@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=VT323&display=swap');

/* ── Variables ── */
:root {
    --green:     #00ff41;
    --green-dim: #008f11;
    --cyan:      #00d4ff;
    --red:       #ff0040;
    --yellow:    #ffd700;
    --purple:    #9b59b6;
    --orange:    #ff6b35;
    --bg:        #0a0a0a;
    --bg2:       #111111;
    --bg3:       #1a1a1a;
    --border:    rgba(0,255,65,0.2);
    --text:      #c8ffbe;
    --text-dim:  #6b8f6b;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Share Tech Mono', monospace;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ── Matrix Rain Canvas ── */
#matrix-rain {
    position: fixed;
    inset: 0;
    z-index: -2;
    opacity: 0.08;
    pointer-events: none;
}

/* ── Scanlines ── */
.scanlines {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.15) 2px,
        rgba(0,0,0,0.15) 4px
    );
}

/* ── Hidden utility ── */
.hidden { display: none !important; }

/* ── Boot Screen ── */
.boot-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.boot-content { max-width: 700px; width: 100%; }

.boot-text {
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.9rem;
    color: var(--green);
    line-height: 1.8;
    text-shadow: 0 0 8px var(--green);
    white-space: pre-wrap;
}

/* ── Navbar ── */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10,10,10,0.95);
    border-bottom: 1px solid var(--border);
    padding: 14px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 500;
    backdrop-filter: blur(12px);
}

.nav-brand .brand-text {
    font-family: 'VT323', monospace;
    font-size: 1.8rem;
    color: var(--green);
    text-shadow: 0 0 20px var(--green);
    letter-spacing: 4px;
}

.nav-links { display: flex; gap: 24px; }

.nav-link {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 2px;
    transition: color 0.3s, text-shadow 0.3s;
}

.nav-link:hover {
    color: var(--green);
    text-shadow: 0 0 10px var(--green);
}

.nav-score { display: flex; align-items: center; gap: 8px; }

.score-label { color: var(--text-dim); font-size: 0.85rem; }

.score-value {
    font-family: 'VT323', monospace;
    font-size: 1.6rem;
    color: var(--cyan);
    text-shadow: 0 0 15px var(--cyan);
}

/* ── Glitch Effect ── */
.glitch {
    position: relative;
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0; left: 0;
    width: 100%;
}

.glitch::before {
    color: var(--cyan);
    animation: glitch-a 4s infinite;
    clip-path: polygon(0 0, 100% 0, 100% 40%, 0 40%);
    transform: translate(-3px, 0);
    opacity: 0;
}

.glitch::after {
    color: var(--red);
    animation: glitch-b 4s infinite;
    clip-path: polygon(0 60%, 100% 60%, 100% 100%, 0 100%);
    transform: translate(3px, 0);
    opacity: 0;
}

@keyframes glitch-a {
    0%,89%,100% { opacity: 0; transform: translate(0); }
    90%          { opacity: 0.8; transform: translate(-4px, 1px); }
    92%          { opacity: 0; }
    94%          { opacity: 0.6; transform: translate(3px, -1px); }
    96%          { opacity: 0; }
}

@keyframes glitch-b {
    0%,89%,100% { opacity: 0; transform: translate(0); }
    91%          { opacity: 0.8; transform: translate(4px, -1px); }
    93%          { opacity: 0; }
    95%          { opacity: 0.6; transform: translate(-3px, 1px); }
    97%          { opacity: 0; }
}

/* ── Blink animations ── */
@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:0; } }

.blink { animation: blink 1s step-end infinite; }

.blink-cursor { animation: blink 0.8s step-end infinite; color: var(--green); }

/* ── Hero ── */
.hero {
    min-height: 100vh;
    padding: 100px 60px 60px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-tag {
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 3px;
    margin-bottom: 16px;
}

.hero-title {
    font-family: 'VT323', monospace;
    font-size: clamp(3rem, 6vw, 6rem);
    color: var(--green);
    text-shadow: 0 0 40px var(--green), 0 0 80px rgba(0,255,65,0.3);
    letter-spacing: 6px;
    line-height: 1;
    margin-bottom: 24px;
}

.hero-subtitle {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    margin-bottom: 40px;
    color: var(--text-dim);
}

.prompt { color: var(--green); }

.typing { color: var(--text); min-width: 2px; }

.cursor { color: var(--green); font-size: 1.2rem; }

.hero-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-box {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-left: 3px solid var(--green);
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.stat-box:hover {
    border-left-color: var(--cyan);
    box-shadow: 0 0 20px rgba(0,212,255,0.1);
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 2px;
}

.stat-value {
    font-family: 'VT323', monospace;
    font-size: 2rem;
    color: var(--green);
    text-shadow: 0 0 10px var(--green);
}

/* ── Terminal Widget ── */
.hero-terminal {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(0,255,65,0.08), 0 20px 60px rgba(0,0,0,0.5);
}

.terminal-header {
    background: var(--bg3);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.terminal-dots { display: flex; gap: 6px; }

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red    { background: #ff5f57; }
.dot.yellow { background: #fec02f; }
.dot.green  { background: #28c840; }

.terminal-title {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin: 0 auto;
}

.terminal-body {
    padding: 20px;
    min-height: 240px;
    font-size: 0.85rem;
    line-height: 2;
}

.t-line { display: flex; gap: 10px; align-items: center; }

.t-prompt { color: var(--green); }

.t-cmd { color: var(--text); }

.t-green { color: var(--green); }

.t-cyan  { color: var(--cyan); }

.t-yellow { color: var(--yellow); }

/* ── Section Layout ── */
.challenges-section,
.scoreboard-section {
    max-width: 1300px;
    margin: 0 auto;
    padding: 60px 40px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-title {
    font-family: 'VT323', monospace;
    font-size: 2.2rem;
    color: var(--green);
    letter-spacing: 4px;
}

.bracket { color: var(--text-dim); }

.overall-progress { display: flex; align-items: center; gap: 12px; }

.progress-bar-wrap {
    width: 200px;
    height: 8px;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green-dim), var(--green));
    box-shadow: 0 0 10px var(--green);
    transition: width 0.6s ease;
}

#progress-text {
    font-size: 0.75rem;
    color: var(--text-dim);
    letter-spacing: 2px;
}

/* ── Category Filters ── */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 8px 18px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.78rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover,
.filter-btn.active {
    border-color: var(--green);
    color: var(--green);
    text-shadow: 0 0 10px var(--green);
    box-shadow: 0 0 15px rgba(0,255,65,0.15);
}

/* ── Category Colors ── */
.cat-web      { --cat-color: var(--cyan); }
.cat-crypto   { --cat-color: var(--purple); }
.cat-password { --cat-color: var(--yellow); }
.cat-assembly { --cat-color: var(--orange); }
.cat-reversing{ --cat-color: var(--red); }

/* ── Challenge Grid ── */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 20px;
}

.challenge-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    padding: 24px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.challenge-card::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,255,65,0.04), transparent);
    transition: left 0.6s;
}

.challenge-card:hover::before { left: 100%; }

.challenge-card:hover {
    border-color: var(--cat-color, var(--green));
    box-shadow: 0 0 25px rgba(0,255,65,0.12);
    transform: translateY(-3px);
}

.challenge-card.solved {
    border-left: 3px solid var(--green);
}

.challenge-card.solved::after {
    content: '✓ SOLVED';
    position: absolute;
    top: 12px; right: 12px;
    font-size: 0.65rem;
    color: var(--green);
    letter-spacing: 2px;
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-cat {
    font-size: 0.65rem;
    letter-spacing: 2px;
    padding: 3px 10px;
    border: 1px solid currentColor;
    color: var(--cat-color, var(--green));
    text-transform: uppercase;
}

.card-pts {
    font-family: 'VT323', monospace;
    font-size: 1.4rem;
    color: var(--cat-color, var(--green));
    text-shadow: 0 0 10px currentColor;
}

.card-title {
    font-size: 1rem;
    color: var(--text);
    letter-spacing: 1px;
    line-height: 1.4;
}

.card-desc {
    font-size: 0.78rem;
    color: var(--text-dim);
    line-height: 1.6;
    flex: 1;
}

.card-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.card-diff {
    font-size: 0.7rem;
    letter-spacing: 2px;
}

.diff-easy   { color: var(--green); }
.diff-medium { color: var(--yellow); }
.diff-hard   { color: var(--red); }

.card-action {
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 1px;
}

/* ── Modal ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backdrop-filter: blur(4px);
}

.modal {
    background: var(--bg2);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 640px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 0 60px rgba(0,255,65,0.1);
    animation: modal-in 0.3s ease;
}

@keyframes modal-in {
    from { opacity: 0; transform: scale(0.95) translateY(-20px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
}

.modal-title-area { display: flex; flex-direction: column; gap: 8px; }

.cat-badge {
    display: inline-block;
    font-size: 0.65rem;
    letter-spacing: 2px;
    padding: 3px 10px;
    border: 1px solid currentColor;
    text-transform: uppercase;
}

.modal-header h2 {
    font-size: 1.3rem;
    color: var(--text);
    letter-spacing: 1px;
}

.modal-close {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-dim);
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
    flex-shrink: 0;
}

.modal-close:hover {
    border-color: var(--red);
    color: var(--red);
    box-shadow: 0 0 10px rgba(255,0,64,0.3);
}

.modal-body { padding: 24px; display: flex; flex-direction: column; gap: 20px; }

.modal-meta { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

.meta-badge {
    font-size: 0.7rem;
    letter-spacing: 2px;
    padding: 4px 12px;
    border: 1px solid currentColor;
}

.meta-pts {
    font-family: 'VT323', monospace;
    font-size: 1.4rem;
    color: var(--cyan);
    text-shadow: 0 0 10px var(--cyan);
}

.meta-status {
    font-size: 0.7rem;
    letter-spacing: 2px;
}

.status-solved { color: var(--green); }
.status-unsolved { color: var(--text-dim); }

.modal-desc {
    font-size: 0.88rem;
    line-height: 1.8;
    color: var(--text);
    padding: 16px;
    background: var(--bg);
    border-left: 3px solid var(--border);
}

/* ── Hints ── */
.hint-section { border: 1px solid var(--border); }

.hint-toggle {
    padding: 12px 16px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.8rem;
    color: var(--yellow);
    letter-spacing: 2px;
    cursor: pointer;
    list-style: none;
    transition: background 0.3s;
}

.hint-toggle:hover { background: rgba(255,215,0,0.05); }

.hint-body {
    padding: 16px;
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--text-dim);
    border-top: 1px solid var(--border);
}

/* ── Open Challenge Button ── */
.btn-open {
    display: block;
    text-align: center;
    padding: 14px;
    background: transparent;
    border: 1px solid var(--green);
    color: var(--green);
    text-decoration: none;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.9rem;
    letter-spacing: 3px;
    transition: all 0.3s;
}

.btn-open:hover {
    background: rgba(0,255,65,0.08);
    box-shadow: 0 0 20px rgba(0,255,65,0.2);
}

/* ── Flag Zone ── */
.flag-zone {
    border: 1px solid var(--border);
    padding: 20px;
    background: var(--bg);
}

.flag-zone-label {
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 3px;
    margin-bottom: 12px;
}

.flag-input-row { display: flex; gap: 8px; }

.flag-input {
    flex: 1;
    background: var(--bg2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 16px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s;
}

.flag-input:focus { border-color: var(--green); }

.btn-submit {
    background: var(--green-dim);
    border: 1px solid var(--green);
    color: var(--green);
    padding: 12px 24px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.85rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-submit:hover {
    background: var(--green);
    color: var(--bg);
    box-shadow: 0 0 20px rgba(0,255,65,0.4);
}

.flag-feedback {
    margin-top: 12px;
    font-size: 0.82rem;
    letter-spacing: 1px;
    min-height: 20px;
}

.feedback-correct { color: var(--green); text-shadow: 0 0 10px var(--green); }
.feedback-wrong   { color: var(--red); }
.feedback-already { color: var(--yellow); }

/* ── Scoreboard ── */
.scoreboard-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    overflow: hidden;
}

.sb-header,
.sb-row {
    display: grid;
    grid-template-columns: 60px 1fr 120px 120px 120px;
    padding: 14px 20px;
    gap: 10px;
    align-items: center;
    font-size: 0.82rem;
}

.sb-header {
    background: var(--bg3);
    border-bottom: 1px solid var(--border);
    color: var(--text-dim);
    letter-spacing: 2px;
    font-size: 0.72rem;
}

.sb-row {
    border-bottom: 1px solid rgba(0,255,65,0.05);
    transition: background 0.3s;
}

.sb-row:hover { background: rgba(0,255,65,0.03); }

.sb-row.you {
    border-left: 3px solid var(--green);
    background: rgba(0,255,65,0.03);
}

.sb-rank {
    font-family: 'VT323', monospace;
    font-size: 1.3rem;
    color: var(--text-dim);
}

.sb-row.you .sb-rank { color: var(--green); }

.you-badge {
    font-size: 0.6rem;
    color: var(--green);
    letter-spacing: 1px;
}

/* ── Toast ── */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--bg2);
    border: 1px solid var(--green);
    color: var(--green);
    padding: 14px 24px;
    font-size: 0.85rem;
    letter-spacing: 2px;
    z-index: 9999;
    box-shadow: 0 0 30px rgba(0,255,65,0.3);
    animation: toast-in 0.4s ease;
    max-width: 360px;
}

@keyframes toast-in {
    from { opacity:0; transform: translateY(20px); }
    to   { opacity:1; transform: translateY(0); }
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 30px 40px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 2px;
    flex-wrap: wrap;
    gap: 10px;
}

/* ── Auth Overlay ── */
.auth-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-box {
    width: 100%;
    max-width: 420px;
    background: var(--bg2);
    border: 1px solid var(--border);
    padding: 36px;
    box-shadow: 0 0 60px rgba(0,255,65,0.08);
}

.auth-logo {
    font-family: 'VT323', monospace;
    font-size: 2rem;
    color: var(--green);
    text-shadow: 0 0 20px var(--green);
    letter-spacing: 5px;
    text-align: center;
    margin-bottom: 6px;
}

.auth-subtitle {
    text-align: center;
    font-size: 0.72rem;
    color: var(--dim);
    letter-spacing: 2px;
    margin-bottom: 24px;
}

.auth-tabs {
    display: flex;
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.auth-tab {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--dim);
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.8rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s;
}

.auth-tab.active {
    background: rgba(0,255,65,0.08);
    color: var(--green);
    border-bottom: 2px solid var(--green);
}

.auth-field {
    margin-bottom: 16px;
}

.auth-field label {
    display: block;
    font-size: 0.7rem;
    color: var(--dim);
    letter-spacing: 2px;
    margin-bottom: 6px;
}

.auth-field input {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 12px 14px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s;
}

.auth-field input:focus { border-color: var(--green); }

.auth-submit {
    width: 100%;
    margin-top: 8px;
    padding: 13px;
}

.auth-error {
    margin-top: 14px;
    font-size: 0.8rem;
    color: var(--red);
    text-align: center;
    min-height: 20px;
    letter-spacing: 1px;
}

/* ── Navbar user area ── */
.nav-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-username {
    font-size: 0.8rem;
    color: var(--green);
    letter-spacing: 2px;
}

.nav-logout {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--dim);
    padding: 5px 12px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s;
}

.nav-logout:hover {
    border-color: var(--red);
    color: var(--red);
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        padding: 90px 30px 40px;
    }

    .hero-terminal { display: none; }

    .challenges-section,
    .scoreboard-section { padding: 40px 20px; }

    .sb-header,
    .sb-row {
        grid-template-columns: 50px 1fr 80px 80px;
    }

    .sb-header span:last-child,
    .sb-row span:last-child { display: none; }

    .navbar { padding: 14px 20px; }

    .nav-links { display: none; }
}

@media (max-width: 600px) {
    .hero-stats { grid-template-columns: 1fr 1fr; }
    .navbar { gap: 10px; }
}