@import url("https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;0,9..40,800;1,9..40,400&family=JetBrains+Mono:wght@400;500;600&display=swap");:root{--color-primary:#F5802F;--color-primary-hover:#E06B1A;--color-primary-soft:rgba(245,128,47,0.10);--color-primary-glow:rgba(245,128,47,0.25);--color-accent:#F7AF37;--color-bg:#F6F5F2;--color-surface:#FFFFFF;--color-surface-elevated:#FFFFFF;--color-sidebar:#1A1A1F;--color-sidebar-hover:rgba(255,255,255,0.06);--color-sidebar-active:rgba(245,128,47,0.12);--color-text:#1A1A1A;--color-text-secondary:#6B6B76;--color-text-tertiary:#A0A0AB;--color-text-inverse:#F0F0F0;--color-text-sidebar:rgba(255,255,255,0.55);--color-text-sidebar-active:#FFFFFF;--color-border:#EAEAE8;--color-divider:#E2E2DF;--color-success:#22C55E;--color-error:#EF4444;--color-warning:#F59E0B;--color-info:#3B82F6;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--radius-full:999px;--shadow-sm:0 1px 3px rgba(0,0,0,0.04),0 1px 2px rgba(0,0,0,0.02);--shadow-md:0 4px 16px rgba(0,0,0,0.06),0 1px 4px rgba(0,0,0,0.03);--shadow-lg:0 12px 40px rgba(0,0,0,0.08),0 2px 8px rgba(0,0,0,0.04);--shadow-glow:0 0 20px var(--color-primary-glow);--sidebar-width:260px;--ease-out:cubic-bezier(0.22,1,0.36,1);--ease-spring:cubic-bezier(0.34,1.56,0.64,1)}[data-theme=dark]{--color-primary:#F5802F;--color-primary-hover:#FF9142;--color-primary-soft:rgba(245,128,47,0.12);--color-primary-glow:rgba(245,128,47,0.30);--color-accent:#F7AF37;--color-bg:#0E0E11;--color-surface:#18181C;--color-surface-elevated:#1F1F24;--color-sidebar:#111114;--color-sidebar-hover:rgba(255,255,255,0.05);--color-sidebar-active:rgba(245,128,47,0.10);--color-text:#ECECF0;--color-text-secondary:#9494A0;--color-text-tertiary:#5C5C6A;--color-text-inverse:#F0F0F0;--color-text-sidebar:rgba(255,255,255,0.45);--color-text-sidebar-active:#FFFFFF;--color-border:#2A2A32;--color-divider:#242430;--color-success:#34D666;--color-error:#F87171;--color-warning:#FBBF24;--color-info:#60A5FA;--shadow-sm:0 1px 3px rgba(0,0,0,0.30),0 1px 2px rgba(0,0,0,0.20);--shadow-md:0 4px 16px rgba(0,0,0,0.40),0 1px 4px rgba(0,0,0,0.25);--shadow-lg:0 12px 40px rgba(0,0,0,0.50),0 2px 8px rgba(0,0,0,0.30);--shadow-glow:0 0 24px var(--color-primary-glow)}.theme-toggle{position:relative;width:42px;height:42px;border-radius:12px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.04);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .35s var(--ease-out);overflow:hidden;flex-shrink:0}.theme-toggle:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.14);transform:scale(1.06)}.theme-toggle:active{transform:scale(.95)}.theme-toggle-icon{position:absolute;font-size:18px;transition:all .45s var(--ease-spring)}.theme-toggle-icon.sun{opacity:0;transform:rotate(90deg) scale(.5)}.theme-toggle-icon.moon,[data-theme=dark] .theme-toggle-icon.sun{opacity:1;transform:rotate(0deg) scale(1)}[data-theme=dark] .theme-toggle-icon.moon{opacity:0;transform:rotate(-90deg) scale(.5)}[data-theme=dark] .theme-toggle{border-color:rgba(245,128,47,.15);background:rgba(245,128,47,.06)}[data-theme=dark] .theme-toggle:hover{background:rgba(245,128,47,.12);border-color:rgba(245,128,47,.25);box-shadow:0 0 16px rgba(245,128,47,.1)}html{transition:background-color .4s var(--ease-out),color .4s var(--ease-out)}.conversation-item,.email-item,.filter-bar,.glass,.main-content,.message-input-bar,.page-header,.sidebar,.split-detail,.split-list{transition:background-color .35s var(--ease-out),border-color .35s var(--ease-out),box-shadow .35s var(--ease-out),color .35s var(--ease-out)}*,:after,:before{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;font-family:DM Sans,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.5}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-divider);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--color-text-tertiary)}.app-layout,.sidebar{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--color-sidebar);flex-direction:column;padding:var(--space-lg) var(--space-md);position:relative;z-index:10;flex-shrink:0}.sidebar:before{content:"";position:absolute;top:0;left:0;right:0;height:180px;background:linear-gradient(180deg,rgba(245,128,47,.06),transparent);pointer-events:none}.sidebar-logo{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);margin-bottom:var(--space-xl);position:relative;z-index:1}.sidebar-logo-icon{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center;color:white;font-size:18px;font-weight:800;box-shadow:0 4px 16px var(--color-primary-glow);flex-shrink:0}.sidebar-logo-text{font-size:19px;font-weight:700;color:var(--color-text-inverse);letter-spacing:-.3px}.sidebar-nav{flex-direction:column;gap:2px;z-index:1}.nav-item,.sidebar-nav{display:flex;position:relative}.nav-item{align-items:center;gap:14px;padding:11px 14px;border-radius:var(--radius-md);cursor:pointer;transition:all .2s var(--ease-out);text-decoration:none;color:var(--color-text-sidebar);font-weight:500;font-size:14px}.nav-item:hover{background:var(--color-sidebar-hover);color:var(--color-text-inverse)}.nav-item.active{background:var(--color-sidebar-active);color:var(--color-primary);font-weight:600}.nav-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:20px;background:var(--color-primary);border-radius:0 3px 3px 0}.nav-item-icon{width:22px;height:22px;font-size:18px}.nav-item-badge,.nav-item-icon{display:flex;align-items:center;justify-content:center}.nav-item-badge{margin-left:auto;background:var(--color-primary);color:white;font-size:11px;font-weight:700;min-width:20px;height:20px;border-radius:var(--radius-full);padding:0 6px}.main-content{flex:1 1;display:flex;flex-direction:column;overflow:hidden;background:var(--color-bg)}.page-header{padding:var(--space-lg) var(--space-xl) var(--space-md);background:var(--color-surface);border-bottom:1px solid var(--color-border)}.page-title{font-size:24px;font-weight:800;color:var(--color-text);letter-spacing:-.5px}.page-subtitle{font-size:14px;color:var(--color-text-secondary);margin-top:2px}.page-body{flex:1 1;overflow-y:auto;padding:var(--space-lg) var(--space-xl)}.glass{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);transition:all .2s var(--ease-out)}.glass:hover{box-shadow:var(--shadow-lg)}.split-view{display:flex;flex:1 1;overflow:hidden}.split-list{width:380px;border-right:1px solid var(--color-border);overflow-y:auto;background:var(--color-surface);flex-shrink:0}.split-detail{flex:1 1;display:flex;flex-direction:column;background:var(--color-bg)}.conversation-item{display:flex;align-items:center;gap:14px;padding:14px 20px;cursor:pointer;transition:background .15s var(--ease-out);border-bottom:1px solid var(--color-border)}.conversation-item:hover{background:rgba(245,128,47,.03)}.conversation-item.active{background:var(--color-primary-soft);border-left:3px solid var(--color-primary)}.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center;color:white;font-weight:700;font-size:15px;flex-shrink:0}.avatar.group{background:linear-gradient(135deg,#6366F1,#8B5CF6)}.conversation-content{flex:1 1;min-width:0}.conversation-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:3px}.conversation-name{font-weight:500;font-size:14px;color:var(--color-text)}.conversation-name.unread{font-weight:700}.conversation-time{font-size:12px;color:var(--color-text-tertiary);flex-shrink:0}.conversation-preview{font-size:13px;color:var(--color-text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conversation-preview.unread{color:var(--color-text-secondary);font-weight:500}.unread-badge{background:var(--color-primary);color:white;font-size:11px;font-weight:700;min-width:20px;height:20px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;padding:0 5px;margin-left:8px;flex-shrink:0}.chat-area{flex:1 1;overflow-y:auto;padding:var(--space-lg);display:flex;flex-direction:column;gap:6px}.message-bubble{max-width:62%;padding:11px 16px;border-radius:18px;font-size:14px;line-height:1.55}.message-bubble.sent{align-self:flex-end;background:var(--color-primary);color:white;border-bottom-right-radius:4px;box-shadow:0 2px 8px var(--color-primary-glow)}.message-bubble.received{align-self:flex-start;background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border);border-bottom-left-radius:4px}.message-meta{display:flex;align-items:center;justify-content:flex-end;gap:6px;margin-top:3px;font-size:11px;opacity:.65}.message-input-bar{display:flex;align-items:flex-end;gap:12px;padding:var(--space-md) var(--space-lg);background:var(--color-surface);border-top:1px solid var(--color-border)}.message-input{flex:1 1;padding:12px 18px;border-radius:var(--radius-full);border:1px solid var(--color-divider);background:var(--color-bg);font-size:14px;font-family:inherit;outline:none;resize:none;max-height:120px;transition:border-color .2s}.message-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-soft)}.send-btn{width:42px;height:42px;border-radius:50%;border:none;background:var(--color-primary);color:white;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:17px;transition:all .2s var(--ease-out);flex-shrink:0}.send-btn:hover{background:var(--color-primary-hover);transform:scale(1.06);box-shadow:var(--shadow-glow)}.send-btn:disabled{background:var(--color-divider);cursor:default;transform:none;box-shadow:none}.filter-bar{display:flex;gap:6px;padding:12px 20px;border-bottom:1px solid var(--color-border)}.filter-btn{padding:6px 16px;border-radius:var(--radius-full);border:none;font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;transition:all .2s var(--ease-out);background:transparent;color:var(--color-text-tertiary)}.filter-btn:hover{background:var(--color-primary-soft);color:var(--color-primary)}.filter-btn.active{background:var(--color-primary);color:white;box-shadow:0 2px 8px var(--color-primary-glow)}.email-item{display:flex;align-items:flex-start;gap:14px;padding:16px var(--space-lg);cursor:pointer;transition:background .15s;border-bottom:1px solid var(--color-border)}.email-item:hover{background:rgba(245,128,47,.03)}.email-item.unread .email-sender,.email-item.unread .email-subject{font-weight:700}.email-sender,.email-subject{font-size:14px;color:var(--color-text)}.email-subject{margin-top:2px}.email-snippet{font-size:13px;margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.email-snippet,.email-time{color:var(--color-text-tertiary)}.email-time{font-size:12px;flex-shrink:0}.star-btn{background:none;border:none;cursor:pointer;font-size:17px;color:var(--color-divider);padding:4px;transition:color .2s}.star-btn.active,.star-btn:hover{color:var(--color-accent)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1 1;padding:80px 40px;gap:var(--space-md)}.empty-state-icon{font-size:48px;opacity:.3}.empty-state-text{font-size:15px;color:var(--color-text-tertiary)}@media (max-width:768px){.sidebar{width:64px;padding:var(--space-md) var(--space-sm)}.nav-item span:not(.nav-item-icon),.nav-item-badge,.sidebar-logo-text{display:none}.nav-item{justify-content:center;padding:12px}.split-list{width:100%}.split-detail{display:none}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}