/* Basic reset-ish */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
    color: #111827;
    background: #0f172a; /* dark slate body */
}

/* Layout helpers */
.cf-main {
    min-height: calc(100vh - 120px); /* leave space for header/footer */
}

/* HEADER */

.cf-header {
    background: #020617;
    border-bottom: 1px solid rgba(148, 163, 184, 0.25);
    color: #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 20;
}

.cf-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.cf-header-brand {
    display: flex;
    align-items: center;
}

.cf-header-logo-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: inherit;
}

.cf-header-logo {
    height: 36px;
    width: auto;
    border-radius: 6px;
}

.cf-header-title {
    font-size: 1.1rem;
    font-weight: 700;
}

/* NAVIGATION */

.cf-nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.cf-nav-link {
    color: #e5e7eb;
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
    transition: background 0.15s ease, color 0.15s ease;
}

.cf-nav-link:hover {
    background: rgba(148, 163, 184, 0.15);
    color: #f9fafb;
}

.cf-nav-dropdown-toggle {
    cursor: pointer;
    border: none;
    background: transparent;
    display: inline-flex;
    align-items: center;
    font: inherit;
    color: #e5e7eb;
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
}

.cf-nav-dropdown-toggle:hover {
    background: rgba(148, 163, 184, 0.15);
}

.cf-nav-caret {
    font-size: 0.75rem;
}

/* Simple hover-based dropdown (no JS, Paula-safe) */
.cf-nav-dropdown-menu {
    position: absolute;
    top: 110%;
    left: 0;
    min-width: 160px;
    background: #020617;
    border: 1px solid rgba(148, 163, 184, 0.4);
    border-radius: 8px;
    padding: 0.3rem 0;
    display: none;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.6);
}

.cf-nav-dropdown:hover .cf-nav-dropdown-menu {
    display: block;
}

.cf-nav-dropdown-item {
    display: block;
    padding: 0.45rem 0.9rem;
    color: #e5e7eb;
    text-decoration: none;
    font-size: 0.9rem;
}

.cf-nav-dropdown-item:hover {
    background: rgba(148, 163, 184, 0.2);
}

/* USER AREA */

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

.cf-user-greeting {
    font-size: 0.9rem;
    color: #cbd5f5;
}

/* BUTTONS */

.cf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.cf-btn-primary {
    background: #2563eb;
    color: #f9fafb;
    border-color: #2563eb;
}

.cf-btn-primary:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
}

.cf-btn-outline {
    background: transparent;
    color: #e5e7eb;
    border-color: #64748b;
}

.cf-btn-outline:hover {
    background: rgba(148, 163, 184, 0.15);
}

/* HERO */

.cf-hero {
    max-width: 1100px;
    margin: 2.5rem auto 1.5rem;
    padding: 2rem 1.5rem;
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    gap: 2.5rem;
    background: radial-gradient(circle at top left, #1d4ed8, #020617 55%);
    border-radius: 18px;
    color: #f9fafb;
    box-shadow: 0 25px 60px rgba(15, 23, 42, 0.7);
}

.cf-hero-text {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.cf-hero-title {
    font-size: 2.2rem;
    margin: 0;
}

.cf-hero-subtitle {
    margin: 0;
    font-size: 1rem;
    line-height: 1.5;
    color: #e5e7eb;
}

.cf-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 0.5rem;
}

.cf-hero-image-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
}

.cf-hero-image {
    max-width: 100%;
    height: auto;
    border-radius: 14px;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.9);
}

/* SECTIONS */

.cf-section {
    padding: 1.5rem 0 2.5rem;
}

.cf-section-light {
    background: #020617;
}

.cf-section-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.cf-section-title {
    margin: 0 0 0.75rem;
    font-size: 1.4rem;
    color: #d1d5db;
}

.cf-section-lead {
    margin: 0 0 1.8rem;
    font-size: 0.98rem;
    color: #cbd5f5;
    max-width: 50rem;
}

/* Feature cards */

.cf-feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.2rem;
}

.cf-feature-card {
    background: #0b1220;
    border-radius: 12px;
    padding: 1rem 1.1rem;
    border: 1px solid rgba(148, 163, 184, 0.35);
    color: #e5e7eb;
}

.cf-feature-card h3 {
    margin: 0 0 0.4rem;
    font-size: 1.05rem;
}

.cf-feature-card p {
    margin: 0;
    font-size: 0.9rem;
    color: #cbd5f5;
}

/* Quote card */

.cf-quote-card {
    max-width: 900px;
    background: #020617;
    border-radius: 12px;
    border: 1px solid rgba(148, 163, 184, 0.35);
    padding: 1.3rem 1.5rem;
}

.cf-quote-text {
    margin: 0.3rem 0 0.6rem;
    font-style: italic;
    color: #e5e7eb;
}

.cf-quote-caption {
    margin: 0;
    font-size: 0.85rem;
    color: #9ca3af;
}

/* FOOTER */

.cf-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.3);
    background: #020617;
    color: #9ca3af;
}

.cf-footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.7rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.cf-footer-text {
    margin: 0;
    font-size: 0.85rem;
}

.cf-footer-actions {
    display: flex;
    gap: 0.75rem;
}

.cf-footer-link {
    color: #cbd5f5;
    text-decoration: none;
    font-size: 0.85rem;
}

.cf-footer-link:hover {
    text-decoration: underline;
}

/* RESPONSIVE */

@media (max-width: 768px) {
    .cf-header-inner {
        flex-wrap: wrap;
        gap: 0.75rem 1rem;
    }

    .cf-nav {
        flex-wrap: wrap;
        justify-content: flex-start;
    }

    .cf-hero {
        grid-template-columns: 1fr;
        text-align: left;
    }

    .cf-hero-image-wrapper {
        order: -1;
    }
}

/* Utility grid tweak so it stacks nicely on mobile */
.cf-grid-stack {
    align-items: flex-start;
}

/* Lists used on About & Practice */
.cf-list {
    margin: 0.5rem 0 1rem 0;
    padding-left: 1.25rem;
}

.cf-list li + li {
    margin-top: 0.3rem;
}

.cf-list-tight li + li {
    margin-top: 0.15rem;
}

.cf-mb {
    margin-bottom: 2.5rem;
}

/* Monospace block for code-like textareas (Practice pad) */
.cf-mono-block {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
}

/* PROFILE CARD (me.jsp) */

.cf-profile-card {
    background: #020617;
    border-radius: 16px;
    border: 1px solid rgba(148, 163, 184, 0.4);
    padding: 1.6rem 1.8rem;
    max-width: 720px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.7);
}

.cf-profile-subtitle {
    margin: 0.25rem 0 1.4rem;
    font-size: 0.95rem;
    color: #cbd5f5;
}

.cf-profile-details {
    margin: 0 0 1.6rem;
}

.cf-profile-row {
    display: flex;
    gap: 1.5rem;
    padding: 0.4rem 0;
    border-bottom: 1px solid rgba(55, 65, 81, 0.6);
}

.cf-profile-row:last-child {
    border-bottom: none;
}

.cf-profile-row dt {
    min-width: 90px;
    font-weight: 600;
    color: #e5e7eb;
}

.cf-profile-row dd {
    margin: 0;
    color: #cbd5f5;
    word-break: break-all;
}

.cf-profile-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

/* Challenge list */

.cf-main { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 3rem; }
.cf-card { background: #fff; border-radius: 0.75rem; padding: 1.75rem 2rem; box-shadow: 0 18px 40px rgba(15,23,42,0.12); margin-bottom: 10px; }
cf-card-title { font-size: 1.5rem; margin: 0 0 0.5rem; color: #0b1220; }
.cf-page-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 1.5rem; gap: 1rem; }
.cf-page-title { font-size: 2rem; margin: 0; color: #d1d5db;}
.cf-page-subtitle { margin: .25rem 0 0; color: #6b7280; }
.cf-form-row { margin-bottom: 1rem; display: flex; flex-direction: column; gap: .35rem; }
.cf-form-row-inline { display: grid; grid-template-columns: repeat(auto-fit,minmax(180px,1fr)); gap: 1rem; }
.cf-form input, .cf-form select, .cf-form textarea { padding: .6rem .7rem; border-radius: .5rem; border: 1px solid #d1d5db; font: inherit; }
.cf-form-actions { display: flex; justify-content: flex-end; gap: .75rem; margin-top: 1.25rem; }
.cf-btn { border-radius: 999px; padding: .55rem 1.1rem; border: 1px solid transparent; font-weight: 500; cursor: pointer; text-decoration: none; }
.cf-btn-primary { background: #2563eb; color: #fff; }
.cf-btn-ghost { background: transparent; border-color: #d1d5db; color: #111827; }
.cf-table { width: 100%; border-collapse: collapse; }
.cf-table th, .cf-table td { padding: .6rem .75rem; border-bottom: 1px solid #e5e7eb; text-align: left; }
.cf-pill { display: inline-flex; align-items: center; padding: .15rem .55rem; border-radius: 999px; font-size: .75rem; font-weight: 500; color: #6b7280; }
.cf-pill-neutral { background: #e5e7eb; color: #111827; }
.cf-alert { padding: .7rem 1rem; border-radius: .5rem; margin-bottom: 1rem; }
.cf-alert-success { background: #ecfdf3; border: 1px solid #22c55e33; color: #15803d; }


/* 404 & 500 Error Pages */

.cf-error-card {
    text-align: center;
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
}

.cf-error-card-critical {
    border-top: 4px solid #ef4444;
}

.cf-error-code {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: #9ca3af;
    margin-bottom: 0.5rem;
}

.cf-error-actions {
    margin-top: 1.75rem;
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.cf-mono {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
    font-size: 0.9rem;
}

.cf-tiny {
    font-size: 0.75rem;
    margin-top: 1.5rem;
}