*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--color-primary:#3DB54A;--color-primary-dark:#35a041;--color-primary-light:#E8F5E9;--color-bg:#F5F5F3;--color-text:#1A1A1A;--color-text-secondary:#6B6B6B;--color-white:#FFFFFF;--font-heading:'Poppins',sans-serif;--font-body:'Inter',sans-serif;--radius-card:16px;--radius-btn:12px;--shadow-card:0 4px 16px rgba(0,0,0,0.07);--shadow-btn:0 4px 20px rgba(61,181,74,0.35);--nav-height:68px}
html,body{height:100%;background:var(--color-bg);font-family:var(--font-body);color:var(--color-text);-webkit-font-smoothing:antialiased}
.app{max-width:430px;min-height:100%;margin:0 auto;background:var(--color-bg)}
.header{position:sticky;top:0;z-index:20;background:var(--color-white);border-bottom:1px solid rgba(0,0,0,0.06);padding:14px 20px}
.header-title{font-family:var(--font-heading);font-weight:800;font-size:20px}
.content{padding:16px 20px;padding-bottom:calc(var(--nav-height) + 32px);display:flex;flex-direction:column;gap:16px}

.static-back{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--color-primary);text-decoration:none;-webkit-tap-highlight-color:transparent;margin-top:-4px}
.static-back:active{opacity:0.65}

.static-article{background:var(--color-white);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:20px;display:flex;flex-direction:column;gap:14px}

.support-hero{display:flex;align-items:flex-start;gap:12px;padding:14px;border-radius:14px;background:linear-gradient(135deg,#F7FCF7 0%,#EEF8EF 100%);border:1px solid rgba(61,181,74,0.22)}
.support-hero-icon{width:38px;height:38px;border-radius:12px;background:var(--color-primary-light);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.support-hero-title{font-family:var(--font-heading);font-weight:800;font-size:17px;line-height:1.2;margin-bottom:4px}
.support-hero-desc{font-size:13px;line-height:1.5;color:var(--color-text-secondary)}

.support-section-title{font-family:var(--font-heading);font-weight:700;font-size:14px;color:var(--color-text)}
.support-steps{list-style:none;display:flex;flex-direction:column;gap:10px}
.support-step{display:flex;align-items:flex-start;gap:10px;background:#F8FAF8;border:1px solid rgba(0,0,0,0.06);border-radius:12px;padding:12px 12px}
.support-step-num{width:22px;height:22px;border-radius:50%;background:var(--color-primary);color:var(--color-white);font-family:var(--font-heading);font-weight:800;font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0;line-height:1}
.support-step-text{font-size:13px;line-height:1.5;color:var(--color-text-secondary)}

.support-tip{display:flex;align-items:flex-start;gap:8px;background:#FFF8E1;border-radius:12px;padding:12px 14px;font-size:12px;color:var(--color-text-secondary);line-height:1.45}
.support-tip .ui-icon{margin-top:1px;flex-shrink:0}

.demo-note{background:#FFF8E1;border-radius:12px;padding:14px 16px;font-size:12px;color:var(--color-text-secondary);line-height:1.45}
.demo-note strong{color:var(--color-text)}

.mail-btn{display:flex;align-items:center;justify-content:center;gap:8px;min-height:48px;border:none;border-radius:var(--radius-btn);background:var(--color-primary);color:var(--color-white);font-family:var(--font-heading);font-weight:700;font-size:14px;line-height:1.3;text-decoration:none;box-shadow:var(--shadow-btn);-webkit-tap-highlight-color:transparent;margin-top:2px;padding:10px 14px;text-align:center}
.mail-btn:active{transform:scale(0.97);background:var(--color-primary-dark)}
.mail-hint{font-size:12px;color:var(--color-text-secondary);text-align:center}

.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:430px;height:var(--nav-height);background:var(--color-white);border-top:1px solid rgba(0,0,0,0.06);display:flex;align-items:center;z-index:30;padding-bottom:env(safe-area-inset-bottom,0)}
.nav-tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;cursor:pointer;text-decoration:none;-webkit-tap-highlight-color:transparent;position:relative}
.nav-icon{display:flex;align-items:center;justify-content:center;line-height:1;opacity:0.35;transition:all 0.2s ease}
.nav-icon .ui-icon{width:18px;height:18px}
.nav-label{font-size:8px;font-weight:600;text-transform:uppercase;letter-spacing:0.35px;color:#9E9E9E;text-align:center;line-height:1.1;font-family:var(--font-body)}
.nav-tab.active .nav-icon{opacity:1}
.nav-tab.active .nav-label{color:var(--color-primary)}
.nav-tab.active::after{content:'';position:absolute;top:4px;width:4px;height:4px;border-radius:50%;background:var(--color-primary)}

@media(orientation:landscape)and(max-height:500px){.landscape-warning{display:flex!important}.app{display:none}}
.landscape-warning{display:none;position:fixed;inset:0;background:var(--color-bg);align-items:center;justify-content:center;flex-direction:column;gap:12px;z-index:999;padding:20px;color:var(--color-text-secondary)}
.landscape-warning .rotate-icon{display:flex;align-items:center;justify-content:center}
.landscape-warning .rotate-icon .ui-icon{width:48px;height:48px}

@media(max-width:374px){
  .support-hero-title{font-size:16px}
  .support-step-text{font-size:12px}
  .mail-btn{font-size:13px}
}