/* style.css — 极简AI 设计令牌 & 组件 */

/* ==============================
   FONTS — 中文字体栈
   ============================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;600;700&family=Noto+Serif+SC:wght@400;600;700&display=swap');

:root {
  --font-body: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Helvetica Neue', sans-serif;
  --font-display: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-resume-serif: 'Noto Serif SC', 'Source Serif 4', 'SimSun', 'STSong', serif;

  /* ==============================
     TYPE SCALE (fluid)
     ============================== */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.2vw, 0.875rem);
  --text-base: clamp(0.875rem, 0.85rem + 0.15vw, 1rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.25rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    4.5rem);
  --text-hero: clamp(2.75rem,  0.5rem  + 6vw,    5.5rem);

  /* ==============================
     4px SPACING SYSTEM
     ============================== */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* ==============================
     RADIUS
     ============================== */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* ==============================
     TRANSITIONS
     ============================== */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  /* ==============================
     CONTENT WIDTHS
     ============================== */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;
}

/* ==============================
   LIGHT MODE (default) — 蓝色主色调
   ============================== */
:root, [data-theme="light"] {
  /* Surfaces */
  --color-bg:               #f8f9fb;
  --color-surface:          #ffffff;
  --color-surface-2:        #f3f4f6;
  --color-surface-offset:   #eef0f3;
  --color-surface-offset-2: #e5e7ec;
  --color-surface-dynamic:  #dde0e6;
  --color-divider:          #d1d5de;
  --color-border:           #c4c9d4;

  /* Text */
  --color-text:             #111827;
  --color-text-muted:       #6b7280;
  --color-text-faint:       #9ca3af;
  --color-text-inverse:     #ffffff;

  /* Primary — Blue */
  --color-primary:          #2563eb;
  --color-primary-hover:    #1d4ed8;
  --color-primary-active:   #1e40af;
  --color-primary-highlight: #dbeafe;
  --color-primary-subtle:   #eff6ff;

  /* Error */
  --color-error:            #dc2626;
  --color-error-hover:      #b91c1c;
  --color-error-highlight:  #fef2f2;

  /* Success */
  --color-success:          #16a34a;
  --color-success-hover:    #15803d;
  --color-success-highlight:#f0fdf4;

  /* Warning */
  --color-warning:          #d97706;
  --color-warning-hover:    #b45309;
  --color-warning-highlight:#fffbeb;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.12);
}

/* ==============================
   DARK MODE
   ============================== */
[data-theme="dark"] {
  --color-bg:               #0f1117;
  --color-surface:          #161822;
  --color-surface-2:        #1c1e2a;
  --color-surface-offset:   #1e2030;
  --color-surface-offset-2: #252838;
  --color-surface-dynamic:  #2c2f40;
  --color-divider:          #2e3148;
  --color-border:           #3b3e55;

  --color-text:             #e5e7eb;
  --color-text-muted:       #9ca3af;
  --color-text-faint:       #6b7280;
  --color-text-inverse:     #111827;

  --color-primary:          #60a5fa;
  --color-primary-hover:    #93bbfd;
  --color-primary-active:   #bfdbfe;
  --color-primary-highlight: #172554;
  --color-primary-subtle:   #0c1a3d;

  --color-error:            #f87171;
  --color-error-hover:      #fca5a5;
  --color-error-highlight:  #2d1515;

  --color-success:          #4ade80;
  --color-success-hover:    #86efac;
  --color-success-highlight:#152d1b;

  --color-warning:          #fbbf24;
  --color-warning-hover:    #fcd34d;
  --color-warning-highlight:#2d2515;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:               #0f1117;
    --color-surface:          #161822;
    --color-surface-2:        #1c1e2a;
    --color-surface-offset:   #1e2030;
    --color-surface-offset-2: #252838;
    --color-surface-dynamic:  #2c2f40;
    --color-divider:          #2e3148;
    --color-border:           #3b3e55;
    --color-text:             #e5e7eb;
    --color-text-muted:       #9ca3af;
    --color-text-faint:       #6b7280;
    --color-text-inverse:     #111827;
    --color-primary:          #60a5fa;
    --color-primary-hover:    #93bbfd;
    --color-primary-active:   #bfdbfe;
    --color-primary-highlight: #172554;
    --color-primary-subtle:   #0c1a3d;
    --color-error:            #f87171;
    --color-error-hover:      #fca5a5;
    --color-error-highlight:  #2d1515;
    --color-success:          #4ade80;
    --color-success-hover:    #86efac;
    --color-success-highlight:#152d1b;
    --color-warning:          #fbbf24;
    --color-warning-hover:    #fcd34d;
    --color-warning-highlight:#2d2515;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.6);
  }
}

/* ==============================
   COMPONENT STYLES
   ============================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  transition: all var(--transition-interactive);
  white-space: nowrap;
  min-height: 40px;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}
.btn-primary:active { background: var(--color-primary-active); }

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-text-faint);
}

.btn-wechat {
  background: #07c160;
  color: white;
  border: none;
  cursor: pointer;
}
.btn-wechat:hover {
  background: #06ad56;
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}
.btn-ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  min-height: 48px;
  border-radius: var(--radius-lg);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

/* Input fields */
.input-group { display: flex; flex-direction: column; gap: var(--space-1); }
.input-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.input, .textarea, select.input {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
}
select.input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: var(--space-8);
}
.input:focus, .textarea:focus, select.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}
.textarea {
  resize: vertical;
  line-height: 1.6;
  min-height: 120px;
}
.input::placeholder, .textarea::placeholder {
  color: var(--color-text-faint);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-divider);
  border: none;
  margin: var(--space-6) 0;
}