/* ==========================================================================
   style.css — 會員登入頁面樣式（粉色系主題）
   依賴 variables.css 的設計變數與 base.css 的基礎重置。
   採 mobile-first：基礎樣式適配手機，尺寸變化由 variables.css 斷點控制。
   ========================================================================== */

/* ---------- 全屏背景 + 粉色遮罩 ---------- */
.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(var(--color-overlay-top), var(--color-overlay-bottom)),
    url("../images/bg.jpg") center / cover no-repeat;
}

/* ---------- 頁面佈局：卡片水平垂直置中 ---------- */
.login-page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--page-padding);
}

/* ---------- 登入卡片 ---------- */
.login-card {
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: var(--card-max-width);
  padding: var(--card-padding-y) var(--card-padding-x);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-card);
  box-shadow: 0 16px 48px var(--color-card-shadow);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* 卡片頂部彩虹裝飾條 */
.login-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: var(--gradient-rainbow);
}

.login-card__title {
  font-size: var(--fs-title);
  font-weight: var(--fw-title);
  letter-spacing: 0.08em;
  text-align: center;
  margin-bottom: var(--title-margin-bottom);
  background: linear-gradient(135deg, var(--color-title-from), var(--color-title-to));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 表單 ---------- */
.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--field-gap);
}

.form-field {
  display: flex;
  flex-direction: column;
}

/* 輸入框（含左側圖示） */
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  height: var(--input-height);
  background-color: var(--color-input-bg);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-input);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.input-wrap:focus-within {
  border-color: var(--color-input-border-focus);
  box-shadow: 0 0 0 3px var(--color-input-focus-ring);
}

.input-wrap__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--input-icon-size) + var(--input-padding-x) * 2);
  color: var(--color-input-icon);
  pointer-events: none;
}

.input-wrap__icon svg {
  width: var(--input-icon-size);
  height: var(--input-icon-size);
}

.input-wrap__input {
  flex: 1;
  min-width: 0;
  height: 100%;
  padding-right: var(--input-padding-x);
  font-size: var(--fs-input);
  color: var(--color-text-primary);
  background: transparent;
}

.input-wrap__input::placeholder {
  color: var(--color-placeholder);
}

/* 欄位錯誤提示 */
.form-field__error {
  display: none;
  margin-top: 6px;
  font-size: var(--fs-error);
  color: var(--color-error);
}

.form-field--invalid .form-field__error {
  display: block;
}

.form-field--invalid .input-wrap {
  border-color: var(--color-error);
}

/* ---------- 記住我 checkbox ---------- */
.remember {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  width: fit-content;
}

.remember__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.remember__box {
  flex-shrink: 0;
  width: var(--checkbox-size);
  height: var(--checkbox-size);
  border: 1.5px solid var(--color-text-secondary);
  border-radius: var(--radius-checkbox);
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.remember__input:checked + .remember__box {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.remember__input:checked + .remember__box::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center / 70% no-repeat;
}

.remember__input:focus-visible + .remember__box {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.remember__text {
  font-size: var(--fs-text);
  color: var(--color-text-primary);
}

/* ---------- 按鈕 ---------- */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: var(--btn-height);
  border-radius: var(--radius-btn);
  font-size: var(--fs-btn);
  font-weight: var(--fw-btn);
  letter-spacing: 0.05em;
  transition: box-shadow var(--transition-fast),
              filter var(--transition-fast),
              transform var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

.btn__icon {
  width: var(--btn-icon-size);
  height: var(--btn-icon-size);
  flex-shrink: 0;
}

.btn--primary {
  background-color: var(--color-btn-primary-from);
  background-image: linear-gradient(135deg, var(--color-btn-primary-from), var(--color-btn-primary-to));
  color: var(--color-btn-primary-text);
}

.btn--primary:hover {
  filter: brightness(1.06);
  box-shadow: 0 6px 20px var(--color-btn-primary-shadow);
}

.btn--primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  filter: none;
}

/* ---------- 表單訊息（送出後回饋） ---------- */
.form-message {
  display: none;
  margin-top: -4px;
  font-size: var(--fs-error);
  text-align: center;
}

.form-message--success {
  display: block;
  color: var(--color-success);
}

.form-message--error {
  display: block;
  color: var(--color-error);
}

/* ---------- 小屏高度適配：避免卡片被擠壓 ---------- */
@media (max-height: 640px) {
  .login-page {
    align-items: flex-start;
  }

  .login-card {
    margin: 24px auto;
  }
}

/* ---------- 觸控裝置：移除 hover 態殘留 ---------- */
@media (hover: none) {
  .btn:hover {
    box-shadow: none;
    filter: none;
  }
}