem;
    color: #ccc;
    line-height: 1.6;
}

/* NEW: PRACTICE BOX */
.practice-box {
    background: rgba(255, 107, 107, 0.08);
    border-left: 3px solid var(--accent);
    padding: 14px 16px;
    border-radius: 0 10px 10px 0;
    margin: 12px 0;
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem;
    color: #eaeaea;
    line-height: 1.6;
}
.practice-box span.solution {
    display: block;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px dashed rgba(255, 107, 107, 0.3);
    font-style: italic;
    color: #bbb;
}

/* ---------- FORMULA BOX ---------- */
.formula {
    background: rgba(0, 0, 0, 0.6);
    padding: 16px 20px;
    border-radius: 12px;
    color: var(--primary);
    font-family: 'Fira Code', monospace;
    text-align: center;
    border: 1px solid var(--secondary);
    font-size: 1.15rem;
    letter-spacing: 1px;
    box-shadow: inset 0 0 20px rgba(125,95,255,0.1);
}

/* ---------- MATH STICKER ---------- */
.math-sticker {
    font-family: 'Fira Code', monospace;
    color: var(--primary);
    border: 1px dashed rgba(0, 255, 213, 0.4);
    padding: 4px 14px;
    border-radius: 50px;
    display: inline-block;
    margin-bottom: 14px;
    background: rgba(0, 255, 213, 0.04);
    font-size: 0.8rem;
    letter-spacing: 1px;
}

/* ---------- HERO ---------- */
.hero-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.2rem;
    letter-spacing: -2px;
    line-height: 1.05;
    margin: 20px 0;
}
.hero-title span {
    color: var(--primary);
    text-shadow: 0 0 20px var(--primary);
}

.motivation {
    font-size: 1rem;
    color: #aaa;
    margin: 20px 0 36px;
    border-left: 3px solid var(--primary);
    padding-left: 18px;
    font-style: italic;
    line-height: 1.7;
}

.hero-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin: 30px 0;
}
.hero-stat {
    background: rgba(0,255,213,0.04);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 16px;
    text-align: center;
}
.hero-stat .stat-num {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    color: var(--primary);
    text-shadow: var(--shadow-cyan);
}
.hero-stat .stat-lbl {
    font-size: 0.75rem;
    color: #666;
    letter-spacing: 1px;
    margin-top: 4px;
}

/* ---------- VIDEO ---------- */
.video-wrapper {
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-purple);
}
.video-wrapper iframe {
    display: block;
    width: 100%;
    height: 340px;
    border: none;
}

/* ---------- CALCULATOR UI ---------- */
.calc-ui {
    background: rgba(0, 0, 0, 0.5);
    padding: 22px;
    border-radius: 16px;
    border: 1px solid rgba(0, 255, 213, 0.3);
    margin-top: 16px;
    box-shadow: inset 0 0 30px rgba(0,255,213,0.03);
}

.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 12px;
    margin-bottom: 14px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-group label {
    font-size: 0.7rem;
    color: var(--primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    opacity: 0.75;
}

input[type="number"],
input[type="text"] {
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid var(--glass-border);
    color: #fff;
    padding: 10px 12px;
    border-radius: 8px;
    width: 100%;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}
input[type="number"]:focus,
input[type="text"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px rgba(0,255,213,0.2);
}
input[type="number"].input-error {
    border-color: var(--accent);
    box-shadow: 0 0 8px rgba(255,107,107,0.3);
}

.btn-calc {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #000;
    padding: 13px 20px;
    border: none;
    border-radius: 10px;
    width: 100%;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
    overflow: hidden;
}
.btn-calc::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 60%);
}
.btn-calc:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,255,213,0.4);
}
.btn-calc:active { transform: translateY(0); }

/* ---------- RESULT DISPLAY ---------- */
.res-display {
    margin-top: 16px;
    font-family: 'Fira Code', monospace;
    background: rgba(0,0,0,0.6);
    border-radius: 10px;
    padding: 12px 16px;
    border: 1px solid var(--glass-border);
    min-height: 50px;
}

.res-answer {
    font-size: 1.2rem;
    color: var(--primary);
    text-shadow: 0 0 8px rgba(0,255,213,0.5);
    margin-bottom: 6px;
}

/* ---------- STEP BY STEP ---------- */
.step-wrapper {
    margin-top: 12px;
    border-top: 1px solid var(--glass-border);
    padding-top: 12px;
}

.step-title {
    font-size: 0.68rem;
    color: var(--secondary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.step-title::before { content: '>>'; opacity: 0.5; }

.step-item {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
    align-items: flex-start;
    animation: fadeIn 0.3s ease;
}

.step-num {
    background: rgba(125, 95, 255, 0.2);
    color: var(--secondary);
    border: 1px solid rgba(125,95,255,0.4);
    border-radius: 50%;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.step-text {
    font-size: 0.82rem;
    color: #ccc;
    line-height: 1.6;
}
.step-text .highlight {
    color: var(--primary);
    font-weight: 700;
}
.step-text .eq {
    color: #fff;
    font-style: italic;
}

/* ---------- ERROR MESSAGE ---------- */
.err-msg {
    color: var(--accent);
    font-size: 0.85rem;
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
    animation: fadeIn 0.3s ease;
}
.err-msg::before { content: '⚠'; }

/* ---------- UNIT DETAIL HEADER ---------- */
.unit-header {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    margin-bottom: 6px;
}
.unit-icon-big {
    font-size: 3rem;
    line-height: 1;
}
.unit-meta {
    flex: 1;
}
.unit-level-badge {
    font-size: 0.6rem;
    letter-spacing: 3px;
    color: var(--secondary);
    border: 1px solid rgba(125,95,255,0.4);
    padding: 2px 10px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 6px;
}

/* ---------- ANIMATIONS ---------- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-glow {
    0%, 100% { box-shadow: var(--shadow-cyan); }
    50%       { box-shadow: 0 0 35px rgba(0,255,213,0.5); }
}

/* ---------- SCROLLBAR GENERAL ---------- */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--secondary); border-radius: 5px; }