/* ==========================================
   CSS RESET & BASE
   ========================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Core palette — dark teal like Kaspersky CTF */
    --bg-primary: #0a1628;
    --bg-secondary: #0d1b2e;
    --bg-card: #122a3a;
    --bg-card-hover: #163a4e;
    --bg-card-active: #1a4560;
    --surface: #0f2030;

    /* Accents */
    --accent-teal: #00c9a7;
    --accent-teal-dim: #00a88a;
    --accent-cyan: #00e5ff;
    --accent-green: #00ffaa;
    --accent-red: #ff4466;
    --accent-yellow: #ffc107;

    /* Text */
    --text-primary: #e4eaf0;
    --text-secondary: #7d94a8;
    --text-muted: #4a6275;

    /* Borders */
    --border: rgba(0, 201, 167, 0.1);
    --border-hover: rgba(0, 201, 167, 0.3);
    --border-card: rgba(0, 201, 167, 0.12);

    /* Glow */
    --glow-teal: 0 0 20px rgba(0, 201, 167, 0.2);

    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --container-max: 1100px;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

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

ul {
    list-style: none;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================
   NAVBAR
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 3px;
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.logo-bracket {
    color: var(--accent-teal);
    font-weight: 400;
}

.logo-text {
    color: var(--text-primary);
}

.logo-accent {
    color: var(--accent-teal);
}

.logo-ctf {
    font-size: 0.65rem;
    color: var(--bg-primary);
    background: var(--accent-teal);
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 8px;
    font-weight: 800;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-link-active {
    color: var(--accent-teal) !important;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================
   PAGE HEADER
   ========================================== */
.page-header {
    position: relative;
    padding: 120px 0 48px;
    overflow: hidden;
    text-align: center;
}

.header-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 201, 167, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 201, 167, 0.025) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse 60% 80% at 50% 30%, black, transparent);
}

.header-glow {
    position: absolute;
    width: 500px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.08), transparent 70%);
    top: -100px;
    right: 10%;
    pointer-events: none;
    animation: headerFloat 10s ease-in-out infinite;
}

@keyframes headerFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-20px, 20px) scale(1.05); }
}

.header-content {
    position: relative;
    z-index: 2;
}

.header-partners {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 24px;
}

.partner-badge-mini {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.pbm-bracket {
    color: var(--accent-teal);
}

.partner-sep {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.partner-aic {
    color: var(--accent-cyan);
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.title-bracket {
    color: var(--accent-teal);
    font-weight: 400;
}

.header-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.hstat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hstat-value {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-teal);
}

.hstat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 2px;
}

.hstat-sep {
    width: 1px;
    height: 32px;
    background: var(--border);
}

/* ==========================================
   CHALLENGES BOARD
   ========================================== */
.challenges-board {
    padding: 32px 0 120px;
}

.challenge-category {
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.challenge-category.animate-in {
    opacity: 1;
    transform: translateY(0);
}

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

.category-icon {
    font-size: 1.3rem;
}

.category-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.category-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: auto;
    letter-spacing: 1px;
}

.challenges-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

/* ==========================================
   CHALLENGE CARDS
   ========================================== */
.challenge-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 160px;
    max-width: 200px;
    padding: 22px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
    font-family: inherit;
    color: inherit;
    text-align: center;
}

.challenge-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 201, 167, 0.05), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.challenge-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4), var(--glow-teal);
}

.challenge-card:hover::before {
    opacity: 1;
}

.challenge-card:active {
    transform: translateY(-2px);
    background: var(--bg-card-active);
}

.challenge-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--accent-teal);
    margin-bottom: 6px;
    position: relative;
    z-index: 1;
    line-height: 1.3;
}

.challenge-points {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* ==========================================
   MODAL
   ========================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(4, 10, 20, 0.85);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-hover);
    border-radius: 20px;
    width: 100%;
    max-width: 580px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    padding: 36px;
    transform: translateY(20px) scale(0.96);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5), 0 0 60px rgba(0, 201, 167, 0.05);
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

/* Scrollbar */
.modal::-webkit-scrollbar {
    width: 6px;
}

.modal::-webkit-scrollbar-track {
    background: transparent;
}

.modal::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 10px;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.modal-close:hover {
    background: rgba(255, 68, 102, 0.1);
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.modal-header {
    margin-bottom: 24px;
}

.modal-category {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    display: block;
    margin-bottom: 8px;
}

.modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.modal-points {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-teal);
    background: rgba(0, 201, 167, 0.1);
    border: 1px solid rgba(0, 201, 167, 0.2);
    padding: 4px 14px;
    border-radius: 20px;
}

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

.modal-description {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.modal-section {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
}

.modal-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-teal);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 14px;
}

.modal-hint {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
    font-style: italic;
    padding-left: 12px;
    border-left: 2px solid rgba(0, 201, 167, 0.3);
}

/* SSH Info */
.ssh-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ssh-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ssh-label {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    min-width: 40px;
}

.ssh-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.3);
    padding: 4px 12px;
    border-radius: 6px;
    border: 1px solid var(--border);
    flex: 1;
}

.copy-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 8px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s;
    color: var(--text-muted);
}

.copy-btn:hover {
    background: rgba(0, 201, 167, 0.1);
    border-color: var(--accent-teal);
}

.ssh-command {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.ssh-command code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-green);
    background: rgba(0, 0, 0, 0.3);
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    flex: 1;
}

/* File Download */
.file-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    background: rgba(0, 201, 167, 0.08);
    border: 1px solid rgba(0, 201, 167, 0.2);
    border-radius: 10px;
    color: var(--accent-teal);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

.file-download-btn:hover {
    background: rgba(0, 201, 167, 0.15);
    border-color: var(--accent-teal);
    transform: translateY(-2px);
    box-shadow: var(--glow-teal);
}

/* Flag Submission */
.flag-section {
    background: rgba(0, 201, 167, 0.03);
    border-color: rgba(0, 201, 167, 0.15);
}

.flag-input-group {
    display: flex;
    gap: 10px;
}

.flag-input {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.88rem;
    outline: none;
    transition: border-color 0.3s;
}

.flag-input::placeholder {
    color: var(--text-muted);
}

.flag-input:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px rgba(0, 201, 167, 0.1);
}

.flag-submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-teal-dim));
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.flag-submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 201, 167, 0.3);
}

.flag-submit-btn:active {
    transform: translateY(0);
}

.flag-feedback {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin-top: 10px;
    min-height: 20px;
    transition: all 0.3s;
}

.flag-feedback.error {
    color: var(--accent-red);
}

.flag-feedback.success {
    color: var(--accent-green);
}

/* ==========================================
   RULES SECTION
   ========================================== */
.rules-section {
    padding: 80px 0 100px;
    border-top: 1px solid var(--border);
    background: linear-gradient(180deg, var(--bg-primary), var(--bg-secondary));
}

.rules-header {
    text-align: center;
    margin-bottom: 48px;
}

.rules-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-teal);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.rules-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: 2px;
}

.rules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 36px;
}

.rules-card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 16px;
    padding: 28px 24px;
    transition: all 0.3s;
}

.rules-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.rules-discord {
    border-color: rgba(88, 101, 242, 0.25);
    background: linear-gradient(135deg, rgba(88, 101, 242, 0.06), transparent);
}

.rules-card-icon {
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.rules-card h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.rules-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.rules-card p:last-child {
    margin-bottom: 0;
}

.rules-link {
    color: #7289da;
    font-weight: 600;
    border-bottom: 1px dashed rgba(114, 137, 218, 0.4);
    transition: all 0.3s;
}

.rules-link:hover {
    color: #99aab5;
    border-color: #99aab5;
}

.rules-warning {
    font-size: 0.82rem !important;
    color: var(--accent-yellow) !important;
    background: rgba(255, 193, 7, 0.06);
    border: 1px solid rgba(255, 193, 7, 0.12);
    border-radius: 8px;
    padding: 10px 14px;
    margin-top: 4px;
}

.rules-list-container {
    max-width: 800px;
    margin: 0 auto;
}

.rules-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.rule-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
}

.rule-item:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.rule-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent-teal);
    background: rgba(0, 201, 167, 0.1);
    border: 1px solid rgba(0, 201, 167, 0.2);
    border-radius: 8px;
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.rule-content h4 {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 6px;
}

.rule-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.rule-content code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-green);
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* ==========================================
   COMING SOON
   ========================================== */
.coming-soon {
    padding: 60px 0 120px;
    min-height: 50vh;
    display: flex;
    align-items: center;
}

.cs-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cs-icon {
    font-size: 4rem;
    margin-bottom: 24px;
    animation: csPulse 2s ease-in-out infinite;
}

@keyframes csPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.cs-title {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.cs-accent {
    color: var(--accent-teal);
    text-shadow: 0 0 30px rgba(0, 201, 167, 0.3);
}

.cs-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.cs-countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
}

.cs-time-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 70px;
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: 12px;
    padding: 16px 12px;
}

.cs-time-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-teal);
    text-shadow: 0 0 20px rgba(0, 201, 167, 0.3);
    letter-spacing: 2px;
}

.cs-time-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 4px;
}

.cs-time-sep {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    animation: csBlink 1s step-end infinite;
}

@keyframes csBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.2; }
}

.cs-date {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.cs-date svg {
    color: var(--accent-teal);
}

.cs-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-teal);
    border: 1px solid rgba(0, 201, 167, 0.2);
    border-radius: 8px;
    padding: 12px 24px;
    transition: all 0.3s;
    letter-spacing: 1px;
}

.cs-btn:hover {
    background: rgba(0, 201, 167, 0.08);
    border-color: var(--accent-teal);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .cs-time-item {
        min-width: 55px;
        padding: 12px 8px;
    }
    .cs-time-value {
        font-size: 1.4rem;
    }
    .cs-countdown {
        gap: 6px;
    }
}

/* Admin Login on Coming Soon */
.cs-admin-login {
    margin-top: 36px;
}

.cs-admin-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s;
    letter-spacing: 1px;
}

.cs-admin-toggle:hover {
    color: var(--text-secondary);
    border-color: var(--border-hover);
}

.cs-login-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

.cs-login-input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.3s;
}

.cs-login-input::placeholder {
    color: var(--text-muted);
}

.cs-login-input:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px rgba(0, 201, 167, 0.1);
}

.cs-login-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-teal-dim));
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.cs-login-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 201, 167, 0.3);
}

.cs-login-error {
    display: none;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent-red);
}

/* ==========================================
   TOAST
   ==========================================*/
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-card);
    border: 1px solid var(--border-hover);
    border-radius: 10px;
    padding: 12px 24px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-teal);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: rgba(10, 22, 40, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        border-left: 1px solid var(--border);
    }

    .nav-links.active {
        right: 0;
    }

    .mobile-toggle {
        display: flex;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .header-stats {
        gap: 16px;
    }

    .hstat-value {
        font-size: 1.1rem;
    }

    .challenges-row {
        gap: 10px;
    }

    .challenge-card {
        min-width: 130px;
        max-width: none;
        flex: 1 1 calc(50% - 10px);
        padding: 18px 14px;
    }

    .modal {
        padding: 24px;
        max-height: 90vh;
        border-radius: 16px;
    }

    .modal-title {
        font-size: 1.2rem;
    }

    .flag-input-group {
        flex-direction: column;
    }

    .ssh-row {
        flex-wrap: wrap;
    }

    .rules-grid {
        grid-template-columns: 1fr;
    }

    .rule-item {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .challenge-card {
        flex: 1 1 100%;
    }

    .header-stats {
        flex-direction: column;
        gap: 12px;
    }

    .hstat-sep {
        width: 40px;
        height: 1px;
    }
}