/* 7x24planning - Office Professional Aesthetic */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root { --bg: #F5F5F5; --bg-white: #FFFFFF; --text: #2C2C2C; --text-muted: #666666; --border: #DDDDDD; --accent: #3B5998; --accent-hover: #2d4373; }
body { font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }

/* NAVIGATION */
.nav { background: #2C2C2C; position: sticky; top: 0; z-index: 1000; }
.nav-inner { max-width: 960px; margin: 0 auto; display: flex; align-items: center; padding: 0 20px; }
.nav-logo { color: #FFFFFF; font-size: 18px; font-weight: bold; text-decoration: none; padding: 14px 0; margin-right: 30px; white-space: nowrap; display: block; }
.nav-logo:hover { color: #ccc; }
.nav-menu { display: flex; list-style: none; flex: 1; }
.nav-item { position: relative; }
.nav-link { display: block; color: #FFFFFF; text-decoration: none; padding: 14px 16px; font-size: 14px; transition: background 0.15s; cursor: pointer; }
.nav-link:hover { background: #444; }
.nav-dropdown { display: none; position: absolute; top: 100%; left: 0; background: #FFFFFF; border: 1px solid var(--border); border-top: none; box-shadow: 0 4px 12px rgba(0,0,0,0.1); min-width: 220px; z-index: 1001; }
.nav-item:hover .nav-dropdown { display: block; }
.nav-dropdown a { display: block; color: var(--text); text-decoration: none; padding: 9px 16px; font-size: 13px; border-bottom: 1px solid var(--border); }
.nav-dropdown a:last-child { border-bottom: none; }
.nav-dropdown a:hover { background: var(--bg); color: var(--accent); }

/* LAYOUT */
.container { max-width: 960px; margin: 0 auto; padding: 40px 20px; }
.page-header { margin-bottom: 32px; padding-bottom: 16px; border-bottom: 2px solid var(--border); }
.page-header h1 { font-size: 26px; font-weight: bold; color: var(--text); }
.page-header p { color: var(--text-muted); margin-top: 6px; font-size: 15px; }

/* TOOL LINKS */
.tool-section { margin-bottom: 40px; }
.tool-section h2 { font-size: 18px; font-weight: bold; color: var(--text); margin-bottom: 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.tool-list { list-style: none; }
.tool-list li { padding: 7px 0; border-bottom: 1px solid #eee; }
.tool-list li:last-child { border-bottom: none; }
.tool-list a { color: var(--accent); text-decoration: none; font-size: 15px; }
.tool-list a:hover { text-decoration: underline; color: var(--accent-hover); }

/* FORMS */
.form-group { margin-bottom: 16px; }
label { display: block; font-weight: bold; font-size: 13px; margin-bottom: 5px; color: var(--text); }
input[type="date"], input[type="number"], input[type="text"], select { width: 100%; max-width: 300px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 3px; font-size: 14px; font-family: inherit; background: var(--bg-white); }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,89,152,0.1); }
.btn { display: inline-block; padding: 9px 20px; background: var(--accent); color: #fff; border: none; border-radius: 3px; font-size: 14px; cursor: pointer; font-family: inherit; text-decoration: none; }
.btn:hover { background: var(--accent-hover); }
.btn + .btn { margin-left: 8px; }

/* RESULT */
.result-box { background: var(--bg-white); border: 1px solid var(--border); border-left: 4px solid var(--accent); padding: 16px 20px; margin: 20px 0; font-size: 16px; }
.result-box strong { font-size: 22px; color: var(--accent); }

/* FOOTER */
.footer { background: #2C2C2C; color: #AAAAAA; padding: 24px 20px; font-size: 13px; margin-top: 60px; }
.footer-inner { max-width: 960px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.footer a { color: #AAAAAA; text-decoration: none; }
.footer a:hover { color: #fff; }
.footer-links { display: flex; gap: 20px; }

/* E-E-A-T */
.eat-section { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-muted); }

/* UTILITIES */
.text-muted { color: var(--text-muted); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

/* TOOL LAYOUT */
.tool-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.tool-input-panel { background: var(--bg-white); border: 1px solid var(--border); padding: 24px; }
.tool-result-panel { background: var(--bg-white); border: 1px solid var(--border); padding: 24px; min-height: 200px; }

@media (max-width: 640px) {
    .tool-layout { grid-template-columns: 1fr; }
    .nav-inner { flex-wrap: wrap; }
    .nav-logo { font-size: 15px; margin-right: 10px; }
    .nav-link { padding: 10px 12px; font-size: 13px; }
}