/* =========================================================
   AOSEN INTERNATIONAL LIMITED - Common / Base Styles
   Shared across all pages (EN & ZH)
   ========================================================= */

/* ============ Global Variables and Reset ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --c-bg-light: #E8F4F8;
    --c-mid: #B3D9E8;
    --c-accent: #7BC0D6;
    --c-brand: #4A90A2;
    --c-dark: #2C5F7A;
    --c-white: #ffffff;
    --shadow: 0 4px 12px rgba(44, 95, 122, 0.12);
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--c-dark);
    background-color: var(--c-white);
    line-height: 1.6;
}
a {
    color: var(--c-brand);
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover {
    color: var(--c-dark);
}
img {
    max-width: 100%;
    display: block;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============ Buttons ============ */
.btn {
    display: inline-block;
    background: var(--c-brand);
    color: var(--c-white);
    padding: 12px 30px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    cursor: pointer;
}
.btn:hover {
    background: var(--c-dark);
    color: var(--c-white);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(44, 95, 122, 0.3);
}
.center-btn { text-align: center; }

/* ============ Common Section ============ */
.section {
    padding: 70px 0;
}
.section-title {
    text-align: center;
    font-size: 32px;
    color: var(--c-dark);
    margin-bottom: 12px;
    font-weight: 800;
}
.section-sub {
    text-align: center;
    color: var(--c-brand);
    font-size: 16px;
    margin-bottom: 40px;
}

/* ============ Page Banner (About / Contact) ============ */
.page-banner {
    margin-top: 68px;
    background: linear-gradient(135deg, var(--c-bg-light), var(--c-mid));
    padding: 70px 0;
    text-align: center;
}
.page-banner h1 {
    font-size: 40px;
    color: var(--c-dark);
    font-weight: 800;
    margin-bottom: 10px;
}
.page-banner p {
    color: var(--c-dark);
    opacity: 0.8;
    font-size: 17px;
}