@import"https://fonts.googleapis.com/css2?family=IBM+Plex+Serif:ital,wght@0,400;0,700;1,400&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap";:root{--color-primary: #8B5A2B;--color-primary-hover: #74491F;--color-primary-light: rgba(139, 90, 43, .1);--color-bg: #FAF8F5;--color-bg-card: #FFFFFF;--color-bg-muted: #FDFCFB;--color-bg-dark: #2D2A26;--color-bg-unread: #FFFDFB;--color-border: #E8E4DE;--color-border-hover: #D4CFC7;--color-border-focus: #8B5A2B;--color-text: #2D2A26;--color-text-secondary: #5C5751;--color-text-muted: #8C8680;--color-text-inverse: #FAF8F5;--color-success: #A8BBA0;--color-warning: #D4A574;--color-error: #C9877A;--color-unread: #8B5A2B;--font-serif: "IBM Plex Serif", Georgia, serif;--font-sans: "IBM Plex Sans", system-ui, sans-serif;--font-mono: "IBM Plex Mono", monospace;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--radius-xl: 12px;--transition-fast: .18s ease;--transition-normal: .3s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--color-bg);color:var(--color-text);line-height:1.6;min-height:100vh}h1,h2,h3,h4,h5,h6{font-family:var(--font-serif);font-weight:400;line-height:1.2;letter-spacing:-.02em}h1{font-size:clamp(2rem,4vw,3rem)}h2{font-size:clamp(1.5rem,3vw,2rem)}h3{font-size:1.25rem}p{margin-bottom:1rem}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}::selection{background:var(--color-primary-light)}:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}.skip-link{position:absolute;top:-40px;left:0;background:var(--color-primary);color:var(--color-text-inverse);padding:8px 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var(--color-border)}.header-logo{display:flex;align-items:center;gap:var(--space-sm)}.header-nav{display:flex;align-items:center;gap:var(--space-lg)}.header-logo__text{font-size:1.35rem;font-weight:700;letter-spacing:-.01em;color:var(--color-text);font-family:var(--font-serif)}.header-user{display:flex;align-items:center;gap:var(--space-md)}.header-user__name{font-size:.9rem;color:var(--color-text-secondary)}.header-user__signout{color:var(--color-text-muted)}.nav-link{font-size:.95rem;color:var(--color-text-secondary);transition:color var(--transition-fast)}.nav-link:hover{color:var(--color-primary)}.mailbox-layout{display:flex;flex:1;overflow:hidden}.sidebar{width:220px;min-width:220px;background:var(--color-bg-muted);border-right:1px solid var(--color-border);display:flex;flex-direction:column;padding:var(--space-md)}.email-list-panel{width:380px;min-width:320px;background:var(--color-bg-card);border-right:1px solid var(--color-border);display:flex;flex-direction:column;overflow:hidden}.email-detail-panel{flex:1;background:var(--color-bg-card);overflow-y:auto}.content-wrapper{max-width:1100px;margin:0 auto;padding:0 var(--space-lg)}.content-wrapper--narrow{max-width:680px}.content-wrapper--wide{max-width:950px}.section{padding:var(--space-2xl) 0}.section--hero{padding:var(--space-2xl) 0 var(--space-xl);text-align:center}.grid{display:grid;gap:var(--space-lg)}.grid--2{grid-template-columns:repeat(2,1fr)}.grid--3{grid-template-columns:repeat(3,1fr)}.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.gap-lg{gap:var(--space-lg)}@media(max-width:768px){.sidebar{display:none}.email-list-panel{width:100%;min-width:0}.grid--2,.grid--3{grid-template-columns:1fr}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);font-family:var(--font-sans);font-size:1rem;font-weight:500;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:none}.btn--primary{background:var(--color-primary);color:var(--color-text-inverse)}.btn--primary:hover{background:var(--color-primary-hover);transform:translateY(-2px) scale(1.01)}.btn--primary:active{transform:translateY(1px) scale(.99)}.btn--secondary{background:transparent;color:var(--color-text);border:1.5px solid var(--color-border-hover)}.btn--secondary:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.btn--ghost{background:transparent;color:var(--color-text-secondary);padding:var(--space-sm) var(--space-md)}.btn--ghost:hover{background:var(--color-primary-light);color:var(--color-primary)}.btn--sm{padding:var(--space-sm) 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var(--color-border)}.card__body{padding:var(--space-lg)}.icon-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;background:transparent;color:var(--color-text-secondary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.icon-btn:hover{background:var(--color-primary-light);color:var(--color-primary)}.badge{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 var(--space-sm);font-size:.75rem;font-weight:600;background:var(--color-primary);color:var(--color-text-inverse);border-radius:10px}.badge--muted{background:var(--color-border);color:var(--color-text-secondary)}.divider{height:1px;background:var(--color-border);margin:var(--space-md) 0}.spinner{width:20px;height:20px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes 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ease-out}.animate-slide-in-right{animation:slideInRight .3s ease-out}.skeleton{background:linear-gradient(90deg,var(--color-border) 25%,var(--color-bg-muted) 50%,var(--color-border) 75%);background-size:200% 100%;animation:skeleton-loading 1.5s infinite;border-radius:var(--radius-sm)}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton--text{height:1em;width:100%}.skeleton--text-sm{height:.875em;width:60%}.skeleton--circle{width:40px;height:40px;border-radius:50%}.skeleton--icon{width:20px;height:20px;border-radius:var(--radius-sm)}.skeleton-stagger>*:nth-child(1){animation-delay:0ms}.skeleton-stagger>*:nth-child(2){animation-delay:.1s}.skeleton-stagger>*:nth-child(3){animation-delay:.2s}.skeleton-stagger>*:nth-child(4){animation-delay:.3s}@media(prefers-reduced-motion:reduce){.animate-fade-in,.animate-slide-up,.animate-slide-in-right{animation:none}.skeleton{animation:none;background:var(--color-border)}}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-lg);background:var(--color-bg)}.auth-card{width:100%;max-width:420px;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-xl);box-shadow:0 8px 40px #2d2a2614}.auth-header{text-align:center;margin-bottom:var(--space-xl)}.auth-logo{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);margin-bottom:var(--space-lg)}.auth-logo__icon{width:40px;height:40px}.auth-logo__text{font-family:var(--font-serif);font-size:1.5rem;font-weight:700;color:var(--color-text)}.auth-title{font-family:var(--font-serif);font-size:1.5rem;margin-bottom:var(--space-sm)}.auth-subtitle{color:var(--color-text-secondary);font-size:.95rem}.auth-form{display:flex;flex-direction:column;gap:var(--space-md)}.auth-form__label{display:block;font-size:.875rem;font-weight:500;color:var(--color-text-secondary);margin-bottom:var(--space-xs)}.auth-divider{display:flex;align-items:center;gap:var(--space-md);margin:var(--space-lg) 0;color:var(--color-text-muted);font-size:.875rem}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--color-border)}.auth-oauth{display:flex;flex-direction:column;gap:var(--space-sm)}.auth-oauth-btn{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-md);background:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:.95rem;font-weight:500;color:var(--color-text);cursor:pointer;transition:all var(--transition-fast)}.auth-oauth-btn:hover{background:var(--color-bg-card);border-color:var(--color-border-hover);transform:translateY(-2px) scale(1.01)}.auth-oauth-btn:active{transform:translateY(1px) scale(.99)}.auth-oauth-btn svg{width:20px;height:20px}.auth-error{padding:var(--space-md);background:#c9877a1a;border:1px solid var(--color-error);border-radius:var(--radius-md);color:var(--color-error);font-size:.9rem}.auth-otp{display:flex;justify-content:center;gap:var(--space-sm)}.auth-otp__input{width:48px;height:56px;text-align:center;font-size:1.5rem;font-family:var(--font-mono, "IBM Plex Mono", monospace);font-weight:600;border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg);color:var(--color-primary);transition:border-color var(--transition-fast)}.auth-otp__input:focus{outline:2px solid var(--color-primary);outline-offset:3px}.auth-footer{text-align:center;margin-top:var(--space-lg);padding-top:var(--space-lg);border-top:1px solid var(--color-border);font-size:.875rem;color:var(--color-text-muted)}.auth-link{color:var(--color-primary);font-weight:500}.auth-link:hover{text-decoration:underline}.input--code{text-align:center;letter-spacing:.25em;font-size:1.25rem;font-family:var(--font-mono)}.folder-nav{display:flex;flex-direction:column;gap:var(--space-xs)}.folder-nav__label{font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-muted);font-weight:600;padding:0 var(--space-sm);margin-bottom:var(--space-sm)}.folder-item{display:flex;align-items:center;justify-content:space-between;width:100%;padding:var(--space-sm) var(--space-md);border:none;border-radius:var(--radius-md);font-family:var(--font-sans);font-size:.95rem;color:var(--color-text-secondary);background:transparent;cursor:pointer;transition:background var(--transition-fast),color var(--transition-fast);text-align:left}.folder-item:hover{background:var(--color-bg-card)}.folder-item:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.folder-item--active{background:var(--color-primary);color:var(--color-text-inverse);font-weight:500}.folder-item__name{display:flex;align-items:center;gap:var(--space-sm)}.folder-item__count{font-size:.75rem;padding:2px 8px;border-radius:10px;background:#ffffff40}.folder-item:not(.folder-item--active) .folder-item__count{background:var(--color-border);color:var(--color-text-secondary)}.folder-skeleton{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md)}.search-bar{padding:var(--space-md);border-bottom:1px solid var(--color-border)}.search-bar__input-wrapper{position:relative}.search-bar__icon{position:absolute;left:var(--space-md);top:50%;transform:translateY(-50%);color:var(--color-text-muted)}.email-list{flex:1;overflow-y:auto}.email-item{display:flex;flex-direction:column;padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--color-border);cursor:pointer;transition:background var(--transition-fast);border-left:3px solid transparent}.email-item:hover{background:var(--color-bg)}.email-item--unread{background:var(--color-bg-unread, #FFFDFB);border-left-color:var(--color-primary)}.email-item--selected{background:var(--color-primary-light)}.email-item__header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-xs)}.email-item__sender{font-weight:500;font-size:.95rem;color:var(--color-text)}.email-item--unread .email-item__sender{font-weight:600}.email-item__time{font-size:.8rem;color:var(--color-text-muted)}.email-item__subject{font-size:.9rem;color:var(--color-text);margin-bottom:var(--space-xs)}.email-item--unread .email-item__subject{font-weight:500}.email-item__snippet{font-size:.85rem;color:var(--color-text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.email-list__error{display:flex;flex-direction:column;align-items:center;padding:var(--space-xl);text-align:center;color:var(--color-error)}.email-list__error-icon{font-size:2rem;margin-bottom:var(--space-sm)}.email-list__error-title{font-weight:600;margin-bottom:var(--space-xs)}.email-list__error-message{font-size:.875rem;color:var(--color-text-muted)}.demo-banner{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:var(--color-bg-dark);color:var(--color-text-inverse);padding:12px 24px;border-radius:var(--radius-lg);display:flex;align-items:center;gap:var(--space-md);box-shadow:0 4px 20px #00000026;z-index:200}.demo-banner__text{font-size:.875rem}.demo-banner__btn{padding:var(--space-xs) var(--space-md);background:var(--color-primary);color:var(--color-text-inverse);border:none;border-radius:var(--radius-sm);font-size:.875rem;cursor:pointer}.email-detail-panel{flex:1;overflow-y:auto;background:var(--color-bg-card)}.email-detail{padding:var(--space-xl);max-width:800px}.email-detail__header{margin-bottom:var(--space-xl);padding-bottom:var(--space-lg);border-bottom:1px solid var(--color-border)}.email-detail__subject{font-family:var(--font-serif);font-size:1.5rem;font-weight:400;margin-bottom:var(--space-md);color:var(--color-text)}.email-detail__meta{display:flex;justify-content:space-between;align-items:flex-start}.email-detail__sender{display:flex;align-items:center;gap:var(--space-md)}.email-detail__avatar{width:44px;height:44px;border-radius:50%;background:var(--color-primary);color:var(--color-text-inverse);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:1.1rem}.email-detail__sender-name{font-weight:600;margin-bottom:2px}.email-detail__sender-email{font-size:.875rem;color:var(--color-text-secondary)}.email-detail__date{font-size:.875rem;color:var(--color-text-muted)}.email-detail__body{font-size:1rem;line-height:1.8;color:var(--color-text-secondary)}.email-detail__body p{margin-bottom:1rem}.email-detail__body a{color:var(--color-primary);text-decoration:underline;transition:opacity .18s ease}.email-detail__body a:hover{opacity:.8}.email-detail__body a:focus{outline:2px solid var(--color-primary);outline-offset:3px}@media(prefers-reduced-motion:reduce){.email-detail__body a{transition:none}}.email-detail__body blockquote{margin:1rem 0;padding-left:var(--space-md);border-left:3px solid var(--color-border);color:var(--color-text-muted)}.email-detail__actions{display:flex;gap:var(--space-sm);margin-bottom:var(--space-lg)}.email-detail__attachments{margin-top:var(--space-xl);padding-top:var(--space-lg);border-top:1px solid var(--color-border)}.email-detail__attachments-title{font-size:.875rem;font-weight:600;color:var(--color-text-secondary);margin-bottom:var(--space-md)}.attachment-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);background:var(--color-bg);border-radius:var(--radius-md);margin-bottom:var(--space-sm);border:1px solid rgba(255,255,255,.15);transition:transform .18s ease,border-color .18s ease;cursor:pointer}.attachment-item:hover{transform:translateY(-2px) scale(1.01);border-color:#ffffff40}.attachment-item:active{transform:translateY(1px) scale(.99)}.attachment-item:focus{outline:2px solid var(--color-primary);outline-offset:3px}@media(prefers-reduced-motion:reduce){.attachment-item{transition:none}.attachment-item:hover,.attachment-item:active{transform:none}}.attachment-item__name{flex:1;font-size:.875rem}.attachment-item__size{font-size:.75rem;color:var(--color-text-muted)}.compose-btn{width:100%;padding:var(--space-md);margin-bottom:var(--space-lg);font-size:.95rem}.compose-btn__icon{font-size:1.1rem;margin-right:4px}.compose-modal{position:fixed;bottom:var(--space-lg);right:var(--space-lg);width:560px;max-height:70vh;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:0 16px 64px #2d2a2626;display:flex;flex-direction:column;z-index:100}.compose-modal__header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-md) var(--space-lg);background:var(--color-bg-dark);color:var(--color-text-inverse);border-radius:var(--radius-xl) var(--radius-xl) 0 0}.compose-modal__title{font-weight:500}.compose-modal__close{background:none;border:none;color:var(--color-text-inverse);cursor:pointer;opacity:.7}.compose-modal__close:hover{opacity:1}.compose-modal__body{flex:1;display:flex;flex-direction:column;overflow:hidden}.compose-field{display:flex;align-items:center;padding:var(--space-sm) var(--space-lg);border-bottom:1px solid var(--color-border)}.compose-field__label{width:60px;font-size:.875rem;color:var(--color-text-muted)}.compose-field__input{flex:1;border:none;background:transparent;font-size:.95rem;font-family:var(--font-sans);padding:var(--space-sm)}.compose-field__input:focus{outline:none;box-shadow:inset 0 -2px 0 var(--color-primary)}.compose-editor{flex:1;min-height:200px;padding:var(--space-md) var(--space-lg);font-family:var(--font-sans);font-size:.95rem;line-height:1.6;border:none;resize:none}.compose-editor:focus{outline:none;box-shadow:inset 0 0 0 2px var(--color-primary-light)}.compose-error{padding:var(--space-sm) var(--space-lg);background:#c9877a1a;color:var(--color-error);font-size:.875rem;border-top:1px solid var(--color-error)}.compose-modal__footer{display:flex;justify-content:space-between;align-items:center;padding:var(--space-md) var(--space-lg);border-top:1px solid var(--color-border)}.compose-modal__actions{display:flex;gap:var(--space-sm)}@media(max-width:640px){.compose-modal{bottom:0;right:0;left:0;width:100%;max-height:80vh;border-radius:var(--radius-xl) var(--radius-xl) 0 0}}@media(prefers-reduced-motion:reduce){.compose-modal,.compose-modal__close,.compose-field__input,.compose-editor{transition:none!important}}