Style.css

/* Reset and base styles */
* {
box-sizing: border-box;
}

html, body {
height: 100%;
margin: 0;
padding: 0;
}

body {
min-height: 100vh;
display: flex;
flex-direction: column;
background: #f7f8fa;
font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
color: #222b45;
}

/* Unified Main Header */
.main-header {
width: 100%;
background: #fff;
border-bottom: 1px solid #e4e9f2;
box-shadow: 0 2px 8px rgba(52,120,246,0.05);
position: sticky;
top: 0;
z-index: 20;
}

.header-inner {
max-width: 700px;
margin: 0 auto;
display: flex;
align-items: center;
height: 62px;
justify-content: space-between;
padding: 0 0;
}

.header-left {
display: flex;
align-items: center;
gap: 32px;
}

.site-title-link {
display: flex;
align-items: center;
text-decoration: none;
color: #3478f6;
font-size: 1.35rem;
font-weight: 700;
letter-spacing: -1px;
margin-right: 18px;
}

.site-title {
font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
font-weight: 700;
font-size: 1.25rem;
color: #3478f6;
}

.main-nav {
display: flex;
align-items: center;
gap: 18px;
}

.nav-link {
color: #3d4253;
text-decoration: none;
font-size: 1.05rem;
font-weight: 500;
transition: color 0.18s;
display: flex;
align-items: center;
gap: 6px;
}

.nav-link:hover {
color: #3478f6;
}

.header-right {
display: flex;
align-items: center;
gap: 18px;
margin-right: 8px;
}

.icon {
width: 22px;
height: 22px;
opacity: 0.65;
cursor: pointer;
transition: opacity 0.18s;
display: flex;
align-items: center;
font-size: 1.2em;
}

.icon:hover {
opacity: 1;
}

/* Main Content Container */
.container {
max-width: 900px;
margin: 44px auto;
background: #fff;
border-radius: 14px;
box-shadow: 0 4px 24px 0 rgba(52,120,246,0.07), 0 1.5px 6px 0 rgba(60,72,88,0.04);
padding: 36px 36px 28px 36px;
border: 1px solid #f0f1f4;
}

h1 {
font-size: 2rem;
font-weight: 700;
text-align: center;
margin: 0 0 10px 0;
letter-spacing: -1px;
}

.subtitle {
text-align: center;
color: #8f9bb3;
font-size: 1.08rem;
margin-bottom: 28px;
}

.form-label {
font-size: 1rem;
font-weight: 500;
color: #8f9bb3;
margin-bottom: 4px;
display: block;
}

input[type="text"], textarea, select {
width: 100%;
padding: 12px 14px;
border: 1.5px solid #e4e9f2;
border-radius: 8px;
font-size: 1.07em;
background: #f7f8fa;
margin-bottom: 18px;
transition: border 0.18s;
color: #2d3551;
font-family: inherit;
}

input[type="text"]:focus, textarea:focus, select:focus {
border-color: #3478f6;
outline: none;
}

textarea {
min-height: 140px;
resize: vertical;
}

.form-row {
display: flex;
gap: 12px;
align-items: center;
margin-bottom: 12px;
}

.form-row select {
width: auto;
min-width: 120px;
margin-bottom: 0;
}

.form-row label {
margin-bottom: 0;
font-weight: 400;
}

.options-row {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 18px;
gap: 12px;
}

.options-row .option-group {
display: flex;
align-items: center;
gap: 8px;
}

.btn {
background: #3478f6;
color: #fff;
border: none;
border-radius: 8px;
padding: 12px 32px;
font-size: 1.1em;
font-weight: 600;
cursor: pointer;
transition: background 0.18s, box-shadow 0.18s;
box-shadow: 0 2px 8px rgba(52,120,246,0.08);
}

.btn:disabled {
background: #d2d8e6;
color: #fff;
cursor: not-allowed;
}

.btn:hover:enabled {
background: #255cc9;
}

::-webkit-scrollbar {
width: 8px;
background: #e4e9f2;
}
::-webkit-scrollbar-thumb {
background: #c5d6ee;
border-radius: 8px;
}

/* Footer */
.site-footer {
width: 100%;
background: #f7f8fa;
border-top: 1px solid #e4e9f2;
margin-top: 40px;
padding: 0;
font-size: 1.03em;
flex-shrink: 0;
}

.footer-inner {
max-width: 700px;
margin: 0 auto;
display: flex;
justify-content: space-between;
align-items: center;
padding: 18px 0 16px 0;
flex-wrap: wrap;
}

.footer-left {
color: #8f9bb3;
font-size: 1em;
font-weight: 400;
}

.footer-right {
display: flex;
gap: 18px;
flex-wrap: wrap;
}

.footer-link {
color: #3478f6;
text-decoration: none;
font-weight: 500;
transition: color 0.18s;
display: flex;
align-items: center;
font-size: 1em;
}

.footer-link:hover {
color: #255cc9;
}

/* Sticky footer support */
.page-content {
flex: 1 0 auto;
}

@media (max-width: 900px) {
.container {
max-width: 98vw;
padding: 18px 6vw 18px 6vw;
}
.header-inner, .footer-inner {
max-width: 98vw;
padding: 0 6vw;
}
.header-left {
gap: 12px;
}
.main-nav {
gap: 10px;
}
.header-right {
gap: 12px;
}
.footer-inner {
flex-direction: column;
align-items: flex-start;
gap: 10px;
padding: 18px 6vw 16px 6vw;
}
.footer-right {
gap: 14px;
}
}